Function #48: Manage fixed installment payments using Zoho Books

Function #48: Manage fixed installment payments using Zoho Books



Hello everyone, and welcome back to our series!

Businesses offer installment payment options to their customers, particularly for expensive purchases, to ease the financial burden on them. By breaking down the total cost into smaller, more manageable payments, businesses can attract a wider audience who may not be able to afford large upfront payments. This approach not only increases the likelihood of making more sales, but also helps to spread revenue over time, improve cash flow, enhance customer satisfaction and loyalty, and provide a competitive advantage in the market.

We receive numerous requests from our users regarding the handling of these installment scenarios. We heard you loud and clear. Today, we are excited to share a solution that utilizes custom functions to manage installment payments in Zoho Books.

Let's take the example of Mr. John Hector, who wants to buy a 75-inch TV from Zylker Electronics, priced at a hefty $2,300. He is finding it difficult to pay the entire amount upfront. Therefore, Zylker Electronics offers him the option to pay in installments. They mutually decide that John will spread the payment over 5 months, committing to monthly installments of $460 until he settles the entire purchase amount. Let's delve into how this process can be efficiently managed within Zoho Books using custom functions.

Firstly, Zylker Electronics should create a sale invoice of $2,300 in their Zoho Books organization. While creating it, they should input the start date of the installment and the number of installments in two custom fields. For instance, if the sale was made on 01.04.2024 and Mr. John agreed to pay in 5 installments starting on 10.05.2024, the start date should be entered as 10.05.2024, and the number of installments as 5.

Two custom functions will come into play: one to generate the retainer invoices to collect the installment payments and another to apply the retainer payments to the sale invoice.

Based on the number of installments entered the function will determine the amount to be charged as monthly installments.
Installment amount = Total Amount Payable / No of installments = $2300 / 5 = $460.

On the specified start date, the first function will create and send the retainer invoice for the first installment. Once the payment for this installment is recorded, the second function will apply it to the sale invoice, reducing the balance accordingly. The process repeats each month, generating and sending retainer invoices for subsequent installments until all 5 are completed. Each retainer invoice will be for $460 and due on the 10th of every month for 5 consecutive months. As each retainer invoice is paid, the second function will automatically apply it to the sale invoice, thereby recognizing the income.

Prerequisites: 

1. Create a Connection named "zbooks" to successfully execute the scheduler. You can watch the GIF attached below to know how to create the connection.




2. Create a Date-type custom field called "Installment Start Date" for the Invoices. This field will be used to input the starting date for installment payments.



3. Create a Decimal-type custom field called "Number of installments" for the Invoices. Here, you'll specify the agreed-upon number of installments. Using this information and the total invoice amount, the function will determine the monthly installment amount.



4. Create a new Retainer Invoice template with the document title "Installment Payment". Then, copy the template ID (You can get the ID from the URL of the webpage) and substitute it into line 26 of the first function. This ensures that all the retainers sent for collecting installment amounts are correctly labeled.



(1) Custom Function to create Retainer Invoices:

Navigate to Settings -> Automation -> Workflow Actions -> Custom Functions -> +New Custom Function -> Module -> Select Invoice -> Add the function code from this
GitHub Link -> Save. 



(2) Workflow Rule to create Retainer Invoices:

Go to Settings -> Automation -> Workflow Rules -> +New Workflow Rule and set up the workflow rule as shown below:-




In the final step of this workflow rule, associate the custom function you created and then hit Save.

(3) Custom Function to apply installment payments to the sale invoice:

Navigate to Settings -> Automation -> Workflow Actions -> Custom Functions -> +New Custom Function- > Module -> Select Retainer Invoice -> Add the function code from this GitHub Link -> Save. 



(4) Workflow Rule to apply installment payments:

Go to Settings -> Automation -> Workflow Rules -> +New Workflow Rule and set up the workflow rule as shown below:-






In the final step of this workflow rule, associate the custom function you created and then hit Save.

We really hope that today's functions help you streamline the process of handling installments in Zoho Books. If you need any assistance in customizing the functions to better suit your needs, please do not hesitate to contact us at support[at]zohobooks[dot]com. We are always happy to help you. 

Also, for those looking to collect varying percentages of the invoice total as installments, stay tuned! 

Regards,
Shireen Farhana
Zoho Books

    Access your files securely from anywhere







                            Zoho Developer Community





                                                  Use cases

                                                  Make the most of Zoho Desk with the use cases.

                                                   
                                                    

                                                  eBooks

                                                  Download free eBooks and access a range of topics to get deeper insight on successfully using Zoho Desk.

                                                   
                                                    

                                                  Videos

                                                  Watch comprehensive videos on features and other important topics that will help you master Zoho Desk.

                                                   
                                                    

                                                  Webinar

                                                  Sign up for our webinars and learn the Zoho Desk basics, from customization to automation and more

                                                   
                                                    
                                                  • Desk Community Learning Series


                                                  • Meetups


                                                  • Ask the Experts


                                                  • Kbase


                                                  • Resources


                                                  • Glossary


                                                  • Desk Marketplace


                                                  • MVP Corner




                                                            • Sticky Posts

                                                            • Introducing Invoice Consolidation for Offline Subscriptions

                                                              Hello Folks, Glad to announce the feature of Invoice Consolidation for Offline Subscriptions. If you are having multiple subscriptions for your customers, now, you can send a single consolidated invoice for all the Offline Subscriptions that are getting renewed on the same date. Advantage?  Customers will be receiving single invoice instead of multiple invoices upon renewal. Also reduces your efforts in follow-up with your customers for payment collections. For Example: If Customer has Subscription
                                                            • New feature: Create back-dated subscriptions

                                                              Hello from the Zoho Subscriptions team. :)   We’re happy to announce that today marks the launch of a much-awaited feature: creating back-dated subscriptions!   From here on out, whenever you create a new subscription with an activation date that is earlier than the present date, you’ll no longer get an error. Instead, you'll be creating a back-dated subscription. This means that the subscription started at that earlier point in time. The next billing date will be calculated automatically based on
                                                            • Announcement Regarding Notification Emails

                                                              Hello Everyone! This announcement is regarding the admin notification emails which you've been receiving from the email address "support@zohosubscriptions.com". From the 1st of October, 06:00 GMT, the emails with the following subjects will be sent from "no-reply@zohosubscriptions.com". Unable to send invoice for the profile - {profile_name} Unable to process auto payments. If you have set up any filters or workflow in your email account, please add "no-reply@zohosubscriptions.com” and  “support@zohosubscriptions.com”
                                                            • Zoho Subscriptions plugin for WordPress

                                                              Zoho Subscriptions plugin for WordPress allows you to easily embed your plan specific checkout page in an iframe with just a few mouse clicks and without a single line of code. How can WordPress Zoho Subscriptions Plugin boost your productivity? It's now easier to embed Zoho Subscriptions checkout page in your WordPress site. Forget the old method of logging in to Zoho Subscriptions, copying a URL and scripting to make adjustments. All this can be done automatically through this plugin. A great time
                                                            • Indian GST organisation Migration Guide

                                                              With respect to the new GST regime releasing on July 1, 2017in India, Zoho Subscriptions Indian edition is also gearing up to make your business GST Ready. This article focuses on how to get your existing organisation in Zoho Subscriptions to migrate to the new GST regime.    Note:  Any organisation created on or after July 1, 2017 will already be GST ready. You wouldn't have to migrate your organisation. Migrating your existing organisation to support GST To migrate your existing organisation to


                                                            Manage your brands on social media



                                                                  Zoho TeamInbox Resources



                                                                      Zoho CRM Plus Resources

                                                                        Zoho Books Resources


                                                                          Zoho Subscriptions Resources

                                                                            Zoho Projects Resources


                                                                              Zoho Sprints Resources


                                                                                Qntrl Resources


                                                                                  Zoho Creator Resources



                                                                                      Zoho CRM Resources

                                                                                      • CRM Community Learning Series

                                                                                        CRM Community Learning Series


                                                                                      • Kaizen

                                                                                        Kaizen

                                                                                      • Functions

                                                                                        Functions

                                                                                      • Meetups

                                                                                        Meetups

                                                                                      • Kbase

                                                                                        Kbase

                                                                                      • Resources

                                                                                        Resources

                                                                                      • Digest

                                                                                        Digest

                                                                                      • CRM Marketplace

                                                                                        CRM Marketplace

                                                                                      • MVP Corner

                                                                                        MVP Corner







                                                                                          Design. Discuss. Deliver.

                                                                                          Create visually engaging stories with Zoho Show.

                                                                                          Get Started Now


                                                                                            Zoho Show Resources


                                                                                              Zoho Writer Writer

                                                                                              Get Started. Write Away!

                                                                                              Writer is a powerful online word processor, designed for collaborative work.

                                                                                                Zoho CRM コンテンツ






                                                                                                  Nederlandse Hulpbronnen


                                                                                                      ご検討中の方




                                                                                                            • Recent Topics

                                                                                                            • Adding Social Media Buttons to Basic Campaigns

                                                                                                              Hi, I'm quote new to using Zoho Campaigns and I can't work out how to add Social Media Buttons into my basic campaign? In MailChimp there's a button that brings the icons into your campaign for you. I've tried adding the social media icons as 'buttons' in Zoho but it's not looking great. Can anyone help? Thanks!
                                                                                                            • Hide Inactive Social Sign-In Providers from Login Screen

                                                                                                              Hello Zoho Team, We hope you are doing well. Currently, Zoho One allows admins to configure security policies and enable or disable Social Sign-In options for third-party providers such as Apple, Google, Microsoft, LinkedIn, Yahoo, Twitter, Facebook,
                                                                                                            • [Free Webinar] AI Agents in Zoho Creator - Creator Tech Connect

                                                                                                              Hello Everyone! We welcome you all to the upcoming free webinar on the Creator Tech Connect Series. The Creator Tech Connect series is a free monthly webinar that runs for around 45 minutes. It comprises technical sessions in which we delve deep into
                                                                                                            • Download All Attached Files

                                                                                                              It would be extremely useful to have "download-all" functionality for downloading files attached to a task, subtask, comment, forum post or hosted in the "Documents" section etc. We've instructed our users to zip multiple files prior to uploading, but of course they forget all the time. Having to download lots of files one-at-a-time off a comment or task wastes a lot of time.
                                                                                                            • unable to send message reason 554 5.1.8 Email outgoing blocked

                                                                                                              unable to send message reason 554 5.1.8 Email outgoing blocked
                                                                                                            • Ship via Carrier Not Working Since Commerce Update

                                                                                                              Since the recent update to the Commerce platform, I can no longer use the ship via carrier function. It will take me to the address screen and let me verify them but when I go to save and move tot he next screen it will not do anything. This is happening
                                                                                                            • automations: Can I execute a step on a specific date?

                                                                                                              I have created a form in Zoho forms, and created a contacts list. I have also begun setting up an automation with the intention of sending the form to the contact list on a specific date every month (via email) for the entire year (essentially sending
                                                                                                            • Zoho Expense - The ability to add detail to a Trip during booking

                                                                                                              As an admin, I would like the ability to add more detail to the approved Trips. At present a requestor can add flights, accommodation details and suggest their preferences. It would be great if the exact details of the trip could be added either by the
                                                                                                            • Adding Folders in Android App

                                                                                                              Is it possible to create a new email folder within the Zoho Mail Android app?  Or can this only be done from the desktop version of Zoho Mail? Cheers!
                                                                                                            • Schedule Exports for Regular Project Updates

                                                                                                              Tracking project data often means exporting data at regular intervals. Instead of manually exporting data every time, users can schedule exports for Phases, Tasks, and Tasks in Zoho Projects. These exports can be set to run once, daily, weekly, or monthly
                                                                                                            • Question about custom fields using Pivot Tables.

                                                                                                              I have created a pivot table showing annual revenue of a client and how much payment that client is paying my company. Is there a way using pivot table to add an additional field that subtracts those to fields / shows me a percentage of that difference?
                                                                                                            • Request for Light/Dark Mode

                                                                                                              Would love the ability to switch between Light and Dark mode similar to Zoho CRM. https://help.zoho.com/portal/en/community/topic/introducing-dark-mode-light-mode-a-new-look-for-your-crm
                                                                                                            • Signature field is showing black

                                                                                                              Hello, When customer signed the service form, it is showing as below picture Phone model: iPhone 16 Pro We tried delete and install application, but it not solved. This has on phone of a few person. There is any advice to solve this?
                                                                                                            • Journey Email - Ignored Contacts

                                                                                                              I have a journey setup which simply sends a string of emails over time. For some reason I am getting large amounts of the contacts who enter the first email being ignored and I can't find anywhere in reports or audit logs why these contacts are not
                                                                                                            • Involved account types are not applicable when create journals

                                                                                                              { "journal_date": "2016-01-31", "reference_number": "20160131", "notes": "SimplePay Payroll", "line_items": [{ "account_id": "538624000000035003", "description": "Net Pay", "amount": 26690.09, "debit_or_credit": "credit" }, { "account_id": "538624000000000403", "description": "Gross", "amount": 32000, "debit_or_credit": "debit" }, { "account_id": "538624000000000427", "description": "CPP", "amount": 1295.64, "debit_or_credit": "debit" }, { "account_id": "538624000000000376", "description":
                                                                                                            • Zoho Books - Include Payment Terms as a Custom View filter

                                                                                                              It would be great if you could created a custom view based on Payment Terms. This would be really handy for seeing a list of customers who have credit terms. A workaround is not required. I could do something with a creditor checkbox, but it would be
                                                                                                            • How to update changed purchase account of item in invoice

                                                                                                              I have selected the wrong purchase account for various articles and created invoices. I had to adjust the purchase account in the article afterwards, but the old purchase account is still posted in the transaction-journal of the invoice. To adjust the
                                                                                                            • Help - Zoho CRM notification on mobile (IOS/Android)

                                                                                                              Hello Community! Can I get the IOS/Andoid CRM app to notify me of events, calls, etc. due as I can with MANY other apps?   I am running the free Zoho I would like this to be native to the Zoho CRM app. I do not want to write a sep. mobile app
                                                                                                            • Zoho Books Idea - Include another field in Bank Details for Address

                                                                                                              Hi Books team, Currently use the Description field in the Bank Details to store the bank's address. This works fine but it would be great if you could add another field for Bank Address, so that other notes about the bank account could be stored in the
                                                                                                            • a question about the COQL API v8

                                                                                                              When I specify eight or more values in a WHERE IN clause and execute it, an error occurs. Is there a limit to the number of values that can be specified in a WHERE IN clause? ↓Error select * FROM Vendors WHERE (id in (1, 2, 3, 4, 5, 6, 7, 8, 9)) ↓Success
                                                                                                            • Zoho Books Idea - Bank Details Button on Banking

                                                                                                              Hi Books team, Sometimes I'm asked to share bank details with a customer or a colleague. So I go to the Banking Module, find the correct bank account, click Setting > Edit, then copy and paste the bank details. Wouldn't it be great if there was a button
                                                                                                            • JS SDK 8.0 – TypeError: Cannot read properties of undefined (reading 'getCacheStore') with sample code

                                                                                                              Hello Zoho Support Team, I’m integrating the Zoho CRM JavaScript SDK v8.0 and I’m getting the error below when running your official sample. I tested directly from: https://github.com/zoho/zohocrm-javascript-sdk-8.0/blob/main/samples/create_records_sample/create_records.js
                                                                                                            • Function #55: Convert multiple quotes to single SO using Custom Button

                                                                                                              Hello everyone, and welcome back to our series! In Zoho Books, after a quote is accepted by your customer, it can be converted into a sales order or an invoice. Often, a customer might have multiple quotes, and for easier billing or upon the customer's
                                                                                                            • Zoho One - Syncing Merchants and Vendors Between Zoho Expense and Zoho Books

                                                                                                              Hi, I'm exploring the features of Zoho One under the trial subscription and have encountered an issue with syncing Merchant information between Zoho Expense and Zoho Books. While utilizing Zoho Expense to capture receipts, I noticed that when I submit
                                                                                                            • Time based workflow without edit/action

                                                                                                              Hello I need help solving this problem if possible. We have Deals come into the CRM via Live Transfer which have the field properties: Stage = New Channel = Inbound Some of them don't get answered so we want these to automatically go into our Outbound
                                                                                                            • What's New - August 2025 | Zoho Backstage

                                                                                                              Every month, Zoho Backstage grows with you. These updates aren't just features and fixes, they're about making your workday smoother, your events more impactful, and your attendees happier. We’ve listened, learned, and shaped this release to keep things
                                                                                                            • prevent selling expired items

                                                                                                              Hello. I need to make a constraint on expired batch items not to be sold. Is it possible in Zoho Inventory? if so, then how? Thanks for further help.
                                                                                                            • Product details removed during update from other system

                                                                                                              We maintain our product details in an other system. These details are synchronized with Zoho at the end of each day, through an API. This has worked perfectly sofar. But last Monday, all product codes and some other product data have been wiped during
                                                                                                            • Client Customer

                                                                                                              I purchased a customer user license, but we cannot see the project I added in the customer account. I would like to ask for support on what we should do.
                                                                                                            • Add Ability to Use Zoho Finance Tags

                                                                                                              For Zoho Finance (Books and Inventory), the current actions do not allow us to affect the tags associated with the entities in question (customers, vendors, items, etc.). Please consider adding this functionality into the actions.
                                                                                                            • Embeded Signing doesn't work on Safari Browser

                                                                                                              We have implemented Zoho Sign in our website by using embeded signing, It works perfectly on Chrome. But it fails on Safari, We get stuck on Zoho Sign Page during redirection from Zoho Sign to our website after signing the document, Please let us know
                                                                                                            • Dataprep Webhook Limits and Cannot update column with Dataprep

                                                                                                              I have two problems : 1 - I am using Airflow to trigger my pipeline, and when I tested it, it worked fine a couple of times. However, after that, I received an error: {"code":429,"message":"Request rate limited"}. I didn’t send too many requests — maybe
                                                                                                            • Power of Automation :: Automatic removal of project users once the project status is changed.

                                                                                                              A custom function is a software code that can be used to automate a process and this allows you to automate a notification, call a webhook, or perform logic immediately after a workflow rule is triggered. This feature helps to automate complex tasks and
                                                                                                            • New in Zoho Forms: Google reCAPTCHA v3 for smarter spam protection

                                                                                                              Hello form builders, Spam submissions are one of the biggest challenges when you share your forms online. They not only clutter your data but can also waste valuable time. To help you combat this without making life harder for genuine respondents, we’re
                                                                                                            • Project Management Bulletin: August, 2025

                                                                                                              We’ve touched a grand 19 years since we started pioneering project management solutions with Zoho Projects. What started as a simple one-page interface is now a suite of products with Zoho BugTracker, Zoho Sprints, and our new debut Zoho Projects Plus,
                                                                                                            • Zoho Sign and Zoho Workdrive Integration

                                                                                                              Hello, there. I want to know if it's possible to save a signed document from Zoho Sign in an specific folder for each signer in Zoho Workdrive.  For example: If John Doe signs the document in Zoho Sign I want to save it automatically in a folder named
                                                                                                            • Empowered Custom Views: Cross-Module Criteria Now Supported in Zoho CRM

                                                                                                              Hello everyone, We’re excited to introduce cross-module criteria support in custom views! Custom views provide personalized perspectives on your data and that you can save for future use. You can share these views with all users or specific individuals
                                                                                                            • How do you list multiple contacts for a lead?

                                                                                                              My sales team wants to be able to add additional contacts for leads, how do we do that? Is there a different way we should be using the lead / contact functionality? Moderation update (9th September 2025): Our developers have built an extension to achieve
                                                                                                            • Modifying Three Dot Menu Options

                                                                                                              Is there a way to modify the three dot menu options that display in a Report header? They currently display: Show As (List, Calendar, Timeline), Print, Import, Export. I'd like to remove the Show As and Print options, since they aren't applicable for
                                                                                                            • Field Not Updating in FSM Script - Service and Parts module.

                                                                                                              Dear Team, I am reaching out regarding a script I have implemented in Zoho FSM to automate the calculation of the End of Service date based on the End of Sale date in the Service and Parts module. Overview of the script: Fetches the End_of_Sale__C and
                                                                                                            • Next Page