In Zoho Invoice, you can send two types of reminders to your customers

I. Manual Reminders

To send a manual reminder:

1. Click the "Invoices" tab and the "All Invoices" page appears.
2. Select the invoice, for which you want to send the reminder.
3. On the "Invoice Details" page which appears, click the "Remind Customer" option which you will find on the right hand side.
4. The "Send Payment Overdue Reminder" page appears, where you can see the reminder mail content.
5. Edit the mail content, if you wish to and click the "Send" button.

II. Automated Reminders

To send automated reminders:

1. Click the "Settings" tab.
2. Click the "Payment Reminders" link under "Payment Settings" and the "Payment Reminders" page appears.
3. On the "Payment Reminders" page, you can select the template for the automated reminder and the number of days after due date when the reminder will be sent by the system.