Invoices with wrong Tax

Invoices with wrong Tax

Hello

I'm using an invoice template from zoho CRM to create invoices for customer. Invoice needs to show Tax however even when I state that tax is 15% zoho adds it to the total instead of realizing the total is inclusive of tax in the product details.
In addition on the the item lines zoho asks again for the tax and when I add the correct % zoho is now calculating the total tax on an amount that already has tax.
There is a screenshot of the amount im talking about. If this is just causing so much trouble isn't there way of eliminating the Tax on the product detail lines and then just having the tax be automatically calculated on the item lines from the total, without it being a double add-on?

As it stand if I were to charge people using zoho crm I would be charging them double for tax