# Discount on invoices

With Zervant you can easily add a discount on invoices for your customers. The following article describes how you can set up your discounts and how discounts are calculated.

## How to add a discount

1. Go to the tab >Invoices and create a >New invoice

2. Check the box >Discount on the right panel under the invoicing >Settings

3. Click on the downward pointing triangle to customise your discount settings for your invoice:

• Discount based on: decide whether the discount is calculated for the whole invoice or a certain product/service
• Discount type: offer your discount as percentage (%) or specific amount
• Discount calculation: select whether the discount is incl. or excl. VAT ## Discount calculations

The following example values are used to explain the calculations for our discounts:

VAT = 20% (0,2)
Discount percentage = 10% / Total Discount = 20€
Unit Price = 100€
Quantity = 1

How is the discount calculated for:

TOTAL DISCOUNT AMOUNT, incl. VAT?

(Unit Price * Quantity) * (1 + VAT) – Total Discount
(100 * 1) * (1 + 0,2) – 20 = 100

DISCOUNT PERCENTAGE, incl. VAT?

(Unit Price * Quantity) * (1 + VAT) * (1 – (Discount Percentage/100))
(100 * 1) * (1 + 0,2) * (1 – (10/100)) = 108

TOTAL DISCOUNT AMOUNT, excl. VAT?

((Unit Price * Quantity) – Total Discount) * (1 + VAT)
((100 * 1) – 20) * (1 + 0,2) = 96

DISCOUNT PERCENTAGE, excl. VAT?

(Unit Price * Quantity) * (1 – (Discount Percentage/100)) * (1 + VAT)
(100 * 1) * (1 – (10 / 100)) * (1 + 0,2) = 108