A negative discount allows you to apply a price increase to a bill without it being visible to the client on the printed invoice.

Setup

First, the feature needs to be enabled: go to Options → Setup → Products, open the Discount tab, and tick the Allow Negative Discount checkbox.

Using a Negative Discount on a Bill

Once enabled, when applying a discount on a bill, simply enter a negative value — for example, -10% instead of 10%. This will increase the total bill by that percentage. The client will not see any reference to this adjustment on their invoice.

Common Use Cases

• Recovering balances that were previously written off
• Applying a silent price adjustment where needed

Discount Schemes

Negative discounts can also be applied within a discount scheme that is already set on a client's account, so they work within your existing discount structure.