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You can add a discount or a surcharge to a bill with the Adjustment field, and change its VAT with the VAT field. Both sit at the bottom of the bill form, above the Total.

Before you start

Add a discount or a surcharge

  1. In the new bill, scroll down to the Adjustment row.
  2. Choose the type of adjustment: % for a percentage or € (your currency’s symbol) for a fixed amount. If you switch type, the number goes back to 0.
  3. Type the number. With a minus sign in front it’s a discount: -10 takes off 10% or €10. Without a sign it’s a surcharge.
  4. Check the Total: it already includes the adjustment.
Bottom of a bill with the % button numbered 2, the -10 adjustment numbered 3 and the Total numbered 4

A 10% discount on a bill

Then create and send the bill as usual.

Change the VAT on a bill

Each new bill takes the VAT rate from your billing details. If you usually charge the same VAT, change it there: Fill in your billing details. To change it on one bill only:
  1. In the VAT row, delete the percentage and type the new one. For example, 21.
  2. Check the Total: it already includes the VAT.
Bottom of a bill with the VAT at 21% numbered 1 and the Total numbered 2

21% VAT on a bill

How the total is worked out

SmartCookie applies the adjustment first, then works out the VAT on the adjusted amount. For example:
  • 2 sessions at €30: €60.
  • Adjustment of -10%: -€6. That leaves €54.
  • VAT at 21% on €54: €11.34.
  • Total: €65.34.
Your student sees the adjustment and the VAT as separate lines on the payment page. The email only shows the total.

What you can’t do

  • You can’t change the adjustment or the VAT after you create the bill. Cancel it and create a new one: Mark a bill as paid or cancel it.
  • A % adjustment goes from -100 to 100. VAT goes from 0% to 100%.
  • A fixed discount can’t be bigger than what you’re charging on the bill.
  • The total can’t go below your currency’s minimum (€0.50 in euros). If it’s 0 or less, you can’t click Create. If it’s between 0 and the minimum, you’ll see a warning when you click Create.
Last modified on September 30, 2026