Invoice subtotal with discount and tax

How to use this calculator

1. Enter unit price. Use the unit shown beside the field.
2. Enter quantity. Use the unit shown beside the field.
3. Enter discount (%). Use the unit shown beside the field.
4. Enter tax rate (%). Use the unit shown beside the field.
5. Select Calculate and review the result. Select Reset to restore the example inputs.

How the calculation works

Unit price*Quantity*(1-Discount (%)/100)*(1+Tax rate (%)/100)

Worked example

Unit price = 50; Quantity = 10; Discount (%) = 10; Tax rate (%) = 20. Result: 540.

Understand your result

Calculate a simple invoice where discount is applied before tax. The result is expressed in the same currency or unit as the monetary inputs.

Assumptions and limitations

Assumes all units share the same price, discount and tax treatment. Results are rounded for display.

Questions about this tool