Invoice discount calculator

A percentage discount scales with the job, which protects you on small work and costs you on large work. A fixed reduction does the opposite. On a 40,000 invoice, '10% off' and '2,000 off' are very different conversations, and clients usually ask for the one that favours them.

Where a discount is a goodwill gesture rather than a pricing decision, a fixed amount reads better on the document. It looks like a specific concession rather than a signal that your list price has slack in it.

A discount normally reduces the taxable amount, which means tax is calculated on the discounted subtotal rather than the original. This calculator shows the discount and the net amount; where tax applies, work from that net figure.

Show the discount as its own line on the invoice rather than quietly lowering a unit price. The client sees the concession you made — which is the entire point of making it — and your records show what the work is actually worth.