Invoice Calculator
Work out an invoice total with discount, tax and shipping.
Before you send an invoice it helps to double-check the math. This invoice calculator multiplies your quantity or hours by your rate, subtracts any discount, adds sales tax on the discounted amount and includes shipping or other fees.
When the numbers look right, open the free invoice generator to add your logo and client details and download a professional PDF.
Formula
Subtotal = Quantity × Unit priceDiscount = Subtotal × Discount %Tax = (Subtotal − Discount) × Tax rateTotal = Subtotal − Discount + Tax + Shipping
Example
10 hours at $85 = $850. A 0% discount and 8% tax adds $68, for an invoice total of $918.
Frequently asked questions
Is tax calculated before or after the discount?
Discounts are normally applied first and tax is charged on the reduced price. Check your local rules if a discount is offered by a third party, such as a manufacturer coupon.
Should shipping be taxed?
It depends on the jurisdiction. Many US states tax shipping when the goods are taxable; others do not. In our invoice generator you can add shipping as a separate, untaxed line or as a taxable line item.
Can I calculate invoices with several line items?
Yes — the invoice generator handles unlimited line items, per-line taxes and discounts and totals everything automatically.