Invoice Calculator

Compute invoice totals with optional discount, tax, and a late fee. Useful for checking client invoices or drafting your own.

Runs in your browserNo signupFormula shown below

Invoice

$

%

%

%

Amount due

—

from a subtotal of —

After discountTaxLate fee
Discount amount—
After discount—
Tax amount—
Total before late fee—
Late fee amount—

Sales tax nexus and late-fee enforceability vary by jurisdiction and contract.

You might also wantPlan the taxes on this invoice

How we calculate

  • After discount = subtotal × (1 − discount%).
  • Tax = after discount × tax%.
  • Total before late fee = after discount + tax.
  • Late fee = that total × late fee%.
  • Amount due = total before late fee + late fee.

Before you rely on this

Not tax, legal, or financial advice. Sales tax nexus, VAT, and late-fee enforceability vary by jurisdiction and contract. This tool does not determine whether you should charge tax.

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