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Invoice Total Calculator

Calculate an invoice total by combining subtotal, discount, tax and shipping to estimate the final amount due.

Your Details

Overview

The Invoice Total Calculator helps you estimate the final amount due on an invoice using a starting subtotal, discount rate, tax rate and any shipping or extra charges. It is useful for checking quotes, preparing invoices and confirming what a customer will pay.

How it works

The calculator first works out the discount amount from the subtotal. It subtracts that discount to get the taxable amount, then applies the tax rate to that discounted amount. Finally, it adds shipping or other fixed charges to estimate the full invoice total.

How to use this calculator

  1. 1Enter the subtotal before discount and tax.
  2. 2Add the discount percentage if one applies.
  3. 3Enter the tax rate for the invoice.
  4. 4Include any shipping or fixed extra charges.
  5. 5Review the final invoice total and the breakdown amounts.

Example Calculation

Subtotal

$1,000

Discount Rate

10%

Tax Rate

8%

Shipping or Extra Charges

$25

Invoice Total

$997.00

For a subtotal of $1,000 with a 10% discount, 8% tax and $25 shipping, the estimated invoice total is $997.00.

Frequently asked questions

What does this invoice total calculator estimate?

It estimates the final amount due on an invoice after applying a percentage discount, tax rate and any shipping or extra charges.

Is tax calculated before or after the discount?

In this calculator, tax is calculated after the discount is deducted from the subtotal.

Can I use this for VAT or sales tax?

Yes. You can enter either a VAT rate or a sales tax rate as long as a single percentage applies to the discounted subtotal.

Does shipping get taxed in this calculator?

No. This version adds shipping after tax. If your local rules tax shipping, the actual invoice total may be different.

Can I use this calculator for quotes as well as invoices?

Yes. It can help you estimate a total for both draft quotes and final invoices where the pricing structure is simple.

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Assumptions and warnings

Assumptions

  • The discount is applied to the subtotal before tax is calculated.
  • Tax is calculated as a single percentage rate on the discounted subtotal.
  • Shipping or extra charges are added after the tax calculation in this calculator.
  • Results are estimates and may differ from your accounting or invoicing system settings.