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Invoice Total Calculator
Add up an invoice properly: lines, discounts, tax, shipping and what is left to pay.
Quick Tool Overview
The Invoice Total Calculator adds an invoice up in the order an auditor expects: line discounts, the whole-invoice discount spread proportionally across the lines, tax per rate, charges, rounding, then payments — with every step shown.
- What it does
- Works out an invoice total correctly
- You give it
- The lines, the discount, the tax and anything paid
- You get back
- The total and every step that produced it
- Best for
- Checking an invoice somebody sent you
About the Invoice Total Calculator
Adding up an invoice is not adding up a column of numbers. The order matters, and getting it wrong produces a total that is right to within a few pence and wrong in a way an auditor will find.
The correct order is: line discounts first, because tax is charged on what you actually charged. Then the whole-invoice discount, spread across the lines in proportion to their value — which matters as soon as there is more than one tax rate, because a flat 10% off a basket of 20% and 5% goods has to reduce both tax bases. Then tax, one rate at a time. Then the charges tax does or does not apply to. Then rounding. Then what has already been paid.
This does exactly that, and shows every step, so you can see where a figure came from rather than having to trust it. Paste the lines from anywhere — a spreadsheet, an email, a quote — and it reads them.
Key features of the Invoice Total Calculator
The right order
Discounts, then tax, then charges, then rounding, then payments.
Discount spread proportionally
So every tax base is reduced, on a mixed-rate invoice.
One row per tax rate
Never a blended average, which cannot be reconciled.
Paste from anywhere
A spreadsheet, an email or a quote — the lines are read.
Working shown
So a difference points at a cause rather than a mystery.
How to use the Invoice Total Calculator
-
1
Paste the lines
Description, quantity and price, separated by tabs or commas.
-
2
Add the discount
A percentage or an amount off the whole invoice.
-
3
Set the tax
One rate, or per-line rates if the invoice mixes them.
-
4
Add shipping and anything paid
Deposits and part payments come off at the end.
-
5
Read the working
Every step in order, so the total can be checked rather than trusted.
Frequently asked questions
Line discounts, then the whole-invoice discount spread across the lines, then tax on the reduced amounts, then shipping and other charges, then rounding, then payments already made. That order is what an auditor expects and what makes the arithmetic reproducible.
In proportion to each line’s value, so every tax base is reduced by its share. Taking the discount off the gross total instead is how an invoice ends up a few pence away from what an accounting system expects.
It depends where you are. In the UK and EU, delivery charged with taxable goods usually follows their rate. In the US it varies by state. Enter it as a line item if it must pick up a rate.
Once, at the end, to the number of decimals the currency has — unless your jurisdiction requires line-level rounding, in which case do it there and only there.
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