Calculator
Invoice Calculator: line items, tax and totals
Build a simple invoice: add line items, apply tax and a discount, watch the totals update. Everything stays on your device.
Runs 100% in your browser. No signup, no uploads.
Invoice calculator
Add your line items. Everything stays on your device.| Description | Qty | Unit price | Line total | |
|---|---|---|---|---|
£0.00 |
- United Kingdom20%
- Germany19%
- France20%
- Spain21%
- Italy22%
- Netherlands21%
- Austria20%
- Ireland23%
- Portugal23%
- Switzerland8.1%
- Australia10%
- Canada5%
- United Arab Emirates5%
- Saudi Arabia15%
- 0% (no tax)0
- No matches
What this calculator does
Add your line items, pick a tax rate and an optional discount, and the calculator totals everything: subtotal, discount, tax and the final amount. There is no account, no email capture and no file upload. The data stays in the page until you close it.
Each line takes a description, a quantity and a unit price. Line totals update as you type, and the summary column on the right shows the running totals for the whole invoice.
The Copy summary button copies a plain text summary you can paste into an email or your accounting software. For a formatted document, use the totals here and your invoicing tool.
What a VAT invoice needs
Beyond the totals, a compliant VAT invoice carries: your full name and address, your VAT number, the customer's name and address, the issue date and a sequential number, a description of the supply, the net amount, the VAT rate and the VAT amount per rate, and the total payable.
The VAT number is the critical field: without it, your customer cannot reclaim the tax. If you charge more than one rate, list the net and VAT separately per rate. The guide on VAT on invoices walks through a complete example you can copy.
Tax rates on invoices
Pick your country from the tax dropdown and the calculator uses its standard rate, or choose 0% for exports and zero rated supplies. The currency follows the country you pick, so a German invoice totals in euros and a UK one in pounds.
For reduced rates, add the rate as a custom percentage. The calculator does not judge which rate applies; your tax authority decides that, and the guides help you identify the common cases.
Common questions
What should an invoice include?
For a VAT invoice in most countries: your name and address, your VAT number, the customer's name and address, the invoice date and number, a description of the supply, the net amount, the VAT rate and the VAT amount. See the VAT on invoices guide for a full example.
Does this calculator create a real invoice?
No. It calculates the totals. Use it to check your own invoice before sending, or to build the numbers you then format in your invoicing software.
How do I add multiple tax rates to one invoice?
The calculator uses one rate per invoice. If you need two rates, run the standard lines with one rate and the reduced lines with the other, then add the totals together.
Why does the currency change when I pick a country?
Each country preset carries its currency, so the totals format correctly. You can still type any rate manually if you invoice across borders.
How do I calculate an invoice due date?
Add the payment term to the invoice date: a Net 30 invoice issued on 12 August is due on 11 September. Count calendar days unless the contract says business days. For late payment interest, apply your agreed annual rate to the overdue amount per day.
Is a discount before or after tax?
In most regimes the discount is applied to the net amount, and tax is calculated on the discounted net. That is how this calculator works. Confirm the order with your tax authority if you offer discounts.