Outstanding Invoice Calculator
What you are owed in total, what is overdue, and what is at real risk.
The fewest fields that still make a valid invoice — for a quick one-off bill.
The Simple Invoice Generator strips invoicing back to the fields that genuinely matter — who, whom, what, how much and by when — so a one-off bill takes under a minute, with tax, branding and bank details there only if you ask for them.
Most invoice tools make you fill in twenty fields to bill somebody for one thing. This one is stripped back to the fields an invoice genuinely needs: who is billing, who is being billed, what for, how much, and by when.
Tax, discounts, shipping, branding and bank details are all still there if you turn the panels on, but nothing is switched on to start with. The result is a clean single-page invoice you can print or save as a PDF in well under a minute — which is the right shape for a one-off job, a private sale, a deposit, or the first invoice you have ever sent.
It still counts as a proper invoice: it carries a unique number, both parties, a date, an itemised description and a total, which is the minimum most tax authorities require of a document you can put through your books.
Nothing optional is switched on until you turn it on.
Unique number, both parties, date, description and total — the legal minimum.
Tax, discounts, logo and bank details are one panel away.
No account, no watermark and no export limit.
The whole tool runs in your browser.
An address each is enough. Nothing else is required to start.
One line is fine. Add more if the job had parts worth listing separately.
A number is suggested for you, and the due date follows the terms you pick.
Send it however you like — the tool does not send anything itself.
In most countries: the word "invoice", a unique sequential number, the date, your name and address, the customer’s name and address, a description of what was supplied, and the amount due. Tax-registered businesses must also show their tax number and the tax charged.
Yes. Open the tax panel, set a label and a rate, and the totals recalculate. Nothing you have already typed is lost.
A simple invoice is as valid as a complicated one, provided it carries the required details. Complexity is not what makes an invoice count — completeness is.
Yes. Private sellers often need a receipt rather than a tax invoice; change the document title and leave the tax fields empty.
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Write the first reviewWhat you are owed in total, what is overdue, and what is at real risk.
Validate invoice JSON: syntax errors located, fields and types checked, and the totals recomputed.
Tidy messy line descriptions: casing, whitespace, abbreviations and length.
Work out what a credit or debit note should be when an invoice needs correcting.
Read scanned invoices and get a real .xlsx workbook — one row per invoice, or one per line.
Add or remove VAT at any European rate, with the reverse charge explained.
Application-style invoicing with measured work, variations and retention.
A reusable PDF invoice with your branding and the variable fields left empty.