Quote-to-invoice converter
Calculate the balance to invoice after an accepted quote and deposit.
Rates checked:
Who should use this calculator
This free calculator is intended for freelancers, sole traders, contractors and small-business owners who need a quick planning figure before preparing or checking an invoice. It can also help clients and bookkeepers understand the arithmetic behind a quoted amount. Use the result as a review aid alongside the relevant agreement, source records and current official guidance, not as an automatic accounting or legal decision.
Calculator methodology
Invoice balance equals the accepted quote total minus the deposit already paid.
This is general information, not tax, legal or accounting advice.
Worked example
A client accepts a £2,400 quote and pays a £600 deposit. The remaining balance is £1,800. The final invoice should identify the accepted scope, show the original amount and deposit clearly, and explain any approved changes rather than presenting £1,800 as an unexplained standalone charge.
Important limitations
This calculator subtracts one deposit from one quote total. It does not calculate staged invoices, tax points, retention, refunds, multiple currencies, scope changes or deposits already allocated elsewhere. Confirm that the quote was accepted, the deposit cleared and both figures use the same tax and currency basis before creating the invoice.
Match the accepted quote reference, deposit receipt and final invoice in your records. Carry the original description and agreed currency onto the invoice, then show the deposit as a separate credit line. This lets the client reconcile the balance and prevents the same deposit being deducted twice.
Common questions
Does Billoz store my calculator entries?
No. These public calculations run in the browser and are not saved to a Billoz account.
Is the result professional advice?
No. It is an indicative calculation based on the values entered and the displayed method.
Should I keep a record of the calculation?
For an important decision, retain the inputs, result, source and calculation date with the relevant invoice or business record.