What it means
When two parties settle only part of a debt or dispute, the payment is made pro tanto. The part that has been paid is treated as discharged, while the balance stays open.
This matters in business because the wording of a payment can change its legal effect. If a creditor accepts an amount as full and final settlement, the debt is closed, but if it is accepted pro tanto, the creditor can still pursue the rest.
The phrase is common in disputes about compensation. For example, when a government takes property and pays an initial amount, the owner may accept it pro tanto, reserving the right to argue for a higher figure in court.
It also appears in insurance and contracts. An insurer may make an interim payment on account of a claim while the full loss is assessed, and the contract may describe the amount as pro tanto payment against the final settlement.
Accountants record partial payments by reducing the receivable or payable by the amount actually settled. The remaining balance continues to appear in the accounts, so the ledger always shows what is still owed.
To avoid disputes, businesses should state in writing how any part payment is to be treated, ideally before the money is banked. A short covering note saying that the payment is on account and not in full settlement protects both sides and avoids later argument about what was agreed.
In practice
Real-world examples.
Example
A landowner receives $2,000,000 from a public authority after part of her land is taken for a road. She accepts the payment pro tanto and continues her claim for a further $600,000 that she believes the land is worth. The court will decide whether she is entitled to the extra amount. In the meantime she can use the first payment to buy replacement land.
Example
A construction firm is owed $900,000 under a contract. The client pays $600,000 and says it disputes the rest. The firm records the cash received and keeps the remaining $300,000 as a receivable while it pursues the matter. It also considers whether part of that balance needs a provision for doubtful debts.
Example
An insurer pays a manufacturer $1,000,000 on account after a factory fire while the full loss is investigated. The letter states that the payment is pro tanto against the final claim. When the loss is agreed at $2,500,000, the manufacturer receives the remaining $1,500,000. The first payment let it restart production without waiting for the final figure.
Formula
Calculation
Remaining claim = original claim - pro tanto payment
Suppose a supplier is owed $500,000 by a customer in financial difficulty. The customer pays $350,000 and the supplier accepts it pro tanto, reserving the right to claim the rest.
Remaining claim = 500,000 - 350,000 = $150,000.
The portion settled is 350,000 / 500,000 = 70%, and the portion still owed is 150,000 / 500,000 = 30%.Case study
Seen in the real world.
Redstone Components is an illustrative, fictional supplier that was owed $400,000 by a distributor. The distributor sent a cheque for $250,000 with a note saying it was full settlement of the account.
The finance manager noticed the note and realised that cashing the cheque might be treated as agreeing to the settlement. She wrote back to the distributor that the company would accept the $250,000 only as a pro tanto payment, leaving $150,000 still owed.
In this illustrative story the distributor disputed this, but because the supplier's reply was written and sent promptly, the firm kept its right to claim the balance. It later recovered $120,000 after negotiation, and the lesson was to be careful with the wording on part payments.
Watch out
Common mistakes.
- Cashing a cheque marked as full settlement without reserving the right to claim the balance.
- Assuming that any part payment keeps the rest of the claim alive, when the way it is accepted can matter.
- Failing to record the remaining balance in the ledger after a part payment, so that the accounts show a debt as cleared when part of it is still owed.
Questions
People also ask.
What does pro tanto mean in plain English?
It means to that extent, so a payment is made or accepted only up to a stated amount and the rest stays open.
Is a pro tanto payment the same as payment on account?
They are very similar, since both reduce a debt without ending it, though pro tanto is used more in legal and compensation settings and stresses that the payment satisfies the claim only to that extent.
How is it different from full and final settlement?
A full and final settlement closes the matter completely, while a pro tanto payment leaves the balance claimable.
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