What due date means
A due date is the moment an obligation becomes enforceable.
Before it, nothing is owed and nothing can be demanded. After it, the payer is in default, interest may run if the contract provides for it, and the cause of action for suing generally accrues, which is when the limitation clock starts.
The date should be defined, not implied. Payable within thirty days is a term. Payable on receipt of invoice is a term. Payment on completion is a term, provided completion is defined. Silence is not, and where a contract says nothing, payment is generally due within a reasonable time, which is an invitation to argue.
The date also has to be measured from something identifiable. Thirty days from what? From the invoice date, from receipt of the invoice, from delivery, or from acceptance. Each produces a different answer, and the difference is often a fortnight.
How it is used
For any business selling on credit, payment terms are a working capital decision rather than a legal one.
The common structures are simple. Payment in advance, which suits new customers and small orders. A deposit with the balance on delivery, which shares the risk. Net terms of a stated number of days from invoice, which is the standard business to business arrangement. Staged payments against milestones, which suits projects. And retention, where a percentage is held back until a defect period expires.
The clauses that make terms work are the ones around the date. Interest on late payment at a stated rate. A right to suspend further supply while an invoice is overdue. A right to charge recovery costs. A right to require payment in advance for future orders once an account has gone overdue.
Without an express interest clause, a supplier's position on late payment is weaker, and the practical remedy is a demand letter followed by suspension of supply.
Key features
- Fixes when payment or performance becomes enforceable
- Starts the clock for interest, default and the limitation period
- Should be measured from a defined event, not left implied
- Interest on late payment generally requires an express clause
- Suspension rights are often more effective than interest
- Where a contract is silent, payment is due within a reasonable time
How this works in Nigeria
Late payment is a structural problem for Nigerian small businesses, and the legal tools are less useful than the commercial ones.
There is no general statutory right to interest on commercial late payment of the kind some jurisdictions provide. Interest is available where the contract provides for it, and courts can award interest on judgment debts and in some circumstances pre judgment, but a supplier without an interest clause is relying on the court's discretion.
That makes the contract the place to solve it. State the rate, state the period it applies to, and state that recovery costs are payable. Then be willing to invoke it.
Suspension is usually the more effective lever. A right to stop supplying while an invoice is overdue concentrates attention in a way that an interest charge does not, particularly with a customer who depends on continuing supply.
For larger corporate customers, the practical Nigerian reality is that payment runs to internal cycles regardless of your terms. Understanding the customer's payment run, submitting invoices correctly the first time, and confirming receipt in writing does more for cash flow than any clause.
The limitation point matters too. The clock generally runs from the due date, so a supplier who spends three years politely chasing may be closer to the deadline than they realise.
Due date vs payment terms vs credit period
Three related expressions that are not interchangeable.
The due date is the specific date on which payment must be made. It is a point in time.
Payment terms are the arrangement that produces that date, together with everything around it: the trigger event, the number of days, interest on late payment, suspension rights and recovery costs.
The credit period is the commercial reality of how long the customer effectively has your money. It runs from when you incurred the cost to when payment actually arrives, which is usually longer than the stated terms.
A business quoting thirty day terms, invoicing a week after delivery, and being paid two weeks late is extending roughly seven weeks of credit. Working capital planning should use that figure rather than the one on the invoice.
Limits and risks
A due date does not produce money. It produces a right, and a right against a customer with no funds is worth what they can pay.
Interest clauses are also often unenforced in practice, because suppliers do not want to damage a customer relationship over a charge they will probably waive.
Where the contract is silent on interest, the position is weaker, and pre judgment interest is discretionary.
And the limitation period runs quietly from the due date. A debt chased patiently for years without proceedings, and without any written acknowledgement from the debtor, can become statute barred while the supplier is still being reasonable.
Worth knowing
Put an express interest rate and a suspension right in your payment terms, and measure the due date from a defined event such as delivery rather than from the invoice. Nigerian suppliers who leave both to implication are the ones still chasing an invoice from eighteen months ago.
Questions people ask
When does a payment become overdue?
The day after the due date fixed by the contract. Where the contract is silent, payment is generally due within a reasonable time, which is exactly the ambiguity that produces disputes.
Can I charge interest on late payment in Nigeria?
Where your contract provides for it, yes. There is no general statutory right to interest on commercial late payment, so without a clause you are relying on the court's discretion to award interest.
What is the most effective remedy for late payment?
A contractual right to suspend further supply while an invoice is overdue. It concentrates attention far more effectively than an interest charge, particularly with customers who depend on continuing supply.
Should payment terms run from the invoice or from delivery?
Whichever you state, but state it. Thirty days from delivery, from invoice date, from receipt of invoice and from acceptance produce different dates, and the difference is often two weeks of cash flow.
Does the limitation clock run from the due date?
Generally yes. That is when the cause of action accrues, so a supplier chasing patiently for years without proceedings or a written acknowledgement can find the claim becoming statute barred.
How do I improve payment from large customers?
Understand their internal payment run, submit invoices correctly the first time with the purchase order reference, and confirm receipt in writing. That does more for cash flow than any clause in a contract.