Late Invoice Fee Calculator
Calculate the late fee owed on an overdue invoice from the invoice amount, days late and your monthly late-fee rate.
Late fees must be stated in your contract or invoice terms to be enforceable. 1–1.5% per month is the common range for freelancers and small businesses.
Comprehensive Guide & Formulas
Late payment penalties
Key Takeaways & Benchmarks
- ✓Late fee = invoice × monthly rate × (days late ÷ 30).
- ✓1–1.5% per month is the standard freelancer/small-business range.
- ✓Fees must be in the contract upfront to be enforceable.
- ✓The clause's real job is prevention — most clients pay to avoid it.
- ✓Pausing work is usually stronger leverage than the fee itself.
How late fees work
A late fee is a contractual penalty that compensates you for delayed payment — both the time value of money and the administrative cost of chasing it. It's expressed as a monthly percentage of the overdue amount, prorated for partial months.
The fee only works if it was agreed before the invoice existed. Courts and common sense both treat surprise penalties skeptically. The professional move is boring: put the rate in your contract, restate it on every invoice, and then rarely need it — because its existence does most of the work.
- 1Enter the invoice amount
The overdue balance.
- 2Set days overdue
Days past the payment due date.
- 3Set your monthly rate
1–1.5% per month is standard.
- 4Read the fee
Amount owed, total due and daily cost of delay.
The formula
Worked example
$5,000 invoice, 45 days late, 1.5%/month: $5,000 × 1.5% × 1.5 = $112.50 fee, $5,112.50 total due. That's $2.50 per day of delay — small enough to seem harmless, which is exactly why payment terms need teeth.
At 90 days the fee reaches $225. Framed as an 18% effective APR, the client is borrowing from you at credit-card rates — a perspective that tends to accelerate accounts payable.
Getting paid on time
- ▸Put late-fee terms in the contract before work begins, not after.
- ▸Invoice immediately — every day you delay invoicing is a day added to payment.
- ▸Send polite reminders at 7 and 14 days overdue; firm ones at 30.
- ▸Pause ongoing work for seriously overdue accounts — it's your best leverage.
- ▸Offer small early-payment discounts (2/10 net 30) if late fees feel too adversarial.
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Frequently asked questions
How do you calculate a late fee on an invoice?+
Multiply the invoice amount by the monthly late-fee rate, prorated by days overdue ÷ 30. A $5,000 invoice 45 days late at 1.5%/month accrues $5,000 × 1.5% × 1.5 = $112.50. This calculator does the prorating and shows the running daily cost of the delay.
What is a typical late fee percentage?+
1–1.5% per month (12–18% APR) is the common range for freelancers and small businesses. Some jurisdictions cap what you can charge — a few US states limit late fees on consumer debts, though B2B contracts have more latitude. Always check local rules before setting your rate.
Can I charge a late fee if it wasn't in the contract?+
Generally no — or at least, not enforceably. Late fees need to be agreed upfront in your contract or stated on the invoice terms the client accepted. Adding a penalty after the fact invites disputes you'll likely lose. Put 1.5%/month and your payment terms in every agreement before work starts.
Should the late fee compound?+
Most small-business late fees are simple (non-compounding) — each month's fee is calculated on the original invoice amount. Compounding is harder to enforce and can look punitive. Keep it simple: state a monthly rate, apply it to the outstanding invoice balance.
What should I do when a client ignores the late fee?+
Escalate in stages: friendly reminder at 7 days, firm reminder citing the contract terms at 14–30 days, then pause current work until the balance clears. For freelancers, stopping work is usually more effective than any fee — future revenue is the leverage. Your rate math from the Freelance Rate Calculator should already price in some payment delay.
How do I write late payment terms?+
Be specific: 'Payment due within 14 days of invoice date (NET 14). Balances unpaid after the due date accrue a late fee of 1.5% per month.' Include it in both the contract and on each invoice. Vague terms like 'prompt payment' are unenforceable.
Is charging a late fee worth the client relationship risk?+
Usually yes — clients who pay late repeatedly are already costing you. In practice, simply having the clause changes behaviour; most clients pay on time to avoid it, and you rarely need to enforce it. The fee's real job is prevention, not collection.
What is the difference between a late fee and interest?+
Functionally little — both compensate you for the time value of money. 'Late fee' is the friendlier contractual term; 'interest' may trigger usury considerations in some jurisdictions. The effective APR shown above lets you compare your fee against market rates for fairness.
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