Add a late fee if you invoice after the work and your customers regularly pay past the due date. Keep it modest (a flat $25 to $50, or 1 to 1.5 percent a month), put it in writing before the job starts, and check your state's rules, because allowed amounts vary. If most of your customers pay on time and you rely on a few large accounts, a discount for paying early or a deposit up front may protect your cash better than a fee. The rest of this page compares the three structures on one $2,000 invoice, so you can see what each one does.
This is general information, not legal or tax advice. Rules on fees and interest are set by state law and by your contract, so check yours.
Why late fees exist, and when they backfire
A late fee does two things. It tells customers that the due date is real, and it recovers some of the cost of waiting. A slow payer costs you in time (chasing), in credit (you may be paying your own suppliers on 14-day terms) and in risk (the older an invoice, the less likely you collect it).
It backfires when it's a surprise. A customer who sees a fee on an invoice they never agreed to will dispute it, and you'll spend more time arguing about a $40 charge than it was worth. It also backfires when you apply it unevenly: charging a small customer and waiving it for a big one trains everyone to wait for the waiver.
Three structures: flat, percentage, early-pay discount
- Flat fee: a fixed amount once the invoice passes the due date, such as $50. Simple to explain, doesn't grow.
- Monthly percentage: a rate such as 1.5 percent of the unpaid balance for each month or part of a month late. It grows with the debt and with the delay.
- Early-pay discount: a reward instead of a penalty, such as 2 percent off if paid within 10 days. Nobody is charged extra; you just pay for faster cash.
Worked example on a $2,000 invoice
Take a fictional invoice for $2,000, due 15 days after the invoice date. Compare a customer who pays on day 30 (15 days late) and one who pays on day 60 (45 days late). All numbers are illustrative.
| Structure | Pays on day 30 | Pays on day 60 |
|---|---|---|
| No fee | You get $2,000 | You get $2,000 |
| Flat $50 after day 15 | $2,050 | $2,050 (same, however late) |
| 1.5% per month or part month | $2,030 (1 month, $30) | $2,060 (2 months, $60) |
| 2% off if paid in 10 days | $2,000 (the discount does not apply) | $2,000 |
Read the table the way a customer does. The flat fee punishes a 16-day delay and a 46-day delay equally, so there is no reason to hurry after day 16. The percentage rises with time, which gives a reason to pay sooner, but the money is small: $60 on a $2,000 invoice that's 45 days late. The discount costs you $40 only on invoices where the customer takes it. If a customer who would have paid on day 30 now pays on day 10, you've paid $40 to have $1,960 20 days sooner. That's about 2 percent for 20 days, which is expensive money if you don't need the cash, and cheap if the alternative is a credit line.
Check your state's rules and your contract
Rules on late fees and interest differ by state. Some states allow any reasonable charge on business invoices if it's disclosed; others cap interest rates or treat certain charges as penalties; consumer sales and home-improvement jobs often carry extra rules. Whatever you choose, the fee has to be in an agreement or quote the customer accepted, and it needs to be reasonable compared with the cost of the delay. Ask a local attorney or your state's small-business office if you aren't sure. Don't copy a number from a big company's invoice.
Where to state it: quote, agreement, invoice
Put the term in three places, using the same words each time.
- On the quote: "Payment due 15 days from the invoice date. A late fee of 1.5% per month applies to unpaid balances."
- In the agreement, under payment. Our service agreement template has the clause.
- On every invoice, near the total: "Due [date]. Late fee of 1.5% per month after this date."
If the first time the customer reads it is on the invoice, you've lost most of its value. Mention it in conversation too: "Payment's due in 15 days, and there's a small late fee after that, it's in the quote."
Enforcing it without losing the client
You will not enforce every fee. Decide your rule: waive the first late fee for a customer who has always paid on time and says why, enforce it for repeat late payers. When you waive, say so: "I've taken the fee off this time. It applies from now on." Before the fee, send a reminder 3 days before the due date and one on the day, as in how to follow up on an unpaid invoice, and use how to ask for payment for the wording of the first request. Most late payments are forgotten invoices, not refusals.
A simpler path: deposits and shorter terms
The fee that never needs enforcing is the one that isn't needed. Ask for a deposit before you start (see how to ask for a deposit), send the invoice the day the job ends (see how to send an invoice), and use shorter terms, such as due on receipt for small jobs and net 15 for larger ones. For what a long term costs you, see payment terms net 30. A customer who has paid 50 percent upfront has little reason to be 45 days late on the rest. More ideas are in how to get paid faster.
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