Late Fees on a Contractor Invoice: How Much, and When They Actually Stick
A charge added to an invoice that was not paid by its due date. It only exists if your contract or your invoice said it would, in writing, before the work was done.
Also called Finance charge, Late payment interest, Service charge on an invoice.
Calculate the late fee on an overdue invoice Enter the amount, the rate and the days late. It gives the fee and the new balance. Free, no signup.What it is and what makes it enforceable
A late fee is a contractual charge, not a legal right. Nothing in the law adds one to your invoice for you. If the contract and the invoice are both silent, the amount owed on day ninety is the same as the amount owed on day one.
Two things have to be true. The term has to have been agreed before the work, which in practice means a clause in the contract or on the accepted estimate, and it has to be stated on the invoice itself so the customer knows the clock is running.
Adding a fee to an invoice after it is already late, when nothing ever mentioned one, is the version that gets ignored and that a court will not enforce.
Why 1.5 percent a month
One and a half percent per month is the figure the construction trades settled on, and it is the number most invoice software defaults to. It works out to 18 percent a year, which sits under the usury ceiling in most states for commercial dealings.
That is the reason for the odd number. It is not a magic rate, it is a rate chosen to stay legal in as many places as possible while still being large enough that paying you is cheaper than ignoring you.
Some states cap it lower, particularly for work done for a consumer rather than a business, and some require specific disclosure wording on the invoice. A rate above the cap does not just fail; in some states the whole interest claim fails with it, so the safe move is to stay conservative.
Percentage per month or a flat fee
Percentage per month is the better structure for construction, because it scales with the size of the invoice and keeps accruing. A flat fee stops mattering the moment the amount outstanding is large, and on a 40,000 dollar progress payment a 25 dollar charge is a rounding error.
Whichever you use, write the grace period into the same sentence. Net 30 with a fee from day 31 is clear. Due on receipt with a fee from an unstated date is an argument.
- State the trigger date, not just the rate: a fee from day 31 after invoice date.
- Say whether it compounds. Simple interest on the original balance is easier to defend and easier to explain.
- Put the same sentence on the contract and on every invoice, worded identically.
- Keep charging it consistently. A fee waived on four invoices and demanded on the fifth is the one that gets disputed.
The fee is leverage, not a collection plan
A late fee gives a customer a reason to move you up the pile and gives you something to trade away in a settlement. What it does not do is collect.
On construction debt the real leverage is the lien right and the deadline attached to it, and that clock runs whether or not you are charging interest. Send the notice of intent to lien on schedule and treat the accumulated late fee as the thing you forgive in exchange for the check clearing this week.
What 1.5 percent a month actually adds
Simple interest on the original balance, which is the version that is easiest to defend.
| Invoice | 30 days late | 60 days late | 90 days late |
|---|---|---|---|
| $1,000 | $15 | $30 | $45 |
| $2,500 | $37.50 | $75 | $112.50 |
| $5,000 | $75 | $150 | $225 |
| $12,000 | $180 | $360 | $540 |
| $25,000 | $375 | $750 | $1,125 |
| $50,000 | $750 | $1,500 | $2,250 |
1.5 percent a month is 18 percent a year. Check your state's cap before using anything higher, and check it separately for consumer work.
La misma explicación, línea por línea, con las palabras en inglés que aparecen en el formulario. Factura y recargo por mora, en español.
What to do with it
Questions people ask
Can I charge a late fee if it is not in the contract?
Generally no. A late fee is a contract term, so if nothing was agreed before the work there is usually nothing to enforce. Some states allow statutory interest on a judgment or under a prompt payment act, but that is a different and usually lower number than the fee you wanted to charge.
What is a normal late fee for a contractor?
One and a half percent per month, which is 18 percent annually, is the common construction figure. One percent per month is the conservative choice and is safer in states with tighter caps, especially on residential work for a homeowner.
Does a late fee hurt my lien rights?
The lien itself normally covers the value of the work and material furnished, and interest or fees are often not lienable even where they are collectible under the contract. That is a reason to keep the fee and the principal on separate lines so the lien amount is clean.
Should I charge a late fee to a repeat customer?
Put the clause in the contract every time and then use judgment about invoking it. The clause costs nothing to include and cannot be added later. Deciding to waive it on a good customer is a choice you can only make if it is there.