Late Fee on a $750 Invoice, 30 Days Overdue
Interest at 1.5% a month
$11.25
1.5% a month, simple interest charged pro rata by day, with no flat fee added.
How that number is worked out
These are the figures this page was built with and every line the calculator produces from them. Change anything above and all of it moves.
- Unpaid invoice amount750 $
- Late fee rate you wrote in the contract1.5 % per month
- Days past due30
- Flat fee, if your contract has one0 $
Now owed$761.25
| Original invoice | $750.00 |
|---|---|
| Days late | 30 (1 months) |
| Interest at 1.5% a month | $11.25 |
| Flat fee | $0.00 |
| Total now due | $761.25 |
| Annual rate this equals | 18% |
| Per day from here | $0.38 |
Days past due compared
Interest is simple and pro rata by day, so it climbs in a straight line rather than accelerating.
| Days past due | Now owed | Total now due |
|---|---|---|
| 30 days | $761.25 | $761.25 |
| 60 days | $772.50 | $772.50 |
| 90 days | $783.75 | $783.75 |
| 120 days | $795.00 | $795.00 |
What else matters here
A $750 invoice 30 days late carries $11.25, so $761.25 is due and it grows about 38 cents a day. Add a $25 flat fee where the contract allows one and the total is $786.25.
What collects money at this size is not the fee, it is a reminder schedule that runs whether or not anyone feels like making the call. Something simple: a statement the day after it goes past due, a short email at day seven, a phone call at day fourteen, a formal notice with the interest calculated at day thirty.
The schedule matters because it is consistent and unemotional. One angry call at day sixty is worse in every way than four calm contacts in the first month, and a customer who knows your reminders arrive like clockwork moves your invoice up the pile without being asked twice.
What this calculator assumes
- A late fee is only collectable if it was in the contract or on the invoice before the invoice went late. A fee that first appears in a reminder email is not enforceable anywhere.
- 1.5 percent a month is 18 percent a year and is the common trade figure, but states cap this. Several cap it below 18 for consumer work, and a rate over the cap can void the whole fee clause, not just the excess.
- Interest here is simple, charged pro rata by day. Compounding monthly is legal in some states and not others, so the simple figure is the safe one to put on paper.
Questions people ask
What is the late fee on a $750 invoice at 30 days?
$11.25 at 1.5 percent a month, for a total of $761.25 and 38 cents a day after that.
When should I start chasing an overdue invoice?
The day after it goes past due, with a statement. Then day seven, day fourteen and day thirty, on a fixed schedule rather than when it occurs to you.
Can I charge a late fee if it was not in the contract?
No. A late fee is only collectable if it was in the contract or printed on the invoice before that invoice went late. A fee that first appears in a reminder email is not enforceable anywhere, however overdue the money is.
The late fee calculator takes any dimensions you like and hands back the same list.