I sat on that clause for almost a year before I added it.
Not because I didn't know how. Adding a line to an invoice template takes five minutes. I sat on it because I kept picturing the conversation where I'd actually have to bring it up, and every version of that conversation in my head ended with a client quietly deciding I wasn't worth the hassle anymore.
The client who finally pushed me over the edge was a marketing agency I'd worked with for almost two years. Good work, decent rates, the kind of relationship you don't want to mess with. Except twice in six months, my invoice slid to 45 days. Not because they couldn't pay. Their accounting person told me, almost cheerfully, that they "batch vendor payments at the end of the month, sometimes the next month." I was a vendor. I was also apparently optional.
So I added a late fee. 1.5% per month on anything past 30 days, spelled out right on the invoice template, nothing hidden in fine print nobody reads. I didn't send an announcement or a policy update email. I just changed the invoice and figured whoever noticed would notice.
The agency never said a word. Their payments got faster, actually, which felt like proof the delay had never been about cash flow in the first place. It was about priority. I'd been at the bottom of a list, and a late fee moved me up it without anyone having to admit that's what happened.
Here's the part I didn't expect. The first time I actually had to invoke the fee wasn't with them. It was with a much smaller client, someone I'd worked with for maybe three months, on an invoice for less than a thousand dollars. Payment hit day 40 with no response to two follow-ups. I added the fee to the next invoice, a small line item, and sent it without much of a lead-up.
I got an email back within an hour. Apologetic, a little defensive, paid within the day, fee included. And then, a few weeks later, that client quietly stopped booking work with me. No confrontation, no bad review, just a slow fade. I'll never know for sure if the fee did that. Could've been budget, could've been a dozen things that have nothing to do with me. But the timing was close enough that I've thought about it more than I'd like to admit.
That's the trade nobody tells you about when they recommend late fees as some kind of freelancing hack. The fee itself is almost beside the point. What it really does is force a decision you've probably been avoiding: are you willing to lose a client over money you're owed? Because you might. Not always, not even usually in my experience, but sometimes. And if the answer is no, not even once, then the clause on your invoice is just decoration.
I want to be honest about something else too. I didn't enforce this evenly. The agency, the client with more leverage over my income, got a fee that quietly did its job without me ever having to say a word about it. The smaller client got the same fee and a much more direct hit to the relationship. Same policy, wildly different outcomes, and I don't think that's a coincidence. Bigger clients have more to lose by treating a vendor badly and more systems in place that just process a fee without anyone taking it personally. Smaller clients feel it. They notice. It becomes about them, even when it isn't.
Would I recommend it? Mostly yes, with a caveat I didn't expect to have. Put the fee on your invoices. Say the number out loud in your head before you send the first one with it attached, so you're not surprised by what it feels like. And don't assume it works the same way on every client just because the math is identical. A percentage doesn't care about context. People do.
What it actually gave me wasn't extra money. I've collected maybe a few hundred dollars in late fees over the past year, which is nothing. What it gave me was a floor. A number that says, past this point, waiting on me stops being free. I didn't have that before, and I spent a long time pretending I didn't need it.
Does anyone else actually enforce their late fees, or is it more of a deterrent that sits on the invoice and never gets used? I'm curious how many freelancers have a policy versus a practice.
