What’s a fair late fee?

A fair late fee is usually 1–2% of the outstanding balance per month, or a modest flat charge like a fixed dollar amount after a short grace period. The key isn’t the number — it’s that you state it in your payment terms before you send the invoice, so a late client is never surprised. Rules on interest and late fees vary by location, so check with an accountant or lawyer if you bill across regions.

What clients actually accept

Most freelancers land in one of two camps, and both are reasonable:

• A percentage of the balance — typically 1–2% per month on the unpaid amount. This scales fairly: a small invoice carries a small fee, a large one carries more.
• A modest flat fee — a single fixed charge once the invoice tips past due. Simple to explain, and clients rarely argue with a round, reasonable number.

Two things make a late fee land well. First, give a short grace period — a few days past the due date — before anything applies. Second, write it down where the client can see it. A late fee that lives only in your head isn’t a policy; it’s a surprise, and surprises damage the relationship you’re trying to keep.

Tip: Frame the late fee as the exception, not the plan. A line like “Invoices unpaid after 30 days may carry a 1.5% monthly charge” reads as professional boundary-setting, not a threat. Most clients will simply pay on time to avoid it — which is the whole point.

State it up front in your terms

The safest, friendliest late fee is the one your client already agreed to. In Fee-Lion, set your standard wording once so it rides along on every invoice automatically.

1. Open Settings → Preferences and find your payment terms.
2. Set your default net term (for example, due in 14 or 30 days) so “late” has a clear meaning.
3. Add a short note describing your late-fee policy — the percentage or flat amount, and the grace period — so it appears in the terms area clients see on the invoice and in the portal.
4. Save. New estimates and invoices now inherit the policy without you retyping it.

Because your terms travel into the client portal, the policy is visible at the moment a client reviews and pays — not buried in a forgotten email thread.

Adding a late-fee surcharge when an invoice runs over

When an invoice genuinely goes past due and you decide to apply the fee, add it as a surcharge line rather than editing the original amount. This keeps the history clean: the client can see the base balance and the fee as separate, honest lines.

1. Open the overdue invoice from Invoices in the left sidebar.
2. Add a line and choose a surcharge — label it clearly, like “Late fee (1.5% of balance).”
3. Enter the amount, save, and the new total flows through to the client’s Pay button in the portal.

Surcharges work the same way on estimates, so if you’re quoting fresh work for a slow payer you can build expectations in from the start.

Let reminders do the nudging first

Often you won’t need the fee at all — a timely nudge gets you paid. Send a payment reminder from the invoice before reaching for a surcharge, and keep an eye on your invoice aging report so nothing drifts unnoticed. A polite reminder on day three beats a late fee on day thirty almost every time.

What’s next

• Set your default payment terms
• Send a payment reminder for a late invoice
• Add discounts and surcharges to an estimate
• Stay ahead of aging