How to Charge a Late Payment Fee (Without Losing the Client)
Late payment fees explained: how to structure them, what's legally enforceable, and how to communicate them without damaging client relationships.
Why a late fee policy matters even if you never charge one
A stated late fee on your invoice shifts the client's mental model: paying on time becomes the neutral action, paying late becomes an active cost. Most late fees are never actually charged because the policy alone is enough to move the invoice up the AP queue.
How much to charge
The industry norm is 1.5% per month (18% annualized), which is roughly the maximum most jurisdictions allow before it starts to be treated as usury. A flat late fee ($25–$50) works better for small invoices where a percentage would be negligible. Some businesses combine both: 'A late fee of 1.5% per month or $50, whichever is greater.'
What to check before you set the rate
Late fees are regulated. In the US, each state has its own maximum interest rate. In the EU, late payment interest is set by directive at 8% above the ECB reference rate for B2B transactions. In the UK, the statutory rate is 8% plus Bank of England base. Never charge above the local maximum — it makes the entire fee unenforceable.
Where to state the policy
The late fee policy must appear on the invoice itself (not just in the contract) to be enforceable in most jurisdictions. A single line at the bottom is enough: 'A late fee of 1.5% per month will be added to overdue balances.'
When to actually charge it
Almost never in the first 30 days after the due date — the relationship matters more than the fee. If the invoice crosses 45 days overdue, add the fee to the next invoice or issue a new invoice for the accrued interest. If it crosses 90 days, the fee is the least of your problems and it's time to move to formal collections.
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