Customer disputes the late fees

The scenario

The principal is paid, or about to be, but the customer baulks at the late-payment fee or interest you've added: "We're not paying that — we never agreed to extra charges." Now you're arguing over the fee, not the debt. The question is whether the charge was properly part of your terms, applied correctly, and worth pressing.

Late-fee disputes are often more about relationship and proportion than principle. The fee may be perfectly valid, yet insisting on a small charge can cost a good customer. Knowing when to hold and when to waive is the real skill.

What's really going on

First, was the fee ever agreed? A late-payment fee or interest charge generally needs to be in your terms of trade and accepted by the customer to be properly chargeable. If it was clearly set out in the credit application or terms they signed, you're on solid ground; if it appeared for the first time on the overdue invoice, far less so.

Second, was it applied correctly — the right rate, from the right date, on the right amount? And third, even if it's valid, is enforcing it worth it? A customer paying a long-overdue principal may dig in over the fee out of pride. Sometimes the commercial answer is to collect the principal, secure the relationship, and treat the fee as a lever rather than a hill to die on.

Your options

You have room to manoeuvre here:

• Confirm the basis. Check the fee is in your accepted terms and was calculated correctly before defending it.
• Hold the fee. Where it's properly agreed and the customer can pay, stand on the terms and ask for it.
• Waive strategically. Offer to drop or reduce the fee in exchange for immediate payment of the principal — a common, effective trade.
• Separate principal from fee. Collect the undisputed principal now and resolve the fee question on its own.

Recommended approach

Check your footing first: confirm the fee is in the terms the customer accepted and that the figure is right. If both hold, you can fairly ask for it — but weigh the relationship. A powerful, frequent move is the conditional waiver: "If the full principal is in our account by [date], I'm happy to waive the late fee this time." This collects the real money fast, rewards prompt settlement, and preserves goodwill, while keeping the fee available as leverage rather than a fight.

Always separate the principal from the fee. Never let a dispute over a modest charge hold up payment of the substantive debt — collect the principal now and argue the fee, if at all, afterwards. Where the fee wasn't properly in your terms, don't press it; instead, learn the lesson and make late fees explicit in your trading terms going forward. For the principle, see our note on charging interest on overdue accounts.

What to avoid

Don't charge a late fee that was never in your accepted terms — applying one that the customer didn't agree to is hard to defend and erodes trust. Don't let the fee dispute hold the principal hostage; the substantive debt should be paid regardless of how the fee shakes out. Avoid digging in on a small charge with a valuable customer when a strategic waiver would secure both the money and the relationship. And don't waive reflexively either — give it away as a deliberate trade for prompt payment, not as a habit that teaches customers fees never stick.