A late fee is a penalty, not a loan. Leading regulators forbid charging interest on unpaid fees, charges and taxes — and the case for codifying that everywhere is strong.
Consider a cardholder who misses a payment. A late-payment fee is applied. The next month, that fee is still unpaid, and it is now sitting inside the balance on which the bank calculates interest. So the customer is charged interest on the penalty itself. Do this over several cycles and a modest fee quietly snowballs into a materially larger debt — not because the customer borrowed more, but because charges were allowed to compound on top of charges. This is the mischief that a “no compounding on fees” rule is designed to stop.
The international picture
Several regulators have closed this loophole in explicit terms. The United States, through the Credit CARD Act, prohibited double-cycle billing, the practice of computing finance charges by reaching back into balances from prior cycles — a technique that inflated interest well beyond the customer’s current borrowing. The United Arab Emirates’ Consumer Protection framework goes to the heart of the matter by prohibiting the charging of interest or profit on accrued interest or profit. India’s Reserve Bank is the most direct of all: its Master Direction on credit cards bars the capitalisation of unpaid charges, levies and taxes and the compounding of interest on them.
The common thread is a clean conceptual boundary: the interest-bearing balance should reflect what the customer actually borrowed and spent, not the penalties, service fees and taxes layered on top. Fees are a charge for a breach or a service; they are not principal, and they should not be treated as though the customer had drawn them down as credit.
The transparency gap
Many markets have taken the important first step. Guidance often establishes that credit-card interest is charged on the outstanding amount rather than the full billed amount — a protection that already prevents one category of over-charging — and fee caps constrain the size of the charges themselves.
What frequently is not explicitly codified is the further protection that unpaid fees, charges and taxes must not be folded into the interest-bearing balance and compounded. An outstanding-amount rule governs how interest applies to the balance; it does not, on its face, settle the distinct question of whether a penalty that remains unpaid should itself begin to accrue interest. That is a subtle but consequential gap, because it is exactly where a small charge can grow into a disproportionate one.
The scope for reform
This is a precision fix rather than a structural reform. Good practice points to an explicit provision — naturally housed alongside an interest-on-outstanding rule — establishing that:
- Fees, charges and taxes are not capitalised into the interest- or profit-bearing balance; and
- Interest or profit is not charged on unpaid fees, charges or taxes, following the Indian and UAE model.
For markets with a dual banking system the rule has an added elegance. In Islamic card structures, the objection to compounding charges is not merely a consumer-protection concern but a Shari’ah one — the layering of charge upon charge sits uneasily with the prohibition on riba-like accumulation. A clear no-compounding rule therefore reinforces both conduct standards and the integrity of Islamic product design in a single stroke.
The trade-off here is minimal. No legitimate pricing model depends on charging interest on penalties; issuers recover the cost of late payment through the fee itself, which regulators already permit and cap. What the rule removes is not revenue the bank has earned, but an accretion the customer never agreed to.
Barring interest on unpaid fees is the kind of quiet, technical safeguard that rarely makes headlines but materially changes outcomes for customers who fall behind — precisely the customers a consumer-protection regime exists to shield. Codifying it moves a framework from strong to complete on the treatment of credit-card charges.
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