What Is the Real Interest Rate on a Loan App in Nigeria? How to Convert a 30-Day Fee Into an APR

Nigerian digital lenders almost never quote an annual interest rate. They quote a fee — "10% for 30 days", "5% flat monthly", "₦5,500 to borrow ₦50,000". This isn't necessarily dishonest, but it is incomparable: you cannot hold those numbers up against a bank's advertised 30% per annum and see which is cheaper, because they aren't measured in the same units.

Converting them takes two lines of arithmetic. Once you've done it once, the loan app market looks very different.

The short answer

A 30-day charge of 10% is roughly a 122% annual rate if you never roll it over, and about 219% APR if you keep re-borrowing all year.
"5% flat monthly" is not 60% a year. On a 6-month loan it works out to a true reducing-balance APR of about 96.6%, because flat-rate interest is charged on the full original amount even after you've repaid most of it.
The benchmark you're comparing against is 26.5% — the Central Bank of Nigeria's Monetary Policy Rate, held at that level at the MPC's 306th meeting in July 2026 (CBN monetary policy decisions). Bank personal loans price at a spread above it, typically in the high 20s to low 30s.
Rollovers are where the real damage happens, not the headline fee.

Line one: annualising a 30-day fee

If a lender charges a total of f (as a decimal) for a loan of d days, the simple annualised rate is:

Annualised rate = f × (365 ÷ d)

Borrow ₦50,000 and repay ₦55,000 after 30 days. The charge is 10%, so:

0.10 × (365 ÷ 30) = 1.217 → 121.7% a year

That's the number to write next to a bank's 30%. It is not a trick or an exaggeration — it's the same measurement, on the same scale, which is exactly what the fee quote avoids giving you.

If you re-borrow every 30 days for a full year, the fee compounds and the honest figure is higher:

(1.10)^(365/30) − 1 = 218.9% APR

At a 15% monthly charge — which is within the range some short-tenor lenders operate at — the same maths gives roughly 183% simple and 448% compounded. The gap between those two numbers is entirely about whether you roll the loan over.

Line two: what "flat rate" actually costs

The second quoting convention is the flat rate, and it's the one that catches out borrowers who have done some homework. A flat-rate loan calculates interest once, on the full original principal, and charges it every single month — even in the final month, when you owe almost nothing.

Take ₦100,000 over 6 months at 5% flat per month (a 60% flat annual rate):

Total interest: ₦100,000 × 60% × (6 ÷ 12) = ₦30,000
Total repayment: ₦130,000
Monthly payment: ₦130,000 ÷ 6 = ₦21,666.67

Now solve for the reducing-balance rate that would produce that same ₦21,666.67 monthly payment on ₦100,000 over 6 months. The answer is a monthly rate of about 8.05%, or a true APR of 96.6%.

So the "60% a year" loan is a 96.6% loan. The stated rate understates the real cost by more than a third, and the shorter the term, the wider that gap gets. This is the single most common source of confusion in Nigerian consumer credit, which is why our loan calculator shows the equivalent reducing-balance APR next to any flat rate you enter, rather than letting the stated number stand on its own.

For scale, the same ₦100,000 over 6 months from a bank at 30% reducing balance costs ₦18,155 a month and ₦8,930 in total interest — against ₦30,000 on the flat-rate app. Same money, same six months, roughly 3.4 times the interest.

Where it actually goes wrong: the rollover

The headline fee is survivable once. The structure that turns a small loan into a large one is rolling it over.

Borrow ₦50,000 at 10% per 30 days and roll the whole balance six times — six months of not quite being able to clear it:

Balance after six cycles: ₦88,578
Total paid in charges: ₦38,578 on a ₦50,000 loan

Even the "responsible" version — paying just the fee each cycle and leaving the principal untouched — costs ₦30,000 in fees over six months and leaves you owing the original ₦50,000. That's the arithmetic behind the pattern of borrowers who have paid a lender more than they ever received and still have a balance.

A short-tenor loan is only priced sanely if it is genuinely short. The moment its term is uncertain, the annualised rate is the number that describes it, not the fee.

Reading a loan app offer properly

Four questions, in order:

What is the total naira amount I repay, and on what date? Everything else derives from this. If an app won't show it before you accept, that's the answer to a different question.
Is the quoted rate flat or reducing balance? If it's flat, the true rate is materially higher — run it through the calculator rather than estimating.
What are the late fees and the rollover terms? This is where the cost lives, and it's usually the least prominent text on the screen.
Is the lender on the FCCPC's approved digital lenders register? The Federal Competition and Consumer Protection Commission maintains a public list of approved digital money lenders, and the recovery practices that made loan apps notorious — contact-list harvesting, messaging your colleagues — are what the approval regime exists to police. An unlisted app is a separate risk from an expensive one.

Convert any flat rate or fee into a true APR →

The uncomfortable framing

None of this means loan apps are irrational. A ₦50,000 loan for 30 days has real fixed costs to originate, and there is no version of that product that prices at 26.5% a year. The honest reading isn't "these rates are illegitimate" — it's that a 122% annualised product is an emergency instrument, priced like one, and the arithmetic above is what tells you whether you're using it as an emergency instrument or as a substitute for income.

The one decision the maths does settle: if you have access to any form of reducing-balance credit — a bank personal loan, a cooperative, a salary advance — the cost difference is not marginal. It's multiples.

The Monetary Policy Rate figure is from the Central Bank of Nigeria's published Monetary Policy Committee decisions, checked as of September 2026. All loan figures in this article are illustrative worked examples using rate structures common in the Nigerian digital lending market — they are not quotes from any specific lender, and actual fees, tenors and penalties vary by provider and by borrower. The APR conversions use the same annuity and rate-solving maths as our loan calculator. This article is general information, not financial advice.