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The short answer
Yes, if your loan agreement says the rate is variable or linked to a reference rate, the lender can change it during the loan, usually after notice. A fixed-rate loan should not change unless the contract allows it. When the rate rises, the instalment is recalculated on the remaining balance and months, so a 3-point rise on a ₦2.26 million balance adds about ₦3,482 a month in our example.
Many Nigerian bank loans, especially business loans, mortgages, overdrafts and some personal loans, are priced on a variable basis. The offer letter may say the rate is "subject to review", "variable", or set at a margin above the bank's prime or reference rate. When a borrower's instalment rises without warning, the first question is whether the contract allowed it; the second is whether the new figure is correct.
What a variable-rate clause typically says
- Link to a reference rate. The rate is the bank's prime or reference rate plus a margin, and moves when the reference moves.
- Review clause. The bank may review the rate at set intervals or "from time to time" in line with market conditions or regulatory changes.
- Notice. The bank will notify you of the new rate, often in writing, before or on the date it applies.
- Effect. The instalment changes, or the tenor changes with the instalment kept the same.
Some terms carry both a fixed-looking figure and a variable reference. GTBank's QuickCredit page, for example, states 2.95% a month while one clause refers to the bank's prime lending rate "from time to time", as published in October 2026. If your documents point both ways, ask the lender in writing which applies.
What the rules say about changes and notice
For digital, online and non-traditional consumer lenders, the FCCPC's 2025 regulations say changes to a consumer lending contract should only be made where expressly provided for in its terms. They list as unfair a lender that alters a contract's clauses without reasonable notice to the consumer, or that allows unilateral change without stating the circumstances, and they require lenders to notify consumers of circumstances that may affect the terms of their contract. Banks are supervised by the CBN, whose consumer protection rules also cover disclosure; we could not confirm a specific notice period for banks from a primary source, so check your offer letter and ask your bank. This is information, not legal advice.
Why rates move: the MPR link
Variable bank rates tend to follow the CBN's Monetary Policy Rate through banks' funding costs. According to the CBN, the MPR was retained at 26.5% in May and July 2026 and reset to 23% at the 21–22 September 2026 meeting. A cut can lead to lower variable rates over time; a rise can push them up. Banks decide how much to pass on. See how MPR reaches your loan rate.
Floors, caps and margins to look for
Variable clauses are not all equal. Three details decide how much a change can hurt or help you:
- Margin
- The fixed amount added to the reference rate. If the reference falls but the margin is wide, your rate stays high.
- Floor
- A minimum rate. Some contracts say the rate will not go below a stated figure, so a fall in the reference may not reach you at all.
- Cap
- A maximum rate. Rarer in consumer lending, but worth asking for on long loans.
A contract with a floor and no cap moves only one way in practice. Before signing a variable-rate loan, ask the bank to show you the instalment at today's rate and at a rate several points higher, so you know you could still pay if rates rose.
How to recompute your instalment
When the rate changes, the new instalment is the standard equal-instalment figure for the remaining balance, the new monthly rate and the months left:
- Instalment
- Balance × r ÷ (1 − (1 + r)^−n), where r is the monthly rate and n the months remaining
Worked example: a rate rise after a year
Example figures only. ₦3,000,000 over 36 months at 28% a year. The monthly instalment is ₦124,090.76. After 12 payments the balance is ₦2,260,779.01. The bank raises the rate to 31% for the remaining 24 months.
| Before | After | |
|---|---|---|
| Rate | 28% a year | 31% a year |
| Balance | ₦2,260,779.01 | ₦2,260,779.01 |
| Months remaining | 24 | 24 |
| Monthly instalment | ₦124,090.76 | ₦127,573.17 |
- Increase: ₦3,482.41 a month.
- Extra paid over the remaining 24 months: ₦83,577.87.
- If the bank keeps the instalment at ₦124,090.76 instead, the loan takes about one more month to clear.
If your new instalment is far from what this formula gives, ask the bank for the balance, rate and months it used. Our EMI formula guide and amortisation schedule guide walk through the steps.
What to check first
- Find the rate clause in your offer letter: fixed, variable, reference-linked or review.
- Check whether and how you were notified, and the date the new rate applies.
- Recompute the instalment with the formula above.
- Ask for a revised repayment schedule in writing.
- If the change was not allowed by the contract, or no notice was given, complain to the bank in writing first. Digital lenders can be reported to the FCCPC.
- Consider whether refinancing at a fixed rate elsewhere would cost less after fees.
Where Pryme fits
For Loans on Spaces, lent by Solid Allianze Microfinance Bank, the amount, cost and repayment date are set out in the agreement you accept before anything is drawn. See what to read before accepting.
Questions people ask
Can my bank increase my loan interest rate without telling me?
A bank should only change the rate if your contract allows it, and should notify you. Check your offer letter and complain in writing if you were not told.
Why did my loan repayment increase?
Most often because the loan is variable-rate and the lender raised the rate, or because fees or insurance were added. Ask for the rate, balance and months used.
What is the difference between fixed and variable rate loans in Nigeria?
A fixed rate stays the same for the agreed tenor. A variable rate can change during the loan, usually in line with a reference rate such as the bank's prime rate.
Will my variable loan rate fall after the CBN cut the MPR?
It may, but banks decide how much and when to pass changes on. Ask your bank whether it has revised its reference rate since September 2026.
Sources
- FCCPC: Digital, Electronic, Online or Non-Traditional Consumer Lending Regulations, 2025 · accessed Oct 2026
- CBN: Monetary Policy Decisions (305th to 307th MPC meetings, 2026) · accessed Oct 2026
- GTBank: QuickCredit product page and terms · accessed Oct 2026
- CBN: Money Market Indicators (includes prime and maximum lending rates) · accessed Oct 2026
This article is general information, not financial, legal or tax advice. Products described are provided under the terms on this site and are subject to regulation and eligibility.