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The short answer
If the lender charges the same rate per month, a 90-day loan costs more in total than a 30-day loan for the same amount, because you pay that monthly charge three times. The fair comparison is cost per ₦1,000 per month: a longer tenor can cost more in naira yet still be cheaper per month, so you need both numbers before choosing.
Loan apps and some banks let you slide a bar between 30, 60 and 90 days, and the repayment figure changes as you move it. Many borrowers pick the longest tenor because the instalments look gentler. That can be the right call, but only once you know what the extra time costs. This guide works through the arithmetic with labelled examples, so you can do the same with the numbers your app shows you.
The rule: same monthly rate, longer tenor, bigger total
Interest is a price for time. When a lender quotes a rate per month, keeping the money for three months means paying that price three times. The table below uses an example rate of 10% a month on ₦100,000, charged on the original amount for the whole term, which is how many short-term lenders work.
| Example: ₦100,000 at 10% a month | 30 days | 90 days, one repayment | 90 days, 3 instalments (flat) |
|---|---|---|---|
| Interest | ₦10,000 | ₦30,000 | ₦30,000 |
| Total repaid | ₦110,000 | ₦130,000 | ₦130,000 |
| Each payment | ₦110,000 once | ₦130,000 once | ₦43,333.33 x 3 |
The 90-day loan costs ₦20,000 more. Notice the third column: splitting the ₦130,000 into three payments does not reduce the interest when it is worked out on the full ₦100,000 for the whole period. You are handing back part of the money after month one, yet still paying interest as if you had all of it. That is the flat-rate effect, covered in more detail in APR vs flat fee: what a loan really costs.
When the 90-day loan uses a reducing balance
Some lenders charge interest only on what you still owe. Using the same example rate of 10% a month on a reducing balance, three equal instalments come to ₦40,211.48 each, a total of ₦120,634.44. Interest falls to ₦20,634.44 because each payment cuts the balance the next month's interest is worked on. The 90-day loan still costs more than the 30-day one in naira, but less than the flat version. Ask the lender, or read the loan agreement, to find out which method applies.
When the longer tenor is cheaper per month
Lenders do not always charge the same monthly rate across tenors. A common pattern is a rate quoted for the whole tenor, for example 15% for 30 days and 30% for 90 days. In that case:
- 30 days: ₦15,000 interest on ₦100,000, which is ₦150 per ₦1,000 per month.
- 90 days: ₦30,000 interest on ₦100,000, which is ₦100 per ₦1,000 per month.
- The 90-day loan costs ₦15,000 more in total, but each month of credit is cheaper.
So the honest answer to which costs more depends on what you are measuring. Total naira tells you what leaves your account. Cost per ₦1,000 per month tells you which price for time is lower. The method is set out step by step in How to compare two loan offers: cost per ₦1,000 borrowed.
How to choose a tenor
Pick the tenor that matches the date the money to repay will actually arrive, not the one with the smallest instalment. Borrowing for 90 days when your salary lands in 25 days means paying two extra months of interest on money you could have returned. Borrowing for 30 days when your income will not arrive until day 60 is worse: a missed repayment can bring late charges, penalty interest and a rollover, which usually cost more than choosing the longer tenor at the start. See what a loan app rollover costs for that arithmetic.
Steps before you move the tenor slider
- Write down the date your repayment money will arrive.
- For each tenor offered, note the total repayable and any fee shown separately.
- Subtract the amount you will actually receive to get the total cost.
- Divide the total cost by (amount received ÷ 1,000) and by the number of months.
- Choose the shortest tenor you can repay on time; if two are close, take the lower cost per ₦1,000 per month.
What the rules require lenders to show you
For digital and app-based consumer lenders, the FCCPC's Digital, Electronic, Online, or Non-Traditional Consumer Lending Regulations, 2025 (made 21 July 2025) require interest rates, repayment terms and fees to be fully disclosed before any transaction is completed, and current rates and charges to be displayed on the lender's platforms. The regulations do not set a maximum rate, and banks licensed under BOFIA are outside their scope, according to a legal review published in October 2025. The planning notes for this series record that enforcement of the regulations was suspended and later resumed after a court ruling, so check the FCCPC's current position before relying on it. This is information, not legal advice.
Where Pryme fits
Pryme Financial Ltd is a technology company, not a lender. Loans on Spaces are lent by Solid Allianze Microfinance Bank Ltd and can only be spent with Spaces merchants. A limit may be offered based on how your account is run, and the agreement shows the amount, cost and repayment date in full before you accept. Apply the same tenor test above to that agreement before you accept.
Questions people ask
Is a 3-month loan cheaper than a 1-month loan?
Not in total if the monthly rate is the same: you pay the monthly charge three times. It can be cheaper per month if the lender charges a lower rate for the longer tenor, so compare cost per ₦1,000 per month.
Why does my loan app charge more interest for 90 days?
Because interest is charged for time. At the same rate per month, three months of credit costs about three times one month, and more if the rate is worked on the original amount throughout.
Should I choose a longer tenor to avoid default?
If your income will not arrive in 30 days, a longer tenor chosen at the start is usually cheaper than missing a 30-day repayment and paying late charges or a rollover.
How do I know if my loan uses flat or reducing balance interest?
Check the loan agreement or ask the lender. If interest is the same in every instalment and worked on the original amount, it is flat; if it falls each month, it is on a reducing balance.
Sources
- FCCPC: Digital, Electronic, Online, or Non-Traditional Consumer Lending Regulations, 2025 (made 21 July 2025) · accessed Oct 2026
- TNP: Review of the Digital, Electronic, Online, or Non-Traditional Consumer Lending Regulation 2025 (22 Oct 2025) · 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.