Reducing Balance vs Flat Rate: Why the "Cheaper" Loan Can Cost You More

A loan advertised at a flat 1.5% per month costs far more than a loan at 1.5% per month on a reducing balance — on a GHS 10,000 loan over 12 months, GHS 1,800 in interest versus roughly GHS 1,004. The percentages look identical; the totals are not even close. Understanding this one distinction will save you more money than almost any other piece of financial knowledge in Ghana.

What "flat rate" really means

With a flat rate, the lender charges interest on your original loan amount every single month, no matter how much you have already repaid.

Borrow GHS 10,000 at a flat 1.5% per month for 12 months:

• Monthly interest: 1.5% of GHS 10,000 = GHS 150, every month
• Total interest: GHS 150 × 12 = GHS 1,800
• Total repayment: GHS 11,800, about GHS 983 per month

Notice the trap: in month 12 you owe less than GHS 1,000 of principal — but you are still paying interest as if you owed the full GHS 10,000.

What "reducing balance" really means

With a reducing balance, interest is calculated each month only on what you still owe. Every repayment shrinks the balance, so every month's interest charge is smaller than the last.

The same GHS 10,000 at 1.5% per month reducing balance over 12 months:

• Month 1 interest: 1.5% of GHS 10,000 = GHS 150
• Month 6 interest: about GHS 80, because roughly half the loan is already repaid
• Month 12 interest: under GHS 15
• Total interest: about GHS 1,004, with a level repayment of roughly GHS 917 per month

Same quoted rate. The flat loan costs almost 80% more.

Why lenders quote flat rates

Because they look small. A flat 1.5% per month is roughly equivalent to a reducing-balance rate of about 2.6–2.7% per month — but "1.5%" fits nicely on a poster. Some lenders also add processing fees, insurance and penalties that never appear in the headline number.

The only honest comparison between two loans is the total cedis you will repay — never the advertised percentage.

Three questions to ask any lender

1. Is this rate flat or reducing balance?
2. What is the total amount I will repay, in cedis, including all fees?
3. What happens if I repay early — do I save interest, or pay a penalty?

A reducing-balance lender rewards early repayment automatically: pay faster, owe less, pay less interest. A flat-rate lender often keeps charging the full schedule regardless.

A quick rule of thumb

If you cannot get a straight answer, convert the offer yourself. Over one year, a reducing-balance loan costs roughly 55–60% of what the same flat rate would charge — because on average you owe only a little more than half the original amount across the term. So when a lender quotes "1.5% flat", read it as costing about the same as 2.6–2.7% reducing balance, and compare it against honest reducing-balance offers at that level. The reverse works too: a reducing-balance quote of 1.5% is competing with flat-rate offers of well under 1%. Very few of those exist in Ghana, which tells you where the value sits.

How KAMCCU prices loans

Every KAMCCU loan is charged on a reducing balance, from 1% per month, with up to five years to repay. Members who have saved for three months can borrow up to four times their savings, and your savings continue earning quarterly interest while you repay. There are no flat-rate tricks: the loan calculator on this site uses the exact reducing-balance formula, so the number you see is the number you pay.

Before you sign anything anywhere, run the amount through a reducing-balance calculator and compare totals. If the "cheaper" loan suddenly looks expensive — now you know why.