The monthly instalment is often the first number borrowers ask for, but it is not the only number that matters. A useful repayment calculation also needs the principal, term, interest method, fees and repayment frequency.
The four inputs you need
- Principal: the amount financed.
- Rate: the quoted interest rate and whether it is monthly or annual.
- Method: flat or reducing balance.
- Term: number and frequency of instalments.
Then add fees, insurance and other charges to understand the full cost.
Reducing-balance repayment
With reducing-balance interest, interest is charged on the outstanding principal. As principal is repaid, the interest component generally falls. An amortised monthly-payment formula can produce a level instalment even though the split between principal and interest changes.
Flat-rate repayment
With flat interest, the rate may be applied to the original principal for the full calculation period. Because principal repayments do not reduce the base used for the interest calculation in the same way, a flat rate should not be compared directly with a reducing-balance rate just by looking at the percentage.
Example: why method matters
Suppose you are comparing two KES 100,000 loans over 12 months. If both advertise the same nominal percentage but one uses flat interest and the other uses reducing balance, the total interest can differ materially. Ask for the actual repayment schedule instead of assuming the rates are equivalent.
Add the costs that calculators often omit
Processing charges, insurance, valuation, legal charges, excise or other applicable fees can change the amount you receive and the amount you ultimately pay. A calculator on a marketing page is an illustration unless it includes the exact approved product rules.
Use OpenFinance’s calculator as a planning tool
The loan calculator on OpenFinance's loans page lets you test different amounts, rates and terms. Use it to understand affordability, then rely on the formal approved offer for the actual repayment obligation.
Frequently asked questions
What is the best way to compare SACCO loan rates?+
Compare the same principal and term using the same interest method, then include all fees and look at the total repayment.
Is a lower monthly instalment always cheaper?+
No. A longer term can reduce the monthly payment while increasing total interest or fees.
Can an online SACCO calculator show the final amount I will pay?+
Only if it uses the exact approved product terms and all applicable charges. Treat general calculators as illustrations.
Official sources & further reading
Regulatory information can change. Use the current official source before acting.
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