How much interest does a personal loan really add up to?
A personal loan is commonly repaid at 1.5 to 2 times the amount borrowed. In a worked example — R50,000 at an illustrative 24% over five years — the repayments total R86,304, and fees push it higher still.
The instalment hides the total. Two questions reveal it: instalment × number of months = total repaid; total repaid ÷ amount borrowed = the multiple actually being paid.
A worked example, added up to the end
R50,000 borrowed at an illustrative 24% a year over 60 months works out to an instalment of R1,438.40. That sounds manageable — which is the point of quoting loans as instalments.
Multiply it out: 60 instalments of R1,438.40 come to R86,304. That is R36,304 of interest on a R50,000 loan — a repayment multiple of about 1.73 times the amount borrowed, before any fees.
The fees that ride along
Interest is not the only charge. The National Credit Act permits lenders to add a once-off initiation fee and a flat monthly service fee, and unsecured loans often carry credit life insurance as well.
The monthly service fee matters more than it looks because it is flat: at an illustrative R69 a month, it adds R4,140 over 60 months — lifting the worked example's total to R90,444, a multiple of about 1.81. And an initiation fee is commonly added to the loan balance itself, which means interest runs on the fee too, for the full term.
The cap that exists — and what it is
Personal-loan interest rates in South Africa are capped by the National Credit Act, using a formula linked to the repo rate — so the maximum moves when the repo rate moves. The cap is a legal ceiling, not a typical price: the rate on any actual loan quote sits somewhere below it, set by the lender's assessment of the borrower. The cap's existence is worth knowing for one reason — any quote can be checked against the current legal maximum before signing.
Why the longer term costs more
Personal loans follow an amortisation schedule: each instalment pays that month's interest first, and only the remainder reduces the balance. Interest is charged on the outstanding balance — so the longer the balance stays up, the more months it gets charged for.
The same R50,000 at the same illustrative 24%, over 36 months instead of 60: the instalment rises to R1,961.64 — R523.24 more each month — but the total repaid falls to R70,619. Interest drops from R36,304 to R20,619. The shorter term costs R15,685 less, for the identical loan at the identical rate.
That is the trade quoted terms rarely spell out: the smaller instalment is not the cheaper loan. It is the same loan, rented for longer.
Three numbers that describe any loan
Every loan quote already contains all three — they are just never printed. The same arithmetic at house scale is covered in "What does a home loan really cost over 20 years?"
- Total repaid: instalment × months, plus monthly fees × months
- Total interest and fees: total repaid minus the amount borrowed
- The multiple: total repaid ÷ amount borrowed — the worked example runs from 1.41× (36 months, no fees) to 1.81× (60 months, with the service fee)
Terms used on this page
- amortisation
- How a loan gets paid down: each instalment covers that month's interest first, and only the remainder reduces the balance — which is why early payments barely dent the debt.
Reviewed July 2026