Can I actually afford this?

The number on the tag is the price. It is real, and it is not the cost of saying yes. A store account, a credit card, or a 24-month instalment can make a new laptop look like a small debit order. The interest is still yours. So is the month you already have: rent, food, the repayments you did not cancel, and the amount you meant to keep saving.

"Can I afford it?" is a cashflow question before it is a lifestyle one. If the repayment only fits because you stop saving, or because the month was already short, the price was never the part that mattered.

Start from the month, not the thing

Four numbers describe the month before this purchase exists. Take-home is what lands after PAYE and UIF, not the gross figure on the contract. Expenses are rent, food, transport, medical aid, and the rest of a normal month. Debt repayments are the cards, store accounts, car, and bond you already pay. The savings goal is the amount you still want to put away after you say yes.

What is left after expenses and current debt is the room. A new repayment has to fit in that room and still leave the savings goal. If it only fits by spending the goal, FinWise calls it a stretch. If it does not fit at all, or it takes more than 20% of take-home on its own, it is not on these numbers.

Banks do their own affordability assessment under the National Credit Act. This is not that assessment, and it is not a promise that a lender will say yes. It is a way to see whether the purchase crowds out the rest of the month before you sit down with the quote.

A worked example in rands

Take a new laptop at R18,000, financed over 24 months with no deposit, at an illustrative 17.75%. That rate is September 2026 prime of 10.75% plus 7 percentage points, a planning ballpark for an instalment or personal loan, not a quote. Many store accounts sit higher.

The month around it, as an illustration you should replace: take-home R32,000, expenses R18,000, current debt R4,000, and a savings goal of R2,500. After expenses and debt, R10,000 is left before the laptop.

The repayment is about R896 a month, 2.8% of take-home. The true cost is about R21,515. Interest is about R3,515. The month still has R9,104 after the repayment, and the savings goal still fits.

The line on that deal is: You can afford it — but it'll cost you more than you think. The score is 9/10, comfortable. After expenses and current debt, R10,000 is left before this purchase. The repayment is R896, the savings goal still fits, and interest takes the true cost to R21,515.

If you saved R896/month instead, you could buy it in 21 months without debt, and skip about R3,515 in interest.

What the score is actually counting

The number out of 10 is not a credit score. It looks at four things, then stays inside the same band as the sentence so the two cannot disagree.

8 to 10 is comfortable. 5 to 7 is a stretch. 4 or under is not on these numbers. A comfortable score can still carry the costly sentence. That is the point of the laptop: the debit order fits, and you pay about R3,515 for the privilege of not waiting.

Cash, credit, and finance are different questions

Cash on the same laptop does not create a debit order. The price does not fit in one month's leftover, so the honest path is to save it. On this illustration: If you saved R7,500/month, you could buy it in 3 months without debt. The score is 10/10, because the month is healthy and the wait is short. There is no interest.

Credit, modelled as paying the same price off over 12 months at an illustrative 22.5% (prime plus 11.75 points, a card or store-account ballpark), is a repayment of about R1,689 and a true cost of R20,268. You can afford it, and your savings goal still fits. Shorter is not automatically cheaper in the month. It is cheaper over the life of the debt, and heavier while you are paying it.

A credit card is revolving. The calculator treats the term you choose as the plan to clear it, not as a minimum payment. A minimum payment is how a laptop becomes a very long loan. If the quote has a residual or a balloon, this tool does not model it. The car calculator does, for a car.

What a longer term does to the same laptop

Price, deposit, and rate stay put. Only the term changes. A longer term cuts the debit order. It increases the interest, which is why a deal that "fits" on 60 months can be the same purchase you could have saved for sooner.

Change the term in the calculator and the same table updates for your price and your rate. If the only way it fits is the longest term, read that as a warning about the price.

Saving the debit order, instead of paying it

The comparison on a financed deal is simple. Take the repayment you were about to hand to the lender and save it instead. On the default laptop that is R896 a month, and the cash price is yours in 21 months, with the R3,515 of interest left in your account. The loan runs 24 months. Saving the same debit order is shorter, because you are not paying for the money.

That only works if the month can actually spare the repayment. If expenses and current debt already use the take-home, there is nothing to redirect. Fix that month before you add a thing to it. The debt payoff calculator is the tool for the balances you already have. The September 2026 rate note is the worked example behind the prime figure used here, if the quote is linked to prime.

Before you tap accept

A score of 9/10 can still be a bad idea if the emergency fund is the credit card. Keep money you can reach without selling the laptop or refinancing the store account. A financed purchase is a poor emergency fund.

Housing still has to fit beside it. If you are also deciding whether to rent or buy, the rent vs buy calculator is the earlier question. If you want the whole lifestyle turned into a gross salary after PAYE, use the salary you actually need. A car, if that is the thing, belongs in the car calculator, because insurance and fuel do not care that the instalment looked fine.

A stretch can still be a yes you choose on purpose, as long as the rand gap is visible. The calculator will keep showing it. You are allowed to pick the tighter number. You are not required to pretend a 60-month store account is cheap because the debit order fits on one line.

Put your quote in, then track the month

The R18,000 laptop is a sketch so the steps are visible. Your rate, your deposit, and the expenses that actually leave the account are the numbers that matter. A higher store rate, or a month that was already borrowed, can flip a comfortable yes into a no without changing the price on the tag.

Can I actually afford this?

This is a planning aid, not financial, credit, or tax advice. The 10% and 20% lines are household rules of thumb. A lender, and the National Credit Act assessment they run, can reach a different answer on the same payslip.