The cost of an instalment purchase can be very different from the price displayed on the tag. When financing involves interest, the number of instalments, the applied rate, and other charges can turn an apparently affordable product into a commitment that weighs on the budget for months.

Why the cash price is not the same as the financed cost

When paying in cash, the consumer settles the purchase immediately. In financing, a financial institution or the seller allows payment over time and may charge interest for that credit. Comparing only the instalment amount with the product price does not show the real cost. It is necessary to observe how much will be paid when adding all instalments together.

How interest rates and terms affect a purchase

Interest increases the cost of money over time, while longer terms can raise the total amount paid — even when they reduce each individual instalment. That is why a small monthly payment does not necessarily mean a cheaper purchase. It is also important to consider all existing expenses and instalments. A commitment that fits the budget on its own can become heavy when added to other debts, reducing room for unexpected expenses.

Four numbers to check before choosing instalments

What to check before accepting a financing offer

Consumers need to look beyond the advertised instalment. The contract should make clear how much is being financed, how many instalments there will be, and what the total cost of the transaction will be.

Before closing the purchase, check:

• Cash price of the same product

• Down payment required (if applicable)

• Amount of each instalment and total number of payments

• Interest rate stated in the contract

• Total cost until the last instalment

• Insurance or additional services included in the offer

• Due date and consequences of late payment

• Impact of the new instalments on existing monthly expenses

How to choose the best instalment plan

Compare offers by the total amount paid, considering down payment, number of instalments, and term. A smaller instalment does not always represent the cheapest option — especially when the commitment extends over a longer period.

Even interest-free instalments can cost more than paying in cash if there is a discount for immediate payment. Before financing, it's also important to assess the impact of instalments on income and avoid piling up commitments.

Visualising the difference between price and total cost

Imagine a product advertised at a certain cash price and another option with a down payment plus several instalments. Adding the down payment and all instalments shows how much money will actually leave your pocket.

This simple calculation helps prevent the instalment amount from hiding the total cost. The bigger the difference, the greater the financial weight associated with the term and charges.

Cash or instalments — how to decide?

Paying in cash can reduce the cost of the purchase, but using all your savings may compromise financial security. The decision should consider price, interest, liquidity, and the impact of the instalment on your budget.

When choosing instalments, compare the cash price with the total paid, as well as the number of instalments. A larger down payment and shorter term can reduce interest, but the best option is the one that keeps the purchase within budget until the final due date.