Breaking a purchase into smaller payments can make an expensive item feel much more affordable.

That’s part of the appeal of “buy now, pay later” services.

But before choosing a payment plan, it’s important to look beyond the amount of the individual payment and consider the total cost.

A $400 purchase might sound manageable when presented as four $100 payments. But if you’re making several purchases using different payment plans, those small payments can quickly add up.

Before using a buy-now-pay-later option, ask yourself:

Would I buy this if I had to pay the full amount today?

If the answer is no, the payment plan may be making the purchase feel more affordable than it actually is.

Can I comfortably make every payment?

Look at your budget—not just today’s balance. Consider what other bills and expenses will be coming due during the payment period.

Are there fees or interest charges?

Terms vary, so make sure you understand exactly what you’re agreeing to before making the purchase.

Will this interfere with another financial goal?

If you’re trying to build an emergency fund or pay down debt, adding another payment may work against that goal.

There’s nothing inherently wrong with spreading out a purchase when it fits comfortably within your financial plan. The problem comes when payment plans make it easier to spend money you don’t really have.

A useful rule is to treat installment payments just like any other bill. Add them to your budget before you make the purchase.

And remember: affordability isn’t determined by whether you can make the first payment. It’s determined by whether the entire purchase fits comfortably into your financial life.

Convenient payment options can be useful tools—but they shouldn’t turn wants into financial obligations you weren’t prepared to take on.