What's the catch with those 'pay in 4' interest-free installment plans at checkout?

The 'pay in 4' model splits a purchase into four biweekly payments with no interest if you pay on time. The catches are behavioral and structural. First, they encourage overspending: studies from the CFPB and others show buy-now-pay-later nudges people to buy more than they would with cash. Second, late fees and, on some plans, deferred interest can apply if you miss a payment. Third, most link to a debit card or bank account, so missed payments can trigger overdraft fees.

The biggest risk is stacking several plans at once and losing track of the combined biweekly drain on your paycheck. If you use them, cap it to one at a time, autopay from an account with a buffer, and only for something you'd buy anyway. Treat it as a budgeting trap, not free money.