Order sneakers: four easy payments. Book a flight: pay later. Get groceries delivered: split it into installments. Even your paycheck has apps circling it, offering to advance you a piece a few days early for a "small fee" or an "optional tip."

None of this appeared because tech companies got generous. Lending you money, even in tiny slices, is one of the most profitable things an app can do. It's worth understanding the machine before you're inside it.

The business model is the missed payment

Buy-now-pay-later services earn fees from stores because installments make people buy more, and buy bigger. But a chunk of the profit comes from the people who slip: , reactivation fees, on longer plans. The product is designed to feel free right up until it isn't. We break down the fine print in our BNPL guide.

Paycheck advances are in a hoodie

Cash-advance apps market themselves as friendly. But do the math on a $100 advance with a $5 fee repaid in a week, and you're looking at triple-digit annualized cost, which is payday-lender territory with better branding. The "optional tips" are engineered guilt, and they add up the same way. The payday lending guide covers the whole family tree.

The real cost is the normalization

The deepest trick is bigger than any single fee: making borrowing feel like a default setting, every checkout pre-loaded with installments, every balance a few taps from an advance. Once owing small amounts everywhere feels normal, a gets very hard to see clearly.

You don't have to boycott any of it. Just name it what it is (a loan), count it where it belongs (in your budget, not around it), and let the four easy payments stay easy by being rare.

Tip
One rule that keeps all of this simple: if you wouldn't buy it with this week's money, four slices of it over six weeks doesn't change the answer.