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PennyWhys

banking

Why your bank charges what it charges. The actual mechanics behind fees, rates, and FDIC plumbing.

4 explainers · View all categories →

banking

Why renting isn't throwing money away

The rent-versus-buy calculation depends on maintenance costs, mortgage interest rates, and the opportunity cost of the down payment.

banking

Why a 30-Year Mortgage Costs Roughly Twice the Price of the House

An amortization schedule reveals the true cost of borrowing. On a standard loan, total interest often exceeds the principal amount.

banking

Why do banks pay almost nothing on savings while charging 22% on credit cards?

The gap between a savings rate and a credit card APR comes down to net interest margin and deposit funding costs. Big banks have other sources; online banks do not.

banking

Why overdraft fees exist (and why they're so much bigger than the overdraft)

The $35 your bank charges to cover a $4 coffee isn't a punishment fee. It's the price of a tiny short-term loan you didn't ask for — but the math behind it is real.