How mortgage payments actually work

A plain-language tour of principal, interest, escrow, and why the first years feel interest-heavy.

A fixed-rate mortgage payment is mostly a math contract: the lender recasts a lump sum into equal monthly amounts so the balance reaches zero on a date you both agreed to. Each month, interest is charged only on what you still owe. Early on, that leftover balance is large, so interest takes the first bite of your payment. The rest chips the principal. Next month the balance is slightly smaller, so interest is slightly smaller, and principal slightly larger. That is amortization — not a trick. Escrow items (tax, insurance) are often collected monthly so you do not face a once-a-year surprise. They are not interest, and they can change when the tax bill or premium changes. When you compare loans, look at the rate, points, closing costs, and how long you expect to keep the home. A lower payment from a longer term is real cash-flow relief and usually more total interest.