Housing & credit
Fixed-Rate vs. Adjustable-Rate Mortgages
Compare payment paths, rate-reset risk and total cost using terms from actual Loan Estimates.
Start with the Loan Estimate
A mortgage comparison should use the loan amount, term, interest rate, principal and interest payment, mortgage insurance, estimated taxes, insurance, closing costs and cash to close from actual lender documents. A payment quote without these items is incomplete.
Compare Loan Estimates issued on similar dates because rates can move. Separate lender-controlled charges from property taxes and insurance, which do not prove that one lender is cheaper.
Fixed and adjustable loans carry different risks
A fixed-rate mortgage keeps the note rate and principal-and-interest schedule fixed, though the total housing payment can still change. An adjustable-rate mortgage can reset after an initial period. After that period, the index and lender-set margin determine the rate, subject to the loan's caps; SOFR is one possible index, not a universal default.
For an ARM, identify the initial adjustment cap, the cap on each subsequent adjustment and the lifetime cap. Review the Projected Payments table and ARM disclosures in the actual Loan Estimate, then test the fastest payment increase permitted by those terms. A low initial payment should not be presented without the later reset risk.
Compare the years you expect to keep the loan
Total interest over 30 years may be less relevant if you expect to move or refinance in five years. Compare cash paid, principal reduced and remaining balance at several holding periods.
Review prepayment penalties, balloon payments and lender credits. A lender credit can reduce closing cash while increasing the rate. A loan described as having no closing costs still pays those costs through another part of the transaction.
Bottom line
Use complete Loan Estimate terms, stress-test any ARM and compare cost and remaining balance at the years you may actually keep the mortgage.
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Sources
This guide is for general education, not personal investment, tax, legal or financial advice. Check current rules and talk with a qualified professional when the decision calls for it.