A fixed-rate mortgage and an adjustable-rate mortgage are not two prices for the same loan — they are two different bargains. The fixed rate sells you certainty for the whole term at a higher starting price. The ARM sells you a lower price for a fixed window of years and hands you the market risk after it. Which one fits is decided almost entirely by one fact about your life, not one fact about the market: how long you will actually keep this loan. Everything else on this page is how to run that test honestly.
On a fixed-rate loan, the rate set at closing is the rate for the life of the loan — 30, 20 or 15 years — and the principal-and-interest payment never moves; taxes and insurance in escrow still change, but the loan itself is finished arithmetic. On an ARM, the rate is fixed only for an opening period — typically 3, 5, 7 or 10 years, named like 5/6 or 7/6 — and then adjusts on a schedule for the remaining term: each new rate is a public index (today usually the 30-day average SOFR) plus the lender’s fixed margin, fenced by caps on the first adjustment, each later adjustment, and the life of the loan, with the payment recalculated over the remaining balance and term each time. The ARM’s opening rate is usually lower than the comparable fixed rate; how much lower varies with the market and can shrink to nearly nothing, so compare the two actual quotes in front of you, never a remembered rule of thumb. The full ARM machinery is in what is an adjustable-rate mortgage.
Put a date on your likely exit — a move for work, outgrowing a starter home, a planned refinance you are already positioned for — and compare it with the ARM’s fixed window, honestly, with slack. If the exit lands well inside the window, the ARM usually wins: you collect the lower rate for exactly the years you hold the loan, and the adjustment machinery never runs on you. If the exit is vague, distant, or simply ‘someday’, you are not inside the window; you are past it, and the fixed rate is the loan that matches the plan you actually have. The borderline years are where budgets decide: an ARM whose fixed period ends around when you might move is a bet that your timing is better than your uncertainty, and the caps in section 3 are how you price that bet before placing it.
The fixed rate’s worst case is quiet: you leave early and discover you paid a higher rate for certainty you never used — a real cost, but a bounded and survivable one. The ARM’s worst case is printed: from the note and rider, compute the payment at the first adjustment cap and the payment at the lifetime cap — the start rate plus that cap, applied to the remaining balance over the remaining term. If the first-cap payment breaks the budget, the ARM does not fit at any opening discount. If both capped payments are survivable, the ARM’s risk is a known number rather than a fear. One more comparison belongs here and is routinely skipped: the total interest over the years you will actually hold each loan, from each loan’s amortization schedule — not over 30 years you will not keep. That is the figure the lower opening rate has to beat, after the fixed rate’s higher early payments are counted. How the schedule itself works is in what is mortgage amortization.
The most common ARM mistake is choosing it on a plan that ends ‘and then I refinance’. A refinance is a new application judged on that future year — income, credit, appraised value and the rates then — and no lender can promise it today. If the capped payments are survivable, a later refinance is a bonus; if the loan only works because the refinance does, the honest choice is the fixed rate now. The same discipline runs the other way for refinancers today: whether swapping your current loan for either type pays is the break-even test in should you refinance your mortgage — closing costs divided by the monthly saving, against how long you will keep the new loan.
Homeowner HQ does not set your rate, calculate your adjustment, or service your loan — the rate you pay is the one your note produces — fixed at closing, or set by your rider’s index, margin and caps on the schedule printed at closing. What HQ keeps straight is the homeowner’s side of the same loan: the balance on the record against the home’s tracked value, refreshed monthly by your own agent, so the equity position the loan sits on is visible between statements — and when an adjustment changes your payment, the new figure belongs in the same record the month it lands.
Your own agent sends a monthly value update from Homeowner HQ — the estimate, labeled as an estimate, with your equity beside it — and HQ runs on Amazon AWS. For this decision the record carries the loan’s own facts next to that equity: if you hold an ARM, your first adjustment date, filed with the index, margin and caps from your rider, so the month the payment can move is never a surprise; if you hold a fixed rate, the term’s end and the balance path instead. Either way, when you weigh selling or refinancing against keeping the loan, the tracked value against the balance is the arithmetic that decides whether the exit your timeline assumes still works at today’s numbers — and any fact about the home that is wrong in the record is corrected with your own agent the same week.
Homeowners are always free. Realtors pay $25/mo to join and lenders join at the $5/mo founding rate, at any book size, with no setup fee; sending messages inside HQ is a $100/mo unlock ($125/mo total for realtors, $105/mo total for lenders). A lender-sponsored realtor joins for $0.
Homeowner HQ is an AI-powered marketing department for agents and lenders — a relationship and revenue engine, not a homeowner database. A homeowner's record routes them back to their own agent; it is never sold and never shown to lenders.