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Compare actual, dated Loan Estimates—not broad claims that one mortgage type is always cheaper. A fixed-rate mortgage offers a principal-and-interest payment that does not change with interest rates; an adjustable-rate mortgage (ARM) may start with a lower rate but can reset later. Before choosing an ARM, understand its adjustment rules and make sure you could afford the maximum payment allowed by its terms.
What changes between a fixed-rate mortgage and an ARM?
A fixed-rate mortgage keeps the same interest rate for the loan term, so its principal-and-interest payment is predictable. An ARM typically holds an initial rate for a set period, then adjusts at specified intervals. Depending on the contract and market conditions, that rate—and the payment—can rise or fall. The Consumer Financial Protection Bureau (CFPB) says many ARMs start below fixed-rate mortgages, but the introductory payment alone does not show the eventual cost. CFPB: Fixed-rate and adjustable-rate mortgages.
There is no universal current rate gap to use in a comparison. Rates and fees depend on the borrower, lender, loan terms, and date. Check the difference using comparable offers received around the same time.
How soon could an ARM payment change?
Find the initial fixed-rate period and the adjustment frequency in the ARM’s disclosures. CFPB examples include initial periods of three or five years followed by annual recalculation, but ARM structures vary; the loan contract controls. A loan described as a “5/1 ARM,” for example, commonly signals five years at the initial rate and then yearly adjustments, but verify the actual schedule in the offer rather than relying on shorthand.
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Ask the lender: “How soon could my payment go up?” Confirm the date of the first adjustment, how often later adjustments can occur, and when the payment will be recalculated. CFPB: Adjustable-rate mortgage basics.
What determines an ARM’s rate after the introductory period?
After the initial period, many ARMs calculate the rate using an index plus a lender-set margin, subject to the contract’s caps. The index changes with market conditions; the margin is specified by the lender. A low introductory rate is not necessarily a low fully indexed rate. Ask which index applies, what margin the lender adds, and how the formula works. The CFPB summarizes it as “Index + Margin = Your Interest Rate (subject to any rate caps).” CFPB: ARM index and margin.
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- CONFIDENTLY AND EASILY SOLVES: All your clients' financial questions whether they are buyers, sellers, investors or renters. Increase your perceived professionalism as a new agent, experienced broker or seasoned loan officer. Close more home sales and impress your clients with fast, accurate answers to all their real estate finance questions
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- FIGURE OUT THE RIGHT LOAN: At the press of a button for jumbo, conventional, FHA/VA, or even 80:10:10 or 80:15:5 combo loans; check to see if ARMs or bi-weekly loans, quarterly payments or if interest-only payments are the answer; giving your client more choices; easily perform what if loan or tvm calculations Find loan amount, term, interest or PITI or PI payments
- BECOME AN INVALUABLE RESOURCE: Reduce your clients' confusion and uncertainty; ensuring they are able to make a purchase offer; knowing they can afford the down payment; and determining which is the right loan for them. Date-math for listings and contracts too. Comes with a protective slide cover, quick reference guide, pocket User's Guide, and long-life batteries
How high could the payment go?
Review all the rate caps, not just the first-adjustment limit. An ARM may have an initial cap, a cap on each subsequent adjustment, and a lifetime cap. Check whether the contract also sets a floor that limits how far the rate can decrease. Ask the lender to calculate the highest payment permitted under the loan terms and when that payment could apply.
Also ask how payment recalculation works. Could a payment fail to cover the interest due? Could the loan balance increase? Is there a prepayment penalty? These terms affect the risks and costs beyond the advertised starting rate. CFPB: ARM rate caps and CFPB: ARM fine print.
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How to compare written mortgage offers
- Request at least three Loan Estimates. CFPB advises borrowers to make it a goal to compare offers from at least three different lenders. CFPB: Loan Estimate and CFPB: Compare loan offers.
- Make the offers comparable. Keep the loan amount, term, down payment, occupancy, discount points, and rate-lock assumptions as close as possible. If those differ, account for the differences rather than treating the quoted payments as an even comparison.
- Compare the initial rate, payment, fees, and points. Review the ARM’s adjustment schedule and caps alongside the fixed-rate offer’s costs. Ask lenders whether they can improve their offers, then check that a lower fee was not offset by a higher charge elsewhere.
- Compare the ARM’s future-payment risk. Record its first adjustment date, adjustment frequency, index, margin, caps, any floor, and maximum payment. Read the future-payment disclosures and contract terms.
- Test full housing affordability. Add property taxes, homeowners insurance, and other recurring housing costs to the principal-and-interest payment. For an ARM, test the budget against the maximum payment allowed by its terms, not only the introductory payment.
- Consider costs over a realistic time horizon. Compare what each loan could cost over the period you can reasonably plan for, while treating a future move or refinance as uncertain. Do not rely on selling or refinancing before the ARM adjusts as a substitute for being able to afford the loan.
Is APR enough to compare an ARM and a fixed-rate loan?
No. APR combines the interest rate with certain charges and can help describe borrowing cost, but it is not a ceiling on an ARM’s future rate. The CFPB warns that an ARM’s APR does not show its maximum interest rate and cautions against relying on APR alone or casually comparing APRs for fixed and adjustable loans. Read the rate, fees, adjustment terms, caps, and future-payment disclosures together. CFPB: Interest rate and APR.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Which loan type may fit your situation?
A fixed-rate offer may suit you if payment certainty matters most
A fixed rate may be a better fit if you value a steady principal-and-interest payment or would have difficulty managing an increase. Its predictability can make budgeting easier, though it does not make property taxes, insurance, or other housing costs fixed.
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- SPEAKS YOUR LANGUAGE: Keys clearly labeled in residential mortgage finance terms like Loan Amt, Int, Term, Pmt; this industry-standard calculator is super easy to use on all realty financing matters from finding a loan that works for your client to considering trust deeds investments, or finding remaining balances or balloon payments and more
- CONFIDENTLY AND EASILY SOLVE: Clients' financial questions whether they're buyers, sellers, investors or renters. Increase your perceived professionalism as a new agent, experienced broker or seasoned loan officer. Close more home sales and impress your clients with fast, accurate answers to all their real estate finance questions from PITI Payments to IRR, NPV and Cashflows
- DEDICATED BUYER QUALIFYING KEYS: Enter client's income, debt and expenses to pre-qualify them to only show properties they can afford. Include tax, insurance and mortgage insurance then compare loan options and payment solutions to give your client choices before they make an offer to buy
- FIGURE OUT THE RIGHT LOAN: For your client at the press of a button for jumbo, conventional, FHA/VA, or even 80:10:10 or 80:15:5 combo loans; check to see if ARMs or bi-weekly loans, quarterly payments or if interest-only payments are the answer; giving your client more choices; easily perform what if loan or TVM calculations find loan amount, term, interest or PITI or PI payments
- BECOME AN INVALUABLE RESOURCE: To your clients by reducing their confusion and uncertainty; ensuring they are able to make a purchase offer; knowing they can afford the down payment; and determining which is the right loan for them. Date-math for listings and contracts too. Comes with a protective slide cover, quick reference guide, pocket user's guide, and long-life battery
An ARM may be worth considering if the terms and budget work
An ARM may merit consideration when its specific initial pricing is attractive and you can afford the maximum payment allowed by the contract. Evaluate the offer on its own terms; do not assume a planned move or refinance will happen before an adjustment.
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- Extra large 12-digit angled display.
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- Input any three loan variables to compute the fourth.
Use this checklist before choosing
- What are the initial interest rate and principal-and-interest payment?
- What fees and points apply, and are the offers based on comparable assumptions?
- When can the ARM adjust for the first time, and how often can it adjust afterward?
- Which index and margin determine its rate after the initial period?
- What are the initial, periodic, and lifetime caps? Is there a floor?
- What is the maximum payment under the contract, and can your budget absorb it alongside other housing costs?
- Could the payment fail to cover interest or the balance increase? Is there a prepayment penalty?
- How do the costs compare over a time horizon you can reasonably support without relying on a sale or refinance?
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
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