To compare fixed-rate and variable-rate mortgages, line up written offers for the same loan amount, term, down payment, and rate-lock timing. Compare more than the opening rate: include monthly principal and interest, APR, points, fees, and cost over a stated period. For a variable-rate loan, also check how much the payment could rise under the contract’s rate caps—and whether you could afford that payment without selling or refinancing.
This guide uses U.S. terminology and Consumer Financial Protection Bureau (CFPB) disclosures. In U.S. materials, a variable-rate mortgage is commonly called an adjustable-rate mortgage, or ARM.
How fixed-rate and variable-rate mortgages differ
A fixed-rate mortgage keeps its interest rate unchanged under the loan terms. That makes its principal-and-interest payment predictable, assuming the loan is repaid as scheduled. An ARM may start with a fixed introductory rate, then adjust periodically. Its initial rate and payment therefore do not show the full range of possible costs. The CFPB explains the distinction in its fixed-rate and ARM overview.
After an ARM’s introductory period, its rate is generally determined by an index plus a margin set by the lender in the loan agreement, subject to the contract’s terms and caps. The index can move; the margin is specified in the agreement. Read the adjustment dates and frequency, index, margin, payment-recalculation rules, and all rate caps rather than treating the initial payment as representative of the entire loan.
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How to compare borrowing costs fairly
Get offers on the same terms and timing
Ask multiple lenders for written Loan Estimates using the same requested loan amount, term, down payment, and approximate rate-lock date. Mortgage rates can change daily, so offers issued on different dates may reflect market timing as well as lender pricing. Compare the actual written terms, not just advertised rates. The CFPB explains how to review a Loan Estimate and recommends comparing offers from multiple lenders.
Separate the interest rate from APR and fees
The interest rate is the borrowing rate and does not include fees. APR is broader: it reflects the mortgage interest rate plus certain charges, including costs such as points and fees. It can help compare offers, but it is not a complete measure of ARM risk. The CFPB cautions that an ARM’s APR does not reflect the loan’s maximum interest rate. A lower introductory rate—or a lower APR—does not establish that the ARM will remain cheaper after adjustments. See the CFPB’s explanation of the difference between a mortgage interest rate and APR.
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Compare costs over a period that fits your plans
Choose a common holding period, such as the first five years, and compare interest and fees over that period. The CFPB’s Loan Estimate method takes the total paid over five years, including principal, and subtracts the principal repaid. The result estimates interest and fees paid during those five years. The CFPB says borrowers keep a mortgage for about five years on average before moving or refinancing; that is context, not a prediction for any individual borrower.
For an ARM, the CFPB’s five-year calculation assumes the rate stays unchanged. If rates rise, the loan’s actual cost may be higher. Treat the figure as a standardized comparison, not a forecast or guarantee. The CFPB describes the calculation in its Loan Estimate guide.
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What happens to an ARM payment if rates go up?
An ARM’s future payment depends on its adjustment schedule and contract limits. Before comparing it with a fixed-rate offer, find the following terms in the Loan Estimate and loan documents:
- Introductory period: how long the initial rate applies.
- Adjustment frequency: when the rate can first change and how often it can change afterward.
- Index and margin: the index used to calculate adjustments and the lender-set margin added to it.
- Initial, periodic, and lifetime caps: separate limits on how much the rate may increase at the first adjustment, at later adjustments, and over the loan’s life. Two ARMs with the same opening rate can have different exposure because their caps differ. The CFPB advises borrowers to compare ARM rate caps.
- Payment recalculation: when the payment changes after a rate adjustment. Some loans may recalculate less frequently; if a payment does not cover all interest due, the balance could rise.
- Maximum possible payment: the payment allowed under the contract’s rate limits. Ask the lender to show how it is calculated and when it could apply.
Do not assume you will sell or refinance before an adjustment, or that rates will fall. Compare the maximum payment with your budget without relying on a future income increase, sale, or refinance to make it affordable. CFPB guidance covers how ARMs work and what to consider with an adjustable-rate mortgage.
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Build a side-by-side comparison from actual offers
Use the figures in each lender’s written offer and the ARM contract. Do not fill gaps with generic market rates or assumptions about future rates.
| Compare | Fixed-rate offer | ARM offer |
|---|---|---|
| Loan amount and term | Record the offer’s amount and repayment term. | Record the same amount and term, if available. |
| Rate and initial period | Record the fixed rate and confirm the loan terms. | Record the introductory rate and how long it lasts. |
| Monthly principal and interest | Record the quoted amount. | Record the initial amount and request payments at higher rates permitted by the contract. |
| APR, points, and lender fees | Record each from the written offer. | Record each from the written offer; do not treat APR as the ARM’s maximum-rate measure. |
| Adjustment terms | Not applicable to a fixed rate. | Record the adjustment frequency, index, margin, and initial, periodic, and lifetime caps. |
| Maximum payment | Not applicable to the interest rate if it remains fixed; other housing costs may change. | Request the maximum payment under the contract and assess whether it fits your budget. |
| Five-year interest-and-fee estimate | Use the Loan Estimate calculation for the same period. | Use the Loan Estimate calculation, remembering it assumes the rate stays unchanged. |
| Affordability under higher rates | Assess principal and interest alongside other housing costs. | Assess the maximum contract payment without depending on a sale or refinance. |
Keep the full housing payment in view
A fixed interest rate stabilizes principal and interest, not necessarily the entire monthly housing bill. Property taxes, homeowners insurance, and mortgage insurance may change. Check whether a quoted monthly payment includes those items; when it does not, keep them separate from the loan’s principal-and-interest comparison. The CFPB’s Loan Estimate guidance explains the costs and payment components shown in the estimate.
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Which mortgage will cost less?
There is no universal lower-cost choice. The result depends on the actual rates and fees, how long you keep the mortgage, the ARM’s adjustment path and caps, and whether you can manage a higher payment. A useful decision is not just which offer looks cheaper at the start, but whether its cost remains acceptable across the period you expect to keep the loan and the payment scenarios allowed by its terms.
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