Rate Structure
Adjustable-rate mortgages, and how to read one before you sign it.
A lower start, in exchange for a rate that can move later. The caps are the whole story.
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Loan Selection
Adjustable-Rate Mortgage (ARM)
A lower start, in exchange for a rate that can move later. The caps are the whole story.
The Margin Never Changes
Your reset rate is index plus margin. The index moves; the margin is fixed at origination. Ask for it by name when comparing quotes.
The Lifetime Cap Is Your Worst Case
Three caps normally apply: first adjustment, each subsequent one, and lifetime. Plan against the lifetime figure, not the intro rate.
Sound If the Fixed Period Outlasts You
Good when you'll likely be gone before the first reset. Risky when the plan relies on refinancing at a rate nobody can guarantee.
Adjustable-Rate Mortgage (ARM) Full Description
Everything you need to know before you apply.
An adjustable-rate mortgage holds an introductory rate for a fixed period and then resets on a schedule for the remainder of the term. Modern ARMs are described by two numbers - a 7/6, for instance, is fixed for seven years and then adjusts every six months. At each reset the new rate is calculated as an index plus a margin. The index moves with the market and is usually SOFR now that LIBOR has been retired; the margin is a fixed number set at origination and it never changes. Ask for the margin specifically, because two lenders quoting the same introductory rate can be offering quite different loans once that margin is applied.
Not sure if an adjustable-rate mortgage fits your situation?
Reading the Caps
What actually bounds your risk is the caps, and they're the part worth reading closely. There are normally three: how far the rate can move at the first adjustment, how far at each subsequent one, and how far it can ever go over the life of the loan. That lifetime cap defines your genuine worst case, and it's the number to plan against rather than the introductory rate that sold you the loan. An ARM can be a sound choice when the fixed period comfortably outlasts how long you expect to keep the mortgage. It's a poor one when the plan depends on refinancing before the reset, because that assumes a future rate environment nobody can promise you.
If you would like to explore whether an adjustable-rate mortgage matches your purchase price, credit profile and long-term budget, reach out to 3E Lending to speak with our licensed Texas mortgage team in Katy.
Adjustable-Rate Mortgage (ARM) - Quick Reference
Straight answers to what borrowers ask most, each one showing the guideline or investor practice it comes from — so you can see where the answer came from, not just take our word for it.
Credit Score
No numeric minimum through DU. Manual underwriting starts at 640 for an ARM, above the 620 fixed-rate floor. Overlays commonly land at 640-680 and tighten at high LTVLoan-to-Value ratio — the loan amount divided by the home's appraised value..
Source: Fannie Mae Selling Guide B3-5.1-01; Eligibility Matrix · varies by lender
Credit History / Strength
Standard conventional expectations. Recent derogatories are scrutinised.
Source: Fannie Mae Selling Guide B3-5.3-07
Interest Rates
Introductory rate below comparable fixed. Resets to index plus a fixed margin.
Source: Fannie Mae Selling Guide B2-1.4-02 · varies by lender
Income / Employment Verification
Full doc. Qualification may use a higher rate than the introductory one.
Source: 12 CFR 1026.43(c); Fannie Mae B3-3.1-01
Self Employment Qualifications
2 years of returns, as with any conventional file.
Source: Fannie Mae Selling Guide B3-3.5-01 · varies by lender
Documentation Difficulty
Standard, plus an ARM disclosure setting out index, margin and caps.
Source: 12 CFR 1026.19(b)
Debt to Income (DTI)
45% typical, to 50% with compensating factors.
Source: Fannie Mae DU / Freddie Mac LPA · varies by lender
Down Payment Requirement
5% common on conventional ARMs. High-balance loans often require 10% or more.
Source: Fannie Mae Selling Guide B2-1.4-02 · varies by lender
Down Payment Collateral Alternatives
Gifts and assistance permitted, as on any conventional loan.
Source: Fannie Mae Selling Guide B3-4.3-04
Out of Pocket Fees
Closing costs typically 2-5% of the loan amount. PMI applies under 20% down and cancels as usual.
Source: 12 U.S.C. 4901-4910 (Homeowners Protection Act); Fannie Mae Servicing Guide B-8.1-04 · varies by lender
Process Speed / Timeframe
30-45 days, the same as a fixed conventional file.
Source: Industry standard, 2026 · varies by lender
Figures on this page reviewed by Kimberli Pham, Mortgage Broker · NMLS ID 2459395, on . Program terms are set by the lender a file is placed with and change over time — each figure cites its source above.
The figures above are program guidelines and illustrative examples, not a quote. Actual terms vary by circumstances - your credit profile, income, the property, occupancy, loan amount, and the lender the file is placed with. Individual lenders also apply their own overlays on top of agency minimums. Nothing on this page is a commitment to lend. Approval depends on completion of underwriting, and not every applicant qualifies.
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