Complete Mortgage Guide — United States

How Mortgages Work in United States

The Federal Reserve’s federal funds rate indirectly influences mortgage rates, but the 30-year fixed mortgage rate is more directly tied to the 10-year Treasury yield. The government-sponsored enterprises (GSEs) — Fannie Mae and Freddie Mac — play a crucial role by purchasing conforming mortgages from lenders, creating liquidity that enables the widespread availability of 30-year fixed rates. The CFPB (Consumer Financial Protection Bureau) regulates mortgage lending practices under the Dodd-Frank Act

Use our mortgage calculator to see how different rates and terms affect your monthly repayments.

Types of Mortgages Available

The US offers extraordinary variety: 30-year fixed (the iconic American mortgage — a fully-fixed rate for three decades), 15-year fixed (lower rate, higher payments, faster payoff), 5/1 ARM (fixed for 5 years, adjusting annually thereafter — also available as 7/1 and 10/1), FHA loans (government-insured, lower credit and down payment requirements), VA loans (for military — 0% down, no PMI), USDA loans (0% down for rural properties), and jumbo loans (above conforming limits). Conventional conforming loans (meeting Fannie/Freddie guidelines) offer the best rates for well-qualified borrowers

Read our mortgage types comparison for a detailed side-by-side analysis of each product.

How Much Can You Borrow?

The DTI (Debt-to-Income) ratio is the primary metric: front-end ratio (housing costs) should not exceed 28-31%, and back-end ratio (all debts) should not exceed 43-50% depending on the loan programme. FHA allows up to 50% back-end DTI with compensating factors. The Qualified Mortgage (QM) rule generally caps DTI at 43% for the safest loan classification. Credit score significantly impacts rate — 740+ gets the best pricing, while 620 is the minimum for most conventional loans

The maximum loan-to-value in United States is Conventional loans: minimum 3% down (97% LTV) through Fannie Mae HomeReady or Freddie Mac Home Possible. Standard conventional requires 5% minimum. FHA: 3.5% down with credit score 580+, 10% with score 500-579. VA and USDA: 0% down. Jumbo loans typically require 10-20% down. PMI (Private Mortgage Insurance) is required for conventional loans above 80% LTV and can be removed once equity reaches 20%. Loan terms extend up to 30-year and 15-year fixed are standard. ARMs offer initial fixed periods of 3, 5, 7, or 10 years. Some lenders offer 20-year and 25-year terms. The 30-year fixed rate is overwhelmingly the most popular product, chosen by approximately 90% of borrowers.

The Application Process

Get pre-approved (not just pre-qualified) — a pre-approval letter with verified income and credit is much stronger than pre-qualification. Provide ID, Social Security number, W-2s (last 2 years), pay stubs (last 30 days), federal tax returns (last 2 years), bank statements (2 months), and details of all debts and assets. The lender pulls your credit report from all three bureaus (Equifax, Experian, TransUnion). After contract acceptance, the lender orders an appraisal. Closing takes 30-45 days. A title company or attorney handles closing, document signing, and fund disbursement

Costs and Fees

Origination fee of 0-1% of the loan amount. Appraisal fee of $400-700. Credit report fee of $30-50. Title insurance of 0.5-1% of the purchase price. Attorney/closing agent fee of $500-1,500. Recording fees vary by county. Discount points (optional — 1 point = 1% of loan amount, buying down the rate by approximately 0.25%). FHA Upfront Mortgage Insurance Premium (UFMIP) of 1.75%. VA Funding Fee of 1.25-3.3%. Total closing costs typically 2-5% of the loan amount, partially negotiable with the seller

What Makes United States’s Mortgage Market Unique

The 30-year fixed-rate mortgage is the defining feature of American housing finance and is virtually unique globally. In most countries, rates adjust every 1-10 years, but American borrowers can lock in a rate for three full decades. This is possible because of the GSE securitisation system — Fannie Mae and Freddie Mac buy conforming loans from lenders and package them as mortgage-backed securities, transferring interest rate risk to capital markets investors. This system, established in the 1930s-1960s, has created the most liquid and borrower-friendly mortgage market in the world

Refinancing Your Mortgage

Refinancing is straightforward and common. Rate-and-term refinance replaces your existing mortgage with a new one at a better rate or different term. Cash-out refinance allows borrowing above your current balance (up to 80% LTV) to access equity. Streamline refinances (FHA, VA, USDA) simplify the process with reduced documentation and no appraisal. Closing costs on a refinance are similar to the original purchase (2-5% of the loan amount). The break-even calculation — how many months of savings it takes to recoup closing costs — determines whether refinancing makes sense. There is no prepayment penalty on most US mortgages

Read our refinancing guide for a step-by-step walkthrough.

Government Schemes and Support

FHA loans provide access for lower credit scores and lower down payments (3.5%). VA loans offer 0% down and no PMI for military veterans and active service members — one of the most generous mortgage benefits in the world. USDA loans provide 0% down for rural and suburban properties. Fannie Mae HomeReady and Freddie Mac Home Possible offer 3% down for lower-income borrowers. State Housing Finance Agencies (HFAs) provide down payment assistance, closing cost grants, and below-market rate programmes. The mortgage interest deduction on loans up to $750,000 provides tax benefits for itemising homeowners

Check our government grants guide for the latest programmes and eligibility details.

Tips for Getting the Best Deal

Shop multiple lenders — the rate spread between the best and worst offer can be 0.5-1.0%, costing tens of thousands over the life of the loan. Check credit union rates — they often beat big banks. Get your credit score to 740+ before applying for the best pricing. Consider 15-year fixed if you can afford the higher payments — the rate is typically 0.5-0.75% lower than 30-year. Make one extra payment per year (or pay bi-weekly) to shave 4-5 years off a 30-year mortgage. For FHA borrowers, refinance to conventional once you hit 80% LTV to eliminate the permanent mortgage insurance premium

Next Steps

Use our mortgage calculator to model different scenarios, read our property buying guide for the full purchase process, or browse United States FAQs for quick answers.