Mortgage Pre-Approval
Mortgage pre-approval is a lender's conditional commitment to extend a home loan up to a specified amount at a stated interest rate, based on a verified review of the borrower's income, assets, employment, credit score, and debt obligations — providing stronger purchasing credibility than a pre-qualification and typically valid for 60 to 90 days.
In the U.S. residential real estate market, mortgage pre-approval has become an effectively mandatory step for any serious buyer. Sellers and their agents routinely require a pre-approval letter before accepting or seriously considering an offer, particularly in competitive markets where multiple offers are common. The pre-approval letter signals that a lender has reviewed the buyer's financial documentation and determined that, subject to appraisal of the property and final underwriting, the buyer qualifies for a loan up to the stated amount.
Pre-approval differs meaningfully from pre-qualification in the depth of verification involved. A pre-qualification is typically a quick, informal estimate based on self-reported financial information — income, assets, and debts as stated by the borrower — without documentation review or a hard credit inquiry. A pre-approval involves submitting a formal loan application, providing documentation of income (W-2s, pay stubs, or tax returns for self-employed borrowers), bank and investment account statements, authorization for a hard credit inquiry, and often employment verification. The lender reviews this documentation before issuing the letter.
The pre-approval process evaluates several key underwriting criteria. Debt-to-income ratio (DTI) is a central metric: lenders calculate front-end DTI (proposed housing payment divided by gross monthly income) and back-end DTI (all monthly debt payments including the proposed mortgage divided by gross income). Conventional loans backed by Fannie Mae and Freddie Mac generally have maximum back-end DTI guidelines of 45 to 50 percent, though lower DTI ratios qualify for better terms. Credit score thresholds vary by loan type: conventional loans typically require a minimum 620 score, FHA loans can be approved with scores as low as 580 with 3.5 percent down, and jumbo loans (above the conforming limit) typically require 700 or higher.
A pre-approval letter is not a guarantee of a loan. Final approval remains contingent on property appraisal, title search, final underwriting review, and verification that the borrower's financial situation has not materially changed between pre-approval and closing. Lenders re-pull credit shortly before closing and may revisit the application if a borrower has opened new credit accounts, made large purchases on credit, changed employment, or experienced other financial changes. Maintaining financial stability between pre-approval and closing is critical to avoiding disruptions.
Shopping multiple lenders during the pre-approval process is both permitted and financially worthwhile. FICO's rate-shopping window allows multiple mortgage hard inquiries within a 14 to 45 day period to be treated as a single inquiry for scoring purposes. Comparing pre-approval offers from several lenders — including banks, credit unions, and mortgage brokers — can identify differences in rates, fees, points, and loan terms that have a substantial impact on total borrowing cost over the life of the loan.