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6 min read

How Mortgage Pre-Approval Works

Mike Starr

Founder, MortgageWizardTools · M.S. Organizational Management

Last reviewed: August 2026

Mortgage pre-approval is a crucial first step in the home buying process.

Pre-Qualification vs. Pre-Approval

Pre-Qualification: An informal estimate based on self-reported financial information. No credit check.

Pre-Approval: A formal process involving credit check, income verification, and document review. Results in a letter stating how much you can borrow.

Documents You'll Need

  • •Pay stubs (last 30 days)
  • •W-2s or 1099s (last 2 years)
  • •Tax returns (last 2 years)
  • •Bank statements (last 2-3 months)
  • •Photo ID
  • •Employment verification
  • •List of debts and assets

The Pre-Approval Process

  1. •Choose a lender (shop at least 3)
  2. •Submit your application and documents
  3. •Lender pulls your credit report
  4. •Underwriter reviews your finances
  5. •Receive your pre-approval letter

How Long Does Pre-Approval Last?

Typically 60-90 days. If it expires before you find a home, you'll need to reapply.

Tips for a Smooth Pre-Approval

  • •Don't open new credit accounts
  • •Don't make large purchases
  • •Don't change jobs if possible
  • •Keep paying all bills on time
  • •Have all documents ready

Does Pre-Approval Guarantee a Loan?

No. Final approval depends on the property appraisal, title search, and your financial situation remaining stable through closing.