Mortgage underwriting.

In plain English

Mortgage underwriting is the step where a lender checks whether you can actually repay the loan you applied for. An underwriter (a person or an automated system) verifies your income, employment, debts, credit history, savings, and the value of the home. They are answering one question: how likely are you to pay this back, and is the house worth enough to cover the loan if you do not. Approval often comes with conditions, meaning a few more documents the lender needs before the final yes.

01Why it matters

This is the stage where a loan that felt like a sure thing can stall or fall apart, often right before closing, so missing paperwork or a new debt can cost you the house.

02The math, step by step

You apply for a $300,000 mortgage. The underwriter pulls your credit, confirms your pay stubs and tax returns, adds up your monthly debts, and orders an appraisal. They notice you opened a new car loan two weeks ago, which pushed your debt-to-income ratio too high, so they ask you to explain it or pay down a balance before they approve. The specific debt-to-income limit varies by loan type and lender overlay, but many lenders look for a total debt-to-income ratio at or below about 43%, with some allowing more when you have strong compensating factors.

03What this is NOT

04Receipts

Every figure on this page is sourced to a primary document. Tap to open the original.