Stress test

Definition
The everyday name for the rule requiring the lender to check your ability to pay at a rate higher than your contract rate: the qualifying rate, the higher of your rate plus two points and 5.25% at the time of writing. The test does not change your actual payment; it reduces the amount you can borrow. Example: with $100,000 of gross income and no debt, a 4.5% contract rate would allow borrowing about $520,000 over 25 years if the test did not exist; tested at 6.5%, the maximum falls to around $430,000. The test applies to insured loans and to conventional loans at banks and most federally regulated lenders. Credit unions and some alternative lenders can apply a different rule, which is why the same file can produce two different amounts.
For your plans
Calculate your capacity at the qualifying rate, not the advertised rate. If the resulting amount is not enough, look at what a repaid debt or a lender applying a different rule changes before giving up.