Start with the rate, but don't stop there. The interest rate tells you what you pay on the loan balance, while APR folds in many of the upfront costs and spreads them over the life of the loan. A lower rate paired with heavy fees can cost more than a slightly higher rate with modest fees, especially if you plan to move or refinance within a few years. The Loan Estimate form is the most useful tool here because lenders must use the same layout, so you can line up origination charges, third-party fees, and cash due at closing side by side. Request a Loan Estimate from each lender on the same day, using the same loan program, before deciding anything.

Most confusion comes from comparing quotes that describe different loans. A 30-year fixed and a shorter fixed loan will never line up, and neither will a conventional loan and an FHA loan, even when the rates look close. Each quote should use the same down payment, credit profile, property type, and occupancy, or the numbers are measuring different things. Lock periods matter too, since a quote locked for 45 days and one locked for 30 days can carry different pricing even at the same rate. Quotes also change through the day as bond markets move, so a morning quote and an afternoon quote are not reliable side-by-side comparisons.

The current environment makes this comparison especially worth doing carefully. Rates have been drifting within a fairly narrow band, and a busy stretch of economic reports this week could push them in either direction. That means a quote that looks like a bargain in the morning may not hold by the time you reach the closing table. If you are close to locking, ask each lender how long their quote is valid and what it costs to extend a lock. Borrowers who wait for a perfect rate often end up comparing quotes that have already moved, so a clean, same-day comparison usually beats chasing the lowest number on a screen.