A home purchase can look affordable when you focus on just one number. A more useful check includes the monthly budget, money needed at closing and cash remaining afterward. Here are five common gaps to close before committing.

1. Treating principal and interest as the full payment

Add property taxes, homeowners insurance, any mortgage insurance and association dues. Budget separately for maintenance and utilities. The CFPB explains why the total monthly payment can exceed principal and interest.

2. Using every available dollar at closing

A down payment is only one cash need. Review closing costs, prepaid items, moving expenses and immediate repairs. Decide what reserve you want after closing. A larger down payment may reduce borrowing, but it can also leave less flexibility for an unexpected expense.

3. Comparing rates without comparing costs

A lower interest rate may come with upfront points; lender credits can reduce upfront costs while increasing the rate. Compare written offers on consistent terms. Use the CFPB’s Loan Estimate comparison guide to review both monthly and upfront costs.

4. Assuming a letter guarantees the loan

Read the conditions on a prequalification or preapproval letter. Ask what has been verified and what remains. Avoid new borrowing or other material financial changes without understanding how they could affect the lender’s review.

5. Counting on a future refinance

Test affordability using the loan you can obtain now. A later refinance depends on future rates, eligibility, property value and transaction costs. It is a possibility to evaluate later, not a guaranteed solution to an uncomfortable payment today.

Before making an offer, write down your monthly ceiling, closing-cash limit and desired remaining reserve. Those three limits make tradeoffs clearer when a property or loan looks attractive.

Next step: Use RateZip’s mortgage rate comparison page to begin shopping, then compare personalized written estimates against your budget.

RateZip (Peklava LLC), NMLS #1592292. General education, not a loan offer or commitment.