US home-buying costs: a planning guide

A transparent starting point for estimating the payment, cash needed, and affordability limits behind a US home purchase.

Updated 2026-09-06 · Reviewed against official CFPB regulations and the 2026 U.S. Financial Engine specifications. · Fact-Checked Lending Norms

Start with the full housing payment (PITI + HOA + PMI)

Compare principal and interest with property tax, homeowners insurance, HOA dues, and mortgage insurance. A low advertised payment can omit recurring escrow additions that matter to both your personal budget and a lender's debt-to-income calculation.

Compare offers by APR and total cost

The note rate prices the loan balance, but APR includes prepaid finance charges such as points and lender origination fees. Check the complete amortization schedule to determine whether keeping the mortgage long enough offsets upfront closing points.

Understand the Homeowners Protection Act (PMI)

Borrowing with less than a 20% down payment requires Private Mortgage Insurance (PMI). Under federal law (HPA 1998), PMI automatically cancels when your loan balance reaches 78% of the original purchase price, or you may request written cancellation once you reach 80% LTV.

Treat affordability as a ceiling

Standard conforming guidelines target a 28% front-end and 36% back-end DTI. Automated underwriting programs (Fannie Mae DU / Freddie Mac LPA) can extend this up to 43%–50% for applicants with prime credit and cash reserves. Use the calculation as a ceiling, not a spending target.

ℹ️ Statutory Notice & Methodology

Global Finance Calculator provides mathematical estimates for education, planning, and comparison — not regulated financial advice or credit pre-approval. Tax legislation, statutory central bank buffers, and underwriting criteria change. Confirm critical figures with official regulatory publications or a licensed mortgage broker before signing contracts.