How mortgage payments work
Every mortgage payment is split into two parts: principal (the amount you borrowed) and interest (the cost of borrowing). Early in the loan, most of your payment goes toward interest; over time the balance shifts and more goes to principal. This is called amortization.
Beyond principal and interest, your full monthly housing payment often also includes property taxes, homeowners insurance, and possibly PMI (private mortgage insurance) if you put down less than 20%. Those extra costs are why your total housing bill can be higher than the number this calculator shows.
What affects your monthly payment
- Loan amount — the home price minus your down payment.
- Interest rate — even a small difference matters; a 1% higher rate can add well over $100 to the monthly payment on a $300,000 loan.
- Loan term — a 30-year term has lower payments but far more total interest than a 15-year term.
- Down payment — a larger down payment shrinks the loan and can eliminate PMI.
30-year vs. 15-year mortgage
A 30-year fixed mortgage is the most common choice because it keeps payments affordable. A 15-year mortgage usually carries a lower rate and saves a large amount of total interest, but the monthly payment is noticeably higher. The right choice depends on your cash flow and long-term goals.
Tips to lower your mortgage payment
- Improve your credit score before applying — better scores earn better rates.
- Shop multiple lenders; rates and closing costs vary.
- Put down at least 20% to avoid PMI.
- Consider paying points or a shorter term if it fits your budget.