Calculate your monthly mortgage payment, total interest, and view a complete amortization schedule — with taxes, insurance, and PMI.
| Year | Payment | Principal | Interest | Balance |
|---|
A mortgage is a loan specifically used to purchase real estate. The property itself serves as collateral, meaning the lender can foreclose and sell the home if you fail to repay the loan. Most mortgages in the United States are structured as fixed-rate, fully amortizing loans — meaning your interest rate stays the same and every payment reduces your balance until you owe nothing at the end of the term.
When you take out a mortgage, you're essentially agreeing to make equal monthly payments over a set number of years (typically 10, 15, 20, or 30). Each payment covers two components: principal (reducing the amount you owe) and interest (the lender's fee for providing the loan). In the early years, a much larger portion of your payment goes to interest. As the loan matures, more of each payment chips away at principal — this gradual shift is called amortization.
For example, on a $300,000 loan at 6.8% for 30 years, your first payment might be about $1,960. Of that, roughly $1,700 goes to interest and only $260 to principal. By year 25, the split has flipped — most of your payment is reducing the balance. This is why understanding amortization is so valuable: it reveals how your debt decreases over time and how much you truly pay for the home.
This is one of the most important decisions you'll make as a borrower. Both loan terms have real advantages, and the right choice depends on your financial situation, monthly budget, and long-term goals.
| Factor | 15-Year Mortgage | 30-Year Mortgage |
|---|---|---|
| Monthly Payment* | ~$2,655 | ~$1,960 |
| Total Interest Paid* | ~$178,000 | ~$406,000 |
| Total Cost* | ~$478,000 | ~$706,000 |
| Equity Buildup | Fast | Slow |
| Interest Rate | Typically 0.5–0.75% lower | Standard |
| Monthly Flexibility | Less | More |
| Best For | High earners, refinancers | First-time buyers, tight budgets |
*Based on $300,000 loan at 6.8% (30-yr) / 6.1% (15-yr)
The 15-year mortgage saves over $228,000 in interest on a $300,000 loan. However, the monthly payment is nearly $700 higher. If you can comfortably afford the higher payment without sacrificing emergency savings or retirement contributions, the 15-year loan is a powerful wealth-building tool. If the larger payment would strain your budget, a 30-year mortgage with occasional extra principal payments can offer a middle ground.
A fixed-rate mortgage (FRM) locks in your interest rate for the entire loan term. Your principal and interest payment never changes, regardless of what happens to market rates. This predictability makes budgeting simple and protects you if rates rise significantly.
An adjustable-rate mortgage (ARM) has an initial fixed period (commonly 5, 7, or 10 years), after which the rate adjusts periodically based on a market index plus a margin. For example, a 7/1 ARM is fixed for 7 years, then adjusts annually. ARMs typically start with a lower rate than fixed loans, which can mean significant savings — but if rates rise during the adjustable period, your payment increases.
ARMs make the most sense if you're confident you'll sell or refinance before the fixed period ends, or if you expect rates to fall. In a rising-rate environment or if you plan to stay long-term, a fixed rate offers better protection against payment shock.
Your down payment directly determines your loan amount, monthly payment, and whether you need to pay PMI. Here's how different down payment amounts affect your mortgage on a $400,000 home:
A 20% down payment is often cited as the gold standard because it eliminates PMI, results in a smaller loan, and demonstrates financial stability to lenders — often earning a better interest rate. However, saving 20% in expensive markets can take many years, and waiting may cost more in rising markets than PMI would have.
Private Mortgage Insurance (PMI) is required on conventional loans when your down payment is less than 20%. It exists to protect the lender — not you — in case of default. PMI typically costs between 0.5% and 1.5% of the original loan amount per year, paid monthly. On a $350,000 loan, that's $145–$437 per month on top of your regular payment.
PMI is not permanent. Under the Homeowners Protection Act, lenders must automatically cancel PMI once your loan balance reaches 78% of the original purchase price. You can also request cancellation once you reach 80% LTV (loan-to-value) — either through payments, appreciation, or home improvements. Some borrowers use a "piggyback loan" (80/10/10 strategy) to avoid PMI entirely: 80% first mortgage, 10% second mortgage, 10% down payment.
Mortgage points (also called discount points) let you pay upfront to lower your interest rate. One point equals 1% of the loan amount and typically reduces your rate by 0.25%. On a $350,000 loan, one point costs $3,500 and might lower your rate from 6.8% to 6.55%.
Whether buying points makes financial sense depends on your break-even period. Divide the upfront cost by your monthly savings. If one point saves you $55/month, you break even in about 64 months (~5.3 years). If you plan to stay in the home longer than that, buying points is profitable. If you might sell or refinance sooner, skip the points and keep the cash.
Most lenders require an escrow account for property taxes and homeowner's insurance. Instead of paying these bills yourself once or twice a year, your lender collects a monthly estimate and pays the bills on your behalf. Your "PITI" payment — Principal, Interest, Taxes, and Insurance — is what appears on your mortgage statement each month.
Escrow accounts are adjusted annually. If your property taxes increase, your monthly escrow payment increases at the next annual review. This is a common reason mortgage payments rise even when your interest rate is fixed. Always budget for potential escrow increases, especially in jurisdictions with rising property tax assessments.
One often-overlooked factor is the debt-to-income ratio (DTI). Lenders calculate two DTIs: the front-end ratio (housing expenses ÷ gross income, should be ≤28%) and the back-end ratio (all debt payments ÷ gross income, should be ≤43% for most conventional loans). If your DTI is too high, you'll either need a larger down payment, a less expensive home, or to pay down other debts before applying.
Refinancing replaces your existing mortgage with a new one, typically to get a lower rate, shorter term, or access home equity. The decision should be driven by math, not headlines.
The classic rule of thumb is to refinance if you can lower your rate by at least 1%, but the real test is the break-even calculation. Closing costs for a refinance typically run 2–5% of the loan amount. If your closing costs are $6,000 and you save $200/month, you break even in 30 months. If you plan to stay at least that long, refinancing is financially sound.
Other good reasons to refinance include: eliminating PMI (if your home has appreciated to 80% LTV), converting from an ARM to a fixed rate, shortening from 30 to 15 years to pay off the mortgage faster, or doing a cash-out refinance to fund major home improvements that increase the property's value.
You don't have to wait 30 years to own your home free and clear. Making extra principal payments dramatically accelerates payoff and reduces total interest. Even one extra mortgage payment per year — applied to principal — can cut 4–6 years off a 30-year loan. Some strategies:
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