What Goes Into a Mortgage Payment?
The classic PITI breakdown:
- •P — Principal & Interest (the loan itself)
- •I — Homeowners Insurance
- •T — Property Taxes
- •(Sometimes I also includes PMI — Private Mortgage Insurance)
Many lenders escrow taxes and insurance into one monthly payment so you don't face large annual bills alone.
Down Payment and PMI
On many conventional loans in the US, a down payment below 20% triggers PMI, which protects the lender if you default. PMI adds to your monthly cost until you've built enough equity (often 78–80% LTV) to remove it.
| Down payment | Typical impact |
|---|---|
| 20%+ | Often no PMI on conventional |
| 5–19% | Usually PMI required |
| FHA loans | MIP rules differ — research current limits |
A larger down payment also reduces the loan amount, which lowers interest paid over time.
Fixed vs Adjustable Rate
Fixed-rate mortgages keep the same rate for the whole term — predictable payments.
ARMs (Adjustable-Rate Mortgages) start with a lower teaser rate, then adjust with an index + margin. They can save money if you move or refinance before adjustment, but carry payment shock risk.
Always read the cap structure: how much the rate can change per adjustment and over the life of the loan.
Points and Closing Costs
Discount points are prepaid interest: you pay more at closing to buy down the rate. Whether points pay off depends on how long you keep the loan — divide the upfront cost by monthly savings to find the break-even in months.
Closing costs (appraisal, title, origination) are separate from the home price — budget 2–5% of purchase price as a rule of thumb, but it varies widely.
How to Use This Mortgage Calculator
Enter home price, down payment, interest rate, loan term, and optional taxes, insurance, PMI, and HOA. You'll see:
- •Total monthly payment (PITI + extras)
- •Principal & interest split
- •Amortization and payoff insights where the tool supports them
Use it to compare scenarios before talking to lenders — but always get an official Loan Estimate before committing.