Estimate principal and interest first, then add the recurring costs that affect your housing budget. Property tax, homeowners insurance, mortgage insurance and association dues can make the amount you need each month substantially different from the loan payment alone.
This US-dollar calculator models a fully amortizing, fixed-rate mortgage. It estimates costs from your inputs; qualification, property valuation and the actual offer come from the lender. The starting 6% rate is a fictional example.
Estimate the monthly housing subtotal
Gather the costs in the right units
Enter the loan principal after the down payment, including any costs actually financed. Enter the contractual interest rate and the term in months. For taxes and homeowners insurance, use annual amounts; for mortgage insurance and HOA dues, use monthly amounts. Convert quarterly HOA dues by dividing by three.
| Cost | Where to check | What to watch |
|---|---|---|
| Loan principal and interest rate | Your lender’s written terms or Loan Estimate. | Use the loan balance, not the purchase price or APR. |
| Property tax | Local taxing authority and the transaction estimate. | An existing owner’s bill may reflect exemptions or a valuation that will change. |
| Homeowners insurance | A quote for the property and coverage. | Add separate flood or other property policies to the annual input if applicable. |
| Mortgage insurance | The lender’s estimate for the loan program. | Enter the expected monthly amount; this model does not determine eligibility or cancellation. |
| HOA dues | Current association documents. | Include regular dues here; budget special assessments separately. |
These costs may be paid to different recipients. The result is a budgeting subtotal, so an amount included here can be due separately from the lender's bill. Avoid counting the same tax or insurance expense twice when comparing an escrow-inclusive payment.
A fictional monthly budget
Change one input at a time to see the effect. A higher down payment changes principal; it may also change an actual lender's rate or mortgage-insurance terms, which you would need to update separately.
Reconcile the result with a Loan Estimate
The CFPB Loan Estimate explainer separates loan terms, projected payments and closing costs. Compare its principal-and-interest line with the calculator first. Then match mortgage insurance and escrow items, checking which taxes, insurance and assessments are included or paid separately.
Interest rate and APR answer different questions. APR includes certain additional borrowing charges; the contractual rate drives this payment model. The CFPB rate-versus-APR guide identifies their locations on the Loan Estimate. A quote with a lower rate can still have costs that matter to your decision.
When comparing lenders, keep loan amount, type and term consistent and inspect fees, lender credits and the period you expect to keep the loan. Use the CFPB comparison workflow alongside the monthly budget. Record the quote date and any rate-lock conditions so you know which figures are still usable.
Plan for costs and changes beyond the estimate
Cash to close is a separate question. The down payment, closing costs and prepaid or initial escrow amounts affect the cash needed at closing. A monthly estimate cannot tell you that total. Use the lender's current disclosure and avoid treating a prepaid item as an extra permanent monthly cost.
Fixed principal and interest does not freeze every expense. Taxes, insurance and association charges can change. Set aside a separate amount for maintenance, repairs, utilities and special assessments. The model holds your entered recurring costs constant and does not predict future bills.
Different loan structures need different modeling. Adjustable rates, temporary buydowns, interest-only periods, balloons, irregular payments and early payoff are outside this calculator. Ask the lender for the applicable payment scenarios. The amortization table shows principal and interest only, with a final rounding adjustment; an exact lender schedule can differ.
For a simpler installment-loan estimate, use the general loan calculator. To organize obligations before a purchase, start with the debt repayment plan. Explore the loans and credit library for related topics.
US guidance reviewed October 6, 2026. Explore loans, credit and debt guides.