Principal, interest, and other monthly housing costs
Monthly total adds principal and interest, monthly shares of annual property tax and homeowners insurance, HOA fees and the enabled mortgage-insurance quote. Down payment amount used shows the selected amount or calculated percentage. Loan-to-value is loan principal divided by home price. Mortgage insurance is zero when its option is off.
For a loan comparison that includes a separate upfront processing fee, the EMI Calculator reports the fee alongside reducing-balance interest.
The formula
Loan principal is home price minus down payment. Annual taxes and insurance are divided by 12, then added to principal and interest and the monthly association fee. Percentage down payment = home price × entered percentage ÷ 100. Loan-to-value = loan principal ÷ home price × 100. If enabled, add the entered monthly mortgage-insurance premium to the budget; it does not change principal-and-interest amortization.
A 400,000 home with 20% down
A down payment of 80,000 leaves a 320,000 mortgage. At 6.5% over 30 years, principal and interest are about 2,022.62 a month before taxes, insurance, or association fees.
How to use this calculator
- Enter the price, choose a currency or percentage down payment, and enter the fixed contract rate and whole-year term.
- Open Advanced options to replace annual tax, homeowners insurance and monthly HOA estimates. Enable mortgage insurance only when you have a monthly premium to include.
- Review live loan-to-value, down payment used, the monthly cost breakdown and the principal-and-interest balance schedule.
Principal and interest are only part of housing cost
A fixed-rate mortgage usually keeps principal and interest level, but taxes and insurance can change.
Mortgage insurance is separate from homeowners insurance. When you have a quoted monthly premium, enable its option and enter that amount. This model holds the quote constant; it does not estimate a premium or an automatic cancellation date. Association charges may be paid outside the lender’s bill, so the result is a combined housing budget.
How the mortgage balance falls
Interest is based on unpaid principal. Early in the term, more of each payment covers interest.
Closing costs affect cash needed at purchase but are not automatically part of the loan.
An amount or percentage down payment
A 20% down payment on a 400,000 home is 80,000, leaving 320,000 principal and an 80% loan-to-value ratio. Amount and percentage entries are retained independently. In percentage mode, changing the price changes the down payment automatically; a fixed amount stays fixed in currency mode. The percentage must be below 100% so a positive loan remains.
Assumptions & limitations
What this calculation assumes
- A fixed nominal annual rate with monthly payments.
- Taxes and insurance are spread evenly across twelve months.
- The down payment is paid upfront.
- Any enabled mortgage-insurance quote stays constant in this monthly budget estimate.
What to keep in mind
- Utilities, maintenance and closing costs are excluded. Mortgage insurance is included only as the entered quote; premium calculation and automatic cancellation are excluded.
- The estimate does not include local tax rules.
- This is planning math, not a quote.
Common questions
Why is total payment higher than principal and interest?
It includes the entered property taxes, homeowners insurance, HOA fees and any enabled monthly mortgage-insurance quote. The balance schedule covers principal and interest only.
Does this include closing costs?
No. There is no closing-cost or financed-fee input. Loan principal is calculated only as home price minus down payment. Compare upfront cash requirements and any financed charges with the lender’s Loan Estimate separately.
Can I enter a zero interest rate?
Yes. The loan is then divided evenly across payments.
Does the loan-to-value ratio automatically add mortgage insurance?
No. The ratio describes principal relative to price. Enable mortgage insurance and enter a quoted monthly premium when it applies to your budget; this tool does not infer loan-program rules.
Sources & further reading
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