{"success":true,"version":"v1","request":{"tool":"get_calculator_schema","calculator_id":"mortgage-payment"},"result":{"entity_type":"calculator","id":"mortgage-payment","calculator_id":"mortgage-payment","canonical_url":"https://tttkmbb.com/finance/mortgage-payment","name":"Mortgage Payment Calculator","title":"Mortgage Payment Calculator – Principal & Interest, Taxes, Insurance and HOA (PITI)","category":"finance","category_name":"Finance","tool_name":"calculate_mortgage_payment","featured_mcp_tool":true,"description":"Computes the monthly principal-and-interest payment of a fixed-rate mortgage from home price, down payment, rate and term, then adds property tax, home insurance and HOA dues to give the full monthly housing payment and lifetime interest.","use_when":"You want the monthly cost of buying a home with a fixed-rate mortgage, including escrowed taxes and insurance, or the total interest over the loan.","do_not_use_when":"The loan is adjustable-rate or interest-only, or you only need the payment on a plain loan amount (use loan-payment).","inputs":[{"name":"home_price","label":"Home price","type":"number","required":true,"max":1000000000000,"exclusive_min":0,"description":"Purchase price of the property.","example":250000},{"name":"down_payment","label":"Down payment","type":"number","required":false,"default":0,"min":0,"max":1000000000000,"description":"Cash paid up front; loan_amount = home_price − down_payment. For 20 % of a 250,000 home enter 50000.","example":50000},{"name":"annual_rate_percent","label":"Annual interest rate","type":"number","unit":"%","required":true,"min":0,"max":100,"description":"Fixed note rate in percent; the monthly rate is this / 12.","example":6},{"name":"term_years","label":"Term","type":"number","unit":"years","required":false,"default":30,"max":50,"exclusive_min":0,"description":"Loan term in years (30 and 15 are the common US terms).","example":30},{"name":"annual_property_tax","label":"Annual property tax","type":"number","required":false,"default":0,"min":0,"max":1000000000,"description":"Yearly property tax; one twelfth is added to the monthly payment.","example":3000},{"name":"annual_home_insurance","label":"Annual home insurance","type":"number","required":false,"default":0,"min":0,"max":1000000000,"description":"Yearly homeowners insurance premium; one twelfth is added monthly.","example":1200},{"name":"monthly_hoa","label":"Monthly HOA dues","type":"number","required":false,"default":0,"min":0,"max":10000000,"description":"Monthly homeowners-association or condo fee.","example":0}],"outputs":[{"name":"loan_amount","label":"Loan amount","type":"number","decimals":2,"description":"home_price − down_payment."},{"name":"loan_to_value_percent","label":"Loan-to-value","type":"number","unit":"%","decimals":2,"description":"loan_amount / home_price × 100; above 80 % usually requires mortgage insurance (PMI)."},{"name":"monthly_principal_and_interest","label":"Principal & interest","type":"number","decimals":2,"description":"Level monthly amortizing payment on the loan."},{"name":"monthly_property_tax","label":"Property tax (monthly)","type":"number","decimals":2,"description":"annual_property_tax / 12."},{"name":"monthly_insurance","label":"Insurance (monthly)","type":"number","decimals":2,"description":"annual_home_insurance / 12."},{"name":"monthly_hoa_fee","label":"HOA (monthly)","type":"number","decimals":2,"description":"monthly_hoa as entered."},{"name":"total_monthly_payment","label":"Total monthly payment","type":"number","decimals":2,"description":"Principal & interest + tax + insurance + HOA (PITI + HOA)."},{"name":"number_of_payments","label":"Number of payments","type":"integer","decimals":0,"description":"12 × term_years."},{"name":"total_interest","label":"Total interest","type":"number","decimals":2,"description":"Interest paid over the full term."},{"name":"total_of_payments","label":"Total principal & interest paid","type":"number","decimals":2,"description":"monthly_principal_and_interest × number_of_payments."},{"name":"payoff_summary","label":"Payoff summary","type":"string","decimals":4,"description":"Plain-language summary of the loan schedule."}],"input_schema":{"type":"object","properties":{"home_price":{"description":"Purchase price of the property.","type":"number","maximum":1000000000000,"exclusiveMinimum":0,"examples":[250000]},"down_payment":{"description":"Cash paid up front; loan_amount = home_price − down_payment. For 20 % of a 250,000 home enter 50000.","type":"number","minimum":0,"maximum":1000000000000,"default":0,"examples":[50000]},"annual_rate_percent":{"description":"Fixed note rate in percent; the monthly rate is this / 12. Unit: %.","type":"number","minimum":0,"maximum":100,"examples":[6],"x-unit":"%"},"term_years":{"description":"Loan term in years (30 and 15 are the common US terms). Unit: years.","type":"number","maximum":50,"exclusiveMinimum":0,"default":30,"examples":[30],"x-unit":"years"},"annual_property_tax":{"description":"Yearly property tax; one twelfth is added to the monthly payment.","type":"number","minimum":0,"maximum":1000000000,"default":0,"examples":[3000]},"annual_home_insurance":{"description":"Yearly homeowners insurance premium; one twelfth is added monthly.","type":"number","minimum":0,"maximum":1000000000,"default":0,"examples":[1200]},"monthly_hoa":{"description":"Monthly homeowners-association or condo fee.","type":"number","minimum":0,"maximum":10000000,"default":0,"examples":[0]}},"additionalProperties":false,"required":["home_price","annual_rate_percent"]},"output_schema":{"type":"object","properties":{"loan_amount":{"description":"home_price − down_payment.","type":"number"},"loan_to_value_percent":{"description":"loan_amount / home_price × 100; above 80 % usually requires mortgage insurance (PMI). Unit: %.","type":"number","x-unit":"%"},"monthly_principal_and_interest":{"description":"Level monthly amortizing payment on the loan.","type":"number"},"monthly_property_tax":{"description":"annual_property_tax / 12.","type":"number"},"monthly_insurance":{"description":"annual_home_insurance / 12.","type":"number"},"monthly_hoa_fee":{"description":"monthly_hoa as entered.","type":"number"},"total_monthly_payment":{"description":"Principal & interest + tax + insurance + HOA (PITI + HOA).","type":"number"},"number_of_payments":{"description":"12 × term_years.","type":"integer"},"total_interest":{"description":"Interest paid over the full term.","type":"number"},"total_of_payments":{"description":"monthly_principal_and_interest × number_of_payments.","type":"number"},"payoff_summary":{"description":"Plain-language summary of the loan schedule.","type":"string"}}},"formula":"loan_amount = home_price − down_payment; i = annual_rate_percent / 1200; n = 12·term_years; P&I = loan_amount × i / (1 − (1 + i)^−n) (loan_amount / n if i = 0); total_monthly_payment = P&I + annual_property_tax/12 + annual_home_insurance/12 + monthly_hoa.","method":"Standard fixed-rate amortization with monthly compounding. Private mortgage insurance, closing costs and escrow cushions are not included; add PMI (typically 0.5–1.5 % of the loan per year) to the total when loan_to_value_percent exceeds 80 %.","sources":[{"name":"CFPB – Owning a Home: loan costs and monthly payment components","url":"https://www.consumerfinance.gov/owning-a-home/","type":"government","retrieved_at":"2026-09-23"},{"name":"Wikipedia – Amortization calculator (annuity payment formula)","url":"https://en.wikipedia.org/wiki/Amortization_calculator","type":"reference","retrieved_at":"2026-09-23"}],"freshness":{"type":"static","max_age_seconds":null,"note":"Deterministic formula with fixed constants; results never go stale. Inputs supplied by the caller determine the output."},"examples":[{"name":"250,000 home, 50,000 down, 6 % for 30 years, 3,000 tax, 1,200 insurance","inputs":{"home_price":250000,"down_payment":50000,"annual_rate_percent":6,"term_years":30,"annual_property_tax":3000,"annual_home_insurance":1200},"expected":{"loan_amount":200000,"loan_to_value_percent":80,"monthly_principal_and_interest":1199.1,"monthly_property_tax":250,"monthly_insurance":100,"total_monthly_payment":1549.1,"number_of_payments":360,"total_interest":231676.38,"total_of_payments":431676.38},"url":"https://tttkmbb.com/api/v1/calculate/mortgage-payment?home_price=250000&down_payment=50000&annual_rate_percent=6&term_years=30&annual_property_tax=3000&annual_home_insurance=1200"},{"name":"400,000 home, 80,000 down, 6.5 % for 30 years","inputs":{"home_price":400000,"down_payment":80000,"annual_rate_percent":6.5,"term_years":30},"expected":{"loan_amount":320000,"monthly_principal_and_interest":2022.62,"total_monthly_payment":2022.62,"total_interest":408142.36},"url":"https://tttkmbb.com/api/v1/calculate/mortgage-payment?home_price=400000&down_payment=80000&annual_rate_percent=6.5&term_years=30"}],"faq":[{"q":"What does PITI mean?","a":"Principal, Interest, Taxes and Insurance: the four components lenders count as the housing payment. total_monthly_payment is PITI plus any HOA dues."},{"q":"Why is my lender's quote slightly different?","a":"Lenders round the payment to cents, may include PMI or an escrow cushion, and property tax and insurance change every year while this calculator holds them constant."},{"q":"How does a 15-year term compare?","a":"Set term_years=15: the monthly payment rises but total interest falls sharply (200,000 at 6 % costs 231,676 interest over 30 years but 103,788 over 15 years)."}],"tags":["mortgage payment","piti","home loan","monthly mortgage","property tax","total interest"],"related":[{"calculator_id":"loan-payment","reason":"Bare amortization without taxes and insurance."},{"calculator_id":"debt-payoff","reason":"See how extra monthly payments shorten the loan."},{"calculator_id":"compound-interest","reason":"Compare with investing the down payment instead."}],"links":{"html":"https://tttkmbb.com/finance/mortgage-payment","markdown":"https://tttkmbb.com/finance/mortgage-payment.md","json":"https://tttkmbb.com/finance/mortgage-payment.json","api":"https://tttkmbb.com/api/v1/calculate/mortgage-payment","schema":"https://tttkmbb.com/api/v1/calculators/mortgage-payment","openapi":"https://tttkmbb.com/openapi.json","mcp":"https://tttkmbb.com/mcp"},"version":"v1","updated_at":"2026-09-23"},"timestamp":"2026-09-23T23:31:10Z"}