About the Mortgage Income Calculator
This mortgage income calculator works backwards from a home price to the gross income you need to qualify. It builds the full monthly housing payment lenders use — principal and interest, property tax, homeowners insurance, HOA dues and PMI if you put down less than 20% (PITI) — and then applies two debt-to-income (DTI) tests to find the minimum salary.
The front-end ratio compares your housing payment with gross monthly income; the traditional guideline is 28%. The back-end ratio adds car loans, student loans, credit card minimums and other monthly debts; the traditional guideline is 36%. Your required income is whichever test demands more. Many lenders go higher — conventional loans can approve back-end ratios up to 45% to 50% with strong credit, and FHA often allows 31%/43% or more — so you can change both limits.
Use it to answer “what salary do I need for a $400,000 house?”, to check whether a listing is realistic before you tour it, or to see how much a bigger down payment or paying off a car loan lowers the income you need. The chart shows how the required salary changes with interest rates.
With the default inputs, the gross annual income needed is $127,519.07. Change any value above to recalculate instantly.
How to use the mortgage income calculator
- 1Enter the home price, your down payment, the rate and the loan term.
- 2Add yearly property tax and insurance, monthly HOA dues and a PMI rate.
- 3Enter your other monthly debt payments.
- 4Keep the 28%/36% limits or set your lender’s ratios.
- 5Read the annual income needed and which DTI test decided it.
Formula and method
PITI is principal and interest from the standard amortization formula on the loan (price − down payment), plus one-twelfth of yearly property tax and insurance, monthly HOA dues and PMI (yearly PMI rate × loan ÷ 12) when the loan-to-value is above 80%.
The front-end test requires PITI to be no more than the housing ratio limit of gross monthly income, so the minimum income is PITI divided by that limit. The back-end test requires PITI plus other monthly debts to be within the total DTI limit. The larger of the two monthly incomes is the one you need, and it is multiplied by 12 for an annual salary.
- PITI
- Principal, interest, tax, insurance, HOA and PMI per month
- debts
- Other monthly debt payments
- front-end / back-end limit
- Maximum housing and total debt-to-income ratios (e.g. 28% and 36%)
Worked examples
$400,000 home with 10% down
A $360,000 loan at 6.5% costs $2,275.44 a month; with $400 of tax, $150 of insurance and $150 of PMI the payment is $2,975.44. Dividing by 28% needs $10,626.59 a month, while the 36% back-end test with $500 of debts needs $9,654.01, so the front-end test sets the income at about $127,519 a year.
$300,000 home, 20% down, $1,200 of other debts
The $240,000 loan costs $1,516.96 a month, and with tax and insurance the payment is $1,941.96. The back-end test, ($1,941.96 + $1,200) ÷ 36%, needs $8,727.68 a month, much more than the front-end requirement, so you need about $104,732 a year.
Same $400,000 home with FHA-style 31%/43% limits
Raising the limits to 31% and 43% lowers the required income: the housing payment of $2,975.44 ÷ 31% needs $9,598.21 a month, or about $115,178 a year.
Frequently asked questions
How much income do I need for a $400,000 house?+
With 10% down at 6.5%, typical taxes and insurance and the 28% rule, you need roughly $125,000 to $130,000 a year. A bigger down payment, lower rate or lender that allows higher ratios reduces that.
What is the 28/36 rule?+
It is a traditional guideline that housing costs should be no more than 28% of gross monthly income and all debt payments, including housing, no more than 36%. Many lenders now allow higher ratios for borrowers with good credit and reserves.
Do lenders use gross or net income?+
US mortgage lenders use gross income — pay before taxes and deductions. Self-employed borrowers are usually assessed on net business income from the last two years of tax returns.
What debt-to-income ratio do I need for a mortgage?+
Conventional loans generally allow a back-end DTI up to 45%, and up to 50% with strong compensating factors through automated underwriting. FHA guidelines start at 31% front-end and 43% back-end but often approve higher.
Does the required income include property tax and insurance?+
Yes. Lenders qualify you on the full PITI payment — principal, interest, property tax, homeowners insurance, plus HOA dues and mortgage insurance — so high-tax areas need noticeably more income for the same price.
Results are estimates for educational purposes and are not financial advice. Rates, fees and terms vary — confirm with your lender or a licensed advisor before making decisions.