Mortgage Affordability Calculator USA
See whether a target home price is actually comfortable — not just lender-approved on paper. The result separates safe housing budget, all-in payment, DTI pressure, cash-to-close risk, PMI drag, and the first thing likely to break.
Scope and official evidence See what HomeFit includes, excludes, and uses as planning evidence +
Included in the estimate
Fixed-rate principal and interest, property tax, homeowners insurance, editable PMI, HOA, recurring monthly debt, down payment, and an editable closing-cost assumption.
Outside the model boundary
Credit eligibility, lender overlays, reserves, utilities, maintenance, repairs, income stability, loan-level pricing, state-specific programs, FHA/VA/USDA rules, and final underwriting.
Official evidence used for the planning framework
The 28% comfort target, 36% front-end planning line, 43% back-end planning line, PMI bands, rate, tax, insurance, and closing-cost percentage are editable planning assumptions—not universal approval rules or lender quotes.
Test your home-price target
Build the household, cash, debt, and ownership-cost profile behind the price you are considering.
Run a realistic home-price test
Start with the home price you are actually considering, not the price you hope will work. A realistic target gives the HomeFit™ engine enough pressure to show the truth: whether the home is comfortable, stretched, risky, or not workable.
Enter annual household income and monthly debt payments. Debt matters because a mortgage can pass the housing-ratio test and still fail the back-end DTI test.
Enter the target home price and down payment. The dollar and percent fields sync automatically, so you can test either “I have this much cash” or “I want 10% down.”
Use a practical mortgage rate, property tax estimate, insurance estimate, HOA fee, and closing cost percent. For a specific home and location, calculate the property-tax estimate separately instead of relying only on a general percentage of the purchase price. These costs are often the difference between “approved” and “comfortable.”
Read the verdict first, then check the HomeFit™ Affordability Map. If the plan breaks, use the Best Fix and scenario cards before changing random inputs.
After you check affordability, compare the monthly payment in more detail with the Mortgage Payment Calculator USA, then test the cash side with the Down Payment Calculator USA.
Read the HomeFit verdict before the price
A “comfortable” result means the all-in housing payment fits the comfort target you selected and does not push total monthly debts into a dangerous range. It does not mean the loan is guaranteed, and it does not mean the home is cheap. It means the numbers leave a reasonable margin before housing starts crowding out the rest of your life. This verdict still focuses mainly on mortgage-side housing costs, so before treating the price as truly comfortable, calculate the full cost of owning the home with maintenance, repairs, utilities, and other ownership expenses included.
A “stretched” result is common. It usually means the home is not impossible, but the household needs discipline: fewer upgrades, stronger emergency cash, controlled debt, and a realistic repair budget. A stretched result becomes risky quickly if taxes, insurance, HOA, or PMI are higher than expected.
A “risky” or “not workable” result means the target price is being carried by approval math rather than comfort math. In that case, the first question is not “Can a lender approve this?” The better question is “What will break first?” HomeFit™ answers that by ranking payment pressure, DTI pressure, cash-to-close pressure, PMI pressure, tax/insurance pressure, and monthly debt pressure.
Change the lever that is actually failing
Use the calculator like a decision filter, not a permission slip. A lender may focus on maximum approval, but your household has to live with the payment after groceries, utilities, insurance, repairs, kids, commuting, debt payments, and savings.
Lower the target price before changing everything else. A smaller loan cuts principal, interest, taxes in many markets, PMI pressure, and cash-to-close at the same time.
The house may not be the only issue. Paying down a car loan or credit card minimum can improve back-end DTI faster than saving a small extra down payment.
Do not empty every dollar into the down payment. A buyer with no closing cushion can become fragile before the first mortgage payment is even due.
Compare a lower price, a larger down payment, and a PMI timeline. Use the PMI Removal Date Calculator USA if PMI is the main drag.
A good next move is to test the same home at a rate 1% higher. If you are considering an adjustable-rate mortgage, also stress-test the payment after the ARM rate resets instead of judging affordability only from the introductory rate. If the plan moves from stretched to risky, the price is probably too close to the edge unless income, down payment, or debt improves before closing.
Where an affordable-looking home breaks
The buyer who is approved but house poor
A household earns $100,000 and wants a $425,000 home with 10% down. The principal and interest payment might look manageable at first glance. But after property tax, insurance, PMI, HOA, and $500 of monthly debt, the all-in payment can push the plan into stretched territory. The lender may still continue the conversation; the household may feel the stress every month.
The decision is not only “Can we get the loan?” It is “Can we handle the payment and still keep cash for repairs, insurance increases, utilities, and savings?”
The buyer with enough income but too much debt
Someone with strong income can still fail the comfort test when car loans, credit card minimums, and personal loans are high. In that case, a bigger down payment may help less than reducing monthly debt. A $300 monthly debt reduction can sometimes move the back-end DTI more than several thousand dollars of extra cash down.
The buyer who forgets closing cash
A $40,000 down payment on a $400,000 home does not mean the buyer only needs $40,000. Closing costs can add thousands more before moving, repairs, furniture, utility setup, and emergency cash. A plan that uses every dollar for the down payment is not comfortable; it is brittle.
The buyer who is close — but rate-sensitive
If the plan only works at 6.75% but becomes risky at 7.75%, the target price is too dependent on timing. In that case, the safest fix is usually a lower price or higher down payment before locking into a contract.
Six blind spots that make a home look cheaper
P&I is not the full housing cost. Property tax, insurance, PMI, and HOA can add hundreds of dollars per month.
Approval math can stretch higher than a household should. The comfort target is there to protect monthly life, not maximize the loan.
PMI may be temporary, but it still affects the early years when the budget is usually tightest.
The first year often brings moving costs, repairs, tools, appliances, higher utility bills, and insurance adjustments.
A borderline plan can change fast if rates move before closing or if the final loan terms are weaker than expected.
Tax assessments and insurance premiums can rise. If the payment is already at the edge, those increases matter.
Inside the HomeFit reverse-affordability model
HomeFit™ starts with gross monthly income, then applies your selected comfort target to estimate a safe all-in housing payment. That comfort target is not the same as a lender’s maximum approval limit. It is the payment level the calculator treats as livable before monthly housing starts taking too much space from the rest of the budget.
annual household income ÷ 12
monthly gross income × comfort target %
home price − down payment
principal + interest + tax + insurance + PMI + HOA
all-in housing payment ÷ gross monthly income
(housing payment + monthly debts) ÷ gross monthly income
The mortgage payment uses the standard fixed-rate amortization formula. Property tax is estimated from the home price and annual property tax percent unless you edit the monthly tax directly. Home insurance works the same way: annual insurance is converted into a monthly amount unless you edit the monthly field. PMI is auto-estimated when the down payment is below 20%, unless you choose no PMI or enter a manual PMI amount.
The comfortable home price is solved in reverse. Instead of only asking “What payment comes from this price?”, the calculator asks “What home price would produce a payment close to the comfort limit after taxes, insurance, HOA, estimated PMI, and closing assumptions?” This is why the comfortable price may be lower than the target price even when the principal-and-interest payment alone looks reasonable.
Default household walkthrough
Suppose a household earns $100,000 per year, has $500 in monthly debt, wants a $400,000 home, puts 10% down, uses a 6.75% mortgage rate, estimates property tax at 1.10%, insurance at $1,800 per year, and has no HOA. The calculator estimates the mortgage payment, adds monthly taxes, insurance, PMI if needed, and compares the full housing cost to the 28% comfort target. It also checks back-end DTI and estimates closing cash using the selected closing cost percent.
Results are educational planning estimates. They are not a pre-approval, loan estimate, mortgage quote, financial advice, legal advice, or tax advice. Actual mortgage terms vary by lender, credit profile, reserves, loan type, location, property taxes, insurance premiums, HOA rules, PMI pricing, and market rates.
Questions buyers ask before treating a price as affordable
It depends on your debts, rate, down payment, property tax, insurance, PMI, HOA, and comfort target. A $100,000 household may be comfortable at one price and stretched at another even with the same income. The safer question is not only the maximum home price, but whether the all-in payment stays near a comfortable share of gross monthly income.
No. Lender approval focuses on whether the loan fits underwriting rules. Personal affordability asks whether the payment leaves enough room for normal life, savings, repairs, insurance changes, and unexpected costs. HomeFit™ separates comfort math from lender-stretched math for that reason.
The all-in payment includes estimated principal and interest, property tax, home insurance, PMI when applicable, and HOA dues if entered. It does not include utilities, repairs, maintenance, moving costs, furniture, or future tax and insurance increases. Those additional ownership expenses should be evaluated separately before treating the mortgage payment as the complete monthly housing cost.
PMI adds a monthly cost when the down payment is below 20% on many conventional loans. It may be temporary, but it still affects the early years of the mortgage when the budget is often tightest. If PMI is a major pressure point, test a larger down payment or use the PMI Removal Date Calculator USA.
A common comfort target is around 28% of gross monthly income for the all-in housing payment, but the right number depends on debt, household size, savings, location, and income stability. A household with no debts may handle more than a household already carrying car loans and credit card payments.
If the monthly payment breaks first, lowering the target price usually helps fastest because it can reduce loan size, taxes, PMI pressure, and closing costs together. If PMI is the main issue and you have extra cash without draining reserves, a larger down payment may help. If back-end DTI breaks first, reducing monthly debt may be the stronger fix.