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Mortgage Affordability Calculator

Use this mortgage affordability calculator to estimate how much house you can afford from income, debts, down payment, rate, loan term, property taxes, insurance, HOA, and debt-limit assumptions.

Method and assumptions documentedPlanning estimateSource note includedNo expert review claimed

Live calculator

Mortgage affordability

Estimated affordable home price$298,977

Loan amount plus down payment using the entered payment limits.

Estimated loan amount$238,977

$1,550.00 available for principal and interest.

Max monthly housing payment$2,200.00

Lower of the housing-limit and total-debt-limit methods.

Affordability constraints

This shows which limit controls the estimate.

ConstraintMonthly amount
Monthly gross income$7,916.67
Housing limit$2,216.67
Total debt limit after debts$2,200.00
Taxes, insurance, HOA$650.00
Principal and interest$1,550.00

Use this as a mortgage planning estimate. Lender rules, verified income, credit profile, property taxes, insurance, HOA dues, PMI, reserves, and local costs can change the affordable price.

Which mortgage tool should I use?Start from the housing question you are trying to answer.
Mortgage paymentUse when you have a property price and want a monthly payment estimate.Mortgage affordability (this tool)Use when you know your income and debts and want a starting price range.Mortgage vs. rentUse when the open question is whether buying or renting fits better.

Quick answer

Mortgage Affordability Calculator: what it calculates

Mortgage Affordability Calculator estimates how much house you can afford from income, monthly debts, down payment, rate, loan term, taxes, insurance, HOA, and debt-limit assumptions. Use it to set a shopping range before checking a specific payment or rent-vs-buy comparison.

ResultAffordable home price
InputsAnnual income, Monthly debts, Down payment, Interest rate, Loan term, Monthly taxes, insurance, HOA, Housing limit, Total debt limit
FormulaMortgage affordability formula

Formula

Mortgage affordability formula

Affordable payment = min(gross monthly income x housing limit, gross monthly income x total debt limit - monthly debts); affordable price = loan amount from the remaining principal-and-interest budget + down payment

The calculator subtracts estimated monthly property taxes, homeowners or mortgage insurance, and HOA dues before estimating a loan amount from the remaining principal-and-interest budget.

How to use

Steps

  1. Enter annual household income and required monthly debt payments.
  2. Add down payment, interest rate, loan term, and monthly tax, insurance, and HOA assumptions.
  3. Adjust housing and total-debt limits to compare conservative and looser DTI rules.
  4. Use the affordable price as a shopping range, then test real listings in the mortgage payment and rent-vs-buy tools.

Example

Sample calculation

Annual income$95,000
Existing monthly debts$650
Monthly ownership costs$525 for taxes, insurance, and HOA
Payment capLower of housing-limit and total-debt-limit methods
Estimated affordable priceAbout $360k
Next checkRun the listing through mortgage payment and mortgage-vs-rent

Calculator use

Best for

  • Estimating an affordable home price range from income, monthly debts, down payment, interest rate, and loan term.
  • Comparing the housing-payment limit with the total-debt limit before shopping for a mortgage.
  • Checking how taxes, homeowners insurance, HOA dues, and PMI reduce the principal-and-interest budget.
  • Preparing a planning number before a lender reviews verified income, credit, reserves, and property details.

Before relying on it

Check first

  • Treating the result as mortgage approval, a loan estimate, or a guarantee that a lender will use the same debt limits.
  • Leaving out property tax, homeowners insurance, HOA dues, PMI, local fees, existing debts, or credit assumptions.
  • Comparing home prices without using the same down payment, rate, term, tax, insurance, and debt inputs.
  • Ignoring the gap between a planning rule and local lender, property, or insurance requirements.

Details

What to know before using the result

Budget methodLower of two limits

The estimate compares a housing-payment limit with a total-debt limit, then uses the lower monthly budget for the home-price estimate.

Payment componentsMore than principal and interest

Property taxes, homeowners insurance, mortgage insurance, HOA dues, and local costs can reduce the principal-and-interest budget.

Approval gapPlanning estimate only

A lender may use different loan-program limits, credit rules, reserves, property details, and verified income or debt figures.

Regional contextU.S. mortgage planning

The calculator uses common U.S. concepts such as DTI limits, property taxes, mortgage insurance, and HOA dues. Loan rules and ownership costs vary by program and location.

Next decisionPayment, DTI, or rent-vs-buy

After finding a range, use the mortgage calculator for a specific listing, the DTI calculator for debt pressure, and the mortgage-vs-rent calculator if buying versus renting is still open.

Source notes

References used for this calculator

Consumer Financial Protection BureauExplains debt-to-income ratio and why monthly debt payments are compared with gross monthly income.Consumer Financial Protection BureauHomebuyer guidance notes that taxes, insurance, mortgage insurance, and HOA fees can affect monthly housing cost.

Benchmarks

How to read the result

28% housing: Common planning rule.

Keeps housing costs near 28% of gross monthly income.

36% total debt: Conservative DTI check.

Includes housing plus recurring debt payments.

Local costs: Can move the result.

Taxes, insurance, HOA, and rates can change the affordable price quickly.

Calculator accuracy

Methodology and assumptions

Formula

Affordable payment = min(gross monthly income x housing limit, gross monthly income x total debt limit - monthly debts); affordable price = loan amount from the remaining principal-and-interest budget + down payment

Inputs used

Annual income, Monthly debts, Down payment, Interest rate, Loan term, Monthly taxes, insurance, HOA, Housing limit, Total debt limit

Limitations

Mortgage affordability estimates use visible income, debt, down payment, rate, term, housing-limit, and total-debt-limit assumptions. They do not replace lender underwriting, loan estimates, tax/insurance quotes, credit review, or property-specific costs.

Review record

Method and sources checked on July 13, 2026. The documented method, source timing, validity conditions, and reliance limits were checked on this date.

Method provenanceEstimate · toolkitshelf.mortgage-affordability-budget.v1
Maintained by
Toolkit Shelf
Calculation class
Estimate
Method version
toolkitshelf.mortgage-affordability-budget.v1
Source date
Current guide; accessed July 13, 2026
Source checked
July 13, 2026
Intended audience
Prospective homebuyers testing a housing-budget scenario from income, debts, down payment, rate, term, ownership costs, and self-selected debt-ratio limits.
Valid when
The estimate assumes the entered gross income, debts, down payment, fixed rate, term, taxes, insurance, HOA, and front-end and back-end limits are complete. PMI, closing costs, maintenance, reserves, and lender adjustments are not automatically added.
Reliance boundary
This is not mortgage preapproval, lender underwriting, a property valuation, an interest-rate quote, or a recommendation that the maximum estimated price is affordable for the household.
Data freshness
The CFPB guidance on total monthly housing costs and maintaining a budget cushion was checked on July 13, 2026. Users supply the rate, costs, and debt-ratio limits.
Cite this page

Toolkit Shelf. Mortgage Affordability Calculator. https://toolkitshelf.com/tools/mortgage-affordability-calculator

FAQ

Common questions

How much house can I afford?

A rough estimate starts with income, existing debts, down payment, interest rate, loan term, and monthly taxes, insurance, and HOA costs.

Does this replace mortgage preapproval?

No. This is a planning estimate. Lenders use credit, income documentation, loan program rules, assets, debts, and property details.

Why do taxes and insurance matter?

They are part of the monthly housing payment, so higher taxes or insurance leave less room for principal and interest.

What inputs matter most for mortgage affordability?

Income, monthly debts, down payment, rate, term, property tax, insurance, HOA dues, and PMI usually move the affordable home price the most.

Is this the same as lender approval?

No. A lender can use different debt limits, verified income, credit rules, reserves, loan-program requirements, and property-specific costs.

Why can local costs change affordability?

Property taxes, homeowners insurance, HOA dues, and PMI vary by location and property, so the same income can support different home prices in different markets.