Housing affordability is not one universal score. The National Association of Realtors’ Housing Affordability Index (HAI) estimates whether a median-income family could qualify for a mortgage under specific assumptions. The National Association of Home Builders’ Cost of Housing Index (CHI) estimates how much of median family income a modeled mortgage payment consumes. Census and HUD cost-burden measures describe what households actually spend relative to gross income.
Those measures answer different questions. To judge a purchase, use them as market context, then calculate the payment, debts, cash reserves, taxes, insurance, utilities and maintenance costs for your own household and the specific home.
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Why “affordable” can mean several different things
When a report says homes are becoming more or less affordable, first identify what is being measured. An index may describe mortgage qualification, a modeled payment share, or observed household spending. It may cover a national median, a metro area, renters, owners, a new home or an existing home. Its income denominator may be median family income, area median income or an individual household’s gross income.
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1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errorsThese choices can produce very different percentages without any contradiction. A buyer can see a favorable qualification index and still find that a particular home leaves too little money for childcare, student loans, repairs or savings. Conversely, a household may carry a high cost-to-income ratio for a period while remaining current on its mortgage. The figures are signals, not a personal approval or a complete financial plan.
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The three questions the major measures answer
| Measure | Main question | Typical population and denominator | Core cost assumptions |
|---|---|---|---|
| NAR Housing Affordability Index | Could a typical family qualify for a mortgage on a typical home? | Median family income compared with the income needed for a median-priced existing single-family home | 20% down; principal and interest limited to 25% of median monthly family income |
| NAHB/Wells Fargo Cost of Housing Index | What share of a typical family’s income would a modeled home payment consume? | Median family income; a separate version uses 50% of area median income for a low-income family | 10% down; mortgage payment includes property taxes, homeowners insurance and private mortgage insurance |
| HUD cost-burden convention and Census ratios | How much does a household actually spend on housing relative to gross income? | An individual renter or owner household | Monthly housing costs divided by gross monthly household income; included costs vary by tenure and Census definition |
Because the methods differ, do not rank one percentage against another without checking the home type, geography, date, income measure, down payment and included costs.
How the NAR Housing Affordability Index works
What the index represents
NAR describes the HAI as a national and regional measure of whether a typical family earns enough to qualify for a mortgage on a typical home, using recent price and income data. The typical home is a median-priced existing single-family home. The typical family is represented by median family income.
The methodology assumes a 20% down payment. It then calculates the income needed for a mortgage whose principal-and-interest payment is no more than 25% of median monthly family income. The index compares actual median family income with that required income.
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Interpreting 100 and values above or below it
- 100: Median family income is exactly sufficient for the modeled mortgage under the stated assumptions.
- Above 100: The modeled median-income family has more income than required for that qualification calculation.
- Below 100: The modeled median-income family has less income than required.
An HAI above 100 does not prove that every family can comfortably afford a home. The model does not know your credit profile, existing debts, down-payment savings, local property taxes, insurance premiums, maintenance budget or desired emergency reserve. It also assumes that a buyer has 20% available, which is not true for many households.
A simple illustration
Suppose a hypothetical household has $100,000 in annual family income, or about $8,333 per month before taxes. A 25% qualifying limit would produce a modeled principal-and-interest ceiling of about $2,083 per month. That arithmetic illustrates the ratio; it is not a lender quote and does not include taxes, insurance, PMI, utilities or other household obligations.
How the NAHB Cost of Housing Index works
What CHI includes
NAHB’s CHI expresses a modeled mortgage payment on a median-priced home as a share of median family income. Its mortgage scenario assumes a 10% down payment and adds property taxes, homeowners insurance and private mortgage insurance to the mortgage payment. That broader payment explains why CHI is not interchangeable with an HAI percentage based on 20% down and principal and interest alone.
NAHB also publishes a low-income version. In that method, the household is defined as having 50% of area median income. A high low-income CHI percentage indicates that the modeled payment consumes a large share of that group’s income; it is not a statement that every low-income buyer faces the same price or financing terms.
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- DEDICATED BUYER QUALIFYING KEYS: Enter client's income, debt and expenses to pre-qualify them to only show properties they can afford. Include tax, insurance and mortgage insurance then compare loan options and payment solutions to give your client choices before they make an offer to buy
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National Q2 2026 findings
NAHB reported these national modeled results for the second quarter of 2026:
| Household and home type | Share of income required |
|---|---|
| Typical family buying a median-priced new home | 34% |
| Typical family buying a median-priced existing home | 36% |
| Low-income family buying a median-priced new home | 67% |
| Low-income family buying a median-priced existing home | 71% |
These are national CHI results for Q2 2026, not payment quotes for a particular buyer. They use NAHB’s 10%-down methodology and its specified taxes, insurance and PMI assumptions. A 34% CHI should not be read as a 34% HAI or as a universal affordability limit.
Market context versus a household decision
In NAHB’s May 21, 2026 release about first-quarter results, NAHB Chairman Bill Owens said: “While affordability for both new and existing homes saw modest improvement over the past year, home buyers continue to grapple with elevated mortgage rates and economic uncertainty while home builders are dealing with rising construction costs, excessive regulations and labor shortages.” That is industry commentary surrounding the index, not an additional statistical threshold.
What the 30% and 50% housing-burden thresholds mean
HUD’s commonly used convention
HUD’s convention classifies a household as housing cost-burdened when it spends more than 30% of income on housing costs and severely cost-burdened when it spends more than 50%. The thresholds are useful for describing pressure across populations, but they are not mortgage-approval rules and do not establish a personal spending target.
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The Census Bureau defines the ratio as monthly housing costs divided by gross monthly household income, multiplied by 100. For homeowners, the costs can include mortgage payments, property taxes, insurance, utilities and other specified expenses. For renters, gross rent includes rent and utilities. The exact components and the population covered matter when interpreting the result.
A ratio above 30% can mean less flexibility after housing is paid, but two households with the same ratio may have very different remaining dollars. A household earning $45,000 and one earning $180,000 could each spend 35% while facing different options for food, transportation, healthcare and savings. Debt payments, dependents and irregular costs also matter.
A renter statistic that should not be misread
The Census Bureau reported that in 2023, 21 million renter households—49.7% of the 42.5 million renter households for which the calculation was made—spent more than 30% of income on housing costs. The statistic describes renters, not prospective homebuyers or homeowners. It should not be presented as the share of buyers who cannot afford a mortgage.
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How to compare an affordability figure correctly
Before saying that one city, quarter or home type is more affordable than another, check each of these dimensions:
- Question: Is the figure about qualification, a modeled payment share or observed spending?
- Population: Does it represent a median family, a low-income family, renters, owners or one household?
- Income denominator: Is it median family income, 50% of area median income, gross household income or another measure?
- Geography: Is it national, regional, metropolitan, county-level or tied to a specific address?
- Home and price basis: Is the price for a median existing single-family home, a median new home or the property you intend to buy?
- Down payment: NAR’s cited method uses 20%; NAHB’s CHI uses 10%.
- Included costs: Principal and interest alone produce a different result from a payment that adds taxes, insurance and PMI. Census ratios may also include utilities and other specified costs.
- Date: Monthly price or rate inputs, quarterly CHI releases and annual household surveys can describe different periods.
If a published table does not state these details, treat the number as incomplete context rather than a precise comparison.
How to apply the measures to your own purchase
1. Define the actual home and location
Start with the listing price or a realistic local price range, not a national median. Record the county or municipality because property taxes, insurance costs, assessments and utility charges can vary materially within the same metro area. Decide whether you are comparing new construction or an existing home; the national CHI results show that those categories can have different modeled burdens.
2. Build the complete monthly housing payment
Estimate principal and interest using the loan amount, term and rate you could actually obtain. Add property taxes, homeowners insurance, mortgage insurance if your down payment requires it, homeowners-association dues, and any recurring utility or service costs that your budget must absorb. A mortgage calculator can help explore principal-and-interest scenarios, but it cannot by itself reproduce every CHI component or determine whether the purchase is personally affordable.
3. Measure income conservatively
Use dependable gross income and document how bonuses, commissions, overtime or self-employment income are treated by the lender. Then calculate the housing share of gross income. For a household-budget decision, also review after-tax cash flow, because taxes and payroll deductions determine the money available for everyday spending.
4. Include debts and nonhousing obligations
List credit-card minimums, student loans, auto loans, child support, alimony, personal loans and other recurring commitments. A national index does not incorporate your debt-to-income profile. A lender may approve a payment that leaves less room than you want for savings or variable expenses.
5. Test cash and resilience
Account for the down payment, closing costs, prepaid taxes and insurance, moving expenses and an emergency reserve. Run a higher-tax, higher-insurance and repair scenario rather than relying only on the best estimate. If the payment works only when every assumption is favorable, the purchase is fragile even if a national index looks positive.
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- CONFIDENTLY AND EASILY SOLVE: Clients' financial questions whether they're buyers, sellers, investors or renters. Increase your perceived professionalism as a new agent, experienced broker or seasoned loan officer. Close more home sales and impress your clients with fast, accurate answers to all their real estate finance questions from PITI Payments to IRR, NPV and Cashflows
- DEDICATED BUYER QUALIFYING KEYS: Enter client's income, debt and expenses to pre-qualify them to only show properties they can afford. Include tax, insurance and mortgage insurance then compare loan options and payment solutions to give your client choices before they make an offer to buy
- FIGURE OUT THE RIGHT LOAN: For your client at the press of a button for jumbo, conventional, FHA/VA, or even 80:10:10 or 80:15:5 combo loans; check to see if ARMs or bi-weekly loans, quarterly payments or if interest-only payments are the answer; giving your client more choices; easily perform what if loan or TVM calculations find loan amount, term, interest or PITI or PI payments
- BECOME AN INVALUABLE RESOURCE: To your clients by reducing their confusion and uncertainty; ensuring they are able to make a purchase offer; knowing they can afford the down payment; and determining which is the right loan for them. Date-math for listings and contracts too. Comes with a protective slide cover, quick reference guide, pocket user's guide, and long-life battery
6. Use affordability indexes as a cross-check
Compare your result with the relevant regional HAI or CHI when available, while retaining each measure’s assumptions. The comparison can reveal whether your target market is broadly expensive relative to incomes, but it cannot replace underwriting or a household budget.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Common mistakes and how to correct them
Calling an HAI a “safe payment” score
Mistake: Treating an HAI above 100 as proof that a home is comfortable for you.
Correction: Describe it as a modeled qualification result based on median income, a median existing home, 20% down and a 25% principal-and-interest ratio.
Comparing CHI directly with HAI
Mistake: Saying a 36% CHI means the market is less affordable than an HAI of 100 because 36 is a larger-looking number.
Correction: CHI is a payment-share percentage with 10% down, taxes, insurance and PMI; HAI is an income-to-required-income index with 20% down and principal and interest only. They cannot be converted by simply comparing the displayed numbers.
Using the 30% rule as a lender rule
Mistake: Assuming a household above 30% will be denied or one below 30% is automatically safe.
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Mixing renters and buyers
Mistake: Recasting the 2023 Census renter statistic as a homeowner or homebuyer rate.
Correction: Keep the population label attached: 21 million renter households, or 49.7% of the 42.5 million renter households calculated, exceeded 30% in 2023.
Dropping the date and method
Mistake: Publishing a percentage without its quarter, year, home type or income definition.
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What lenders and affordability analyses may examine
Formal affordability analysis can model conventional and FHA financing and account for income, assets and liabilities. It can also show how interest-rate or down-payment changes affect a scenario. Those analyses are more individualized than a national median index, but they still depend on accurate documentation and assumptions. Ask the lender to identify the rate, loan type, term, cash required, mortgage insurance, taxes and insurance used in the estimate.
For a second opinion on budgeting or financing concepts, a housing counselor or homebuyer-education service may help you organize income, debts, reserves and loan choices. Verify the provider’s qualifications, fees and availability before sharing financial information or paying for assistance.
A practical decision checklist
- Have I identified whether the published number is HAI, CHI or a Census cost ratio?
- Do I know the geography, home type, income denominator and release date?
- What down payment does the model assume, and what cash will I actually have?
- Does the payment include taxes, insurance, PMI, utilities and association dues?
- What are my monthly debts after closing?
- How much emergency savings remains after the transaction?
- Would the budget survive a rate, tax, insurance or repair increase?
- Am I using a renter statistic or a homeowner statistic for the question I am asking?
The most useful conclusion is therefore specific: an affordability measure can show how a market or modeled household compares under a defined method, while only your complete cash-flow and financing analysis can show whether a particular home fits your life.
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