Home Affordability Calculator

Mortgage lenders use the 28/36 rule as a guideline: housing costs (PITI) up to 28% of gross income, total debt up to 36% of gross income. On a $100,000 income, that's $2,333/month for housing. But this is a maximum, not a target — and using it as a target leads to financial strain.

The true affordability formula uses three layers of constraint:

Worked example — $100,000 gross income, 24% effective tax rate:

• Lender max (28%): $2,333/month → supports $360,000 home at current rates
• Comfortable max (25%): $2,083/month → supports $315,000 home
• Take-home reality (33% of $5,500/mo net): $1,815/month → supports $275,000 home

The "comfortable max" produces a home that feels affordable on a normal month. The "lender max" feels affordable when nothing goes wrong — but a $2,000 car repair, an unexpected medical bill, or a brief income disruption pushes the household into stress.

Why the 28/36 rule is too aggressive in 2026:

• The rule was developed when interest rates were 5-7% — comparable to today, but property tax and insurance were lower as a % of home value
• Healthcare costs have grown faster than wages — household budgets have less slack now
• Student loan debt loads are higher (median $39,633 per Department of Education) — already consumes part of the 36% debt allowance before adding mortgage
• Childcare costs have outpaced inflation by 30%+ — for households with children, the 28% housing target is already strained by daycare alone

Geographic adjustment: The 28/36 rule was developed for moderate-cost markets. In high-cost coastal cities (NYC, SF, LA, Boston), local norms have stretched the rule to 35-40% out of necessity — but this means accepting that retirement saving and emergency fund building will be slower. The rule should not be relaxed lightly.

Comparing the same $400,000 home with different down payment levels (assuming 6.30% rate, 30-year):

The 20% threshold matters because PMI ends. But on conventional loans, PMI is removable when the loan balance reaches 80% LTV — which happens automatically through amortization (typically 7-11 years on a 30-year mortgage starting at 95% LTV) or sooner if you make extra principal payments or if home values rise.

The opportunity cost calculation: the $60,000 difference between 5% down and 20% down could earn 7% annually in the stock market over a long horizon. On 10 years, that's $66,000 of foregone investment returns. Compare this to the PMI cost over the same period (~$25,000-$35,000) — the opportunity cost can exceed the PMI savings significantly.

FHA loans are different: FHA mortgage insurance (MIP) lasts the life of the loan in most cases, not removable at 80% LTV. The only exit is refinancing to a conventional loan once you have 20% equity. This makes FHA more expensive long-term than conventional with PMI for many borrowers — run the numbers carefully.

Special programs to know about:

• VA loans — no down payment required for eligible veterans, no PMI ever, lower rates than conventional
• USDA loans — no down payment for rural/suburban properties meeting income limits
• Doctor/professional loans — 0-5% down with no PMI for MDs, dentists, attorneys, CPAs at participating banks
• State first-time buyer programs — down payment assistance grants, often $5K-$25K, vary by state
• Conventional 97 — Fannie Mae/Freddie Mac 3% down option for first-time buyers, lower MIP than FHA

The "save longer" tradeoff: if you have 10% saved and could buy now (with PMI) or wait 18 months to save 20%, run both scenarios. In rising-price markets, buying now usually wins because home appreciation outpaces PMI cost. In flat markets, waiting can pay off. Mortgage interest rates also matter — a rate decrease while you save can offset the price increase.

Maximum home price by income, using these assumptions:

• 30-year fixed at 6.30% (current 2026 average)
• 20% down payment
• Property tax: 1.1% of home value (national average)
• Homeowners insurance: 0.35% of home value
• HOA: $0
• 28% gross housing ratio (lender max)
• 25% gross housing ratio (comfortable target)

The income-to-price multiplier: at current rates with 20% down, your maximum home price is approximately 3.7x annual income (lender max) or 3.3x annual income (comfortable target). This is significantly lower than the 4-5x multiplier that prevailed during the 3-4% rate era of 2010-2021.

Adjusting for higher property tax states: If property tax is 2% (Texas, New Jersey, Illinois), reduce these numbers by approximately 8-12%. If property tax is 0.4% (Hawaii, Alabama, Louisiana), increase by 5-7%.

Adjusting for HOA fees: Each $100/month in HOA fees reduces your max home price by approximately $14,000-$17,000.

Adjusting for existing debt: The 36% total debt rule means existing payments (car, student loans, credit cards) reduce mortgage capacity. A $400/month student loan payment reduces home buying capacity by approximately $63,000.

Local vs national affordability gap: these national tables assume median property tax and insurance. In high-cost coastal cities, the same income often can't reach the home price the calculator says — because property tax in NYC, NJ, IL is double national average, and insurance in FL, CA wildfire zones, or coastal hurricane areas is 2-4x national average.

Same $100,000 income, 28% housing ratio, 20% down, but varying interest rates:

From 6% to 7% — a single percentage point — drops your maximum home price by $35,000. From 6% to 8%, you lose $70,000 of buying power.

The compounding effect on monthly payment:

• $300,000 loan at 6%: $1,799/month P&I
• $300,000 loan at 7%: $1,996/month P&I (+$197/month)
• $300,000 loan at 8%: $2,201/month P&I (+$402/month vs 6%)

That $402/month difference between 6% and 8% is $144,720 over the life of a 30-year loan — an entire down payment on a different house.

What moves rates in the short term:

• Federal Reserve policy — rate cuts/hikes affect short-term rates first, but mortgage rates (10-year treasury-driven) move more on inflation expectations than Fed direct action
• 10-year Treasury yield — most direct correlation with 30-year mortgage rates (typically a 1.7-2.0% spread above the 10-year Treasury)
• Inflation data — rising CPI means rates rise; falling CPI means rates fall
• Mortgage-backed securities demand — when investors buy more MBS, mortgage rates fall; when they sell, rates rise
• Credit risk premiums — your individual credit score, loan size, and property type all affect your rate independently of market rates

The refinance optionality factor: a high-rate purchase isn't permanent. You can refinance when rates drop (typically 1+ percentage point lower triggers the math). The cost is closing costs ($4,000-$8,000) and paperwork; the benefit is monthly savings for the rest of the loan term. Many homeowners refinance 2-3 times over the life of a 30-year loan.

Rate locking strategy: when you have an accepted offer, lock the rate immediately (typically 30-60 day lock). Rate locks with float-down options (lets you re-lock at lower rate if rates drop) cost slightly more but provide insurance against the lock window. In rising-rate environments, locks are essential.

For a $400,000 home with 20% down, the actual cash needed at closing breaks down approximately like this:

So a buyer targeting a $400,000 home with 20% down should have roughly 27% of home price in liquid cash before starting the search — not just the 20% down payment.

The forgotten emergency cushion: after closing, you've drained most of your savings. A water heater fails in month 2 ($2,000), the HVAC needs replacing in year 1 ($8,000), property tax is reassessed up. Without a 3-month housing reserve held back from the purchase, these become credit card events.

Closing costs by line item on a typical $400,000 purchase:

• Lender fees ($1,500-$3,500): origination fee, underwriting fee, application fee — most negotiable
• Third-party fees ($1,200-$2,500): appraisal, credit report, flood determination, tax service
• Title fees ($1,500-$4,000): title search, lender's title insurance, owner's title insurance, settlement fee
• Government fees ($500-$3,000+): recording fees, transfer tax (varies wildly by state)
• Prepaid items ($2,000-$4,000): property tax escrow, insurance prepaid, daily interest from closing date to month-end

Geographic variation: closing costs vary 3x or more across states.

• Highest: NY, DC, DE, PA, MD — transfer taxes can add 2-3% of home price alone
• Lowest: MO, IN, KY, NE, SD — minimal transfer taxes, modest title insurance
• California: moderate (no state transfer tax in most counties, but high title insurance)
• Florida: moderate (documentary stamp tax 0.7% of price)

Cash strategies for cash-light buyers:

• Lender credits: accept a slightly higher interest rate (0.25-0.5% extra) in exchange for the lender covering some closing costs. Useful if you'll refinance within 5 years
• Seller concessions: negotiate the seller covering 1-3% of closing costs in lieu of price reduction
• Rolling into loan: some closing costs can be added to the loan amount (increases monthly payment slightly but reduces cash need)
• Down payment assistance programs: state/local first-time buyer programs offering grants or forgivable loans for down payment

The 36% rule covers total monthly debt — not just the mortgage. So existing debt comes off the top of your mortgage capacity, dollar for dollar:

For a household with $45K in student loans and a typical car loan, the mortgage capacity loss is ~$149,000 — meaning a $100,000 income that could otherwise buy a $370,000 home can only buy a $221,000 home.

The case for paying off small debts first. A $5,000 credit card balance with $150/month minimum payment costs you $25,000 of mortgage capacity. Paying off that balance with $5,000 cash recovers $25,000 of buying power — a 5x leverage ratio on the cash. This is one of the highest-return uses of cash for someone preparing to buy a home.

The case for NOT paying off student loans aggressively. A $50,000 student loan at 5% interest with $530/month standard payment looks like it's costing you $89,000 of mortgage capacity. But:

• Paying it off requires $50,000 in cash that could be down payment
• 5% interest is below most mortgage rates, so the "rate arbitrage" actually favors keeping the loan
• Federal student loans have death/disability discharge that mortgages don't
• Income-driven repayment plans can reduce the monthly payment dramatically (which improves DTI without paying off)

For high-interest debt (credit cards, payday loans, anything above 8%), pay off before buying. For low-interest debt (federal student loans below 6%, car loans below 6%), the math is more nuanced.

How lenders calculate DTI on student loans: this varies by program.

• Conventional Fannie/Freddie: use actual monthly payment if it's a fixed amount; if you're on IDR with $0 payment, use 0.5% of balance
• FHA: minimum of actual payment OR 0.5% of balance (recently changed from 1%, helping IDR borrowers)
• VA: 5% of balance divided by 12 (so $50K balance = $208/month for DTI)
• USDA: 1% of balance per month for IDR borrowers ($50K = $500/month)

Credit card pay-down strategy before mortgage application: credit utilization affects both your DTI AND your credit score. Paying credit cards below 10% utilization 30-60 days before mortgage application can improve your credit score by 20-50 points and reduce your DTI — both helping affordability.

"First-time buyer" doesn't always mean what you think — most programs define it as anyone who hasn't owned a primary residence in the last 3 years. So someone who owned a home a decade ago, sold it, and is buying again often qualifies.

Federal programs:

• FHA loans — 3.5% down with 580+ FICO score, up to $498,257 in standard areas (2026 limits, higher in high-cost areas). MIP for life of loan in most cases.
• VA loans — 0% down for eligible veterans, no PMI ever, lower rates. $0 down up to county limit (typically $766,550 in standard areas, higher in high-cost counties).
• USDA Rural Development loans — 0% down for properties in eligible rural/suburban areas. Income limits apply (typically up to 115% of area median).
• Conventional 97 — Fannie Mae/Freddie Mac 3% down option for first-time buyers. PMI required but removable at 80% LTV. No income limit (except in HomeReady/Home Possible variations which have income caps but offer reduced PMI).

State-level programs (varies dramatically by state):

This is a sampling — most states have multiple programs with different eligibility (income, occupation, location). The Department of Housing and Urban Development maintains a state-by-state directory at hud.gov.

Local/city programs often layer on top of state programs:

• NYC HomeFirst — up to $100,000 forgivable for buyers under area median income
• Philadelphia Home Buy Now — $10,000-$20,000 grants
• Atlanta INVEST Atlanta — up to $15,000 DPA
• Chicago Building Neighborhoods — varies by neighborhood, up to $20,000

Profession-specific programs:

• Good Neighbor Next Door (HUD) — 50% off home price for teachers, firefighters, police, EMTs in revitalization areas
• Doctor/Physician loans — 0-5% down, no PMI, special rate tiers for MDs, dentists, attorneys, CPAs at major banks
• Teacher Next Door — grants and lower rates for educators
• Homes for Heroes — closing cost rebates for military, first responders, healthcare workers, teachers

Energy-efficient mortgage (EEM): if buying a home that needs energy upgrades, the EEM lets you finance those improvements into the mortgage and qualifies you based on lower projected utility bills. Useful for older homes needing HVAC, insulation, or windows.

How to apply: ask your loan officer specifically about state and local DPA programs in writing. Many loan officers default to standard FHA/Conventional and don't proactively offer DPA programs because they take more paperwork. You may need to find a lender who specializes in DPA — often a credit union or smaller bank rather than a big national lender.

The mortgage qualification ladder, in increasing order of credibility:

What sellers actually want to see: in 2026's market, pre-approval is the minimum table stakes. Sellers (and their agents) ignore offers that say "pre-qualified" — too easy to get, doesn't mean anything. A real pre-approval letter shows the lender has at least pulled credit, verified income with paystubs, and confirmed assets exist.

The "underwritten upfront" advantage: some lenders offer "fully underwritten approval" or "TBD-approved" before you've even found a house. This means your file has been reviewed by an underwriter (not just a loan officer); only the property-specific items remain (appraisal, title). With this, your closing time can drop to 14-21 days vs 30-45 days for standard pre-approval. Sellers in competitive markets value this significantly.

What can blow up a pre-approval:

• Job change between pre-approval and closing — lenders re-verify employment within 10 days of closing. A new job (especially in a different field) can disqualify you.
• New debt — opening a new credit card, financing furniture, or buying a car between pre-approval and closing changes your DTI and triggers re-qualification
• Large unexplained deposits — gifts and large transfers need documentation. A $10,000 unexplained deposit looks like undisclosed debt
• Credit score drop — if your score drops between pre-approval and closing (often from increased utilization), the lender may re-quote at a higher rate
• Property issues — appraisal coming in below contract price, title problems, insurance issues (especially in flood zones or wildfire areas)

Multiple pre-approvals: getting pre-approved by 2-3 lenders before serious shopping is standard practice. The credit pulls are treated as a single inquiry by FICO if they're within 14-45 days (depends on FICO version). Comparison shopping for rate is encouraged and won't damage your score significantly.

Pre-approval expiration: typical pre-approvals are valid 60-90 days. After that, the lender will need updated paystubs, bank statements, and a fresh credit pull. If you've been house-hunting for months, refresh your pre-approval before submitting offers.

Pre-approval letters customized to home price: when submitting an offer, ask your loan officer to issue a pre-approval letter for the specific home price you're offering — not your maximum approval. This prevents the seller from knowing your maximum approved amount, which weakens your negotiating position.

What sellers actually evaluate in multiple-offer situations, in approximate order of weight:

1. Price — but with diminishing returns above 5% over asking
2. Type of financing — cash > conventional > FHA > VA in seller preference (though VA has gotten better acceptance)
3. Down payment size — larger down = stronger offer because appraisal gap risk is lower
4. Contingencies — fewer contingencies = stronger offer, but waiving protections is risky
5. Closing speed — 21 days closes faster than 45 days, often worth $5K-$15K to the seller
6. Earnest money — larger earnest money signals seriousness
7. Personal letters — controversial; some agents recommend, others say they're a fair-housing risk

The contingency tradeoffs:

The "appraisal gap clause" is the most common partial waiver. Instead of fully waiving the appraisal contingency, you commit to bringing additional cash up to a specific limit. Example: "Buyer agrees to bring up to $20,000 in additional cash if the appraisal comes in below the contract price." This shows competitiveness while limiting your exposure.

The "escalation clause" automatically raises your offer in $X increments above any other competing offer, up to a stated maximum. Example: "Offer escalates by $2,000 above any other bona fide offer, up to a maximum of $425,000." Used carefully, this lets you stay competitive without overpaying when there's no actual competition.

The "shortened due diligence" approach: instead of waiving the inspection contingency entirely, schedule the inspection BEFORE making the offer (a "pre-offer inspection"). You learn about major defects in advance, then waive the contingency in your offer. Sellers see this as nearly equivalent to no inspection contingency without you taking the full risk.

What NOT to do in competitive bidding:

• Waive the inspection contingency for older homes (40+ years) without a pre-offer inspection. The risk of major hidden defects (foundation, electrical, plumbing) is too high.
• Waive the financing contingency unless you have alternative financing or cash reserves to close the deal regardless of what your lender does.
• Bid more than 8-10% over comps without strong justification. The appraisal will likely come in low, requiring you to bring significant extra cash or restructure.
• Match earnest money to a percentage you can't lose. If 5% earnest money is required ($20,000 on a $400K home) and you can't afford to lose that if you walk for any reason, that's the wrong house.

The "best and final" round: when the listing agent calls for "best and final" offers, treat it as your single shot. Don't hold back to negotiate — the seller is choosing one offer to accept, not entering negotiation. Increase price meaningfully (typically 2-5% over your initial offer if you have room), tighten contingencies, and write a brief professional cover note.

Time-of-day matters: agents review offers as they arrive. Submitting your offer first thing in the morning or right at the listed deadline can both work — but submitting in the chaotic last hour with formatting errors definitely loses. Triple-check every form before submitting.

What happens to a fixed mortgage payment as time passes:

Assuming average wage growth of 3-3.5%, the same mortgage that consumes 30% of your income in year 1 only consumes 18% by year 15. Time is the homeowner's best friend — but only if you can survive year 1.

The "stretch but survive" decision: if you're young (under 35), in a career with strong income growth potential, and the housing market in your area is appreciating, a stretch purchase that's tight in year 1 but comfortable by year 5 can be the right move. The real risk is locking yourself into a property that becomes affordable in 3 years but is unsellable due to poor location or property issues.

The "comfort now, stretch later" alternative: buy modestly now (within 25% comfortable target), build equity and savings for 3-7 years, then upgrade to a larger home with the equity rolled forward. This trades immediate aspirational living for financial breathing room and reduced stress.

Property tax and insurance growth: while your mortgage P&I is fixed, your taxes and insurance are not.

• Property taxes typically grow 2-5% annually, with periodic reassessments creating step-changes (especially in California's Prop 13 regime, where reassessment only happens at sale)
• Homeowners insurance has been growing 5-10% annually since 2020 due to climate change and material costs — particularly steep in Florida, California wildfire zones, and gulf coast hurricane areas
• HOA fees (if applicable) typically rise 3-7% annually

A $400/month tax + insurance burden in year 1 can become $700-$900/month by year 15. So your "stable" PITI payment isn't entirely stable — about 30-40% of it grows with inflation.

Inflation as a wealth-builder for homeowners: inflation is bad for renters (rent goes up) and good for homeowners (mortgage payment is fixed in nominal dollars while income and asset values rise). Over a 30-year period, $2,477/month in 2026 dollars becomes the equivalent of about $1,040/month in 2026 purchasing power by 2056 (assuming 3% inflation). Your mortgage gradually shrinks in real terms.

The "house as forced savings" effect: the principal portion of your mortgage payment starts at about $480/month in year 1 ($2,477 P&I, 80% to interest) and grows to $1,840/month by year 25. By year 10, you've built roughly $60,000 of equity from principal alone, plus typically another $80,000-$120,000 from home appreciation in moderate markets. This forced savings effect explains why homeowners typically have 40x the net worth of renters at the same income level.

Plan for the "year 7-10 upgrade temptation." By year 7, your equity has grown substantially, your kids are older or starting school, and you're comparing to peers who upgraded. Resist trading up unless your income has genuinely caught up to support a larger payment. Many homeowners who could have been mortgage-free by year 18 instead reset to year 1 of a 30-year loan on a bigger house — and find themselves still paying mortgages in retirement.