Mortgage Affordability Calculator (How Much House?)
Mortgage affordability calculator. Uses the 28/36 debt-to-income rule from gross income, monthly debts, and down payment. Shows max + recommended-safe home price plus a full PITI breakdown.
Mortgage Affordability Calculator
Monthly PITI breakdown @ max price
| Component | Monthly amount |
|---|---|
| P&I (principal + interest) | — |
| Property tax | — |
| Home insurance | — |
| HOA fees | — |
| Total monthly housing (PITI) | — |
How to use the mortgage affordability calculator
Enter your gross annual household income
Pre-tax household income — combined if dual-earner. This is the input lenders use for DTI calculations. Don't include unreliable income (one-time bonuses, side gigs without a 2-year track record, RSU vesting that may not continue). Include reliable base salary + commission + regular bonus + rental income with a 2-year track record. Lenders document this via W-2s, tax returns, and recent pay stubs.
Enter your monthly non-housing debt payments
Required monthly minimums on: car loans, student loans, credit cards (minimum payment), personal loans, alimony, child support. Don't include utilities, groceries, or current rent. These count against the 36% back-end DTI rule. Paying down credit-card balances before applying for a mortgage can materially improve max affordability — 1% lower DTI ≈ ~3-4% more home price.
Enter down payment, mortgage rate, and term
Down payment in dollars (the cash you bring to closing). Mortgage rate: current 30-year fixed for prime borrowers (check Bankrate, NerdWallet, or your lender) — mid-2026 sitting ~6.5-7.5%. Term: 30 years is standard (lower monthly payment, more interest); 15 years builds equity faster (higher payment, much less interest). 20-year terms are uncommon but exist.
Estimate property tax, insurance, and HOA
Property tax (% of home value, annual): varies wildly by US state — California ~0.7%, US average ~1.1%, Texas ~1.8%, New Jersey ~2.5%, Illinois ~2.1%. Look up effective rate by zip code. Home insurance: typically $1,200-$2,500/year for $400K homes — varies by state, hurricane/wildfire zones cost more. HOA: only for condos, townhomes, planned communities — single-family detached usually zero.
Read max + recommended-safe price
The calculator shows two numbers. Max price (28/36) is the lender's ceiling — strictly speaking your loan would be approved. Safe price (25%) is a more conservative threshold that leaves room for emergencies, retirement saving, lifestyle, and rate changes (if your ARM resets or refinance opportunity appears). Many financial advisors recommend aiming at the safe price, especially for first-time buyers. The PITI breakdown shows where each dollar of monthly housing cost goes.
How much house can you actually afford? The 28/36 rule, demystified
The first question every prospective home buyer asks is also the hardest: how much house can I afford? Lenders answer with the 28/36 debt-to-income (DTI) rule, the underwriting standard used by Fannie Mae, Freddie Mac, FHA, VA, and conventional mortgage lenders across the US. The math is simple — housing payment ≤ 28% of gross monthly income (front-end DTI), and total debt payments ≤ 36% of gross monthly income (back-end DTI) — but the implications are subtle. The lower of the two limits is binding. A high-income borrower with no other debt is limited by the 28% front-end ceiling; a moderate-income borrower with car payments and student loans is limited by the 36% back-end ceiling. This calculator runs both checks and shows which one binds.
Max price vs recommended safe price
The 28/36 ceiling is the lender\'s maximum — what they\'ll approve. It\'s not necessarily what you should buy. Financial advisors increasingly recommend a more conservative 25% front-end target, especially for first-time buyers. The reason: lenders\' underwriting models assume current rates persist, current income persists, current property tax doesn\'t rise, and that emergencies will be funded somehow. Real life isn\'t like that. A 25% PITI leaves room for 401(k) contributions, college savings, vehicle replacement, medical surprises, and refinance optionality if rates fall. The calculator surfaces both numbers so you can decide where you land between "what the bank approves" and "what lets you sleep at night."
The mortgage approval ceiling is what the bank will lend you. The recommended safe price is what won\'t wreck your retirement. The gap between them is usually 15-25% of home price.
The hidden costs that wreck affordability
Most affordability calculators show "monthly payment" as just principal + interest. That undercounts by 25-40%. Real monthly housing cost is PITI: Principal + Interest + Taxes + Insurance. Plus HOA fees for condos/townhomes/planned communities. Plus PMI (Private Mortgage Insurance) if your down payment is below 20%. Plus utilities, maintenance, and unexpected repairs. A $400K home in Texas with 1.8% property tax + $2,000 insurance = $755/month in T+I alone, on top of ~$2,400 P&I at 7%. The PITI is $3,150/month, not the $2,400 you\'d see on the lender\'s "monthly payment" line. Underestimating these is the #1 cause of post-purchase financial distress.
ASEAN context — different markets, different rules
For Singapore: HDB BTOs use a different framework — Mortgage Servicing Ratio (MSR) at 30% of gross monthly income for HDB flats, Total Debt Servicing Ratio (TDSR) at 55% for private property. CPF-backed financing extends affordability significantly. For Malaysia: Bank Negara DSR (Debt Servicing Ratio) caps housing + total debt at 70% for higher-income borrowers, 60% for moderate income. Property tax (cukai pintu/cukai tanah) is much lower than the US (~RM200-2000/year typical, not %). For Indonesia: Bank Indonesia BI-7DRR rate sets KPR (Kredit Pemilikan Rumah) mortgage rates; LTV caps vary by property location and buyer status. Bank Indonesia DTI guideline tops at 30% for housing payment. ASEAN markets have lower property taxes but higher mortgage rates than US — this calculator\'s 28/36 framing is US-centric but the methodology (housing payment ≤ % of income, total debt ≤ %) is universal.
10 Things to Know About Mortgage Affordability
28/36 rule: housing ≤ 28% of gross monthly income; total debt ≤ 36%. US conventional-loan underwriting standard since the 1970s.
FHA limits are looser: 31/43 ratios with mortgage insurance. VA loans have no fixed DTI but use residual-income methods.
Gross income, not net. The DTI calculation uses pre-tax income. Net (take-home) is what actually pays the mortgage — be honest with yourself about the difference.
PITI = Principal + Interest + Taxes + Insurance. Most "monthly payment" estimates show only P&I, undercounting real cost by 25-40%.
Property tax varies wildly by US state: CA ~0.7%, US avg ~1.1%, TX ~1.8%, NJ ~2.5%, IL ~2.1%. Same home, very different monthly cost.
Down payment below 20% triggers PMI, typically adding 0.3-1.5% of loan annually. Auto-cancels at 78% LTV per HOPA 1998.
For every 1% drop in mortgage rate, max affordable price rises ~10-12%. The 2022 rate jump (3% → 7%) cut affordability by ~30%.
15-year mortgages typically have 0.4-0.7% lower rates than 30-year. Higher monthly payment but ~60% less lifetime interest.
Lenders ask for 2 years of W-2s + tax returns. Self-employed: 2 years of Schedule C. Investment + rental income: 2-year track record required.
The 25% safe rule (housing ≤ 25% of gross): popular advisor recommendation. Leaves room for 401(k), college savings, and life — beats the lender\'s ceiling.
Frequently asked questions
-
Lenders use gross because tax + benefit deductions vary too much between borrowers. A single filer in Texas (no state income tax, no 401(k) contributions) takes home ~75% of gross. A married filer in California (high state tax) with a 15% 401(k) contribution takes home ~55%. Standardising on gross gives a consistent comparison framework. The reality: your take-home pays the mortgage, not gross — which is why the 25% conservative target (gross) is closer to a 35% net cost. Be honest about your actual take-home when deciding what feels comfortable.
-
Generally: the safe number. The max represents the lender\'s appetite for risk — they\'re fine if you live month-to-month because your loan is secured by the home. You should care about retirement saving, emergency reserves, and lifestyle. A 28% PITI is approvable but uncomfortable for most households. Aim for 25% or below if possible. Exception: high-income earners with secure jobs and existing savings can stretch closer to 28%; first-time buyers and self-employed should be more conservative (20-22%) to absorb income volatility.
-
This calculator uses the conventional-loan 28/36 standard. FHA loans are looser (31/43 typical), with explicit mortgage insurance premiums on top. VA loans (eligible veterans) use a residual-income method instead of strict DTI ratios and often allow zero down. USDA loans (rural areas) follow 29/41 with income limits and zero down. For all these special programs, you can use this calculator\'s max price as a starting point but consult a lender for product-specific approval. The conservative safe-price number stays valid regardless of loan program — it\'s about your finances, not the loan structure.
-
Three reasons. (1) PMI threshold: below 20% down, you pay Private Mortgage Insurance — 0.3-1.5% of loan annually, adding $80-400/month for typical loan sizes. (2) Lower loan = lower payment: more cash down means smaller loan principal, lower P&I. (3) Risk buffer: 20% down means even a 15% home-price decline doesn\'t put you underwater (loan > home value). The 2008 housing crash put millions of 5%-down buyers underwater; 20%-down buyers were mostly fine. Saving the 20% takes longer but materially reduces risk and total cost.
-
This calculator only computes the ongoing monthly cost. Closing costs are one-time fees at purchase: typically 2-5% of home price. Includes origination fees (0.5-1%), title insurance ($1K-$3K), appraisal ($400-$700), home inspection ($300-$500), property tax + insurance escrow (2-12 months prepaid), recording fees, and lender-specific fees. For a $400K home, expect $8K-$20K in closing costs on top of your down payment. Many buyers underestimate this — don\'t spend your last dollar of savings on the down payment. Hold back ~3% of home price for closing.
-
Hugely. For every 100bps (1%) rise in mortgage rate, max affordable home price falls ~10-12% (same income, same DTI). The 2022 rate cycle (3% → 7%, +400bps) cut max affordability by ~30%. A buyer who could afford $500K in 2021 could afford ~$355K at the new rate. Mid-2026 with rates stabilising 6-7%, affordability is recovering somewhat but still below 2021 peaks. Refinance optionality matters too — if rates fall meaningfully (>1% below your locked rate), refinancing can boost ongoing affordability without selling.
-
HOA (Homeowners Association) fees are treated as part of PITI for affordability purposes. A $350/month HOA reduces the loan you can afford by roughly $50K at 7% rates (because $350 in HOA = $350 less available for P&I). For condos, townhomes, and planned communities, HOA is typically $200-$600/month for standard developments, $600-$2,000+ for luxury or amenity-heavy buildings. Single-family detached homes usually have no HOA. Some properties also have special assessments — one-time HOA fees for capital projects like roof replacement, parking-lot repaving. Budget for these.
-
If you\'re going to stretch toward the 28% front-end ceiling rather than the 25% safe number, ensure (1) 6 months of full PITI in liquid emergency reserves; (2) job/income security for 3+ years; (3) intent to stay 5+ years (avoid closing-cost loss on early sale); (4) ability to handle 1-2 unexpected major repairs (water heater $1.5K, HVAC $7K, roof $15K); (5) you\'re still contributing meaningfully to retirement (15%+ of gross). If any of those fail, drop closer to the safe number.
-
No. Income, debt, down payment, rate — every input stays in your browser as client-side JavaScript. The calculation runs entirely on your machine: max PITI from 28/36, iterative property-tax adjustment, mortgage payment inversion. Open DevTools → Network when you click Calculate and you\'ll see zero outbound requests. Safe for confidential financial planning.
-
FNMA Selling Guide — definitive Fannie Mae underwriting standards (selling-guide.fanniemae.com). HUD Handbook 4000.1 — FHA loan underwriting. Consumer Financial Protection Bureau — free unbiased guides (consumerfinance.gov/owning-a-home/). Bankrate, NerdWallet — current rate environment and lender comparisons. For ASEAN-specific: MAS Singapore (mas.gov.sg) on MSR/TDSR; Bank Negara Malaysia (bnm.gov.my) on DSR caps; Bank Indonesia on KPR rules.
Related News
You may be interested in these recent stories from our newsroom.
-
Snowflake jumps 36 per cent in a day on an earnings beat and a US$6 billion AWS chip deal
Snowflake had its best day as a public company on 28 May, closing up 36 per cent after a clean first-quarter beat and a five-year, US$6 bill...
-
MAS Scraps Mandatory Financial Advice for Most Complex Product Buyers in Retail Shake-Up
Singapore retail investors buying structured notes, derivatives and investment-linked policies will no longer need mandatory financial advic...
-
SEC Rewrites Float Rules, PSE Moves to Implement Them — Clearing the Path for GCash's USD 1B Philippine IPO
The SEC lowered the public float floor for large Philippine issuers in February 2026. The PSE followed with a consultation paper in April. T...
75 more free tools
Calculators, converters, security tools — no signup.