How Much House Can I Afford in 2026? The Real Formula

There are two numbers when you’re buying a house: what the bank says you can afford, and what you can actually afford.

These numbers are almost never the same — and the gap between them is where financial stress lives.

Lenders calculate your maximum loan based on gross income (before taxes) and a debt-to-income ratio that sounds conservative but isn’t. They’re in the business of lending money. Your job is to figure out what a mortgage actually costs on a monthly, daily, real-life basis — and whether that leaves you with enough margin to live, save, and handle the surprises that homeownership always delivers.

This guide gives you both calculations: the bank’s formula and the real formula.

Disclosure: This post contains affiliate links. See our affiliate disclosure.

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Why the Bank’s Number Is the Wrong Number

Lenders use your gross income (pre-tax) and approve you based on a front-end debt-to-income (DTI) ratio of up to 28–31% for housing, and a back-end DTI of up to 43–50% for all debt combined.

The problem: You don’t live on gross income. You live on take-home pay — which is 65–75% of gross for most earners after federal tax, state tax, Social Security, Medicare, and benefits deductions.

Example:

• Gross household income: $120,000/year → $10,000/month
• Bank’s 28% front-end limit: $2,800/month for housing
• Actual take-home pay: ~$7,400/month (after taxes, benefits)
• $2,800 / $7,400 = 38% of your take-home pay going to housing

That’s not 28%. That’s 38% — and it doesn’t include utilities, maintenance, HOA fees, or the fact that your car needs new tires.

The bank isn’t wrong to approve you. You can technically make those payments. What they don’t model is what your financial life looks like after those payments.

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The Two Rules You Need to Know

Rule 1: The 28/36 Rule (the Bank’s Version)

• Front-end ratio: Housing costs should not exceed 28% of gross monthly income
• Back-end ratio: All debt payments (housing + car + student loans + credit cards) should not exceed 36% of gross monthly income

This is the conventional baseline most lenders use. FHA and VA loans allow higher ratios — up to 43% back-end DTI, sometimes higher with compensating factors.

How to calculate:

1. Take your gross annual household income
2. Divide by 12 for monthly gross
3. Multiply by 0.28 for maximum housing payment
4. Multiply by 0.36 for maximum total debt payments

What “housing costs” includes: Mortgage principal + interest + property tax + homeowner’s insurance + PMI (if applicable) + HOA fees. This is called PITI (Principal, Interest, Tax, Insurance).

Rule 2: The 25% Take-Home Rule (the Real Version)

A more conservative — and more livable — rule: housing costs should not exceed 25% of your monthly take-home pay.

This ensures you have 75% of actual spendable income left for food, transportation, childcare, savings, retirement, and unexpected expenses.

At 25% of take-home pay, you have meaningful financial flexibility. At 35–40%, you’re house-poor — technically affording the mortgage but unable to build wealth, handle emergencies, or absorb income disruptions.

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The Real Affordability Formula: Step by Step

Step 1: Calculate Your True Take-Home Pay

Don’t use gross income. Use what actually hits your bank account after:

• Federal income tax (use your effective rate, not marginal)
• State income tax
• Social Security (6.2%) and Medicare (1.45%)
• Health insurance premiums
• 401(k) contributions
• Any other payroll deductions

Quick estimate: Multiply gross annual income by these factors based on your household’s combined effective tax + deduction rate:

• 0.70–0.72 for moderate earners in low-tax states
• 0.65–0.68 for moderate earners in high-tax states (CA, NY, OR)
• 0.62–0.65 for high earners in high-tax states

Gross Annual Income	Low-Tax State Take-Home	High-Tax State Take-Home
$60,000	~$4,200/month	~$3,800/month
$90,000	~$5,900/month	~$5,300/month
$120,000	~$7,400/month	~$6,600/month
$150,000	~$8,900/month	~$7,800/month
$200,000	~$11,200/month	~$9,600/month

Step 2: Apply the 25% Take-Home Rule

Multiply your monthly take-home by 0.25. That’s your target maximum housing payment — PITI included.

Take-Home Pay	25% Housing Budget
$4,000/month	$1,000/month
$5,500/month	$1,375/month
$7,000/month	$1,750/month
$9,000/month	$2,250/month
$12,000/month	$3,000/month

Step 3: Convert Payment to Loan Amount

At current 2026 mortgage rates (~7.0% on a 30-year fixed), every $100,000 borrowed costs approximately $665/month in principal and interest.

Monthly P&I Budget	Loan Amount at 7.0% 30-Year
$800	~$120,000
$1,200	~$180,500
$1,500	~$225,500
$2,000	~$300,500
$2,500	~$375,500
$3,000	~$451,000

Subtract property tax and insurance from your housing budget before this step. If your target is $1,750/month total and property tax + insurance + PMI costs $450/month, your P&I budget is $1,300/month → roughly a $195,000 loan.

Step 4: Add Your Down Payment

Loan amount + down payment = maximum home price.

• 20% down: loan ÷ 0.80 = home price
• 10% down: loan ÷ 0.90 = home price
• 5% down: loan ÷ 0.95 = home price

At 10% down on a $195,000 loan: $195,000 ÷ 0.90 = $217,000 home price.

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The Full Cost of Ownership: What People Forget

The mortgage payment is the floor, not the ceiling. A complete housing cost picture includes:

Cost Category	Typical Annual Amount	Monthly
Mortgage P&I	Varies	Varies
Property taxes	0.5–2.2% of home value/year	$125–$550 per $100k of value
Homeowner’s insurance	$1,200–$2,500/year	$100–$210
PMI (if <20% down)	0.5–1.5% of loan/year	$83–$250 per $100k loan
HOA fees	$0–$500/month	$0–$500
Maintenance and repairs	1–2% of home value/year	$167–$333 per $100k of value
Utilities (incremental vs. renting)	$1,200–$3,600/year	$100–$300

The 1% maintenance rule: Budget 1% of your home’s purchase price annually for maintenance and repairs. A $350,000 home = $3,500/year = $292/month. This covers the roof, HVAC, appliances, plumbing, and the dozen smaller repairs every year produces.

In practice, maintenance costs are lumpy — you’ll spend $0 for three months and then $4,000 when the water heater and dishwasher fail simultaneously. Budget the average, hold the cash in a dedicated HYSA.

True Cost Comparison at Three Price Points

Assumes 20% down, 7.0% 30-year rate, 1.25% property tax, $1,800/year insurance, 1% maintenance.

Home Price	Down Payment	Loan	P&I	Tax	Insurance	Maintenance	Total Monthly
$250,000	$50,000	$200,000	$1,331	$260	$150	$208	$1,949
$400,000	$80,000	$320,000	$2,129	$417	$150	$333	$3,029
$550,000	$110,000	$440,000	$2,928	$573	$200	$458	$4,159

Notice how the “true monthly cost” is 35–45% higher than the P&I payment alone. This is the gap between what lenders show you and what you actually spend.

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Down Payment Scenarios: The PMI Impact

If you put less than 20% down, you pay Private Mortgage Insurance (PMI) — a monthly premium that protects the lender (not you) against default risk.

PMI rates by loan-to-value ratio (typical range for good credit):

Down Payment	LTV	PMI Rate (annual)	PMI on $300k loan/month
5%	95%	0.85–1.1%	$213–$275
10%	90%	0.5–0.75%	$125–$188
15%	85%	0.3–0.5%	$75–$125
20%	80%	None	$0

When PMI ends: PMI can be requested to be removed when your LTV reaches 80% (you’ve paid down enough principal). It automatically terminates at 78% LTV under the Homeowners Protection Act.

The math on waiting to save 20%: If a $350,000 house requires $70,000 down (20%) vs. $17,500 (5%), the smaller down payment triggers PMI of roughly $200/month. Over 5 years while you’d be building equity, PMI costs $12,000. Weigh this against the opportunity cost of keeping the extra $52,500 invested.

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Interest Rate Sensitivity: How Rate Changes Affect Buying Power

A 1% change in mortgage rate changes your buying power by approximately 10–11%. This is why the rate environment matters as much as home prices.

Monthly P&I payment per $100,000 borrowed:

Rate	Monthly per $100k	$300k Loan	$400k Loan	$500k Loan
5.5%	$568	$1,703	$2,271	$2,839
6.0%	$600	$1,799	$2,398	$2,998
6.5%	$632	$1,896	$2,528	$3,160
7.0%	$665	$1,996	$2,661	$3,326
7.5%	$699	$2,098	$2,797	$3,496
8.0%	$734	$2,201	$2,935	$3,668

The affordability stress test: Before committing to a mortgage at today’s rate, verify you can still comfortably make the payment if rates on a future refinance or ARM adjustment go to 8%. If the 8% payment would consume more than 32% of your take-home pay, you’re cutting it close.

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The Rent-vs-Buy Decision Comes First

None of the above affordability math matters if buying isn’t the right decision for your situation right now.

The key variable is your time horizon. Buying costs 6–10% of home value in transaction costs (closing costs, agent commissions, moving). You need enough price appreciation and equity accumulation to overcome those costs before you can break even.

General rule: Buying makes mathematical sense if you plan to stay 5+ years. Below 5 years, renting is usually cheaper when you account for transaction costs, opportunity cost of the down payment, and the early-year interest-heavy payment schedule.

We ran the actual rent-vs-buy math for 15 US cities at current rates. See our rent vs. buy 2026 analysis before making the decision.

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Before You Buy: The Financial Prerequisites

A house is not an investment when you’re not financially ready for it. Before applying for a mortgage, verify:

Emergency fund: 3–6 months of expenses saved in cash, separate from the down payment. Home repairs don’t wait for your next paycheck.

No high-interest debt: If you’re carrying credit card balances at 20%+, paying those off first earns a guaranteed 20% return. No house appreciates faster than that.

Stable income: Lenders want 2+ years of employment history in the same field. If you’re self-employed, you’ll need 2 years of tax returns showing consistent income.

Credit score: A 760+ score qualifies you for the best rates. A 680 vs 760 score on a $300,000 loan at current rates can cost $50–$80/month more — $18,000–$29,000 over 30 years. See our 50-point credit score improvement guide if you need to improve before applying.

Down payment + closing costs: Plan for 2–5% in closing costs on top of your down payment. On a $350,000 home: $7,000–$17,500 in closing costs plus whatever down payment you’re making.

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The Best Mortgage Rate: Where to Shop

Your lender matters as much as your down payment percentage. The difference between a lender offering 7.0% and one offering 6.75% on a $300,000 30-year loan:

• 7.0%: $1,996/month → $718,527 total paid
• 6.75%: $1,946/month → $700,678 total paid
• Difference: $50/month, $17,849 over the life of the loan

Getting quotes from 3–5 lenders is free and takes about an hour. Mortgage comparison platforms like Credible let you compare real rates from multiple lenders with a single soft pull that doesn’t affect your credit score.

For our mortgage cluster, also see our 15-year vs 30-year mortgage comparison to decide on loan term once you know your price range.

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Frequently Asked Questions

What credit score do I need to buy a house?

Conventional loans typically require a minimum 620 score, though 740+ earns the best rates. FHA loans allow scores as low as 580 with 3.5% down, or 500–579 with 10% down. VA and USDA loans have no official minimum but lenders typically want 620+.

How much should I put down on a house?

20% eliminates PMI and reduces your monthly payment, but isn’t required. Common strategies: 20% if you have the savings and a stable situation; 10% if you want to buy sooner with manageable PMI; 5% only if you’re in an appreciating market and plan to pay down the loan aggressively to remove PMI quickly. The right amount depends on your savings, local market conditions, and how long you’ll stay.

Can I afford a house on one income?

Yes — apply the same formula using one income’s take-home pay. The 25% take-home rule is more conservative, which is prudent when the household has only one income stream. Build a 6-month emergency fund before buying on a single income.

What if I’m self-employed?

Self-employed borrowers need 2 years of tax returns (Schedule C or business returns) showing consistent income. Lenders use your net income after deductions — so aggressively deducting business expenses (correct for tax purposes) can lower your qualifying income. Work with a mortgage broker who specializes in self-employed borrowers. See our self-employed tax deductions guide to understand the interplay.

Should I get pre-approved before shopping?

Yes. Pre-approval is a lender’s written commitment to lend up to a certain amount — it tells sellers you’re serious and gives you a firm budget. Pre-qualification (a quicker, less rigorous process) doesn’t carry the same weight. Most sellers in competitive markets won’t accept offers without a pre-approval letter.

What is escrow and do I have to use it?

Escrow is an account managed by your lender that collects and pays your property tax and homeowner’s insurance. Most lenders require it, especially if your down payment is less than 20%. Your monthly mortgage payment includes a portion that goes into escrow, which the lender uses to pay tax and insurance bills when they’re due.

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This guide was last updated June 13, 2026. Mortgage rates change daily — verify current rates before making decisions. All calculations are illustrative and based on estimates. This is not financial or legal advice. Consult a licensed mortgage professional and financial advisor for guidance specific to your situation. See our methodology and affiliate disclosure.