How much house can I afford is the most important question to answer before you ever open a listing, contact an agent, or step inside a showroom. Most buyers skip this step. They get pre-approved, fall in love with a home at the top of their approval limit, and spend the next decade financially stretched.
This guide walks you through the exact math — the 28/36 rule, the DTI calculation, and a step-by-step method to find your real purchase ceiling. Not the bank’s ceiling. Yours.
How Much House Can I Afford? Start With the 28/36 Rule
The 28/36 rule is the most reliable housing budget rule available to a first-time buyer. It gives you two hard limits:
- Your total monthly housing cost should not exceed 28% of your gross monthly income
- Your total monthly debt — housing included — should not exceed 36% of your gross monthly income
These aren’t arbitrary numbers. They exist because buyers who exceed them statistically run into financial trouble within 3–5 years of purchase — missed savings goals, deferred maintenance, debt accumulation, and in serious cases, default.
Asking how much house can I afford is really asking: at what point does my housing cost stop being manageable and start being a burden?
The 28/36 rule draws that line.
What the 28% Front-End Ratio Covers
The front-end ratio covers your full monthly housing payment: principal, interest, property taxes, and homeowner’s insurance — commonly called PITI. If your gross monthly income is $6,000, then 28% is $1,680. That is your housing cost ceiling.
This is a maximum, not a target. If you have other financial goals — retirement savings, a business, kids’ education — aiming for 23–25% gives you more room to work with.
What the 36% Back-End Ratio Covers
The back-end ratio includes your housing payment plus every other monthly debt: car loans, student loans, credit card minimums, personal loans. All of it.
If your existing debts total $500/month and your gross income is $6,000:
$6,000 × 36% = $2,160 − $500 = $1,660 maximum housing payment
Whichever number is lower — your front-end cap or your back-end cap — is your actual budget. In most cases with existing debt, the back-end ratio is the binding constraint.
How to Calculate Your Debt-to-Income Ratio for a Mortgage
Your debt-to-income ratio (DTI) is the number lenders care about most. Knowing yours before you apply puts you in control of the conversation. Here is how to calculate it in three steps.
Step 1 — Find Your Gross Monthly Income
Use your income before taxes. Include salary, consistent freelance income, rental income, and any other regular source. If you earn $72,000 annually, your gross monthly income is $6,000.
If your income varies month to month, take a conservative 12-month average. Do not inflate this number — it only hurts you later.
Step 2 — Add Up All Monthly Debt Payments
List every fixed monthly debt obligation:
- Car loan: $350
- Student loan: $200
- Credit card minimum payment: $75
- Personal loan: $100
- Total existing monthly debt: $725
Leave out utilities, groceries, streaming services — these affect your liveable budget but are not part of the DTI formula.
Step 3 — Apply the DTI Formula
Front-end limit: $6,000 × 0.28 = $1,680
Back-end limit: $6,000 × 0.36 = $2,160 − $725 (existing debt) = $1,435
Your real monthly housing budget is $1,435. That is the number you use to determine how much house you can afford.
How Much House Can I Afford Based on My Monthly Payment?
Now you translate that monthly limit into a purchase price.
The rule of thumb at a 7% interest rate on a 30-year fixed mortgage: every $100,000 borrowed costs approximately $665/month in principal and interest.
Take your $1,435 budget. Subtract estimated property taxes and homeowner’s insurance — typically $200–$400/month combined. That leaves $1,035–$1,235 for principal and interest.
At 7%, this supports a loan of approximately $155,000–$185,000.
If you add a 20% down payment of $40,000–$45,000, your total home price ceiling lands at roughly $195,000–$230,000.
That is your answer to how much house can I afford based on your actual numbers — not a bank’s ceiling, not an agent’s suggestion.
What Lenders Approve vs. What You Should Actually Borrow
Most conventional lenders approve buyers at a back-end DTI of up to 43–45%. Some government-backed programs go higher. A bank approving you at that level is not saying it’s comfortable — they’re saying it meets their minimum underwriting threshold.
At 43% DTI, nearly half your gross income goes toward debt before taxes, food, savings, or anything unexpected. Any financial disruption — job loss, medical bill, home repair — has nowhere to go.
This is exactly why how much house can I afford and how much will a bank lend me are two different questions with two different answers. Always calculate your own limit first.
The Hidden Costs That Change How Much House You Can Afford
Your mortgage payment is not your total housing cost. These items are real, recurring, and consistently underestimated by first-time buyers:
- Property taxes: Depending on location, these add $200–$800/month on a median-priced home
- Homeowner’s insurance: Typically $100–$200/month, higher in high-risk zones
- HOA fees: Range from $100 to $1,000+/month in condos and planned communities
- Maintenance and repairs: Budget 1% of home value annually. On a $250,000 home, that’s ~$208/month
- Closing costs: 2–5% of the purchase price, paid upfront. On a $250,000 home, expect $5,000–$12,500
- Setup and moving costs: Rarely under $2,000 even for a simple move
If you’re calculating how much house you can afford based on the mortgage payment alone, you’re systematically underestimating your real monthly cost.
How Your Down Payment Affects How Much House You Can Afford
A larger down payment changes three things directly:
- Lowers the loan amount — smaller loan = lower monthly payment = more home price for the same payment
- Eliminates PMI — private mortgage insurance is required on most loans with less than 20% down and adds $50–$200/month
- Can improve your interest rate — lower loan-to-value ratios often unlock better pricing from lenders
The trade-off is cash reserves. Draining your savings to hit 20% down and then buying a home with no emergency fund is a risk most buyers don’t adequately weigh. If a major repair hits in month three, the money has to come from somewhere.
A practical position: if 20% down still leaves you with 3–6 months of expenses in cash after closing, go for it. If not, a smaller down payment with PMI and a healthy cash buffer is often the more rational choice.
How Much House Can I Afford? A Self-Check Before You Start Looking
Run through this before you contact any agent or open any listing:
- Calculate gross monthly income (all sources, pre-tax)
- List and total all existing monthly debt payments
- Apply 28% and 36% rules — find which gives the lower housing budget
- Subtract estimated taxes, insurance, and HOA from that budget
- Use a mortgage calculator to find the loan amount your remaining budget supports
- Add your planned down payment to get your home price ceiling
- Confirm you’ll still have 3–6 months of cash reserves after closing
- Budget 1% of home value per year for maintenance
If every line of this works — you are ready. If one line breaks, you now know exactly what needs to change before you begin.
FAQs
How much house can I afford on a $60,000 salary?
Gross monthly income is $5,000. At 28%, your housing payment ceiling is $1,400. After subtracting ~$300 for taxes and insurance, you have ~$1,100 for principal and interest. At 7%, that supports a loan of about $165,000. With 10% down ($18,000), your price ceiling is roughly $183,000 — assuming minimal existing debt.
Does my credit score change how much house I can afford?
Yes, materially. A 740+ credit score typically qualifies for lower interest rates. A 1% rate difference on a $200,000 loan changes your monthly payment by $120–$130 and your total cost over 30 years by $40,000+. Better credit directly increases how much house you can afford at the same monthly payment.
What DTI ratio do lenders require for a mortgage?
Most conventional lenders cap the back-end DTI at 43–45%. FHA loans may allow up to 50% with strong compensating factors. But qualifying at the maximum and being financially comfortable at the maximum are not the same thing.
Is the 28/36 rule still relevant today with higher home prices?
The rule is a guideline, not a law. In high-cost markets, strict adherence may be impractical. But the underlying logic — don’t let housing consume so much income that nothing else is possible — remains entirely valid. If you’re exceeding 36% back-end DTI, you need to be clear-eyed about the trade-offs you’re accepting.
Should I get pre-approved before using an affordability calculator?
Calculate your own limit first using the 28/36 rule. Then get pre-approved to see what lenders will offer. If the bank’s number is higher than yours, stick to yours. If it’s lower, that tells you something important about how lenders are reading your file.
