What Home Payment Can I Actually Afford?
A lender tells you the largest loan they are willing to risk. That is a ceiling, not a budget. The number you actually want is the payment your life can carry after taxes, maintenance, childcare, and savings — usually well below what the approval letter says.
Short answer: aim for about 25% of your net monthly income on all-in housing, treat 30% as the ceiling, and count the ownership costs a lender never asks about.
Calculate my real numberStart with net income, not gross
Underwriting runs on gross income — the number at the top of your pay stub, before taxes, health premiums, and retirement contributions come out. Your mortgage is paid from the number at the bottom. For most households, take-home pay is 25% to 35% lower than gross, so the familiar 28% and 36% rules quietly describe a much larger share of the money you actually have.
Reframed against net pay, two numbers do most of the work. About 25% of net on all-in housing is comfortable — it leaves room for the ownership costs underwriting ignores. Around 30% is a ceiling: above it, maintenance funds and retirement contributions are usually the first things to get cut.
And be precise about what “the payment” means. PITI is principal, interest, taxes, and insurance — the four pieces of an escrowed mortgage payment. It is the floor of your housing cost, not the total. HOA dues, utilities, and repairs sit on top of it and never appear in a rate quote.
Calculate your real number
Enter what you take home and what the house actually costs. Everything recalculates as you type.
1. What you actually take home
What actually lands in your account each month, after taxes and deductions.
2. The full cost of the house
Principal, interest, taxes, and insurance for the home you're considering.
About 1% of home value per year, divided by 12.
Electric, gas, water, sewer, trash, internet.
Leave at 0 if there is no association.
3. The life a lender can’t see
Underwriting ignores this entirely.
The contribution you refuse to stop making.
Groceries, gas, insurance, subscriptions, eating out.
Bank qualification vs. your real monthly housing number
Bank qualification
$3,120
Illustrative 36% debt ratio applied to estimated gross income. Ignores maintenance, childcare, savings, and everyday spending.
Your real monthly housing number
$1,625
25% of net income, capped by what’s left after the commitments you entered.
A lender would approve about $1,495 more per month than your budget supports. That gap is the house-poor zone.
Your summary
Over your ceiling
A lender may still approve this. Your budget is telling you something different.
- All-in housing cost
- $2,793
- Comfort target (25% of net)
- $1,625
- Safety ceiling (30% of net)
- $1,950
- Left for housing after your commitments
- $4,400
Ghost expenses
These are the costs of ownership that never touch a debt-to-income calculation, because none of them show up on a credit report. They are also the reason an approved payment and a livable payment are two different numbers.
Maintenance and repairs
Nothing in a house is somebody else's problem anymore. Water heaters, roofs, HVAC, appliances, and the small things that add up between the big things. Some years you spend nothing and some years you spend eleven thousand dollars at once, so it has to be a monthly line either way.
Rule of thumb: Budget roughly 1% of the home's value per year — about $333/month on a $400,000 home.
The utility jump
A house is bigger than the apartment, it has more exterior wall, and the bills that used to be bundled into rent are now separate: water, sewer, trash, sometimes gas. Renters routinely underestimate this by half.
Rule of thumb: Expect $100 to $300 more per month than you pay renting, more in an older or larger home.
HOA and community fees
If the listing has an HOA, that payment never goes away and it does not stay flat. Dues rise, and special assessments arrive with no warning when the community needs a new roof or a repaved lot.
Rule of thumb: Include the full current dues, and assume increases over the years you'll own.
Taxes and insurance creep
PITI is principal, interest, taxes, and insurance. The P and I are fixed on a fixed-rate loan. The T and I are not — reassessments and premium hikes raise your escrow, which raises your payment after closing.
Rule of thumb: Assume your escrow portion drifts upward every year, even on a fixed-rate mortgage.
Childcare and dependents
Underwriting does not count daycare, tuition, or supporting a parent as debt, because none of it shows on a credit report. It is often the single largest number in a household's budget after housing.
Rule of thumb: Enter it as a hard monthly commitment, not a flexible expense.
Retirement and emergency savings
A lender treats the money you save as money available for a mortgage payment. Stopping your contributions to make the payment work is technically qualifying and practically a bad trade.
Rule of thumb: Protect the contribution first, then see what payment is left over.
Lifestyle and subscriptions
Groceries, gas, travel, streaming, the gym, eating out, gifts. DTI ignores every dollar of it. This is the category that quietly turns an approved payment into a house-poor one.
Rule of thumb: Total what you actually spend for a month — not what you intend to spend.
Add these to the math. A payment that fits before ghost expenses usually does not fit after them.
Calculate my real numberThe unseen life a lender can’t see
Debt-to-income counts what a credit bureau reports: car loans, student loans, minimum credit card payments. It does not count daycare or tuition, elder care, groceries, gas, commuting, health costs paid out of pocket, travel, or the retirement contribution you have been making for a decade.
That omission is not a mistake on the lender’s part — it is simply a different question. They are asking whether you are likely to repay the loan. You are asking whether you will still be able to fund the life you already have. Only one of you is answering the question you care about.
The practical fix is to fund the non-negotiables first — savings, childcare, the real cost of ordinary living — and treat what remains as the ceiling on housing. That is how the calculator above caps your real number, which is why it usually lands below the bank’s figure.
The mortgage trial run
Before you commit for thirty years, live the payment for three or four months. It is the only test that accounts for how you actually spend rather than how you plan to.
Pick the number you’ll practice with. Use the all-in figure, not the mortgage payment alone.
Stress test this paymentCommon questions
Assumptions and disclaimer
- The 25% comfort target and 30% ceiling are applied to net (take-home) monthly income, not gross. They are common budgeting benchmarks, not underwriting rules, and no lender uses them to approve a loan.
- The 1% maintenance figure is an annual planning average based on home value. Actual repair costs vary widely by age, condition, climate, and luck.
- The lender comparison shown in the calculator applies a 36% total debt ratio to estimated gross income for illustration only. Your actual approval depends on the loan program, credit score, down payment, reserves, and the debts on your credit report.
- This page is educational budgeting guidance. It is not lending, tax, investment, or legal advice, and it is not a loan offer, pre-qualification, or commitment to lend. Talk to a licensed loan officer and a tax professional about your own situation.