How Much House You Can Afford: Take-Home First, Preapproval Second

At Sorted Finance we organize money decisions with clear numbers—and the useful answer to how much house you can afford almost never matches the biggest number on a preapproval letter. Approval is a lender risk test. Comfort is a household cash-flow test. Confusing the two is how buyers become house-rich and checking-account-poor.

Labeled round figures below are for a U.S. buyer. Local taxes, insurance, and rates change. Re-run everything with a real quote and address.

Start from take-home, not gross

Lenders often underwrite from gross income and debt ratios. Your life runs on what hits checking after taxes and benefits. Convert any “28% of gross” rule of thumb into after-tax dollars before you fall in love with a listing.

**Teaching sketch:** Reese takes home $6,400/month. Non-housing debts (car, student loan, minimum cards) total $780. Reese wants to keep $500/month for retirement deposits and $300 for irregular sinking funds. That leaves about $4,820 before housing and true discretionary spending. Housing must leave room for food, transport, and a buffer—so a $2,900 total housing stack may already feel tight even if a lender’s letter goes higher.

Write your own version of that sketch before touring. Emotions at open houses are poor spreadsheet substitutes.

Build the full housing stack

Affordability is not principal and interest alone. Add:

• Property taxes (ask for realistic local estimates, not last year’s surprise)
• Homeowners insurance
• PMI or other mortgage insurance if applicable
• HOA or condo fees
• A maintenance reserve (many households sketch about 1% of price per year as a planning placeholder, then adjust for age, roof, and climate)

Use Sorted Finance’s mortgage calculator for P&I, then add the other lines manually from local quotes. Compare the stack to take-home, not to gross-income slogans.

Preapproval is a ceiling

Underwriting asks whether the loan looks repayable on paper. It does not ask whether you can still fund childcare, travel to family, or a furnace replacement. Bid below the maximum when the comfort stack says so. Stretching to the letter’s top number is optional—and often stressful.

A longer term softens P&I and can raise the price a lender will consider, while keeping the balance high longer and usually raising total interest if you hold to maturity. Clearing the first payment is only one piece of affordability. See Sorted Finance’s 30-year versus 15-year guide when term shopping is part of the decision.

Down payment, closing costs, and reserves

More down can shrink the loan and PMI—and empties cash. Closing costs, moving, immediate repairs, and an emergency fund after closing all need oxygen. Run three scenarios: smaller price, larger down, or accepting temporary PMI with stronger reserves.

**Teaching sketch:** On a $380,000 purchase, 5% down is $19,000 and 20% down is $76,000. The payment and PMI differ, but so does the cash left for closing and a three-month essentials buffer. The “cheaper” monthly quote can be the riskier household if reserves hit zero on move-in day.

The house you can get approved for and the house you can live with are different numbers. Shop with the second.

Debt-to-income versus comfort

DTI ratios help lenders rank risk. They are not a lifestyle guarantee. High childcare, medical premiums, or support payments can make a “passing” DTI feel crushing. Low other debts can make a higher housing share workable for some households. Translate every ratio back into leftover take-home after the full housing stack.

Stress tests worth running

1. Payment at a rate 1% higher than today’s quote.
2. One income only for three months.
3. Tax reassessment after purchase.
4. HOA special assessment (condo/townhome).
5. Maintenance year that hits about 2% of price.
6. Insurance renewal that jumps after a regional claim year.

If those scenarios break the budget, the price is too high for comfort even if underwriting smiles.

Two-earner and relocation wrinkles

Two incomes raise the lender’s ceiling quickly; they also raise the damage if one job ends. Size the housing stack so one income can carry essentials for a few months, or keep a thicker emergency fund. Relocating for work adds temporary housing, deposits, and furniture costs that compete with down payment cash—budget those before stretching the purchase price.

New construction and condos can hide HOA special assessments, builder warranties that expire, and higher insurance. Ask for the full monthly ownership cost in writing, not only the advertised mortgage payment.

What this guide cannot appraise

Your lender’s guidelines, local taxes, and insurance quotes control. This article is education from Sorted Finance—not a preapproval and not a promise that any percentage of income is safe.

The practical takeaway

Build a full monthly housing stack from take-home pay after other debts and savings goals, keep post-closing reserves, and treat preapproval as a hard stop—not a target. Shop listings against that comfort number before you fall in love with granite counters. The affordable house is the one that still leaves room for ordinary life when the welcome mat is worn.