How Much House Can You Afford in 2026? The Ratios Lenders Use — and the Safer Ones

Last editorial review: September 3, 2026

U.S. scope: This article discusses United States institutions, product conventions, and dollar examples unless stated otherwise. Rules can vary by state and provider and may change. The UK box below is a comparison, not UK-specific advice.

Hero answer

One common planning heuristic is the 28/36 rule: housing costs near or below 28% of gross monthly income and total monthly debt payments near or below 36%. Fannie Mae describes these figures as general guidelines, not universal approval limits; lenders and loan programs may use different standards. The CFPB defines debt-to-income ratio (DTI) as monthly debt payments divided by gross monthly income. See Fannie Mae’s 28/36 glossary entry and the CFPB’s DTI explanation.

Important: a lender’s maximum is a lending ceiling, not your family budget. DTI excludes many everyday and unavoidable family costs (childcare, baseline savings, maintenance) and therefore can overstate what you can sustainably carry. A safer approach treats every fixed commitment — housing, debts, childcare, required saving — against your actual take‑home pay and budgets the full cost of owning (mortgage plus taxes, insurance, PMI, HOA, maintenance, and sinking funds). This guide explains the ratios lenders use, the DTI mechanics underneath them, worked illustrative examples, why lender approvals can still leave buyers house poor, and a conservative family‑focused framework to test affordability before you shop.

This is educational information only, not financial or lending advice. All numeric examples are illustrative; no current interest rates or product offers are quoted.

Who this is for

This article is aimed at first‑time homebuyers and families turning a pre‑approval into a realistic budget. If a pre‑approval number feels generous, that instinct is worth trusting: lenders screen repayment risk, not life priorities. Before doing mortgage math, it helps to have a household budget — see Finelo’s family budget guide for a place to start.

The 28/36 rule — a lender convention, not a law

The 28/36 rule is a planning guideline rather than a legal or universal underwriting cap:

• Front‑end (housing) guideline: roughly 28% of gross monthly income for housing costs. "Housing costs" commonly include principal and interest, property taxes, and homeowners insurance — and, when applicable, private mortgage insurance (PMI) and HOA or condo dues.
• Back‑end (total‑debt) guideline: roughly 36% of gross monthly income for total monthly debt payments, including housing plus installment loans, credit‑card minimums, and court‑ordered payments. This back‑end figure is commonly called the debt‑to‑income ratio (DTI).

The figures can be useful for an initial screen, but different loan programs and lenders use different DTI limits and may consider other factors. The CFPB confirms that limits differ by lender and product; use actual lender disclosures for an approval estimate and a household budget for affordability.

DTI mechanics: what counts, and why that matters

DTI = (all recurring monthly debt payments) ÷ (gross monthly income). The Consumer Financial Protection Bureau (CFPB) explains DTI in consumer‑facing materials and shows worked examples to illustrate how the numerator and denominator work.

Typical items included in the numerator:

• Mortgage principal and interest (or the projected mortgage payment for the property you’re buying), property taxes, homeowners insurance.
• Required mortgage insurance (PMI where applicable) and recurring HOA dues.
• Minimum payments on revolving accounts (credit cards) and scheduled payments on installment debts (auto, student, personal loans).
• Court‑ordered payments such as child support or alimony.

Commonly excluded from DTI:

• Everyday living costs such as groceries, most childcare payments, utilities, and transportation.
• Voluntary savings goals (retirement, college), unless they appear as required deductions or contractually required contributions.

Two practical consequences:

1. Lenders typically use minimum payments for revolving debt when computing DTI, which can understate monthly cash outflow if you regularly pay more than the minimum.
2. Because DTI focuses on debt service, it can miss essential household commitments that affect your ability to live comfortably in the home you buy.

Because DTI counts debt payments but not many fixed living costs, the mechanics directly explain why the ratio can produce an approval that feels unaffordable to a household — the next sections show how.

What the ratios look like at three illustrative incomes

Below are pure ratio calculations (no interest rates or home‑price conversions, because those require current‑rate assumptions). These show the monthly caps implied by the 28/36 convention at three sample gross incomes.

Illustrative note: at $90,000/year, a household with $450/month in auto payments and $250/month in student loans would have $2,700 − $700 = $2,000 remaining under the 36% total‑debt cap for housing‑related costs. Converting a monthly cap into a home price requires current mortgage rates, term, taxes, insurance, and your down payment — those inputs change over time and are outside the scope of these ratio‑only examples.

Why the lender's maximum isn't your maximum (the "house poor" gap)

An approval says a lender believes you can make the monthly payments under specific loan terms. It does not evaluate whether making those payments leaves room for saving, emergencies, or family priorities. Common ways the approval‑versus‑affordability gap appears:

• Childcare and eldercare are typically excluded from DTI but can be ongoing, fixed monthly costs that rival a mortgage payment.
• Required retirement or college savings reduce take‑home pay but don’t show up in DTI.
• Lumpy, predictable costs (maintenance, one‑time repairs, seasonal bills) arrive after closing and strain cash flow if not pre‑funded.
• A single‑income risk or job disruption can turn a maximum‑approval mortgage into a financial crisis if there are no reserves.

Vignette (illustrative): a household buys at the lender’s ceiling. Daycare, a car repair, and a roof repair appear within a few months. With no sinking funds and low emergency savings, the household must cut retirement contributions or borrow — outcomes the lender’s DTI calculation did not capture. That household is technically current on mortgage payments but financially squeezed: the definition of "house poor."

A safer family‑focused framework (Finelo editorial rule of thumb)

This is Finelo’s conservative, editorial rule of thumb for translating lender math into a household plan. It is not an industry standard — treat it as a protective budgeting method.

Steps

1. Start from take‑home pay (net monthly income after taxes, payroll deductions, and required pretax contributions).
2. Add all fixed monthly commitments: projected housing cost (PITI + PMI + HOA as applicable), minimum debt payments, childcare/eldercare, required insurance premiums, and baseline saving you will not skip (emergency fund replenishment, retirement contributions).
3. Aim to keep that total comfortably below your take‑home pay so you maintain discretionary spending and a buffer for unexpected costs. Many families find keeping all fixed commitments noticeably under half of take‑home pay offers a practical margin of safety.

Why this helps

• It uses the money you actually receive (net instead of gross).
• It treats saving and childcare as fixed commitments rather than optional extras.
• It provides an explicit margin of safety between the lender’s ceiling and what life actually costs.

Use this family‑focused test to decide the maximum monthly housing cost that feels sustainable for your household — then shop to that number, not to the top of your pre‑approval.

The full cost of owning — break it down

The mortgage payment is one layer of a broader cost stack. When planning monthly affordability, include both recurring and lumpy costs.

Recurring monthly items

• PITI: principal, interest, property taxes, homeowners insurance — the core mortgage‑related payment.
• PMI: private mortgage insurance, when required by the loan program.
• HOA/condo dues and any higher utility or operating costs compared with your previous housing.

Lumpy and up‑front items

• Maintenance and repairs: a commonly used planning heuristic is roughly 1% of home value per year averaged over time; treat this as a rule‑of‑thumb for planning rather than an exact requirement.
• Major replacements: roof, HVAC, water heater — fund these with a sinking fund so replacements don’t require emergency borrowing.
• Closing costs and prepaid items: guidance often suggests planning for a few percent of the purchase price or loan amount for closing; exact amounts depend on the transaction.

Practical tool: use a sinking fund to smooth lumpy costs and avoid surprise borrowing. Finelo’s sinking‑fund explainer shows how to set aside a steady monthly amount for predictable home repairs: finelo.com. While saving for the purchase itself, keep down‑payment cash in liquid, low‑risk accounts.