The 28/36 rule and why it's only a starting point
Most lenders use a 28/36 front-end/back-end ratio: housing expenses should stay under 28% of gross monthly income, and total debt payments under 36%. For a household earning $10,000 a month, that's $2,800 a month for principal, interest, property taxes, and homeowners insurance (PITI), with total debt under $3,600.
The 28/36 rule is a useful first filter, but it doesn't capture the full cost of owning. Property taxes range from 0.32% in Hawaii to 2.23% in New Jersey. Homeowners insurance runs $1,400 to $3,500 a year depending on state and risk profile. PMI adds 0.5% to 0.85% of the loan balance annually when the down payment is below 20%. HOA fees in condos and planned communities can add $200 to $600 a month. Add maintenance at 1% of the home's value per year, and the true monthly cost is roughly 15% to 25% higher than the mortgage payment alone.
How much house you can afford at common incomes
| Annual income | Max PITI (28%) | Affordable home price (20% down, 7% rate) |
|---|---|---|
| $60,000 | $1,400/mo | ~$220,000 |
| $85,000 | $1,983/mo | ~$315,000 |
| $120,000 | $2,800/mo | ~$445,000 |
| $160,000 | $3,733/mo | ~$595,000 |
| $200,000 | $4,667/mo | ~$745,000 |
| $300,000 | $7,000/mo | ~$1,120,000 |
The "affordable home price" column assumes 20% down, a 7% 30-year fixed rate, 1% property tax, $1,800/year insurance, and 0.3% PMI fallback where applicable. At 6% instead of 7%, the same monthly payment supports roughly 17% more home.
What changed in 2026
Freddie Mac's October 2026 survey put the 30-year fixed at 7.40%, the highest level in 25 years. Conforming loan limits rose to $832,750 in most counties and $1,249,125 in high-cost areas. The combination of higher rates and higher conforming caps means the maximum loan size has grown, but the household income required to qualify at the new ceiling has grown faster. A household that qualified for a $500,000 loan at 3% in 2021 needs roughly 60% more income to qualify for the same loan at 7.4% in 2026.
The Fed's rate cycle is the swing factor. Each 0.25% drop in the 30-year fixed adds about 3% to the maximum affordable home price, so the timing of a purchase matters more than it has in a decade. Households shopping now should ask whether the 7.4% rate reflects the next two to three years, or whether the rate has peaked.
The five hidden costs most first-time buyers miss
Property taxes are the biggest line item most buyers underestimate. Effective rates range from 0.32% in Hawaii to 2.23% in New Jersey, 1.99% in Illinois, 1.73% in Texas. A $400,000 home in Texas costs roughly $6,920 a year in property tax. The same home in Hawaii costs $1,280.
Homeowners insurance averages $1,400 to $3,500 a year nationally, but coastal states (Florida, Louisiana, Texas Gulf, Carolinas) and high-wildfire zones (California, Colorado) routinely see $4,000 to $8,000. Ask for an insurance quote before going under contract, not after.
PMI applies when the down payment is below 20%. The rate runs 0.5% to 0.85% of the loan balance per year, split into monthly payments. A $400,000 loan with 5% down adds roughly $160 to $270 per month until you reach 22% equity, at which point PMI cancels automatically. The FHA route adds PMI for the life of the loan unless you refinance at 22% equity.
HOA fees apply to condos, townhomes, and most planned communities. The range is $0 to $1,500 a month, with the median around $250 to $400. HOA fees cover exterior maintenance, amenities, and insurance, but they don't reduce your mortgage qualification, so a $400 HOA on top of a $2,500 PITI may push you over the 28% line.
Maintenance and repairs average 1% of the home's value per year, but the variance is huge. A 20-year-old roof costs $8,000 to $20,000 to replace. HVAC systems run $5,000 to $12,000. Budget $300 to $500 a month into a repair reserve, separate from the mortgage payment.
How lenders actually qualify you
Most lenders run your application through an automated underwriting system (AUS) that calculates a debt-to-income (DTI) ratio. The AUS pulls a credit report, verifies income and assets, and returns an approval with conditions. Conventional loans typically allow up to 45% to 50% DTI, FHA loans allow up to 56.9% with compensating factors, and VA loans have no strict DTI cap.
The three things that move your approval the most: credit score (a 100-point jump can move your rate by 0.25% to 0.5%), down payment size (5% down versus 20% down adds PMI but doesn't change the rate), and reserves (two to six months of PITI in the bank after closing).
Lenders don't see your full financial picture. They don't know you have $400 a month in child care, or that you drive 50 miles a day and burn $300 in gas. The mortgage qualification is the floor, not the ceiling. Build a personal budget that includes all your actual monthly costs, not just the ones the lender counts.
Use an affordability calculator, then sanity-check the answer
An online calculator gives a quick answer based on income, down payment, and current rates. The honest answer is to run the calculation, then add 15% to the total monthly cost for taxes, insurance, PMI, HOA, and maintenance, and ask whether you can still cover that number on a single income. If the answer is no, drop the home price by 10% to 15% and recheck.
The buy-versus-rent break-even is the other sanity check. A household paying $2,500 a month in rent and looking at a $3,800 a month PITI is paying $1,300 more a month to own. The buy decision is rational if the home appreciates 3% a year, you stay at least five years, and the rent equivalent would rise with inflation. It is not rational if you expect to move within three years or if the local market has flat appreciation.
The right answer is what you can pay, not what you can borrow
Lenders will approve you for more than you can comfortably afford. The 28/36 rule is a guideline, not a guarantee. Households that buy at the maximum approval typically struggle with the first major repair, the first job loss, or the first rate reset on an ARM. The right approach is to buy the home that costs 20% to 30% less than your maximum approval, leave 3 to 6 months of expenses in a cash reserve, and keep retirement contributions on schedule. The lender's number is the ceiling, not the target.
Photo: Tumisu, Pixabay Content License, via Pixabay (https://pixabay.com/photos/real-estate-agent-sale-home-keys-3337032/)









