The 28/36 rule: the foundation of mortgage affordability
Lenders use the 28/36 rule as the primary affordability guideline. It works as follows:
- Your monthly housing costs (mortgage principal, interest, property taxes, insurance — PITI) should not exceed 28% of your gross monthly income.
- Your total monthly debt payments (housing + car loans + student loans + credit cards) should not exceed 36% of your gross monthly income.
On a $100,000 annual salary ($8,333/month gross), the 28% rule limits your housing payment to $2,333/month. The 36% rule limits total debt payments to $3,000/month. If you have a $400/month car payment and $300/month student loan payment, your housing budget shrinks to $3,000 − $700 = $2,300/month.
How much house does that buy in 2026?
With current US mortgage rates in the 6.5–7.5% range for a 30-year fixed mortgage, here is the approximate purchase price supported by various monthly payments:
- $1,500/month payment → approximately $220,000–240,000 home (with 20% down)
- $2,000/month payment → approximately $290,000–320,000 home
- $2,500/month payment → approximately $365,000–400,000 home
- $3,000/month payment → approximately $435,000–480,000 home
These assume 20% down payment to avoid PMI. With a smaller down payment, the same monthly budget buys a less expensive home because PMI adds $100–300/month in insurance costs.
Down payment options in 2026
Conventional loan (3–20% down): The most common loan type. Putting less than 20% down triggers PMI at 0.5–1.5% of the loan annually. PMI can be removed once you reach 20% equity.
FHA loan (3.5% down): Requires a minimum 580 credit score. FHA mortgage insurance persists for the life of the loan if your down payment is less than 10%, which makes it more expensive long-term despite the lower upfront requirement.
VA loan (0% down): Available to US veterans, active military, and surviving spouses. No PMI, competitive rates, no down payment required. A significant financial benefit for those who qualify.
USDA loan (0% down): Available for rural properties and some suburban areas meeting USDA income and location requirements. No PMI, but has an upfront guarantee fee and annual fee.
The true cost of homeownership beyond the mortgage
First-time buyers often underestimate ongoing costs. Budget for these monthly in addition to your mortgage:
- Property taxes: 0.5–2.5% of home value annually, depending on location. A $300,000 home in a high-tax state might owe $5,000–7,500/year ($416–625/month).
- Homeowners insurance: $100–200/month nationally, higher in disaster-prone areas.
- Maintenance and repairs: Budget 1–2% of home value annually. A $300,000 home should have $3,000–6,000/year reserved for repairs — equivalent to $250–500/month.
- HOA fees: $100–600/month for condos, townhomes, or planned communities. Zero for standalone homes without an HOA.
The credit score impact on your mortgage rate
Your credit score is the single largest variable in your mortgage interest rate. The difference between a 680 and 760 score on a $300,000 mortgage can be 1–1.5 percentage points, which translates to:
- 680 credit score at 7.5%: $2,097/month, $454,920 total interest over 30 years
- 760 credit score at 6.5%: $1,896/month, $382,560 total interest over 30 years
- Difference: $201/month or $72,360 over the loan term
Spending 6–12 months improving your credit score before applying — paying down credit card balances, disputing errors on your credit report, avoiding new credit applications — can be worth tens of thousands of dollars.
First-time buyer programmes in 2026
Many states offer first-time buyer assistance programmes including down payment assistance, closing cost grants, and reduced-rate mortgages. HUD's website (hud.gov) maintains a state-by-state directory. The qualification threshold for "first-time buyer" is typically "has not owned a home in the past 3 years" — not strictly never having owned a home.
Renting vs buying in 2026
With elevated mortgage rates and home prices near historic highs in many markets, renting is mathematically superior in some expensive metros. The price-to-rent ratio (home price ÷ annual rent) above 20 generally favours renting financially; below 15 generally favours buying. In New York, San Francisco, and parts of Los Angeles, this ratio exceeds 30 — meaning renting and investing the down payment in index funds would outperform buying over a 10-year horizon at current prices. In the Midwest and South, ratios are often 12–18, making buying clearly advantageous. Run the numbers specific to your local market before deciding.