How Much House Should You Buy? A Strategy Guide

This is a strategy guide, not a calculator. The math of affordability is the easy part, our Home Affordability Calculator handles it in seconds. The harder question is the one this article tackles: how do you decide what you should borrow when the lender will let you borrow a lot more?

Qualify vs. Afford: The Key Difference

When a lender pre-approves you, they're answering one question: based on your income, debts, and credit, what's the maximum monthly payment we'd allow? That ceiling is calculated using debt-to-income ratios, not your goals, savings rate, lifestyle, or how much margin you want in your budget.

The result is that many borrowers get approved for far more than they should actually borrow. A house that maxes out your DTI today can become a real strain when property taxes go up, insurance premiums rise, or a major repair shows up.

The 28/36 Rule (and Why It Still Holds Up)

A widely used affordability guideline is the 28/36 rule. Your housing payment, principal, interest, taxes, insurance, and HOA, should stay below 28% of gross monthly income. Your total debt payments (housing plus auto, student, credit card, etc.) should stay below 36% of gross monthly income.

Lenders will frequently approve borrowers up to 43–50% DTI on certain programs, but most financial planners agree the 28/36 zone keeps you comfortable rather than house-poor.

What Goes Into a California Mortgage Payment

California has some of the highest housing costs in the country, but property taxes are relatively middle-of-the-pack thanks to Proposition 13. A realistic monthly payment in California includes:

• Principal & interest: the loan itself
• Property tax: roughly 1.0%–1.25% of assessed value annually in most California counties
• Homeowners insurance: typically $1,200–$2,500/year for a standard policy; significantly more in high-fire-risk areas
• Mortgage insurance: required on most loans with less than 20% down (FHA MIP or conventional PMI)
• HOA dues: common with condos, townhomes, and some PUDs

Don't budget around principal and interest alone. When you're ready to put numbers to it, the Home Affordability Calculator works backward from your inputs to a comfortable purchase price.

The Other Costs People Underestimate

Closing costs typically run 2–4% of the purchase price and aren't part of the mortgage. Move-in expenses (furniture, appliances, utility deposits) add up fast. And homeowners, especially first-time ones, should plan for ongoing maintenance of about 1% of the home's value per year.

If you have an emergency fund of 3–6 months of total expenses (including the new PITI), you're in much better shape to absorb the surprises that come with homeownership.

How to Find Your Comfortable Number

Start with what you want your monthly housing payment to be, not what a lender will let you borrow. Work backward from that number to a purchase price using current rates, expected down payment, and California property tax and insurance averages.

This approach flips the conversation: you choose the payment that fits your life, then shop within that range. The math takes minutes; the peace of mind lasts for the life of the loan.