How Much House Can I Afford in San Francisco County, California?

Estimate how much home you could afford based on your household income, down payment, mortgage rate, property taxes, and homeowners insurance — then compare it against San Francisco County's typical home value.

Home Affordability Estimator — San Francisco County

Enter your annual household income to estimate the home price that may fit within a 36% housing-cost ratio. We've pre-filled an example figure below — enter your own income to personalize the estimate.

Annual household income

Down payment

Mortgage rate assumption: 6.95% — Freddie Mac Primary Mortgage Market Survey (30-Year FRM), as of 2026-09-17

Estimated property tax: based on San Francisco County's 0.72% effective rate

Insurance assumption: 0.50% of home value/year (national assumption)

PMI assumption: 0.75% of loan amount/year (applies below 20% down)

Estimated affordable home price

$1,423,649

Estimated monthly payment

$11,400

Principal & interest: $9,094
Est. property tax: $854
Insurance: $593
PMI: $859

This is a simplified rule-of-thumb estimate based on gross household income only — existing debts (car loans, student loans, credit cards, etc.) are not modeled. Not a lender underwriting calculation or a pre-approval amount.

Compared with San Francisco County's typical home value

Typical home value (Zillow ZHVI, 2026-08-31): $1,424,486

1-year change: +13.7%5-year change: +1.8%

What income is needed for a typical San Francisco County home?

Based on the same assumptions, a household would need approximately $380,223 in annual income to support the typical $1,424,486 home at a 36% housing-cost ratio.

San Francisco County property taxes

Estimated property tax: based on San Francisco County's 0.72% effective rate.

See the full California Property Tax Estimator →

Assumptions used in this estimator

Mortgage rate assumption: 6.95%: Freddie Mac Primary Mortgage Market Survey (30-Year FRM), as of 2026-09-17. This is a national average, not a rate quote — your actual rate will vary by credit score, loan type, and lender.
Insurance assumption: 0.50% of home value/year: Estimated annual homeowner's insurance (0.50% of home value)
PMI assumption: 0.75% of loan amount/year: Estimated annual Private Mortgage Insurance (0.75% for down payments under 20%)
Housing-cost ratio: 36% of gross income: A simplified rule-of-thumb applied to gross household income only. Existing debts (car loans, student loans, credit cards, etc.) are not modeled. This is not a lender underwriting calculation.

This calculator is for informational purposes only and does not constitute tax advice. Consult a qualified tax professional for your specific situation. Rates last verified 2026-09-24.

Verify rates on Zillow Research ZHVI — smoothed, seasonally adjusted, all-home mid-tier

How we estimate this

annual income × 36% = maximum monthly housing payment
− estimated property tax − insurance − PMI (if down payment < 20%)
= available principal & interest → estimated affordable home price

The 36%ratio is a simplified rule of thumb, not an underwriting model — it doesn't account for other debt, credit score, HOA, utilities, maintenance, or lender-specific requirements. No debt-to-income input is used; the ratio applies to gross household income only.

Frequently asked questions

Is this a San Francisco County home affordability calculator or an estimator?

This is an estimator, not a calculator. It applies a 36% housing-cost ratio to your gross annual income, then subtracts an assumed property tax, insurance, and (if applicable) PMI amount to work out an estimated affordable home price for San Francisco County, California. That's a simplified rule of thumb, not a lender's underwriting decision.

Why is this an estimate instead of an exact number?

San Francisco County's effective property tax rate is real, county-specific data. The mortgage rate, insurance, and PMI figures are national assumptions, and the 36% ratio applies to gross income only — existing debts aren't factored in. Your actual affordable price will vary based on your credit, loan type, lender, and personal finances.

Where does this data come from?

San Francisco County's typical home value comes from Zillow Research's Home Value Index (ZHVI). Its property tax rate comes from the U.S. Census Bureau's American Community Survey, as compiled by the Tax Foundation. The mortgage rate assumption comes from Freddie Mac's Primary Mortgage Market Survey (PMMS).

Why are home prices so far above the affordable range in San Francisco County?

San Francisco County's typical home value is well above the national median. High-cost counties like this typically have housing supply that hasn't kept pace with demand, which pushes prices above what a household earning a typical income can afford at conventional lending ratios. That gap between typical income and typical home price is real and shows up directly in the estimate above.

Related calculators

California Property Tax Estimator California Home Affordability Estimator