How Much House Can I Afford in California? A Real Formula

The internet is full of affordability rules of thumb. Spend no more than 28% of your income on housing. Buy no more than three times your annual salary. These guidelines were created in a different era, in different markets, These broad rules may be too general for many California households.

The Two DTI Ratios That Matter

Lenders use two debt-to-income calculations. Front-end DTI measures housing costs as a percentage of gross monthly income. Back-end DTI measures all monthly debt obligations, including housing plus car payments, student loans, and credit cards, as a percentage of gross monthly income.

DTI is one part of a complete review. Requirements vary by program, lender and borrower profile. The ratios used in an educational budget are illustrative assumptions, not approval thresholds.

The Real Formula

Step 1: Calculate your gross monthly income. Annual salary divided by 12.

Step 2: Choose an illustrative share of gross monthly income for total debt payments, based on your budget. This is a budgeting assumption, not a lender maximum.

Step 3: Subtract current monthly debt obligations from that illustrative debt budget to estimate the housing-payment amount under your assumptions.

Step 4: Subtract your estimated property taxes, homeowners insurance, HOA dues and mortgage insurance, where applicable. Each cost varies by property and loan.

Step 5: Use the remaining illustrative principal-and-interest budget with a hypothetical rate and term entered by you. The result is educational, not a qualification decision.

A Real California Example

Use the affordability calculator to enter income, monthly debts, down payment, housing costs and a hypothetical interest rate. Compare the resulting educational amounts against savings goals and expected ownership expenses. The tool does not determine what a lender will approve.

Why Your Personal Comfort Number Matters More

A calculator result and your personal budget are different things. Factor in lifestyle, savings goals, childcare costs and irregular ownership expenses. Approval requires a separate lender review of your complete circumstances.