A 42.5% DTI Will Get You Approved in California—But Here's the Number That Actually Gets You the House

Last Tuesday, a software engineer in Mountain View with a 780 credit score and $180,000 household income got denied for a $1.2 million home in Sunnyvale's 94087. His down payment was ready. His employment history was pristine. His debt-to-income ratio was 47.3%—four points above what the automated underwriting system would tolerate without compensating factors he didn't have.

The same week, a teacher in Sacramento's Tahoe Park neighborhood closed on a $485,000 bungalow with a 620 credit score, 3% down, and a DTI of 49.1%. The difference wasn't luck. It was loan selection and the precise sequencing of how those three numbers interact in California's 2026 mortgage landscape.

Forget what you learned five years ago. The math has changed.

Credit score sets the floor, but it's more nuanced than the 620 minimum you've heard repeated. For conventional loans through Fannie Mae or Freddie Mac—still the dominant pathway for California purchases between $400,000 and the conforming limit of $1,149,825 in high-cost counties like San Francisco, Orange, and Santa Clara—620 is technically the threshold. But that number unlocks only the most expensive pricing tier. At 620, you'll pay roughly 1.75 points more in loan-level pricing adjustments than a borrower at 740. On a $900,000 loan in San Jose, that's $15,750 in additional closing costs or a rate roughly 0.5% higher for the life of the loan.

The real magic number is 740. Above that, pricing adjustments flatten dramatically. Between 740 and 780, you'll see marginal improvements. Above 780, almost nothing changes. If you're sitting at 725 and closing isn't for 60 days, raising that score 15 points through paying down revolving balances below 10% utilization will save you more than negotiating $10,000 off the purchase price.

FHA loans play by different rules entirely. A 580 score gets you in at 3.5% down. Drop below 580 but stay above 500, and you're looking at 10% down—still possible, but a different financial equation in markets like Long Beach or Riverside where entry-level homes now average $625,000. That 10% down requirement means $62,500 cash versus $21,875 at the higher credit tier. For many buyers, the six months spent repairing credit is worth $40,000 in preserved liquidity.

Down payment requirements have become more flexible than most California buyers realize, but the tradeoffs are precise. Conventional loans now accept 3% down for first-time buyers through programs like HomeReady and Home Possible, but only if your income falls below 80% of area median income. In Los Angeles County, that's $86,400 for a household of two. In San Diego County, $91,200. Exceed those limits and you're back to 5% minimum, with 20% being the only path to avoiding private mortgage insurance that adds $200 to $400 monthly on a typical California purchase.

VA loans remain the most powerful tool available, requiring zero down payment with no PMI equivalent. In Oceanside, Vacaville, and other military-adjacent markets, VA purchases dominate—but veterans often don't realize their benefit extends to $1.5 million properties with no down payment in high-cost counties, provided they have full entitlement.

Now the number that actually determines approval: debt-to-income ratio. In 2026, conventional lenders will approve up to 45% DTI through automated underwriting, with some systems stretching to 50% when you have compensating factors—six months of reserves, credit scores above 720, or a larger down payment. FHA consistently approves up to 50% DTI with proper documentation.

Here's the calculation most buyers get wrong. They estimate their proposed mortgage payment using principal and interest only. Underwriters use the full PITI—principal, interest, property taxes, and homeowners insurance—plus HOA dues, PMI, and any Mello-Roos assessments common in California master-planned communities. That $4,200 monthly payment you calculated becomes $5,600 when the underwriter runs it.

The mistake that kills more California deals than any other: buyers add debt between pre-approval and closing. That new car lease, the furniture financing for the house you're about to buy, the paid-off credit card you closed—each one shifts your DTI or credit profile in ways that can crater a loan in final underwriting. The rule is absolute: change nothing financial between pre-approval and closing. Nothing.

This week, pull your credit report from annualcreditreport.com and calculate your current DTI using your gross monthly income and all minimum debt payments. Run the numbers at the specific California loan limit for your county—$766,550 for conforming in most areas, $1,149,825 in high-cost zones. If your DTI exceeds 43% on the home you want, you have exactly two levers: pay down debt or increase income documentation through bonus letters, rental income verification, or adding a co-borrower.

The teacher in Sacramento who closed with a 49.1% DTI and 620 score? She used an FHA loan with manual underwriting, documented 12 months of reserves, and showed three years of stable employment. The systems allow flexibility—but only for borrowers who understand which doors to knock on.

Every California mortgage approval is a negotiation between three numbers. The buyers who win are the ones who know which number to improve first.