Your local Sonoma County mortgage lender

Second home loans generally require at least 10% down for conventional financing, or around 15% down for jumbo loans. Rates run modestly higher than a primary residence. One rule applies no matter how you plan to use the place: you cannot use rental income from a second home to help you qualify. The payment has to fit your debt-to-income ratio on your other income alone, on top of whatever you're already carrying on your primary. For a lot of Bay Area buyers, that's the real constraint, not the down payment.

From there it depends on whether you intend to rent it.

If you're buying a place for your own use, the classification is straightforward. You need to occupy it for some portion of the year, and neither Fannie Mae nor Freddie Mac specifies a minimum number of nights. The Second Home Rider you sign at closing commits you to keeping the property available primarily for your own use for at least the first year. That's essentially the whole obligation. It's the most common version of a Sonoma County second home, and it's the path CJ took himself: he bought his Healdsburg house in 2006 as a personal second home and later relocated to Sonoma County full time.

If you do plan to rent it out when you're not there, that's allowed, and this is an area where a lot of loan officers still quote guidance that was retired years ago. Short-term renting is explicitly permitted. Freddie Mac's standard is that the home stays available primarily, meaning more than half the calendar year, for your personal use, which is where the 180-day rule of thumb comes from. Fannie Mae publishes no day count at all. What both prohibit is anything that takes the property out of your control: a mandatory rental pool, an agreement requiring you to rent, or a management company that controls the calendar. Individual lenders can also layer on stricter rules than either agency.

The line is between renting your place when you're not using it, which is generally fine, and running it primarily as a rental business on a second home loan, which is not. Crossing it can also cost you tax benefits you were counting on. Our blog post on how the loan you choose can disqualify the vacation rental tax deduction walks through that collision.

Either way, match the classification to how you'll actually use the property before you apply.

Yes, but the loan structure has to match the tax position, and the two get separated more often than you would think.

The strategy Bay Area buyers are running works like this: buy a permitted short-term rental, run an engineering-based cost segregation study, and take a large first-year depreciation deduction against W-2 income. It requires an average guest stay of seven days or less, material participation, and personal use kept under the greater of 14 days or 10% of the days the property is rented. That last requirement is where financing collides with taxes, because a conventional second home loan asks you to occupy the property and keep it available for your own use. Buy it as a second home, then run it as a business, and you have a loan you are not really complying with and a deduction that may not survive scrutiny.

Two Sonoma County specifics matter on top of that. Permits do not transfer when a property sells, and the county's exclusion and cap zones mean eligibility comes down to the parcel, not the town. A property that cannot legally operate as a vacation rental produces no rental income, which means no DSCR qualification and no tax benefit either. And the 2026 conforming limit here is $897,000, so down payment structuring on a $1 million-plus purchase can be the difference between high-balance conforming and jumbo pricing.

The full breakdown is in our article on financing Sonoma County and Palm Springs vacation rentals. CJ is a lender, not a CPA, so bring a real estate CPA in on the tax side. Just bring CJ in before you write the offer, not after.