California's passthrough entity tax election: how Santa Barbara S-corps save thousands

California's passthrough entity (PTE) tax election — enacted under AB 150 — is one of the most underused planning opportunities for small business owners in Santa Barbara County. For S-corp shareholders with significant California income, it can save thousands of dollars per year. The problem is that the election has strict timing requirements and several traps that catch people off guard. Here's what you need to know.

The problem: the federal SALT cap

The 2017 Tax Cuts and Jobs Act capped the federal deduction for state and local taxes (SALT) at $10,000 per year for individuals. Before the cap, high-income California taxpayers could deduct their full California income tax bill — which can easily reach $30,000–$100,000+ for business owners — on their federal return.

The cap hit California business owners particularly hard, since California's top marginal rate of 13.3% makes it one of the most expensive states for high earners. The $10,000 cap effectively ended a significant federal deduction for most profitable California S-corp shareholders.

The solution: the California PTE election

California responded to the SALT cap with the passthrough entity tax, enacted in AB 150 (2021). The mechanics are straightforward:

• The S-corp (or partnership) pays a California entity-level tax of 9.3% on its net California income
• This entity-level tax is fully deductible on the federal return as a business expense — not subject to the $10,000 SALT cap, because it's paid by the entity, not the individual
• California then gives each shareholder a dollar-for-dollar credit on their personal California return for their share of the PTE tax paid

The net result: shareholders get a federal deduction for California taxes that was previously capped, while being roughly neutral on their California return (the PTE tax they owe is offset by the credit they receive).

Who benefits most from the California PTE election

The PTE election provides the most benefit to:

• S-corp shareholders whose California income tax significantly exceeds $10,000 (which covers most profitable Santa Barbara business owners)
• Shareholders in the 32%, 35%, or 37% federal brackets — the higher your federal rate, the more valuable the additional deduction
• Partnerships and LLCs taxed as partnerships are also eligible

The election provides less benefit (or no benefit) to shareholders who are already below the SALT cap on other state taxes, or who are in lower federal brackets where the deduction is worth less.

The timing problem: why this catches people off guard

The California PTE election requires estimated tax payments to be made by specific deadlines — and the current rules require that the majority of the annual PTE obligation be paid by June 15 of the tax year to get the federal deduction in that same year.

That means if you're planning to elect PTE for tax year 2026, you need to have made a qualifying estimated payment by June 15, 2026 — before you even know what your full-year income will be. This is the trap that causes many business owners to miss the benefit for a given year entirely: they think about it in January when preparing the prior-year return, not in May or June when the payment is due.

How David Rachford CPA handles PTE for Santa Barbara clients

For eligible S-corp clients, I build the PTE election into the year-round planning calendar rather than treating it as an afterthought at tax time. That means:

• Estimating the optimal PTE payment amount in late spring, based on projected full-year income
• Coordinating the June 15 estimated payment with your cash flow planning
• Modeling the full-year tax impact so you know exactly what the PTE election saves you in real dollars before the payment is due
• Integrating the PTE election with your officer salary, QBI deduction, and retirement plan contributions for a complete picture

Common mistakes with the California PTE election

Missing the June 15 payment deadline

If you don't make a qualifying estimated PTE payment by June 15, you may not be able to claim the election benefits for that year. This is the most common and most costly mistake.

Underpaying the estimate

If your full-year income comes in higher than you estimated, you may underpay the PTE tax and owe the remainder — plus California underpayment penalties. Building in a reasonable buffer is important.

Assuming the election carries forward automatically

The PTE election must be made each year. It doesn't roll over from prior years — you must actively elect and pay each year to receive the benefit.

Ignoring the interaction with AMT

For shareholders subject to the federal alternative minimum tax, the additional SALT deduction generated by the PTE election may be partially offset by AMT exposure. This is relatively rare but worth modeling for high-income clients.

Is the California PTE election permanent?

The current law ties the PTE election to the federal SALT cap — if Congress allows the SALT cap to expire or raises it significantly (the $10,000 cap is scheduled to expire after 2025 under current law, though the outcome remains uncertain), the benefit of the PTE election changes. As of 2026, the SALT cap has been extended under current federal law, and the PTE election remains a significant planning tool for California business owners.

I monitor the federal legislative landscape and update clients when changes affect the calculus — this is exactly the kind of thing that shouldn't catch you by surprise in April.

This post is for general informational purposes and does not constitute tax advice. Tax law changes frequently — consult a licensed CPA before making decisions about the California PTE election for your business.