*Important Distinction: This strategy is exclusive to Pass-Through Entities (LLCs, S-Corps, and Partnerships). If you are a C-Corp founder, you are playing a different game (see our post on QSBS). For everyone else, read on.*
For the last eight years, high-income founders in states like New York, California, and Massachusetts faced a punitive reality: the SALT Cap.
This provision limited your ability to deduct State and Local Taxes (SALT) to a mere $10,000 on your federal return. Effectively, you were paying federal tax on money you had already paid to the state. It was a tax on a tax.
As of January 2026, the landscape has shifted. The recently enacted OBBBA (One Big Beautiful Bill Act) raised the SALT cap to $40,000. While this is a win for the upper-middle class, it remains a "trap" for the truly successful business owner. If your business generates significant profit, your state tax bill will easily exceed $40,000, leaving you once again hitting a ceiling.
To solve this, we rely on structural alignment. This involves coordinating three distinct legislative provisions available to the Pass-Through founder: The Cap, The Workaround (PTET), and The Bonus (QBI).
1. The Ceiling: The SALT Cap ($40,000)
- The Trap: The cap applies to individuals. Since Pass-Through entities push all tax liability to the individual owner, you are the one stuck with the limit.
- The Math: If you earn $1M in a high-tax state (roughly 10% rate), your state tax bill is $100,000.
- The Problem: You can deduct the first $40,000. The remaining $60,000 is "phantom income" -- you never saw it (the state took it), but the IRS taxes you on it.
2. The Solution: PTET (Pass-Through Entity Tax)
This is the most powerful lever for high earners. It shifts the liability of state taxes from You (the individual, who is capped) to Your Business (the entity, which is uncapped).
- Who qualifies: Exclusively S-Corps, Partnerships, and LLCs taxed as such. (C-Corps don't need this because they already deduct state taxes as a standard business expense).
- How it works: Your company elects to pay the state tax bill directly.
- The Result: The state tax becomes a "Business Expense" (like rent or payroll) rather than an "Itemized Deduction." Business expenses are 100% deductible with no cap.
- The Benefit: In our example, your business pays the full $100,000. This lowers your federal taxable income by the full $100,000. The $60,000 that was previously "wasted" is now saved.
3. The Bonus: QBI (Qualified Business Income)
The Section 199A Deduction (QBI) is the exclusive reward for remaining a Pass-Through entity. It allows eligible business owners to deduct 20% of their net business income from their federal taxes.
- The Exclusivity: C-Corps are ineligible for QBI (they trade this deduction for a lower flat corporate rate).
- The Update: The 2025 Act made this permanent (it was set to expire). This is a massive win for S-Corp founders.
The Interaction: The Trade-Off
Sophisticated founders understand that these levers interact.
- When you use PTET to pay state taxes, you lower your business's "Net Income."
- Since QBI is calculated as 20% of "Net Income," your QBI deduction effectively shrinks slightly.
Is it worth it? Almost always.
- The Cost: You lose 20 cents of QBI deduction for every dollar of PTET paid.
- The Gain: You gain a full dollar of federal deduction for every dollar of PTET paid.
- The Verdict: Trading a 20-cent deduction for a dollar deduction is a winning trade every time.
The Bottom Line The new $40,000 SALT cap is a "feel good" measure for the public, but it is insufficient for the high-revenue founder.
- Ignore the Cap: Don't rely on the $40,000 limit.
- Elect PTET: Move the tax liability to the entity level to unlock 100% deductibility.
- Bank the QBI: Enjoy the permanent 20% deduction on the remaining profit.
This is the distinct advantage of the Pass-Through structure. If you aren't using these levers, you are paying C-Corp prices for S-Corp features.