The SALT Deduction Cap: $10,000 Limit, PTE Workarounds, and Sunset Risk

A Cap That Reshaped High-Tax States

Before 2018, taxpayers who itemized could deduct the full amount of state and local taxes paid — property taxes, state income taxes, or state sales taxes — against their federal taxable income. The Tax Cuts and Jobs Act of 2017 capped that deduction at $10,000 per return ($5,000 for married filing separately) starting January 1, 2018. The cap applies regardless of filing status for joint filers, creating a de facto marriage penalty for high-income couples in high-tax states. A married couple in New York City paying $40,000 in combined state, city, and property taxes now deducts only $10,000 federally — a permanent $30,000 increase in federal taxable income compared to the pre-TCJA regime.

The Fiscal Geography of SALT

The SALT cap is not a nationally uniform policy burden. It falls disproportionately on high-income residents of states with high income and property taxes: California, New York, New Jersey, Connecticut, Illinois, and Massachusetts account for the majority of SALT-related federal revenue increases. The nonpartisan Tax Policy Center estimated the cap raised federal revenue by approximately $77 billion in 2018 alone. The political framing followed geographic lines: Republican-led states with lower taxes saw little impact, while Democratic-leaning states with high public services and correspondingly high tax burdens absorbed the full effect.

IRS Notice 2020-75 and the PTE Workaround

Pass-through entity (PTE) tax workarounds emerged as the dominant planning response. The mechanism exploits a gap in the SALT cap: the $10,000 limit applies to individual taxpayers, not to businesses. A partnership or S-corporation can elect to pay state income tax at the entity level. The entity deducts that payment as a business expense — not subject to the $10,000 cap — reducing federal ordinary income flowing to partners or shareholders. Those owners then receive a state tax credit on their individual returns, offsetting the state tax that was paid on their behalf.

The IRS validated this approach in Notice 2020-75, issued November 9, 2020, confirming that properly structured PTE elections produce a legitimate federal business deduction. By 2024, more than 35 states had enacted PTE tax legislation. The workaround is most valuable for partnerships and S-corporations owned by high-income individuals in high-tax states. Wage earners cannot access it — the benefit flows only through entity-level income.

• The PTE election is typically made annually and may be irrevocable once made for the tax year — timing matters.
• Credit structures vary by state; some states provide a refundable credit, others non-refundable — owners may still owe state tax depending on structure.
• The IRS has reserved the right to challenge abusive arrangements; straight-forward PTE elections consistent with Notice 2020-75 remain safe.
• Sole proprietors cannot use a PTE workaround — the strategy requires a separate legal entity (partnership or S-corp).

Behavior Changes: Itemizing vs. Standard Deduction

The TCJA simultaneously doubled the standard deduction ($29,200 for married joint filers in 2024), which interacts with the SALT cap to push many middle-income itemizers onto the standard deduction. A taxpayer with $10,000 SALT, $12,000 mortgage interest, and $3,000 charitable giving has $25,000 in potential itemized deductions — below the $29,200 standard deduction. Pre-TCJA, that same taxpayer with uncapped SALT might have had $35,000 in itemized deductions, creating real federal tax benefit from itemizing. Charitable giving behavior shifted noticeably: donor-advised funds and bunching strategies — consolidating two years of giving into one tax year to clear the standard deduction threshold — became more popular after 2018.

• Bunching charitable contributions every other year can restore itemized deductions above the standard deduction threshold.
• Home equity interest deductibility was also narrowed by TCJA — only interest on acquisition indebtedness up to $750,000 (new mortgages) qualifies.
• Taxpayers with large mortgage interest and significant charitable contributions feel the SALT cap least acutely.
• Wealthy retirees with no mortgage and high property taxes are often the hardest hit by the cap.

The Sunset Cliff: What Happens in 2026

The TCJA's individual provisions, including the SALT cap, were enacted with a sunset date of December 31, 2025. Without congressional action, the cap expires on January 1, 2026, restoring the unlimited SALT deduction. The fiscal cost of full repeal is substantial: the Joint Committee on Taxation estimated extending the SALT cap saves approximately $900 billion over ten years compared to permanent repeal. Congress faces a binary choice — extend, modify, or allow the cap to expire — as part of a broader budget reconciliation debate over the full slate of expiring TCJA provisions.

Planning Uncertainty and the Timing Problem

Tax planning around the SALT cap faces a fundamental timing problem: multi-year financial decisions — purchasing a home, relocating a business, choosing a filing state — must be made before Congress resolves the sunset question. Taxpayers who relocated from California to Texas partly in response to the SALT cap could find the original deduction restored by the time they complete the move. The PTE workaround itself faces legislative risk: a reinstated unlimited SALT deduction would eliminate the tax advantage of the PTE election, though it would not otherwise harm businesses structured around it. Flexibility is the key planning posture as the sunset date approaches. Avoid locking into irrevocable structures solely on the assumption that the current cap persists.

This article is for informational purposes only and does not constitute financial or tax advice.