What SALT Is

SALT stands for State and Local Tax. The SALT deduction allows taxpayers who itemize their federal return to deduct state income tax (or sales tax in lieu of income tax) plus property tax. Before 2018, this deduction was unlimited.

The 2017 Tax Cuts and Jobs Act capped this deduction at $10,000 per household ($5,000 if married filing separately). The cap applies to the combined total of state income tax + property tax.

Who the Cap Affects

The SALT cap most affects households in high-tax states (California, New York, New Jersey, Connecticut, Massachusetts, Illinois) with property tax + state income tax that easily exceeds $10,000.

Example: California

• Married couple, $250K income. State income tax: roughly $15K.
• Property tax on $1.2M home: roughly $13K.
• Total state and local tax: $28K.
• Pre-2018: full $28K deduction.
• Post-2017 (current): $10K cap. Lost deduction: $18K.
• At 24% federal marginal rate, lost benefit: $4,320/year.

For most retirees in low-tax states like Arizona, Florida, or Texas, the SALT cap rarely binds because total state and local tax is below $10,000 anyway.

The PTET Workaround for Pass-Through Business Owners

For high-earning pass-through business owners (S-corps, partnerships, multi-member LLCs), many states have enacted Pass-Through Entity Tax (PTET) workarounds. The mechanic: the entity pays state tax on the owner's share of business income directly. The state tax becomes a business deduction, sidestepping the personal SALT cap.

As of 2026, more than 30 states have enacted some form of PTET. The mechanics vary — some states require an annual election, some apply automatically. For business owners in high-tax states with significant pass-through income, the PTET election can recover most or all of the SALT cap deduction loss.

This is one of the most underused tax planning tools for high-income business owners. The annual savings from a PTET election can run $5,000–$50,000+ depending on income and state.

The 2026 Sunset Question

The SALT cap is part of the 2017 Tax Cuts and Jobs Act, which is scheduled to sunset after 2025 unless Congress acts. If the sunset takes effect, the SALT cap goes away and the unlimited deduction returns.

The political pressure to extend or modify the cap has been substantial — and outcomes uncertain. Possible scenarios include full sunset, full extension, partial increase (e.g., $20K cap), or marriage-penalty correction ($20K cap for married couples).

The planning implication: high-income, high-state-tax households should monitor 2026 legislation closely. A relocation decision (or a delay in a relocation decision) may depend on which scenario plays out.

Real Scenario: A Pre-Retiree Considering Arizona

A married couple in California, $300K income, $1M home. Combined California state income tax + property tax: ~$30K. SALT cap loss: $20K of deduction, costing roughly $5K/year in extra federal tax.

If they relocate to Arizona (where state tax is 2.5% flat and property tax on a comparable home is much lower), the SALT cap stops binding entirely. Combined Arizona state income tax + property tax falls under the $10K cap.

The relocation captures both the state-tax savings (lower overall rate) and the federal benefit recovery (no longer hitting the SALT cap). Combined annual benefit: $10K–$15K in this example.

The Itemize-vs-Standard-Deduction Math

The SALT cap interacts with the standard deduction. The 2017 TCJA roughly doubled the standard deduction, which means many households who used to itemize now take the standard deduction. For those households, the SALT cap is irrelevant — they aren't itemizing in the first place.

The cap binds for households whose itemized deductions (SALT + mortgage interest + charitable giving) still exceed the standard deduction. For 2025, the standard deduction is roughly $30,000 for a married couple. A household with $10K of SALT (capped) plus $15K of mortgage interest plus $10K of charitable giving = $35K of itemized deductions, beating the standard. Without the cap, that same household would have $35K + the additional state/property tax above $10K — a materially larger deduction.

Common Mistakes

• Assuming the SALT cap doesn't affect you without checking the actual state + property tax total.
• Missing PTET workarounds available for pass-through business owners.
• Not factoring SALT changes into multi-year relocation planning.
• Forgetting that the cap may sunset after 2025 — strategies that depend on the cap should account for that uncertainty.

The Bottom Line

The SALT cap is a $10,000 limit on the deduction for state income tax plus property tax on the federal return. It hits hardest in high-tax states with high property values.

For Arizona retirees, the cap is rarely the binding constraint. For pre-retirees still in high-tax states, the cap is one factor in the relocation cost-benefit analysis — and the PTET workaround is worth investigating for pass-through business owners.