Why state comparisons need care
A state does not receive a SALT deduction; a taxpayer does. The federal calculation starts with state and local income tax or sales tax plus property tax paid, applies the federal cap, and then adds other itemized expenses. Two neighbors can reach different outcomes because their wages, residence, property, withholding, mortgage interest, and gifts differ.
The temporary cap is $40,000 in 2025 and $40,400 in 2026 before the income-based phase-down. That creates more room than the old $10,000 limit, but it does not turn every dollar of state tax into a federal deduction. The SALT calculator uses actual paid amounts and then asks whether itemizing beats the standard deduction.
State mechanisms at a glance
The comparison below is qualitative. It describes why a state may produce a larger or smaller SALT input without asserting an average bill or a guaranteed benefit for every resident.
| State group | Mechanism that can affect SALT | What the federal calculator still needs |
|---|---|---|
| California | State income tax and local/property tax patterns can create a sizeable combined SALT amount for some households. | The taxpayer's paid state/local tax, property tax, mortgage interest, and gifts |
| New York | State and local income-tax exposure can be significant, with property-tax differences by location. | Actual payments and the filing year's income and itemized expenses |
| New Jersey | Property-tax and state-tax choices can make the cap relevant for certain homeowners and earners. | Documented tax paid, not a statewide assumption |
| Illinois | State income tax and property-tax payments can combine differently by household. | Paid amounts plus the standard-deduction comparison |
| Texas, Florida, Washington | No individual state income tax shifts the SALT mix toward property tax and local taxes. | Property tax and any eligible local or sales-tax amount actually paid |
High-tax does not automatically mean itemize
A household may live in a state with high headline taxes and still have an itemized total below the standard deduction. The mortgage may be small, the property tax may be modest, or charitable gifts may not be part of the return. In that case, the larger SALT cap is available in theory but does not change the chosen deduction.
The reverse can also happen. A taxpayer with moderate SALT may cross the standard-deduction line after adding mortgage interest and charitable gifts. This is why the relevant comparison is not “my state has high taxes” versus “my state has no income tax.” It is the taxpayer's complete itemized total versus the standard amount for the filing status and year.
The 30% phase-down adds another layer for higher MAGI. In 2025, it begins above $500,000; in 2026, it begins above $505,000. The cap cannot fall below $10,000 under the temporary rule, and the statute returns to the $10,000 cap in 2030.
A record-based way to compare your state
Pull the year's property-tax statements, state and local tax records, and any sales-tax documentation relevant to the return. Then enter those amounts in the SALT calculator with mortgage interest and charitable gifts. Do not substitute a state ranking, a neighbor's result, or a property-tax estimate for the amount actually paid and deductible under the applicable rules.
The calculator reports SALT paid, the effective cap, SALT allowed, the itemized total, and the standard deduction as separate lines. That makes it possible to see whether the cap, the standard deduction, or the other itemized categories are controlling the outcome.
- Use your own paid tax records rather than a state-level average.
- Check the year's indexed cap and MAGI threshold.
- Add mortgage interest and charitable gifts only when you intend to itemize them.
- Ask a professional about sales-tax elections, PTET, and state conformity questions not modeled here.