Pass-through entity tax (PTET) elections for SALT cap workaround vary by state with incompatible deadlines and mechanics

What: Over 36 states have enacted pass-through entity tax (PTET) elections that allow S-corps, partnerships, and LLCs to pay state income tax at the entity level rather than the owner level, effectively converting a SALT-capped individual deduction into an uncapped business deduction. However, each state has different election deadlines (some require election before the tax year begins, others allow retroactive election), different payment schedules (quarterly estimates vs. annual), different credit mechanisms (refundable vs. non-refundable owner-level credits), and different rules on whether the election is binding or revocable — creating a 36-way compliance matrix that must be navigated annually. Why it matters: A multi-state LLC with owners in three states may need to evaluate and file PTET elections in each state under different rules and deadlines — so what? Missing a single state's election deadline (sometimes as early as March 15 of the tax year) locks out the SALT workaround for that entire year — so what? The tax savings from PTET elections can be $10,000-50,000+ for high-income pass-through owners, so a missed deadline is extremely costly — so what? The interaction between PTET deductions and other tax calculations (AMT, passive activity limitations, IRA eligibility) creates second-order effects that require sophisticated modeling — so what? Small business owners who would benefit most from the SALT workaround are the least likely to have the tax advisory resources to navigate the state-by-state complexity, effectively making this a tax benefit available only to those who can afford expensive CPAs. Structural root cause: The SALT deduction cap ($10,000, raised to $40,000 by OBBBA in 2025) was enacted at the federal level, but the workaround operates through state-level elections with no federal standardization. Each state designed its PTET regime independently, optimizing for its own revenue and political considerations rather than taxpayer simplicity. The IRS blessed the general concept (Notice 2020-75) without imposing any uniformity requirements.