A few years ago, pass through entity tax elections looked like one of those rare tax moves that felt almost too good to pass up.

If you owned an S corp or a partnership in a high tax state, the pitch was simple. Have the business pay state income tax at the entity level, deduct it federally, and work around the SALT cap that crushed the value of state tax deductions for a lot of owners. Clean. Legal. Smart.

Say you owned half of an S corp and sold your stake for $2 million. In the years before the sale, the business made PTET payments totaling $70,000. Those payments produced federal tax savings along the way. On paper, it looked like a clear win.

Then the sale happens, and the math changes.

Those PTET payments may have reduced your basis in the business. That means your taxable gain on the sale could be higher by the same $70,000. At a 20% federal capital gains rate, that is another $14,000 of tax. The benefit you thought you locked in does not fully disappear in every case, but it can shrink fast, especially when the real cost only shows up later.

That is the part many owners missed between 2021 and 2024. PTET was often framed as an easy workaround to the SALT cap. In some cases, it was. But once basis adjustments, exit events, distributions, and state specific rule changes enter the picture, the result can look a lot less generous than the original sales pitch.

This article breaks down where that surprise comes from, who is most exposed, and how to think about PTET when a sale or large liquidity event is on the horizon.

Why PTET Looked So Good

The basic pitch was easy to understand.

After the 2017 tax law capped the federal deduction for state and local taxes at $10,000, high-tax states started offering PTET programs. Instead of paying state income tax only on your individual return, the pass-through business could elect to pay that tax at the entity level. The entity deducted the payment federally, and the owner typically got a state tax credit or similar benefit on the personal return.

That structure mattered because the deduction moved from the capped individual return to the entity return.

The IRS gave this framework a green light in Notice 2020-75. That is why PTET spread so quickly and why so many accountants treated it as an easy win.

For a while, that framing largely worked. Owners in high-tax states often got real federal tax savings in the year the PTET was paid.

The Hidden PTET Cost Is Basis

This is where the math gets less friendly.

Basis is your tax investment in the business. In plain English, it is the number the tax code uses to track how much value you already have in the entity. When basis goes down, taxable gain can go up later.

According to the research provided, IRS Notice 2024-47 clarified that PTET payments reduce outside basis. That matters because lower basis does not always hurt you right away. It tends to hurt when you have a transaction that forces the issue, like a sale or a large distribution.

Hypothetical example: Assume you own half of an S corp and sell that stake for $2 million. Before factoring in PTET, your basis is $500,000. If the business made $70,000 of PTET payments that reduced your basis, your basis drops to $430,000, and your taxable gain rises by the same $70,000.

That does not automatically erase the earlier federal savings. But it can shrink them, and sometimes that is the whole surprise. What looked like a clean annual tax break can turn into a deferred tax cost.

When PTET Basis Reduction Actually Hurts

This issue matters most in two situations.

Selling the Business

If you are heading toward an exit, basis becomes very real very fast.

A lower basis means a higher taxable gain on the sale. That changes the true after-tax value of the PTET election. The annual savings may still be worth it, but they are no longer the full story.

That is why PTET can feel great in the years you elect it, then suddenly feel less exciting when the sale documents are on the table.

Taking Large Distributions

Basis also matters when the business distributes cash.

Distributions are generally tax-free up to your basis. Once distributions go beyond basis, the excess can become taxable gain. So if PTET pushed your basis lower than expected, distributions that looked harmless may carry tax consequences.

This is the quieter version of the problem. A sale gets attention. Basis erosion from routine distributions often does not.

PTET Pitfalls That Catch People Off Guard

A few mistakes show up again and again around this issue.

Treating PTET as a Year-by-Year Decision

A lot of owners looked only at the current-year federal savings.

That misses the real tradeoff. PTET may help on the front end and still create a back-end cost through lower basis.

Ignoring Basis Before a Sale

This is the big one.

If the business is likely to be sold in the next few years, the PTET election is not just about annual deductions. It is also about what happens to gain recognition when the exit arrives.

Forgetting That Distributions Use the Same Basis

Some owners think the risk appears only on sale.

It does not. Large distributions can expose the same problem sooner, especially if basis was already thin before PTET entered the picture.

Assuming the Original PTET Pitch Is Still the Whole Story

“Work around the SALT cap” was a strong pitch, and in many cases it was true.

But once basis reduction enters the analysis, the right question changes. It is no longer just “Did PTET save tax this year?” It becomes “Did PTET improve the full after-tax outcome once we include the exit or distribution picture?”

Worth Looking Into

A good starting point is the total PTET paid over the years you elected in. That gives you the number most likely to matter for basis.

It is worth checking whether a sale, recap, or large distribution is realistically on the horizon. PTET looks different when liquidity is close.

It is worth looking at your current basis, not just your current tax savings. That is the number many owners did not focus on when PTET first became popular.

It is also worth checking whether your state’s PTET rules have changed or are still changing. This article is about basis, but the state-level rules can still affect whether the election remains attractive.

PTET is not necessarily a bad move. It is just no longer smart to talk about it as if the savings are automatic, permanent, and untouched by what happens later.

Got questions about PTET, basis, or how this tradeoff works in real life? Drop them in the comments.

Disclosure: This is educational content from Silly Money, not tax, legal, or investment advice. Taxes are complicated and your situation is unique. Talk to a qualified professional before making decisions based on anything you read here.