There is a section of the federal tax code that can exclude a portion of the gain on certain private company stock from federal income tax. Not defer it. Not convert it to a lower rate. Exclude it.

Most of the people it could conceivably apply to have never heard its name. The ones who have heard of it usually learn about it in the week they are selling, from a lawyer in a data room, which is roughly the moment it stops being actionable.

I am not going to tell you that you qualify. I have no idea, and neither does anyone who has not examined your company’s entity history, your specific shares, when and how you acquired them, and what the company’s balance sheet looked like at the time. The eligibility rules are intricate and they have moved in recent legislation, with different treatment depending on when stock was issued.

What I can do is tell you the provision exists, describe the shape of the tests, and give you the questions to put in front of a CPA while there is still time for the answers to matter.

What the exclusion is, in plain terms

The provision is commonly called QSBS, short for qualified small business stock. It sits in section 1202 of the Internal Revenue Code.

The concept: if stock in a qualifying company is acquired in a qualifying way and held for a qualifying period, some or all of the federal capital gain on a later sale can be excluded from income, subject to a cap.

Every word in that sentence is doing work. The company has to qualify. The stock has to have been acquired in a particular manner. The holding period has to be satisfied. And the excludable amount is limited by a cap defined in statute rather than by your circumstances.

Recent federal legislation changed several of the governing parameters, including how the holding period works and how the caps and company-size thresholds are set, with the changes applying based on when the stock was issued. That means two employees at the same company, with the same job, holding stock from different years, can face different rules. Do not rely on a figure you read in an article from a few years ago, and do not rely on the figures in this one, because I have deliberately not stated them.

The tests, described rather than applied

Here is the general shape of what gets examined. Each of these is a question for your CPA about your actual facts, not a checklist you can clear on your own.

  • Entity type. The provision applies to stock in a domestic C corporation. Companies that were, or are, structured as LLCs or S corporations raise questions about whether and when qualifying stock came into existence.
  • How you acquired the shares. The stock generally has to have been acquired at original issuance from the company, in exchange for money, property, or services, rather than purchased from another shareholder.
  • Company size at the time of issuance. There is a gross assets test measured around the time the stock was issued. A company that has grown substantially may have crossed the threshold, which can affect stock issued later even when earlier stock was fine.
  • Type of business. Certain fields are excluded by statute. Most software and product companies are not in the excluded categories, but the line is not always obvious and it is not a judgment call for the shareholder to make.
  • Holding period. There is a required holding period, and recent legislation introduced tiered treatment for stock acquired after a specified date, where a longer hold can produce a larger exclusion. The date your holding period actually starts is a technical question and is frequently misunderstood.
  • The cap. The amount of gain that can be excluded is limited, and the limit is defined per taxpayer and per issuing company.

I have described each of these without numbers on purpose. The thresholds, the percentages, the holding periods, and the caps are exactly the details that changed, and a stale figure repeated confidently is worse than no figure at all.

Where the holding period actually starts

This is the item that connects most directly to decisions you may be making right now.

If you hold options, the clock for a holding period does not generally begin when the options are granted. It begins when you acquire the stock, which for an option holder means exercise. An employee sitting on vested options for years may have a long tenure at the company and no holding period at all, because they have never owned a share.

That is a reason to understand the rules early, not a reason to exercise. Exercising is a purchase with real cash and real risk, which is the whole subject of the recent piece on what early exercise actually costs. A potential tax benefit that depends on an uncertain future sale, at a company that may never have a liquidity event, is not by itself a basis for writing that check. Bring both questions to the same conversation with your CPA.

The mistakes that forfeit it without anyone noticing

Almost nobody loses this by making a dramatic error. They lose it by making a reasonable decision without knowing the provision existed.

Selling in a tender offer before a holding period is met is the most common one I encounter. A liquidity window opens, the price looks good, the participation cap is generous, and the decision gets made entirely on the merits of the sale. That may still be the right call, as we discussed in the recent piece on how to think about a tender offer. But a shareholder who has never asked the question does not know what the sale is costing beyond the ordinary tax, and the answer can be material.

Buying shares from another shareholder is the second. Secondary purchases can look identical to a direct purchase from the outside and can be treated differently for this purpose. If you have acquired shares from a departing colleague or through a secondary platform, that is a fact worth surfacing.

Company-level events are the third category, and they are the ones you cannot see. Entity conversions, certain redemptions and repurchases within defined windows, and reorganizations can all bear on the analysis. You will not learn about any of them from your equity portal.

And the fourth is documentation. Whatever the answer turns out to be, someone will eventually have to substantiate it: the acquisition date, how the shares were acquired, your basis, and the company’s status at the time. Grant documents, exercise confirmations, and any company-provided attestation are worth keeping in one place now, while they are easy to obtain. People change jobs, and portals get shut off.

What to actually do with this

You cannot resolve this yourself, and you should be skeptical of anyone who resolves it for you in a single conversation without documents.

Take these questions to a CPA with private company and equity compensation experience, ideally well before any liquidity event is on the horizon.

  • Given what I hold and how and when I acquired it, is there any possibility this provision applies to me, and what would need to be true?
  • When does my holding period start, or has it not started?
  • What documentation should I be collecting now, and can the company provide an attestation of its status?
  • How does California treat this, and what does that mean for me as a California resident? State treatment does not necessarily follow the federal rules, and for a Bay Area household that difference matters, which is part of the broader point in the piece on why the Bay Area high earner’s tax situation is different.
  • Do any planning structures apply to my situation, and are they worth the cost and complexity in my case?
  • What decisions in the next twelve months, including participating in a liquidity program or exercising options, would change the answer?

That last question is the one worth the meeting on its own. It is also the reason to have the conversation now rather than during a transaction, when the answers stop being useful. The article on selling concentrated stock without a giant tax bill covers the adjacent decisions this tends to sit alongside.

The point of knowing about it

You may not qualify. Many people do not, for reasons that have nothing to do with anything they did wrong.

But there is a meaningful difference between not qualifying and never having asked. The first is an outcome. The second is a decision you made without knowing you were making it, and it is the one I would like to see fewer people in this industry make.

Find out whether the question applies to you while the answer can still change what you do.