Tax

The 83(i) Election: How Startup Employees Can Defer Tax on Equity for Five Years (and Why Almost Nobody Does)

Section 83(i) lets qualified startup employees defer federal income tax on vested equity for up to five years. Here's how the election works and its catch.

By 409.AI Team - 2026-07-29

# The 83(i) Election: How Startup Employees Can Defer Tax on Equity for Five Years (and Why Almost Nobody Does)

A senior engineer at a Series C company watches her restricted stock units finally vest. On paper, she just got richer. In practice, she owes the IRS a five-figure tax bill in cash, calculated on shares she cannot sell, in a company that won't go public for years. She has income she can't spend and a bill she has to pay from her savings.

This is the phantom income problem, and it has quietly punished private-company employees for a long time. In late 2017, Congress wrote a fix into the tax code. It's called the Section 83(i) election, it can defer that tax bill for up to five years, and almost no startup actually offers it. Here's what it does, who it's built for, and why it stays on the shelf.

The problem 83(i) was meant to solve

When you receive stock through equity compensation, the tax code usually treats it as ordinary income the moment it's yours to keep. For non-qualified stock options (NSOs), that moment is exercise, and the taxable amount is the spread between your strike price and the stock's fair market value. For RSUs, it's settlement, and the taxable amount is the full value of the shares.

At a public company, this is annoying but survivable, because you can sell some shares the same day to cover the tax. At a private startup, you usually can't. The shares are illiquid, there's no market, and the fair market value that drives your tax bill comes straight from the company's [409A valuation](https://409.ai/articles/what-is-a-409a-valuation-a-comprehensive-guide). So an employee can face a large, immediate, cash tax on paper gains that may take years to become real, or may never become real at all.

Section 83(i), added by the 2017 Tax Cuts and Jobs Act, lets qualified employees of eligible private companies elect to defer the federal income tax on that equity for up to five years. The rules apply to stock from options exercised, or RSUs settled, after December 31, 2017 ([RSM](https://rsmus.com/insights/services/business-tax/qualified-equity-grants-for-private-companies.html)).

What the election actually does

An 83(i) election doesn't erase the tax. It delays it. When you make the election, you recognize no federal income tax at vesting. Instead, the clock starts, and the tax comes due later when a specific triggering event happens.

Take a concrete case. Suppose your RSUs settle into 10,000 shares when your company's 409A puts the common stock at $8 a share. That's $80,000 of ordinary income. Without an election, you'd owe federal income tax on the full $80,000 this year, even though you can't sell a single share. With a valid 83(i) election, you defer the federal income tax on that $80,000 until an inclusion event occurs, which can be as far out as five years.

The mechanics differ from the more familiar [83(b) election](https://409.ai/articles/the-83b-election-explained-for-founders), which founders and early employees use to lock in tax on restricted stock while it's cheap. An 83(b) election accelerates recognition to the grant date. An 83(i) election does the opposite: it pushes recognition out. You can't use both on the same stock, and making an 83(b) election disqualifies you from 83(i) on those shares.

The 80% rule that keeps it rare

Here's where good intentions meet startup reality. To offer 83(i), a company has to be an "eligible corporation," which means it has no stock that's readily tradable on an established securities market, and it maintains a written plan under which at least 80% of all its U.S. employees are granted stock options or RSUs in the same calendar year ([RSM](https://rsmus.com/insights/services/business-tax/qualified-equity-grants-for-private-companies.html)).

That 80% test is stricter than it sounds. It's measured within a single calendar year, and grants from different years don't get added together to reach the threshold. The grants also have to carry the "same rights and privileges." A company can't hand RSUs to 70% of staff and options to another 10% to cobble together 80%; it has to be one type or the other. The number of shares can vary from person to person, but no eligible employee's grant can be more than a token amount ([Holland & Knight](https://www.hklaw.com/en/insights/publications/2019/03/section-83i-considerations-and-pitfalls-for-privat)).

Most startups don't grant equity this way. They concentrate options among engineers, executives, and early hires, not the receptionist and the entire sales floor in a single year. The 80% requirement asks companies to broaden their equity program in a way many boards never intended, which is the first reason 83(i) sits unused.

Who counts as a qualified employee

Even at a company that clears the 80% bar, not everyone can make the election. The law carves out the people who least need the break. A qualified employee cannot be someone who owned 1% or more of the company in the current year or any of the prior 10 years, cannot be the CEO or CFO (or their family members), and cannot be one of the four highest-compensated officers in the current year or any of the prior 10 years ([RSM](https://rsmus.com/insights/services/business-tax/qualified-equity-grants-for-private-companies.html)).

The design is deliberate. Section 83(i) targets rank-and-file employees who get hit hardest by phantom income, not founders and top executives who have other planning tools. If you're weighing early exercise and an 83(b) election on founder stock, that's a different playbook, and it interacts with things like [QSBS eligibility](https://409.ai/articles/qsbs-one-big-beautiful-bill-act-section-1202-changes) that top insiders think about anyway.

The 30-day window and what ends the deferral

The election is time-sensitive. An employee has to make it no later than 30 days after the first date the shares become substantially vested or transferable, whichever comes first. Miss the window and the option is gone for that tranche.

The deferral also isn't open-ended. Federal income tax comes due in the year the earliest of these inclusion events happens:

The stock becomes transferable, including a transfer back to the employer.
The employee becomes an excluded employee (for example, gets promoted into the top-officer group).
Any of the company's stock becomes readily tradable on an established securities market, which an IPO triggers.
Five years pass from the vesting date.
The employee revokes the election.

That IPO trigger matters. The whole point of 83(i) is to bridge the gap until liquidity, but going public ends the deferral immediately, even if you're still locked up and can't sell. A [tender offer or secondary sale](https://409.ai/articles/tender-offers-secondary-sales-409a-valuation) that makes your shares transferable can also close the deferral early.

The catch nobody mentions

Deferral sounds like a free lunch. It isn't, and the reasons are worth reading twice.

First, the taxable amount is locked in at the value when your shares vest, not when you finally pay. If your RSUs settle at an $8 valuation and the company craters to nothing over the next three years, you still owe federal income tax on that original $80,000 when the inclusion event hits. The election defers the timing of the tax, not the amount, so a decline in the stock doesn't shrink the bill. Deferring tax on gains that later evaporate is exactly the trap employees fear.

Second, only federal income tax gets deferred. Social Security and Medicare taxes (FICA) are still due at vesting, and states aren't required to follow the federal rule, so your state income tax may come due right away too ([RSM](https://rsmus.com/insights/services/business-tax/qualified-equity-grants-for-private-companies.html)).

Third, when the deferred tax finally comes due, the employer withholds at the top individual rate, currently 37%, regardless of your actual bracket. To secure that withholding, the deferral stock generally sits in escrow. An employee in a lower bracket effectively overpays up front and trues up on their return.

Section 83(i) also doesn't touch incentive stock options or shares from an employee stock purchase plan. Making the election on ISO shares strips their special tax treatment, which is usually the last thing an ISO holder wants. If you're comparing option types, the differences between [ISOs and NSOs](https://409.ai/articles/iso-vs-nso-how-stock-options-are-taxed) drive most of that decision before 83(i) ever enters the picture.

Why companies stay away

Employees can't elect 83(i) unless their employer sets up the program, and employers have real reasons to skip it. The 80% grant requirement forces a broader equity policy than most cap tables are built for. The escrow and top-rate withholding create payroll and administrative work. And the law adds a notice obligation: an eligible company has to tell qualifying employees the election is available, and each failure carries a $100 penalty, up to $50,000 a year, under Section 6652 ([Holland & Knight](https://www.hklaw.com/en/insights/publications/2019/03/section-83i-considerations-and-pitfalls-for-privat)).

Put those together and you get a benefit that's expensive to administer, easy to get wrong, and useful mainly to employees who aren't the ones setting company policy. That's why, years after it became law, 83(i) remains one of the least-used provisions in equity compensation.

Where the 409A sits in all of this

Whether or not 83(i) is on the table, one number sits underneath every piece of this: the company's 409A valuation. It sets the strike price on NSO grants, and it fixes the fair market value used to measure income when RSUs settle or options are exercised. A defensible, current 409A is what determines how large that phantom-income figure is in the first place, which is why the gap between a 409A price and a later round matters so much to employees. If you've ever wondered [why a 409A comes in below the post-money valuation](https://409.ai/articles/why-is-your-409a-valuation-lower-than-post-money-valuation), this is one of the places that gap shows up in real dollars.

For most startup employees, the practical takeaway is narrow but useful: if your employer offers an 83(i) program, run the numbers before you elect. The deferral helps only if you genuinely can't cover the tax now and you have real conviction the stock will hold its value, because the amount is fixed the day you vest. If you're a founder or an early hire, your real advantage comes earlier in the timeline, in the [83(b) election](https://409.ai/articles/the-83b-election-explained-for-founders) and the quality of your 409A, not in a deferral almost no company bothers to offer. Talk to a tax adviser before making any election; the deadlines are short and unforgiving.