Equity appreciation units, often called EAUs, are a contractual right to a future cash payment equal to the growth in a company’s per-unit value above a base price set on your grant date. You never own shares, membership interests, or any piece of the company. If the per-unit value climbs from $10 at grant to $50 at settlement, you get $40 per unit in cash. If the value stays flat or falls, you get nothing. Private companies and LLCs use these awards to give key employees financial upside similar to ownership while keeping the capitalization table clean.
The payout is always taxed as ordinary income, and the whole arrangement lives under Section 409A of the Internal Revenue Code. Get the design or the timing wrong and the penalties land on you, not on the company that drafted the plan. The details of each stage matter.
What an EAU Gives You
An EAU is a promise, not property. You receive no voting rights, no dividend distributions, and no ownership stake. The company issues no new equity, so there is no dilution and nothing to add to its cap table. That is the entire appeal for the employer.
Because nothing transfers to you at grant, EAUs are a form of synthetic equity, sometimes called phantom equity. They are especially common in LLCs taxed as partnerships, which cannot issue traditional stock options. A corporation might reach for Stock Appreciation Rights to achieve a similar effect, but the tax mechanics are not identical.
How EAUs Differ From Similar Awards
Three instruments look like EAUs on the surface. Knowing which one you actually hold changes the tax picture.
Stock Appreciation Rights (SARs) work almost the same way, paying the increase in value above a base price. The difference is structural: SARs are used by corporations and reference actual stock, and when the exercise price is set at or above fair market value on the grant date, they can be exempted from Section 409A entirely.
Full-value phantom stock pays out the entire per-unit value at settlement, not just the appreciation. A phantom unit worth $50 at settlement pays $50; an EAU with a $10 base pays $40 on the same unit. Phantom stock plans sometimes also include dividend-equivalent payments. EAUs typically do not.
Profits interests are different in kind. A profits interest in an LLC makes you an actual member, which means a Schedule K-1, possible tax on allocated income before any cash reaches you, and the full weight of partnership taxation. The trade-off is that a properly structured profits interest can produce long-term capital gains on the growth. EAU payouts cannot. They are ordinary income, always.
The Grant Agreement and Base Price
Everything starts with a written grant agreement. It specifies the number of units, the base price, the vesting schedule, the events that trigger settlement, and what happens if you leave. It is a binding contract, and there is no statutory fallback if it is vague. Read it closely.
The base price is the starting line for measuring appreciation, and it must reflect the fair market value of the company’s equity on the grant date. For a private company, the Section 409A regulations offer three safe harbor methods to establish that value: an independent appraisal (good for up to 12 months), a formula-based valuation applied consistently across equity transactions, or, for startups less than 10 years old with no publicly traded stock and no expected change-of-control within 90 days, a valuation by someone with relevant knowledge and experience, including a company insider.
If the IRS later finds the base price was set below fair market value, the units are treated as creating a deferral of compensation from day one. That triggers the 409A penalty regime, and the penalties fall on you.
Vesting
Vesting is how the company keeps you around. Until units vest, you have no right to any payout, no matter how much value has been created. Leave early and unvested units are gone.
Time-based vesting is standard, typically ratable over three to five years with a one-year cliff. Nothing vests during your first year; leave at month eleven and you walk away with zero. Performance-based vesting ties earning units to milestones like a revenue target or a closed deal. Plans often combine both.
One point that trips people up: vesting gives you the right to a future payout, not the payout itself. Vested units cannot be cashed in at will. Payment happens only when a qualifying settlement event occurs.
When You Actually Get Paid
Because EAUs are nonqualified deferred compensation, Section 409A strictly limits when the company can pay. The plan must specify one or more of six permissible payment triggers, and the company cannot deviate:
- Your separation from service
- Your becoming disabled
- Your death
- A fixed date or schedule set in the plan
- A change in ownership or control of the company, such as an acquisition or IPO
- An unforeseeable emergency
The plan cannot let you request payment on demand, and the company cannot accelerate payment outside narrow regulatory exceptions. That rigidity is the price of tax deferral. Most EAU plans tie settlement to a change-of-control event, because that is when the company has liquidity. Some also allow payment on separation or on a set date, but whichever it is, the choice is locked in when the plan is drafted.
How the Payout Is Calculated
The math is simple. Multiply your vested units by the difference between current fair market value and your base price. With 1,000 vested units, a $10 base, and a $50 settlement value, the gross payout is $40,000.
The vast majority of plans settle in cash as a lump sum. A minority settle in equity, and if you receive shares or membership interests, the tax treatment at receipt is the same as a cash settlement.
How the Income Is Taxed
Nothing is taxable at grant. Nothing is taxable at vesting. You have received only a contractual promise, not cash or property, so no income event has occurred.
At settlement, the entire payout is taxed as ordinary income at your marginal federal rate. There is no long-term capital gains treatment available, no matter how long you held the units. This is compensation income, not investment income.
For employees, the company reports the payout on Form W-2 in Box 1, aggregated with your other wages for the year, and withholds federal income tax, state income tax where applicable, and payroll taxes before releasing the net. For independent contractors or non-employee directors, the same amount appears on Form 1099-NEC in Box 1.
FICA Attaches Earlier Than You Might Expect
Social Security and Medicare taxes do not wait for the payout. Under the special timing rule for nonqualified deferred compensation, FICA is owed at the later of when you perform the services or when the right is no longer subject to a substantial risk of forfeiture. In practice, that means FICA attaches at vesting, not at settlement.1eCFR. 26 CFR 31.3121(v)(2)-1 – Treatment of Amounts Deferred Under Certain Nonqualified Deferred Compensation Plans
The FICA taxable amount at vesting is based on the present value of the deferred amount at that time, which is usually lower than the eventual payout. Paying FICA earlier on a smaller number can work in your favor, especially if the vesting-year amount stays under the Social Security wage base, since Social Security tax is capped and Medicare tax is not.
If the employer misses the special timing rule at vesting, the regulations require FICA to be assessed on the full benefit when it is paid. That fallback usually costs more in total.1eCFR. 26 CFR 31.3121(v)(2)-1 – Treatment of Amounts Deferred Under Certain Nonqualified Deferred Compensation Plans
Section 409A Penalties Fall on You
Section 409A is the single most important regulatory constraint on EAUs, and the penalties for a violation fall on the recipient even though the company designs the plan. Sit with that for a moment. If your employer botches the plan document or misses an operational deadline, you pay.
A violation happens when the plan fails a design requirement (such as specifying permissible payment triggers) or an operational requirement (such as actually paying on the dates the plan specifies). When one is found, three things happen at once:
- All vested deferred compensation under the plan becomes taxable in the current year, whether or not you received any payment.2Office of the Law Revision Counsel. 26 USC 409A – Inclusion in Gross Income of Deferred Compensation Under Nonqualified Deferred Compensation Plans
- You owe an additional 20% tax on top of regular income tax on that amount.3Office of the Law Revision Counsel. 26 USC 409A – Inclusion in Gross Income of Deferred Compensation Under Nonqualified Deferred Compensation Plans
- The IRS charges premium interest at the standard underpayment rate plus one percentage point, running from the year the compensation was first deferred or first vested (whichever is later) through the year of the violation.3Office of the Law Revision Counsel. 26 USC 409A – Inclusion in Gross Income of Deferred Compensation Under Nonqualified Deferred Compensation Plans
Concretely: $200,000 in vested deferred compensation with a 409A violation means income tax on the full $200,000 that year, a $40,000 penalty tax, plus interest reaching back to the original deferral date. The combined hit can easily exceed half the award’s value.
Common violations include setting the base price below fair market value, failing to specify permissible payment events, and paying on a timeline that departs from the plan document. You cannot fully audit compliance yourself, which is why sophisticated employees negotiate for representations and warranties about 409A compliance in the grant agreement, or at least confirm the company obtained a professional valuation.
What Happens When You Leave
Your grant agreement controls the exit, and the terms turn on why you left.
Unvested units are forfeited in virtually every plan, regardless of the reason for termination. Resignation, layoff, firing before vesting: those units are gone, and the company owes you nothing for the appreciation you helped build.
Vested units depend on the plan’s settlement triggers. If the plan pays on separation from service, your vested units can be settled shortly after you leave. If the plan only triggers on a change-of-control event, your vested units sit until that event occurs, which could be years later. Some plans let vested units survive indefinitely; others impose an expiration window.
Termination for cause is the harshest scenario. Many plans forfeit all units on a for-cause termination, vested included. Some go further with clawback provisions that let the company recover gains you already received. These provisions are enforceable in most circumstances, so the definition of “cause” in your grant agreement deserves careful reading.
Golden Parachute Exposure in a Sale
When a change of control triggers your EAU settlement, Sections 280G and 4999 of the Internal Revenue Code can create an extra tax hit for certain recipients.
These rules apply only to “disqualified individuals,” a group that includes officers, shareholders owning more than 1% of the company’s stock by value, and highly compensated individuals.4eCFR. 26 CFR 1.280G-1 – Golden Parachute Payments If you fall into one of those categories and your total change-of-control-related payments (EAU settlement, severance, accelerated vesting, other comp) equal or exceed three times your average W-2 compensation over the prior five years, two things follow.
The company loses its deduction for the “excess” parachute payment (the amount above one times your base amount), and you owe a 20% excise tax on that excess on top of regular income tax.5Internal Revenue Service. Golden Parachute Payments Audit Technique Guide The combined marginal rate on excess parachute payments can approach 60% or more once you add federal income tax, the 20% excise tax, and state taxes.
Some plans address this with a “cutback” that trims total payments to just under the three-times threshold so the excise tax never applies. Others include a “gross-up” where the company pays the excise tax on your behalf, though gross-ups have become uncommon. If you’re a senior employee or significant holder, raise this before a deal closes.