What is Section 409A (deferred compensation)? Definition, how it works and examples
The tax code section behind every deferred-pay plan and every option strike — what counts as deferred compensation, the timing rules, and what a failure costs.
The short answer
Section 409A is the part of the US Internal Revenue Code that governs nonqualified deferred compensation — pay you earn in one year and receive in a later one — and every 409A plan must fix, in writing and in advance, when that pay can be paid. Get it wrong and the employee owes tax at once, plus 20%. For anyone working at a private company it is closer than it sounds.
What is 409A deferred compensation?
The 409A definition is wide on purpose. A plan defers compensation when you have a legally binding right in one year to pay that is, or may be, paid in a later year. “Plan” means any agreement or arrangement, including one that covers a single person — an offer letter or a severance letter is a plan if it promises pay later. The rule was added by the American Jobs Creation Act of 2004 and applies to amounts deferred after 31 December 2004.
What are the 409A deferred compensation rules?
Every rule in Section 409A answers one of three questions: when you may choose to defer, when the money may be paid, and when it may not be paid early. A 409A compliant plan answers all three in writing before the pay is earned, and then follows its own text. When you elect An election to defer pay for services in a year must be made by the end of the year before. A newly eligible participant gets 30 days, for services after the election. Performance-based pay measured over at least 12 months may be deferred up to six months before the period ends.
What falls outside Section 409A?
Most equity and cash pay at a private company is designed to fall outside the rules altogether. Each exception has conditions, and a payment that misses one is back inside. Short-term deferral Pay received by the 15th day of the third month after the year it vests is not deferred. The short-term deferral exception covers most bonuses and RSUs. Options and SARs at fair market value An option whose strike can never be below the stock’s fair market value on the grant date, on a fixed number of shares, is outside 409A. That is what a 409A valuation is for.
How Section 409A reaches a pre-IPO employee
The first contact is usually the option grant. A private company has no market price, so it sets the strike from an independent appraisal of its common stock. If the strike turns out to be below fair market value, the option is a discounted option and becomes deferred compensation with no fixed payment date — a plan failure that exercising quickly does not rescue; the regulation’s own example says so. How strikes are set is on the 409A valuation page. The second is equity that settles later.
Section 409A example: five awards held by one employee
A senior engineer at a private company holds five pieces of pay. The common stock was appraised at $10 a share on each grant date. The question for each is whether it is inside Section 409A and, if so, whether it complies. The discounted grant is the expensive one. The employee did nothing wrong, but the cost of the failure — income inclusion as the options vest, the 20% additional tax and interest — is theirs. What that costs in dollars is worked through on 409A penalties.
What does 409A compliance require, and who checks it?
There is no 409A form to file and no application or advance approval. Compliance is checked after the fact. In a 409A audit, IRS examiners follow the Nonqualified Deferred Compensation Audit Technique Guide (Publication 5528, revised March 2024), which reviews the plan document and the way it was operated separately. Failed amounts are reported on the employee’s Form W-2 in box 12 with code Z and in box 1, and the additional tax goes on the employee’s Form 1040.
Common mistakes with Section 409A
Thinking only executives are covered Any employee, contractor or director with a promise of later pay can be. A one-page letter is enough to be a plan. Granting on a stale valuation An appraisal older than 12 months, or one that predates a new round, can leave a grant priced below fair market value. Leaving payment dates open “Paid when the board decides” is not a permitted event. Discretion over timing is itself a failure. Paying early as a favour Settling a deferred bonus ahead of schedule is an acceleration — the generous act is the violation.
The terms this page uses
Nonqualified deferred compensation Pay earned under a legally binding right in one year and payable in a later one, outside a qualified plan such as a 401(k). Legally binding right A right the employer cannot reduce or cancel at will once the services are performed. Without one, nothing has been deferred. Substantial risk of forfeiture A condition — continued service, or a goal such as completing an IPO — that you can fail and lose the pay. Its lapse is what “vesting” means under 409A.
What people ask about Section 409A
What is a 409A plan? Any plan, agreement or arrangement that gives someone a binding right to pay in a later year, outside a qualified retirement plan. It does not need the word “plan” in it: an offer letter, a bonus letter or a severance agreement can each be one. What is 409A income? Usually it means deferred pay that has become taxable because a plan failed Section 409A. It is reported on Form W-2 in box 12 with code Z and in box 1, and the employee owes the 20% additional tax and interest on it. Is a 401(k) subject to 409A? No.
What is a 409A plan?
Any plan, agreement or arrangement that gives someone a binding right to pay in a later year, outside a qualified retirement plan. It does not need the word “plan” in it: an offer letter, a bonus letter or a severance agreement can each be one.
What is 409A income?
Usually it means deferred pay that has become taxable because a plan failed Section 409A. It is reported on Form W-2 in box 12 with code Z and in box 1, and the employee owes the 20% additional tax and interest on it.
Is a 401(k) subject to 409A?
No. A 401(k), a 403(b) and a governmental 457(b) are qualified employer plans and are excluded by the statute. Section 409A governs the nonqualified plans that sit beside them.
Does Section 409A apply to stock options?
Only if the strike can be below fair market value on the grant date, or the option has another deferral feature. An option granted at fair market value on a fixed number of shares is outside it; incentive stock options are outside it too.
Who pays if a plan fails 409A?
The employee. The statute puts the income inclusion, the 20% additional tax and the interest on the person whose pay was deferred. The employer’s exposure is mainly reporting and withholding, and the cost of fixing the plan.
Can a 409A failure be corrected?
Often, if it is caught early. IRS correction programmes cover many operational and document failures, with lighter consequences the sooner the fix is made — see the page on 409A penalties.
Where every rule on this page comes from
Every rule and figure was checked against the statute, the Treasury regulations and IRS publications on 2 October 2026. The §401(a)(17) limit behind the severance cap is indexed and changes every year. The example is illustrative, not market data.