409A vs 409B: Key Differences Every Startup Founder Must Know

The Short Answer: Only 409A Is Law

When founders and startup employees search for "409A vs 409B," they are often trying to understand whether their equity compensation arrangements are subject to one rule, the other, or both. The answer is straightforward: only Section 409A is enacted law. Section 409B was a proposed legislative extension that was discussed but never passed by Congress. It has no legal force.

For all practical purposes, there is no "409B" that affects your startup's equity compensation. Every conversation about startup stock options, strike prices, and IRS compliance is a conversation about Section 409A exclusively.

What Is Section 409A?

Section 409A of the Internal Revenue Code was enacted as part of the American Jobs Creation Act of 2004 and became effective in 2005. It establishes comprehensive rules for nonqualified deferred compensation — including stock options granted to employees, directors, and certain contractors of private companies.

The core requirement under 409A is that stock options must be granted with a strike price at or above the fair market value (FMV) of the underlying stock on the grant date. For private companies, FMV must be determined by an independent qualified appraiser — the 409A valuation. Options granted below FMV trigger immediate income tax on the spread at vesting, plus a 20% federal excise tax.

What Was Proposed Section 409B?

Section 409B was proposed in the context of legislative efforts to close perceived tax loopholes for independent contractors — specifically, high-earning service providers who structured compensation as deferred payments to defer income taxes. The proposal would have applied rules similar to 409A's timing and payment restrictions to nonqualified deferred compensation arrangements with independent contractors.

Key points about proposed Section 409B:

• It was never passed — it appeared in committee discussions and draft legislation but was not enacted
• It would have targeted large deferred compensation arrangements with independent contractors (primarily high-paid consultants and service providers), not startup employees
• It had nothing to do with stock option pricing or fair market value appraisals
• Even if it had been enacted, it would not have replaced or modified 409A — the two would have operated separately

Why Does the Confusion Exist?

Several sources of confusion persist:

• Numerical proximity: 409A and 409B sound like they are part of the same regulatory framework, encouraging the assumption that both apply
• Contractor coverage gap: 409A does apply to some contractor arrangements. The question of how it applies to non-employee service providers is genuinely complex, and some advisers incorrectly invoke "409B" when discussing it
• Outdated content: Some older legal and finance articles from the mid-2000s discussed 409B as a pending proposal, and this content continues to circulate

Section 409A and Independent Contractors

While Section 409B never became law, Section 409A does apply to certain deferred compensation arrangements with independent contractors. Specifically:

• Stock options granted to contractors must still be priced at FMV to avoid 409A penalties — the same rule that applies to employees
• Deferred payment arrangements with contractors (e.g., bonuses payable after service) may be subject to 409A's six permissible payment triggers
• Contractors who are also significant equity holders or "related parties" may face additional 409A complexity

If you are structuring equity compensation for contractors and advisors, the governing rule is 409A — not any proposed 409B. Ensure your 409A valuation covers all equity instruments granted to service providers, regardless of their employment classification.

What About International Contexts?

Section 409A is a US federal tax rule. It applies to US companies granting equity to US taxpayers, regardless of where the company operates. For international considerations:

• UK: The UK equivalent for employee share schemes is governed by the Employment Related Securities (ERS) rules and HMRC guidance — not 409A
• India: ESOP taxation in India is governed by the Income Tax Act 1961. Indian employees of US companies may have dual reporting obligations under both US 409A and Indian tax law
• Singapore: Employee share options are taxed under the Employment Act and Income Tax Act, with specific treatment under the Equity Remuneration Incentive Scheme (ERIS)
• UAE/Oman: No direct equivalent to 409A. US companies with UAE or Oman-based employees should consult local counsel on the interaction between US 409A obligations and local labour and tax law
• Canada: Employee stock options are governed by the Income Tax Act (Canada), with specific rules under Section 7. US companies with Canadian employees must navigate both regimes

Summary: Focus on 409A