The 22% Supplemental Withholding Rule on Severance Decoded for 2026

The 22% Rate Is Not the Tax — It’s the Withholding

The federal flat 22% withholding rate on severance is one of the most commonly misunderstood numbers in US tax law. A laid-off employee sees 22% federal income tax withheld on their severance, divides $22,000 from a $100,000 package by the gross, and concludes that severance is taxed at 22%. The conclusion is wrong, and the consequences fall in two directions: high earners under-withhold and owe substantial federal tax at filing; lower earners over-withhold and receive refunds.

The 22% rate exists because the IRS classifies severance as “supplemental wages” under Publication 15-A — irregular wage payments that don’t fit neatly into the regular withholding tables. Bonuses, severance, commissions, overtime adjustments, accumulated leave payouts, and similar payments all fall under the supplemental category. Rather than requiring employers to recalculate each employee’s annual income picture for every one-off payment, the IRS permits a simplified flat rate.

This article walks through what the 22% rate actually is, when 37% applies instead, and the reconciliation math that determines what taxpayers actually owe at filing time.

The Supplemental Wage Definition

Under Publication 15-A, supplemental wages are wages other than regular wages, including:

• Bonuses
• Commissions
• Overtime pay (in some calculations)
• Accumulated sick or vacation leave payouts at separation
• Severance pay
• Awards and prizes
• Back pay
• Taxable fringe benefits

The supplemental classification has nothing to do with the dollar amount or the recipient’s income level — it’s about the nature of the payment. A $5,000 bonus and a $500,000 severance are both supplemental wages.

The 22% withholding rate is the standard flat rate for supplemental wages under $1 million paid to a single employee in a single calendar year. The rate is documented in Publication 15-A as the “optional flat rate method,” but in practice it’s the default for most large employers because of administrative simplicity.

The alternative is the “aggregate method,” which calculates withholding by adding the supplemental wage to the most recent regular wage payment and using the standard withholding tables. The aggregate method requires the employer to know the employee’s most recent regular wages, the pay period, the withholding allowances on file, and similar inputs — workable for small employers but cumbersome for large payroll systems. Most large US employers use the flat 22% rate for severance and bonuses by default.

When the 37% Rate Applies

The 22% rate caps out at $1 million in supplemental wages per employee per employer per calendar year. Amounts above $1 million in a single calendar year face a mandatory 37% withholding rate — this is not an option, it’s required by the supplemental withholding rules.

The threshold operates per-employer, so an executive moving between two firms in a single year could theoretically reset the $1 million count at each employer. In practice, the threshold mostly affects:

• Partner-level severance at law and consulting firms
• Senior executive separations at major public companies
• Investment-bank MD severance packages
• Combined-year payouts where annual bonus, separation bonus, and deferred-compensation acceleration land in the same calendar year

A typical white-collar severance ($30,000 to $200,000) is well under the threshold and faces only the 22% rate. A senior MD package combining $750,000 severance, $400,000 accelerated bonus, and $200,000 deferred-comp payout in the same year crosses the threshold mid-payment, triggering 37% withholding on the portion above $1 million.

The 37% rate is also the top federal marginal income tax bracket for 2026, which is intentional — the rule is designed to roughly match withholding to expected tax for very high earners receiving lump-sum payments.

What the Reconciliation Actually Looks Like

The 22% withholding rate is meaningful only as a cash-flow event during the year. The actual federal tax owed reconciles at filing time on Form 1040 against the year’s total income and the standard progressive brackets per IRS Publication 525.

The 2025 federal income tax brackets per IRS Publication 17 for single filers are (2026 brackets are inflation-adjusted upward by approximately 2-3%):

Bracket	Income range (single filer)
10%	$0 to $11,925
12%	$11,925 to $48,475
22%	$48,475 to $103,350
24%	$103,350 to $197,300
32%	$197,300 to $250,525
35%	$250,525 to $626,350
37%	above $626,350

The brackets for married-filing-jointly approximately double the thresholds, except for the top 37% bracket which kicks in at $751,600.

For a single filer with $80,000 annual wages plus $40,000 severance in 2026 — total $120,000 — the marginal rate on the top portion sits in the 24% bracket. The 22% supplemental withholding on the severance under-withholds by about 2% on the marginal portion, producing roughly $800 of additional federal tax owed at filing.

For a single filer with $400,000 annual wages plus $200,000 severance — total $600,000 — the marginal rate sits in the 35% bracket. The 22% supplemental withholding on the severance under-withholds by 13% on the marginal portion, producing roughly $26,000 of additional federal tax owed at filing. Without estimated-tax payments during the year, this can trigger underpayment penalties.

For a single filer with $35,000 annual wages plus $20,000 severance — total $55,000 — the marginal rate sits in the 22% bracket. The supplemental withholding matches the marginal rate, producing near-zero adjustment at filing.

The pattern: 22% withholding under-withholds for taxpayers above the 22% bracket and over-withholds for taxpayers below it. Severance recipients in the 24% or higher brackets — which covers most white-collar separations — typically owe additional federal tax at filing.

State Withholding Stacks On Top

The 22% federal supplemental rate is the federal layer only. State supplemental withholding rates stack on top in states with income tax, often at meaningful rates:

• California: 6.6% standard supplemental rate, 10.23% on stock options and bonuses above thresholds
• New York: 11.7% supplemental rate for high earners
• New York City (residents): 4.25% additional supplemental rate
• New Jersey: Graduated supplemental rates topping at 11.8%
• Massachusetts: 5% supplemental rate
• Illinois: 4.95% flat supplemental rate
• Texas, Florida, Washington, Nevada, South Dakota, Tennessee, Wyoming, Alaska: No state income tax, no state supplemental withholding

For a New York resident receiving $100,000 severance, the combined withholding stacks as 22% federal + 11.7% state + 4.25% NYC = 37.95% before FICA. For a Texas resident receiving the same $100,000, the combined withholding is just 22% federal plus FICA — see the Texas severance tax breakdown and the New York severance tax breakdown for the full state-specific math.

The state withholding follows the same reconciliation pattern as federal — it’s a withholding rate, not a final tax rate, and the actual state tax owed reconciles on the state return at filing time.

Estimated Tax Payments and Underpayment Penalties

The IRS requires taxpayers to pay tax throughout the year, not just at filing. For W-2 employees, regular wage withholding typically satisfies this requirement automatically. For severance recipients with supplemental withholding below their marginal rate, the under-withholding can produce both a balance due at filing AND an underpayment penalty.

The safe harbor under IRS Form 1040-ES is to either:

1. Pay at least 90% of the current year’s actual tax through withholding and estimated payments, OR
2. Pay at least 100% of the prior year’s actual tax (110% if prior year AGI exceeded $150,000)

A severance recipient who under-withheld substantially can avoid underpayment penalty by making a Q4 estimated tax payment to bring total payments above the safe harbor. The deadline for the Q4 estimated payment is January 15 of the following year.

For high earners separated mid-year, the math is worth checking. A $400,000-per-year executive separated in August with $200,000 severance withheld at 22% federal will typically need to make a Q4 estimated tax payment to avoid the underpayment penalty — even though the actual balance won’t be due until April 15.

What’s Worth Knowing Before Signing

For severance recipients facing the 22% federal supplemental withholding rate, three practical implications:

The withheld amount is not the tax owed. Mental accounting should compute the actual marginal rate against total expected annual income, not just look at the 22%. For most white-collar separations, additional federal tax is owed at filing, typically in the $5,000 to $30,000 range depending on the severance amount and bracket.

Payment timing can move income across calendar years. Late-year separations sometimes have flexibility to push payment into January of the following year. If the next year’s total income is materially lower (because of a year out of work or a lower-paying role), the federal tax savings can be substantial — sometimes worth $10,000+ on $100,000 of severance.

The $1 million threshold matters for senior executives. Combined severance, bonus, and deferred-comp payouts in a single calendar year can cross the threshold and trigger 37% withholding on the portion above $1 million. Structuring the payments across two calendar years sometimes avoids the threshold and preserves the 22% rate on all of it.

Tax law changes annually; this article reflects 2026 rates and is refreshed each January. Consider consulting a CPA or tax attorney for advice specific to your situation, particularly for high-dollar severance, multi-state allocations, or separations involving deferred compensation.