Severance pay in California is taxed as ordinary wages by both the IRS and the state, and the combined withholding on a lump sum can easily exceed 30% of the gross before the check reaches you. The federal government treats it identically to regular pay, California adds its own income tax, and a 1.3% State Disability Insurance deduction applies to every dollar with no wage cap. The exact bite depends on your bracket and on whether the money arrives in one payment or spread over several.
Federal Tax Treatment
The IRS classifies severance as income you must report, subject to the same withholding and payroll taxes as your regular paycheck.1Internal Revenue Service. Publication 525 (2025), Taxable and Nontaxable Income Your employer withholds federal income tax based on the W-4 on file, and the full amount is subject to FICA.
Social Security tax is 6.2% on earnings up to the 2026 wage base of $184,500.2Social Security Administration. Social Security Tax Limits on Your Earnings If your regular wages during the year already crossed that cap, the Social Security portion won’t apply to the severance. Medicare tax is 1.45% on all wages with no cap, plus an additional 0.9% on individual earnings above $200,000.3Social Security Administration. Social Security and Medicare Tax Rates
A large payout can push your total income into a higher bracket. For 2026, the 24% bracket starts at $105,700 for single filers and $211,400 for joint filers, the 32% bracket begins at $201,775 for single filers, and the top 37% rate applies above $640,600.4Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026 Only income within each bracket is taxed at that bracket’s rate, so the effect is gradual. But a six-figure severance stacked on a year of salary can meaningfully raise your effective rate.
California State Income Tax and SDI
California treats severance as wages, which triggers state income tax withholding calculated from your Form DE 4, the state counterpart to the federal W-4.5Employment Development Department. Contribution Rates, Withholding Schedules, and Meals and Lodging Values California’s top marginal rate is 13.3% on taxable income above $1 million, which includes a 1% mental health services surcharge. Rates climb steeply through the middle brackets, so a sizable payout carries a real state income tax cost even below that top tier.
State Disability Insurance applies on top of income tax. The SDI rate for 2026 is 1.3%, and since January 1, 2024, there is no wage cap. Every dollar of severance is subject to SDI withholding.5Employment Development Department. Contribution Rates, Withholding Schedules, and Meals and Lodging Values Senate Bill 951 removed the prior cap, so high earners now pay SDI on their entire severance rather than just the first $153,164 as under the pre-2024 rules.
State Unemployment Insurance also applies but is primarily an employer-paid tax and does not directly reduce your check.
Lump Sum Versus Installment Withholding
How the payment is structured drives the withholding math. Severance spread across your regular pay periods is generally withheld using the same payroll method as your normal paychecks, applying your W-4 and DE 4 allowances. That usually produces withholding close to your actual liability.
A lump sum is different. The IRS treats it as a supplemental wage, and employers typically apply flat withholding rates rather than running it through the standard tables.
Federal Supplemental Rate
For severance under $1 million in a calendar year, your employer can either withhold a flat 22% for federal income tax or combine the severance with regular wages for that pay period and use the standard tables. Most employers pick 22% because it’s simpler. Once cumulative supplemental wages during the year exceed $1 million, the portion above that threshold is withheld at a mandatory 37%, regardless of your W-4.6Internal Revenue Service. Publication 15 (2026), Employer’s Tax Guide – Section 7
The 22% rate is blunt. If your actual marginal rate is 12%, the withholding overshoots and you’ll get the difference back at filing. If your marginal rate is 32% or higher, the withholding falls short and you’ll owe. Either way, the withholding shifts the timing of when you settle with the IRS; it isn’t the final tax.
California Supplemental Rate
California requires flat 6.6% state income tax withholding on severance treated as supplemental wages.7Employment Development Department. DE 44 – California Employer’s Guide Bonuses and stock options face a higher 10.23% California supplemental rate, but severance sits in the 6.6% category.
Add it up. A lump sum under $1 million faces at least 28.6% in combined federal and state income tax withholding before payroll taxes. Layer on 6.2% Social Security (if you haven’t hit the $184,500 wage base), 1.45% Medicare, and 1.3% SDI, and total withholding can approach 38% of the gross. Your actual tax may end up higher or lower depending on your bracket.
Parts of a Package That May Not Be Taxed
Not everything in a severance package is taxable, and the difference is worth understanding before you sign.
Employer-Paid COBRA Premiums
If your agreement has the employer paying (or reimbursing) COBRA premiums, that benefit is generally excluded from taxable income. The IRS treats employer-paid COBRA continuation coverage as an accident and health benefit, exempt from income tax withholding, Social Security, Medicare, and FUTA.8Internal Revenue Service. Employer’s Tax Guide to Fringe Benefits The exclusion applies whether the employer pays the carrier directly or reimburses you. When negotiating, asking for continued health coverage instead of an equivalent cash stipend can save a meaningful amount in taxes.
Payments Allocated to Physical Injuries
If part of the payout compensates you for personal physical injuries or physical sickness, that portion can be excluded from gross income under IRC Section 104(a)(2).9Internal Revenue Service. Tax Implications of Settlements and Judgments The IRS looks at what the payment was intended to replace. Compensation for emotional distress alone, discrimination, defamation, or lost wages unrelated to a physical injury does not qualify. Punitive damages are never excludable. When a separation involves any legal claim, how the settlement allocates the payment across categories directly changes how much is taxable.
Severance and California Unemployment
Severance does not reduce or delay your California unemployment benefits. The Employment Development Department does not treat severance as wages for unemployment insurance purposes.10EDD – CA.gov. Total and Partial Unemployment TPU 460.35 – Severance Pay, Dismissal or Separation Pay The rule traces to Powell and Byrd v. California Unemployment Insurance Appeals Board (1965), which held that severance and dismissal payments are not wages under Section 1265 of the Unemployment Insurance Code.
You still have to disclose the payment when you certify for benefits, since the EDD requires you to report all income on your continued claim form. But the reported severance should not cause a dollar-for-dollar reduction the way ongoing part-time wages would. You can file for unemployment right after your last day, even while severance is still being paid.
Ways to Reduce What You Owe
You can’t sidestep tax on severance, but structure and timing shift the outcome.
Split the Payment Across Two Calendar Years
If your employer is willing, spreading the payment across two years can keep you in a lower bracket in each. A $100,000 lump sum on top of a full year of salary concentrates income; splitting it so half arrives in December and half in January distributes it across two returns. This requires agreement before the separation agreement is signed.
Fund a Traditional IRA
Severance counts as earned income for IRA purposes, so a deductible contribution to a traditional IRA can lower taxable income. For 2026, the IRA contribution limit is $7,500, with a $1,000 catch-up if you’re 50 or older.11Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500 Whether the contribution is fully deductible depends on your income and whether you’re covered by an employer retirement plan during the year.
Know That a 401(k) Deferral Is Not an Option
A common misconception is that you can defer severance into a 401(k). You cannot. The IRS draws a line between pay for services rendered and pay triggered by termination; severance falls into the second category, which makes it ineligible for elective deferrals. Employers should not count severance when calculating matching or profit-sharing contributions either. Any room under the $24,500 annual 401(k) limit for 2026 would have had to be used through regular paycheck deferrals before your last day.11Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500
Push the Tax-Free Components
Employer-paid COBRA coverage is tax-free while an equivalent cash health stipend is fully taxable. Six months of direct COBRA premium payments can save hundreds or thousands compared to a taxable cash equivalent, depending on the premium. Outplacement services or career counseling provided by the employer are also generally not taxable to you.
Reporting Severance on Your Return
Your employer reports severance on Form W-2, like regular wages. The gross amount appears in Box 1 (federal wages) and Box 16 (California state wages). Federal income tax withheld appears in Box 2, Social Security wages and tax in Boxes 3 and 4, Medicare wages and tax in Boxes 5 and 6. California income tax withholding shows in Box 17 and SDI in Box 19.12Internal Revenue Service. General Instructions for Forms W-2 and W-3 (2026) You reconcile the federal figures on Form 1040 and the California figures on Form 540. If the flat withholding exceeded your actual liability, you’ll get a refund. If it was short, you’ll owe.
If you receive a Form 1099-NEC instead of a W-2, treat it as a warning. A 1099-NEC is for independent contractor pay, and it shifts the full 15.3% self-employment tax onto you.13Internal Revenue Service. About Form 1099-NEC, Nonemployee Compensation True severance from an employer-employee relationship belongs on a W-2. Push back if it lands on a 1099.
Avoiding an Underpayment Penalty
When flat-rate withholding undershoots your actual liability, estimated payments may be needed to head off a penalty. The IRS charges an underpayment penalty if you owe more than $1,000 at filing and your total withholding plus credits covered less than the smaller of 90% of current-year tax or 100% of prior-year tax (110% if prior-year AGI exceeded $150,000).14Internal Revenue Service. Estimated Tax
If a large severance lands midyear and withholding won’t be enough, you have two options. Make a quarterly estimated payment on Form 1040-ES for the quarter you received the money, or, if you start a new job, raise your W-4 withholding at the new employer to cover the shortfall. The second is often simpler because it avoids the quarterly system, and the IRS treats all withholding as paid evenly throughout the year regardless of when it was actually collected.