How to Calculate Severance Pay Taxes
Estimate federal withholding, Social Security, Medicare, Additional Medicare, state withholding, and your projected net severance pay using a premium calculator built around common U.S. payroll rules for supplemental wages.
Severance Tax Calculator
Enter your severance and payroll details to estimate withholding on a typical U.S. severance payment.
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Expert Guide: How to Calculate Severance Pay Taxes
Severance pay can feel straightforward at first glance: your employer promises a lump sum or salary continuation, and you want to know how much money will actually land in your bank account. The complication is that severance is usually taxed as wages in the United States. That means federal income tax withholding, Social Security tax, Medicare tax, possible Additional Medicare tax, and often state income tax withholding can all reduce the net amount you receive. If you are searching for how to calculate severance pay taxes, the right approach is to separate the calculation into a series of payroll steps rather than guessing based on your normal paycheck.
In most cases, severance pay is considered supplemental wages. The Internal Revenue Service allows employers to use specific withholding methods for supplemental wages, including severance. For many employees, the most visible rule is the flat federal withholding rate of 22% on supplemental wages under the applicable threshold. If total supplemental wages paid during the year exceed $1 million, the rate on the excess generally increases to 37%. That is only the federal withholding piece. FICA taxes often still apply, and that is where many people underestimate the tax impact of a severance check.
This guide explains the mechanics in plain English, shows the formulas, and gives you a practical checklist so you can estimate your net severance with much more confidence.
Is Severance Pay Taxable?
Yes. In the U.S., severance is generally taxable compensation. Employers typically process it through payroll, which means it can be subject to:
- Federal income tax withholding
- Social Security tax
- Medicare tax
- Additional Medicare tax, if your wages exceed the threshold
- State income tax withholding, depending on where you live and work
- Possibly local income taxes in certain jurisdictions
That said, withholding is not the same thing as your final tax liability. The amount withheld from severance is an estimate that goes toward your eventual tax bill when you file your return. In some cases, too much is withheld and you may receive a refund. In other cases, not enough is withheld and you may owe additional tax at filing.
Step-by-Step: How to Calculate Severance Pay Taxes
- Start with your gross severance. This is the full amount promised under the severance agreement before taxes and deductions.
- Subtract any eligible pre-tax deductions. If your employer permits certain pre-tax deductions through payroll, reduce the taxable amount by those deductions.
- Estimate federal withholding. For many severance payments treated as supplemental wages, employers use the 22% flat rate. If total supplemental wages for the year go above $1 million, the excess may be withheld at 37%.
- Calculate Social Security tax. Apply 6.2% only to wages up to the annual Social Security wage base. If you already exceeded the wage base before severance, your severance may not be subject to any additional Social Security tax.
- Calculate Medicare tax. Apply 1.45% to taxable severance wages with no wage cap.
- Check for Additional Medicare tax. Employers must withhold an extra 0.9% on wages above $200,000 paid to an employee during the year. Your final personal threshold on your tax return can vary by filing status, which matters for planning.
- Add state and local withholding. Rules differ widely. Some states use a flat supplemental withholding rate, while others follow regular withholding tables or have no state income tax.
- Subtract all withholding from taxable severance. The remainder is your estimated net severance.
The Core Formula
A practical estimate looks like this:
Net severance = Taxable severance – Federal withholding – Social Security tax – Medicare tax – Additional Medicare tax – State tax – Local tax
If your severance is paid as salary continuation over several pay periods rather than a single lump sum, your withholding may look different from a standalone lump-sum payment. Salary continuation often resembles your regular payroll withholding pattern, while a separate severance check commonly uses the supplemental wage rules.
Federal Withholding on Severance
Many employees are surprised because employers often withhold federal tax on severance at a flat 22% rather than your normal paycheck rate. This happens because severance is frequently treated as supplemental wages. The 22% rate can be lower or higher than your actual effective or marginal tax rate, so your final tax result depends on your total annual income.
If your supplemental wages for the year exceed $1 million, the withholding on the excess generally jumps to 37%. This affects highly compensated employees, executives, and some large buyout packages.
| Federal payroll item | Common rate | How it applies to severance | 2025 planning note |
|---|---|---|---|
| Supplemental federal withholding | 22% | Often used on severance and other supplemental wages below the annual high-income threshold | Good quick estimate for many employees receiving a separate severance payment |
| Supplemental wages above threshold | 37% | Applies to supplemental wages over $1,000,000 in the year | Important for executive compensation and large payouts |
| Social Security tax | 6.2% | Applies only until wages reach the annual wage base | 2025 wage base used in this calculator: $176,100 |
| Medicare tax | 1.45% | Applies to all taxable wages with no cap | Usually due on all severance wages |
| Additional Medicare tax | 0.9% | Applies to wages above threshold amounts | Single and HOH commonly use $200,000; MFJ uses $250,000; MFS uses $125,000 for planning |
How FICA Taxes Affect Severance
FICA refers to Social Security and Medicare taxes. These can significantly reduce a severance payment even when your federal income tax withholding seems manageable. Social Security tax is limited by the annual wage base, but Medicare has no wage cap. As a result, employees who already earned above the Social Security wage base may avoid the 6.2% Social Security portion on severance, while still paying Medicare.
Example 1: Employee Below the Wage Base
Suppose your severance is $25,000 and your year-to-date wages are $85,000 before severance. Using the common supplemental rate, your estimate might look like this:
- Federal withholding: $25,000 × 22% = $5,500
- Social Security: $25,000 × 6.2% = $1,550
- Medicare: $25,000 × 1.45% = $362.50
- State withholding at 5%: $1,250
- Estimated net: $25,000 – $5,500 – $1,550 – $362.50 – $1,250 = $16,337.50
Example 2: Employee Already Above the Social Security Wage Base
Now assume your year-to-date wages are already $190,000 before severance and the Social Security wage base is $176,100. In that situation, none of the severance would generally be subject to additional Social Security tax. On a $25,000 severance, you might still owe:
- Federal withholding at 22%
- Medicare at 1.45%
- Additional Medicare depending on your income level
- State tax if applicable
This is why year-to-date wages matter so much when you estimate severance taxes. Two employees receiving the same gross severance can have very different net results.
State Tax Differences Matter More Than Most People Expect
State treatment of severance varies. Some states have no income tax, while others use specific supplemental withholding rates. In practical planning, the state line can change your net severance by thousands of dollars. Even if you know the federal 22% rule, your state withholding can be the difference between a comfortable transition fund and a shortfall.
| State scenario | Typical withholding effect on a $25,000 severance | Estimated state withholding | Planning takeaway |
|---|---|---|---|
| No state income tax | No state wage withholding in states such as Texas, Florida, or Washington | $0 | Your net may be materially higher than in high-tax states |
| Moderate flat estimate | Using a 5% planning assumption | $1,250 | Reasonable placeholder if your state uses flat wage withholding |
| Higher flat estimate | Using a 9.3% planning assumption similar to higher-tax environments | $2,325 | State withholding can rival or exceed FICA for some earners |
Common Mistakes When Estimating Severance Taxes
- Confusing withholding with final tax. Just because 22% is withheld for federal tax does not mean your true tax rate on severance is exactly 22%.
- Ignoring Social Security wage base rules. Whether you already exceeded the wage base can dramatically change your estimate.
- Forgetting Medicare and Additional Medicare. These continue to matter even after Social Security caps out.
- Skipping state and local taxes. Federal rules are only one part of the picture.
- Not checking how the employer pays severance. A lump sum and salary continuation can produce different withholding outcomes.
- Assuming every deduction applies. Some benefits and pre-tax deferrals may not continue through severance payroll in the same way as regular wages.
How Employers Usually Withhold Severance
Employers commonly use one of two approaches for supplemental wages. First, they may issue severance as a separate payment and apply the flat supplemental withholding rate. Second, they may combine severance with regular wages in a payroll cycle and withhold as though the entire amount were regular wages for that period. The first method is easier for employees to estimate. The second can create a larger or more irregular withholding amount because payroll systems annualize wages.
If your severance agreement states that payments will continue over several payroll periods, review your first stub carefully. The practical withholding pattern may differ from the estimate in a lump-sum model.
Planning Tips Before You Sign a Severance Agreement
- Ask whether severance is paid in a lump sum or salary continuation. This affects withholding and cash flow timing.
- Confirm whether unused PTO is paid separately. Vacation payout may appear on a different payroll line.
- Check your year-to-date wages. This determines whether Social Security still applies.
- Estimate your annual tax bracket. Withholding might not match your eventual tax liability.
- Review state-specific rules. Your state may use a special supplemental withholding rate.
- Set aside extra cash if needed. A high-income year, bonus income, stock vesting, or other compensation could increase your final tax due.
Authoritative Sources You Should Review
If you want to verify the official rules or read the underlying payroll guidance directly, start with these authoritative sources:
- IRS Publication 15 (Employer’s Tax Guide)
- Social Security Administration contribution and benefit base data
- U.S. Department of Labor guidance on final pay and wages
Final Takeaway
If you want to understand how to calculate severance pay taxes, think of the process as a payroll withholding exercise. Start with gross severance, subtract any eligible pre-tax deductions, estimate federal withholding using the supplemental wage rules, calculate Social Security only up to the annual wage base, apply Medicare and any Additional Medicare tax, then add state and local withholding. Once you do that, the net amount becomes much easier to predict.
The calculator above is designed to make that process faster. It is especially useful if you want to compare scenarios, such as receiving severance before or after you cross the Social Security wage base, or estimating the impact of different state withholding rates. For a large severance package, executive payout, or situation involving stock compensation, consulting a CPA or tax attorney can be well worth the cost.