Three things decide what a severance package is worth, and the number in the letter is only the first of them. The second is which withholding method payroll uses. The third is your state’s unemployment rules, and for a lot of people that one moves more money than the other two put together.
It is wages, and it is withheld like a bonus
The first surprise is usually Social Security and Medicare. People assume that because they no longer work there, payroll taxes do not apply. They do. IRS Publication 15 states plainly that severance payments are wages subject to Social Security and Medicare taxes, federal income tax withholding, and federal unemployment tax.
Federal income tax on it is withheld the way a bonus is: either at a flat 22% on the payment alone, or by adding it to a regular check and withholding as though you earned that much every period. Your employer picks. Why a bonus gets taxed at 40% works through both methods, and everything there applies here unchanged.
What is different about severance is the size. A bonus is rarely six months of salary; a severance package often is, and the aggregate method annualizes from whatever lands in that period. So severance, more than any other supplemental payment, is where people see 40%.
| Package | Gross | Flat 22% method | Aggregate method |
|---|---|---|---|
| 4 weeks | $6,154 | $4,329 (29.65%) | $4,170 (32.23%) |
| 8 weeks | $12,308 | $8,659 (29.65%) | $7,737 (37.14%) |
| 13 weeks | $20,000 | $14,070 (29.65%) | $12,148 (39.26%) |
| 26 weeks | $40,000 | $28,140 (29.65%) | $23,262 (41.85%) |
On six months of pay the two methods are $4,878 apart, and you do not get a vote. As with a bonus, none of this is the tax. It is withholding, trued up on your return, and if too much came out it comes back. Run your own figures through the bonus tax calculator, which models both methods with your state applied.
Unemployment is where the real money moves
This is the part almost nobody checks before signing, and the rules are not remotely consistent between states.
| State | Does severance affect unemployment? | The rule |
|---|---|---|
| California | No | Severance and dismissal pay are not wages for unemployment purposes, and benefits cannot be denied because you received them. You collect both. |
| New York | Only sometimes, and the date decides | It counts against you only if the first payment arrives within 30 days of your last day of work and the weekly equivalent is more than the maximum benefit rate. Past day 30 it does not count at all. |
| Texas | Yes, benefits are suspended | You cannot receive benefits while you are receiving severance, and it must be reported when you apply. Wages paid instead of advance notice work the same way. |
In a state like New York, the start date can be worth more than the amount. A first payment landing on day 25 can cost you an entire unemployment claim. The same money starting on day 31 does not count against you at all. That is a single line in the agreement, it costs your employer nothing to move, and it is the cheapest thing in the whole negotiation to ask for. Nobody volunteers it, because the person drafting the letter is not thinking about your unemployment claim.
Lump sum or salary continuation
If you are offered a choice, these are the four things it changes.
- Withholding. A lump sum is unambiguously a supplemental payment. Salary continuation paid through the normal payroll is often withheld as ordinary wages instead, which for most people is lighter than either supplemental method.
- Health coverage. Continuation frequently keeps you on the employer plan while it runs. A lump sum usually ends coverage at your last day and starts the COBRA clock immediately, which can be worth more per month than the withholding difference.
- Which tax year it lands in. A lump sum in December stacks on top of a full year of salary. The same money in January lands in a year you may earn far less, at a much lower marginal rate. This is frequently the biggest single lever available and it is usually a question of days.
- Unemployment. Continuation running for thirteen weeks looks like thirteen weeks of payments to a state that suspends benefits while severance is being paid. How a lump sum gets allocated across weeks is the state agency’s call, not your employer’s.
What else is on the final check
Severance rarely arrives alone, and the other lines are not taxed the same way, which is most of why a final pay stub is so hard to read.
- Your prorated salary for the part period you worked is ordinary wages, withheld normally. The prorated salary calculator works out what that part is.
- A PTO payout is supplemental, like the severance, and whether you are owed one at all depends on your state. How much of a PTO payout you keep covers that.
- Stacked on one check under the aggregate method, all of it annualizes together, which is how a final paycheck reaches a withholding rate nothing in your actual tax year justifies.
One thing worth asking rather than assuming: many retirement plans do not let you defer severance into a 401(k), so the usual advice about sheltering a large payment may simply not be available. Ask your plan administrator before you count on it.
Frequently asked
Under the flat method, about 70 percent before state tax: 22 percent federal plus 7.65 percent for Social Security and Medicare. Under the aggregate method it depends on the size of the package, and a six-month package on an $80,000 salary can be withheld at nearly 42 percent. Either way it is withholding, not tax, and the excess comes back on your return.
Yes. IRS Publication 15 states that severance payments are wages subject to Social Security and Medicare taxes, federal income tax withholding and federal unemployment tax. Leaving the job does not exempt the payment.
It depends entirely on your state. California does not count severance as wages for unemployment, so you collect both. Texas suspends benefits while severance is being paid. New York counts it only if the first payment arrives within 30 days of your last day and the weekly equivalent exceeds the maximum benefit rate.
Continuation is often withheld more lightly and often keeps you on the health plan, while a lump sum gives you the money up front. The bigger question is usually which tax year it lands in, because a payment that slips into January can sit in a year you earn far less.
Your employer used the aggregate method, which adds the payment to a regular paycheck and withholds as though you earned that much every period. On a large package that annualizes into an enormous notional salary. It is a withholding rate, not your tax rate, and the difference is settled on your return.
No federal law requires severance pay. It comes from an employer policy, an employment agreement or a negotiated exit, which is also why the terms, including when the first payment lands, are more often negotiable than people assume.