Severance pay tax bracket choices at Kestrel Bay Retirement Advisors

Severance on top of ten months of pay: two small mistakes worth $5,750

Accepting a December lump sum after ten months of salary and selling ESPP shares that same fall are two separate small errors. In the hypothetical Rafael example, they add $4,800 of income tax and $950 of net investment income tax, or $5,750 together, compared with the January version of the identical layoff. The severance amount, share count, and gain do not change. Only the year changes.

Rafael is 55, divorced, an engineering manager at a hardware company, and has a daughter in college. He holds about $650,000 of ESPP stock with less than $150,000 of basis, so a sale is not merely a cash decision. Before Kestrel Bay Retirement Advisors suggests an ESPP sale during a layoff, we calculate the likely tax on the chosen lot under each available severance date.

For Rafael, the layoff year carries ten months of salary, $140,000 in wages. The following year may show only $85,000 of MAGI. Those are the highest-income year and the lowest-income year back to back, and the severance date decides which one absorbs the $40,000.

This is a timing problem, not a trick. An employer may refuse to change the date, and Section 409A rules can limit changes after deferred-compensation terms are set. Still, asking before the release is signed costs little, while signing first can lock in the December payment and force the stock-sale decision into the same crowded year.

How much of a severance check goes to tax, and in which year?

Severance counts as supplemental wages in the year it is paid, adding to Box 1 of your Form W-2 with regular salary, RSU vests released before the layoff, and any ESPP ordinary income. Federal income tax, Social Security tax, and Medicare tax can apply. The employer’s withholding may use a flat supplemental-wage method, which can be well below your actual marginal rate once the check lands on top of salary.

Check the current IRS supplemental withholding rate, then compare the amount withheld with your projected total tax. A modest withholding line on the severance statement is not proof that the final tax is modest. Kestrel Bay Retirement Advisors looks at the full-year income picture before treating a withholding amount as spendable cash.

Three thresholds deserve attention. The 3.8% net investment income tax applies to the lesser of net investment income or MAGI above $200,000 for a single filer and $250,000 for married filing jointly. The 2026 SSA taxable wage base is $184,500. Ordinary income can also move into the next federal bracket, so we check the current IRS brackets each year before quoting a rate.

The wage-base detail can reverse part of the expected gain. If this year’s wages already exceed $184,500, severance paid this year may escape the 6.2% Social Security tax; a January payment can restart that tax until next year’s wage base is reached. Put that extra payroll tax beside the income-tax saving before choosing a date.

Why withholding is not the final bill

Three thresholds worth checking

Seven steps from the release deadline to your return

A layoff sequence works best when you settle the payment date before you choose investments to sell. The first document to read is the separation agreement, not the brokerage screen. Under federal age-discrimination rules, workers age 40 and older generally get at least 21 days to consider an individual release, or 45 days in a group layoff. Once they have signed, they still have seven days to withdraw consent.

Keep copies of the last pay stub, the release, the ESPP lot report, and the final W-2. Form 8949 will later require the right basis and sale details for stock transactions. A calculator on this site can help you model the simple payment-year and stock-sale arithmetic, but your return may contain plan-specific details that need review.

• 1. Read the release deadline and identify the proposed payment date.
• 2. Pull the final pay stub. Add year-to-date wages, RSU vests, and ESPP purchases or compensation income.
• 3. Ask HR in writing, before signing, whether payment can occur in January or as salary continuation.
• 4. Ask whether the final regular paycheck permits 401(k) deferrals. The IRS 2026 employee limit is $24,500, plus an $8,000 catch-up at age 50 or older. When prior-year FICA wages exceeded $150,000, that catch-up must be Roth. Severance after separation usually cannot go into the plan.
• 5. Compare withholding with the projected bill. If it is short, an estimated fourth-quarter payment is generally due in mid-January.
• 6. Pick the ESPP sale year only after the severance year is known. Tax-loss harvesting may matter if you have realized losses, but it does not erase ordinary wage income.
• 7. Leave the old employer’s 401(k) alone until you decide whether the Rule of 55 matters. Rolling it into an IRA can end penalty-free access before age 59½.

Rafael at 55: one check, two possible years

Rafael, hypothetical, is laid off at the end of October after earning $140,000 in wages. He can receive $40,000 of severance in December or the next January. He also plans to sell $60,000 of ESPP shares with $15,000 of basis, producing a $45,000 long-term gain. The illustration assumes a 24% marginal rate this year and 12% next year; check current IRS brackets for your own return.

With the December check, $40,000 × 24% equals $9,600 of income tax attributable to the severance. With a January check, $40,000 × 12% equals $4,800. The payment-date difference is $4,800. His $140,000 wages plus $40,000 severance equal $180,000, still below the 2026 $184,500 Social Security wage base, so shifting this particular check adds no Social Security tax.

Selling the shares this year brings Rafael’s MAGI to $225,000. The amount above the $200,000 single-filer NIIT threshold is $25,000, and $25,000 × 3.8% equals $950. In the lower-income January year, projected MAGI is $85,000 and no NIIT applies. The combined difference is $4,800 plus $950, or $5,750.

If Rafael invests $5,750 and earns 5% a year for illustration only, $5,750 × 1.629 equals about $9,400 after ten years. Investments can decline in value, and he could receive less than he invested. But at 55, this is still money that can compound during years when retirement contributions and portfolio withdrawals begin to overlap.

The payroll-tax check

Why $5,750 still matters at 55

From 55 to 65: the years that set the bill

The gap between age 56 and age 62 is often the useful window in this plan because stock sales during that stretch do not yet feed into Medicare premiums. The timeline assumes Rafael’s severance arrives in January and that he has no immediate replacement job. His actual spending need, market value, and employer-plan rules could change the sequence.

The Rule of 55 can let Rafael withdraw from this employer’s 401(k) without the 10% early-withdrawal penalty because he left in the year he turned 55. It does not apply to an IRA or necessarily to an older employer plan. That account can supply cash while he sells ESPP stock in measured amounts, a subject covered more deeply in our article on how much company stock is too much.

At age 63, the Medicare lookback becomes hard to ignore. Medicare IRMAA sets each year's premium from the MAGI on the return filed two years before, so income at 63 affects premiums at 65. For 2026, the standard Part B premium is $202.90 a month up to $109,000 of MAGI for a single filer; the next tier is $284.10. We map likely stock sales before Rafael turns 63, because a rushed sale that year can show up in his monthly Part B bill at 65.

The Rule of 55 is account-specific

Age 63 creates a new planning deadline

How much does filing status or balance change the plan?

A January payment is not automatically a low-bracket payment. For married filers, a spouse’s wages stay on the same return, so both incomes need to be added before asking HR to move the date. A new role that begins in January can also erase most of the benefit, because the severance then stacks on a fresh salary.

A small severance beside a large stock position shifts the emphasis. The payment date still matters, but spreading stock sales over more than one year may matter more; a multi-year sale schedule belongs in the concentrated-stock planning conversation. For someone with less stock and a $25,000 severance, the payment year can be the main tax lever.

Late-career timing changes again. A person laid off at 60 or older has less time before the IRMAA lookback, while a new job at ages 60 through 63 can open an $11,250 catch-up in that employer’s plan under the IRS 2026 rules. Roth conversion planning may fit a truly low-income year, but paying conversion tax while severance and RSU income remain high usually deserves a pause.

Your daughter’s aid form and your heirs see this year too

A severance year reaches beyond your own federal return. FAFSA uses income from two years before the award year, so Rafael’s layoff-year wages, severance, and stock sales can appear on a later aid application for his college-age daughter. Moving a payment from December to January changes which aid year receives the income, even though it does not make the income disappear.

After a divorce, FAFSA generally looks to the parent providing more financial support. Confirm which parent’s return counts before deciding which year should carry an ESPP sale. Rafael may also need to budget for COBRA or a marketplace plan for an adult child under 26 before using a concentrated-stock sale as the automatic cash source.

Low-basis shares held until death generally receive a basis adjustment for heirs. That is a real reason to retain some ESPP stock, particularly if Rafael can cover spending from other assets. It competes with concentration risk and the advantage of reducing stock before the age-63 Medicare lookback begins. Kestrel Bay Retirement Advisors treats that as a judgment call, not a rule that every share must be sold.

How long should you wait before selling the stock?

Selling in October of the severance year can be too early because it stacks a gain on wages and may add NIIT. In Rafael’s illustration, the early sale adds $950. Waiting without a calendar can be too late: sales at 63 or 64 can increase Medicare premiums two years later, while sales after a new job begins stack on new wages.

Signing the release before raising the payment-date question and rolling a 401(k) to an IRA before using the Rule of 55 tend to arrive together. The first can lock severance into a high-income year; the second can make an accessible retirement account subject to the 10% early-distribution penalty. Those errors reduce choices just when a layoff makes cash flow feel tight.

Use a rough screen. When severance is $25,000 or more and next year’s income appears less than half of this year’s, payment timing work is usually worth the effort. Below that level, the saving is often only a few hundred dollars. Yes, some readers should take the check, reserve enough for taxes, and move on.

This is general education, not tax advice for your own return. Many employers cannot alter the payment date, and an immediate new job or a spouse’s income may leave the household in the same bracket either way.

The two deadlines that close choices

What Kestrel Bay Retirement Advisors reads first in a layoff year

Kestrel Bay Retirement Advisors first reads the final pay stub for year-to-date wages and withholding, then the separation agreement for the payment date and release deadline, then the ESPP lot list for the basis of each lot. Those three documents show whether the January question and a delayed sale are worth pursuing.

We then estimate tax under both payment years and decide which shares, if any, should be sold first. We explain the fee when we first speak with you, and you receive it in writing before any work begins.