A 56-Year-Old Executive’s $480,000 Severance and the 401(k) Move That Saved Her $112,000 in Taxes

A 56-year-old vice president of marketing at a Fortune 500 company is laid off. The severance package: $480,000, structured as one year of base salary plus a prorated bonus and transition payment. HR offers a single check in December 2026. Her year-to-date W-2 income is already $300,000, and her 401(k) with this employer sits at $1.6 million.

If she accepts the default terms, she will owe the IRS roughly $190,000 in combined federal and Illinois state tax on the severance alone. A few phone calls and a 401(k) election form can cut that bill by about $112,000 across the next three tax years. Here is the math she ran before signing anything.

Why the Default Severance Check Is a Tax Disaster

Stacking the $480,000 lump sum on top of $300,000 in W-2 wages produces $780,000 of 2026 ordinary income. The single-filer brackets under the One Big Beautiful Bill push the top slice into territory most W-2 earners never see: 35% kicks in at $256,225, and 37% kicks in at $640,600.

Roughly $139,000 of her severance gets taxed at the top federal rate, and a much larger chunk at 35%. Add Illinois at 4.95% and the marginal tax on each severance dollar approaches 42 cents. A lump sum maximizes damage by compressing every dollar into the single highest-rate year of her career.

Move One: Negotiate the Payment Across Two Tax Years

Most employers will accommodate a split at no cost. Taking $240,000 in December 2026 and $240,000 in January 2027 changes the arithmetic dramatically. The 2026 total drops to roughly $540,000, sliding the top dollars out of the 37% bracket entirely and trimming exposure to the 35% bracket. The 2027 half lands in a year with no W-2 income, so most is taxed at 22% to 24%.

That single negotiation saves about $32,000 across the two years. The conversation belongs in the exit interview, before she signs the separation agreement.

Move Two: Max the 2026 401(k) Limit Before the Severance Hits

Her final paychecks can still carry deferrals. The 2026 employee limit is $24,500, plus an $8,000 catch-up for workers 50 and older, for a total of $32,500. At her marginal rate, every pre-tax dollar deferred is worth about 35 cents in federal tax, so maxing the plan in her final weeks saves roughly $11,400. If her plan allows after-tax contributions, the mega backdoor Roth is worth a same-day call to the plan administrator.

Move Three: Treat 2027 as a Roth Conversion Window

With only $240,000 of severance hitting in 2027 and no salary behind it, her taxable income drops into the 22% to 24% bracket range after the $16,100 standard deduction (indexed slightly higher for 2027). That is the cheapest tax environment she will see between now and required minimum distributions at 75.

Converting $80,000 to $110,000 of traditional 401(k) money to a Roth IRA in 2027 fills the 24% bracket without spilling into 32%. The same dollars left alone would eventually come out at 32% or higher once Social Security and RMDs stack up.

The Rule of 55 Trap That Could Cost Her Six Figures

Because she separated from service in the year she turns 55 or later, IRC §72(t)(2)(A)(v), the Rule of 55 lets her pull from this specific 401(k) without the 10% early withdrawal penalty until age 59½. The catch: the exemption applies only while the money stays in the former employer’s plan. Rolling the $1.6 million to an IRA destroys it.

If she needs $60,000 a year to bridge to 59½, leaving the balance in the plan preserves roughly $18,000 in penalties she would otherwise owe on an IRA distribution.

What to Do This Week

1. Before signing the separation agreement, request severance as $240,000 in December 2026 and $240,000 in January 2027, and get the timing in writing.
2. Call the 401(k) recordkeeper today to redirect remaining 2026 paychecks to the full $32,500 contribution limit, and ask whether the plan permits after-tax contributions and in-plan Roth conversions.
3. Leave the $1.6 million in the former employer’s 401(k) until age 59½ to preserve Rule of 55 access, and pencil in an $80,000 to $110,000 Roth conversion for 2027 while taxable income sits in the 24% bracket.