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Executives can redirect bonus income through two tax mechanisms: raising 401(k) deferral rates before bonus payment (allowing up to $24,500-$35,750 in total 2026 deferrals depending on age) to defer at 35-37% federal rates, or using Nonqualified Deferred Compensation (NQDC) plans with no contribution limits but requiring the deferral election by December 31 of the prior year. A $150,000 bonus deferred through NQDC at the 37% bracket avoids $55,500 in federal tax in the deferral year.
Executives approaching Medicare eligibility at 65 must account for IRMAA surcharges based on a two-year lookback, where a 2026 bonus spike increases 2028 Medicare Part B premiums by $81-$447+ monthly depending on income thresholds, making NQDC deferrals particularly valuable for controlling Modified Adjusted Gross Income.
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An executive earning a $200,000 base salary and a $150,000 year-end bonus faces a straightforward tax problem: that bonus lands on top of already-elevated income, pushing more of it into the 35% or 37% federal bracket. Most executives know this. Fewer know there are two separate mechanisms available to redirect that income before it becomes taxable, and one has a deadline that passed before the bonus was ever earned.
Most employer 401(k) plans allow mid-year changes to the deferral election percentage. The move is straightforward: before the bonus pay period, raise the deferral rate high enough to funnel as much of the bonus as possible into the 401(k), up to the annual limit. After the bonus clears, reset the rate to match ordinary salary contributions for the rest of the year.
For 2026, the IRS elective deferral limit is $24,500, and executives aged 50 to 59 and 64 or older can add a catch-up contribution of $8,000, bringing the total to $32,500. Executives between 60 and 63 qualify for the SECURE 2.0 super catch-up: $11,250 instead of $8,000, for a combined limit of $35,750.
Read: Data Shows One Habit Doubles American’s Savings And Boosts Retirement
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If an executive has contributed $10,000 through salary deferrals by December, the remaining $14,500 of standard room (or up to $25,750 with the super catch-up) can be directed at the bonus. Some plans go further, allowing a separate deferral election specifically for bonus income, which eliminates the need to time the rate change at all. Check the plan document or ask the plan administrator directly.
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Deferring $35,750 at a marginal rate of 35% keeps roughly $12,500 out of federal income tax for that year, while the money continues compounding inside the plan.
The 401(k) plan has a ceiling, and for executives with access to a Nonqualified Deferred Compensation (NQDC) plan, there is no contribution limit. A $150,000 bonus can be deferred entirely. But the election to defer it must be made in the year before the bonus is earned, under IRC Section 409A. An executive who wants to defer a bonus earned in 2027 must make that election by December 31, 2026.
Many executives miss this deadline or are unaware that it exists, and the 401(k) adjustment can occur days before a bonus is paid out, whereas the NQDC election cannot. The decision made this December governs next year’s income.
A $150,000 bonus deferred through an NQDC plan in the 37% bracket avoids $55,500 in federal income tax in the year of deferral. The money is taxable when distributed, but if distributions are timed for retirement years, when income is lower, the effective rate on that deferred income may be substantially lower.
For executives approaching 65, the bonus deferral decision intersects with Medicare costs through a two-year lookback mechanism. IRMAA surcharges for 2026 are based on 2024 income, a single filer whose modified adjusted gross income exceeded $109,000 in 2024 pays $284.10 per month for Medicare Part B in 2026 instead of the standard $202.90. That is an additional $81.20 per month, or roughly $974 per year, for crossing the first threshold. Higher income tiers reach $649.20 per month.
An executive who takes a large bonus without deferral in 2026 may find that 2028 Medicare premiums reflect that spike, even if income has since dropped. The NQDC deferral election made this December for 2027 income can prevent that outcome two years out.
Before the next bonus pay period, contact the plan administrator and ask whether the plan allows mid-year deferral rate changes and whether a separate bonus deferral election is available. If yes, calculate the remaining annual limit and set the rate accordingly.
If the employer offers an NQDC plan and the December 31 election deadline has not passed, determine how much of next year’s anticipated bonus to defer. The election is irrevocable once made, so the decision requires a realistic estimate of retirement income and expected tax rates at the time of distribution.
If the combined income in the year of the bonus will exceed $109,000 (single) or $218,000 (married filing jointly), model the IRMAA impact two years forward. A fee-only advisor who specializes in executive compensation can quantify the Medicare cost of taking the bonus versus deferring it, which can be compared against the cost of the planning engagement.
Most Americans drastically underestimate how much they need to retire and overestimate how prepared they are. But data shows that people with one habit have more than double the savings of those who don’t.
And no, it’s got nothing to do with increasing your income, savings, clipping coupons, or even cutting back on your lifestyle. It’s much more straightforward (and powerful) than any of that. Frankly, it’s shocking more people don’t adopt the habit given how easy it is.