Have a $450,000 401(k) and Want to Donate to a Charity? Make Sure You Do This Before Year-End

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A 62-year-old couple in Charlotte posted to Bogleheads last winter asking why their $25,000 in annual charitable gifts had produced zero tax benefit for four straight years. With the 2026 standard deduction at $32,200 for married couples filing jointly and the SALT cap freshly raised, their itemized total kept landing just below the line. They gave $100,000 over four years and itemized none of it.

That is the trap. For households with $500,000 to $2.5 million in retirement assets and another decade of giving ahead, bunching multiple years of charitable contributions into a single tax year through a donor-advised fund (DAF) can convert a $0 deduction into roughly $37,120 of federal tax savings. The mechanic is simple. The timing is the entire game.

Why 2026 Quietly Changed the Math

Two provisions from the One, Big, Beautiful Bill reshape the calculus this year. The SALT cap jumped from $10,000 to $40,000 for married couples with income at or below $500,000, then phases down at a 30% rate above that threshold. And itemizers now face a new 0.5% AGI floor on charitable deductions, meaning the first half-percent of adjusted gross income given to charity is non-deductible.

A bigger SALT cap pulls more households into itemizing territory, but the AGI floor punishes small annual gifts. A couple giving $15,000 a year on $400,000 of income loses the first $2,000 every year. Bunch six years of gifts into one, and the floor only bites once.

A 35% marginal rate ceiling now caps the deduction value for top-bracket donors, which makes the 32% bracket the sweet spot for this strategy. That bracket covers incomes between $201,775 and $403,550 for joint filers in 2026, the exact band where most high-balance 401(k) holders in their early 60s land.

The $37,120 Scenario, Line by Line

Take a couple, both 62, with $450,000 AGI and a $1.4 million 401(k) balance. They give $25,000 a year to their church and two local nonprofits. They have $25,000 of state and property taxes plus $7,000 in mortgage interest.

Status quo: each year they itemize about $57,000 (SALT plus charity net of the floor). Against the $32,200 standard deduction, that produces roughly $7,900 in annual federal tax savings, or about $39,500 over five years.

Now bunch. They write a single $125,000 check to a DAF in 2026, then distribute grants to charities over the next five years. Year-one itemized deductions total $154,750 — SALT, mortgage interest, and deductible charity net of the AGI floor combined. At the 32% marginal rate, the federal tax cut lands near $39,200 in the bunch year alone. Years two through five they simply take the standard deduction.

The five-year benefit of bunching versus annual giving lands near $37,120 once the foregone standard deductions are netted out. The cash savings all hit in year one, which is where 401(k) coordination becomes powerful.

Stacking the Pre-Tax 401(k) Move in the Same Year

Year one is also the year to maximize pre-tax deferrals. The 2026 employee deferral limit is $24,500, with an $8,000 catch-up for ages 50 and over and an $11,250 super catch-up for ages 60 through 63. A 62-year-old can shovel $35,750 into the traditional 401(k), shaving another $11,440 off federal tax at 32%.

One caveat from a January 2026 New York Times piece by Ann Carrns: “employees 50 and older earning more than $150,000 who make contributions beyond the standard allowed amount must deposit that extra money into a Roth 401(k).” The catch-up portion no longer reduces current-year taxable income for high earners. The base $24,500 still does.

Three Actions Before December 31

1. Model two scenarios in tax software: annual giving versus a five-year DAF bunch. Use your actual AGI, SALT, and mortgage interest. The breakeven hinges on how close your normal itemized total sits to $32,200.
2. Fund the DAF with appreciated stock. Donating shares from a taxable brokerage account that have run up alongside the 10-year Treasury near 4.5% eliminates the embedded capital gain entirely while still producing the full fair-market-value deduction.
3. Pair the bunch year with a traditional 401(k) max, including the $11,250 super catch-up if you are 60 to 63. Skip the Roth catch-up election if your plan offers a choice and you earn over $150,000, since the deduction stacking is the point.

The couple in Charlotte ran the numbers in February. Their 2026 DAF contribution is already funded.

The post Have a $450,000 401(k) and Want to Donate to a Charity? Make Sure You Do This Before Year-End appeared first on 24/7 Wall St..