The final 10 weeks of 2026 bring hard Internal Revenue Service (IRS) cutoffs, and high earners stand to lose the most when those windows close.
Vanguard’s year-end tax-planning brief, published Oct. 14, 2026, outlines several moves filers must complete by Dec. 31, 2026, or lose their benefit.
Garrett Harbron, head of Advised Wealth Management Strategies at Vanguard, warns that the higher a taxpayer’s bracket, the more each missed deadline costs.
An overlooked Roth conversion, an unexecuted tax-loss harvest, or a late charitable transfer can inflate next year’s tax return by thousands.
Also Read: Vanguard notes a 2026 tax break most donors overlook
3 year-end tax moves that save top earners the most
Vanguard’s brief highlights three strategies that deliver the largest savings for high-bracket taxpayers before Dec. 31: harvesting investment losses, converting traditional retirement assets to a Roth, and bunching charitable contributions through a donor-advised fund.
Investors holding losing positions in taxable brokerage accounts can sell before Dec. 31 to lock in losses against this year’s gains, Vanguard noted. When losses exceed gains for the year, up to $3,000 can offset ordinary income, and any remaining balance carries forward indefinitely, according to the IRS.
Harbron noted that the benefit of harvesting losses is unequal across income levels, with investors in the highest brackets recapturing significantly more per transaction.
<strong>If you’re in a higher capital gains bracket, every dollar of tax-loss harvesting is worth more</strong>.
Converting traditional individual retirement account (IRA) or 401(k) assets to a Roth before Dec. 31 locks in this year’s tax rate. That deadline cannot be extended, so a top earner who misses the conversion window for a lower-income year forfeits the bracket advantage permanently, Clark.com confirmed.
Earners who bundle several years of charitable deductions through a donor-advised fund face the same Dec. 31 settlement deadline. A bunched contribution that clears the standard deduction threshold produces a large, single-year write-off that smaller annual gifts would not generate, Vanguard noted.
A missed RMD triggers a 25% excise tax that hits top earners hardest
Retirement savers past age 73 face a 25% IRS excise tax on any missed RMD, a penalty that grows with account size and hits top earners hardest, the IRS stated. The SECURE 2.0 Act, Section 302, reduced the penalty from 50% to 25%, and further to 10% if the shortfall is corrected within two years.
Those who turned 73 this year have until April 1, 2027, to take their first distribution from a traditional IRA or workplace retirement account. Delaying forces two mandatory withdrawals into the same calendar year, potentially bumping retirees into a higher bracket for 2027.
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Each tax-deferred workplace account requires its own RMD calculation, so retirees with multiple 401(k) plans must pull a distribution from each one individually. Traditional IRA holders can aggregate their total RMDs and withdraw from a single account, but that flexibility does not extend to workplace plans, Clark.com noted.
Workers who own less than 5% of the company and stay employed can delay RMDs from their current 401(k) until retirement. That exception does not cover IRAs or old 401(k) balances from previous jobs, which still face the Dec. 31 RMD deadline.
A $111,000 qualified charitable distribution can satisfy an RMD without a tax bill
Retirees aged 73 and older who are also subject to an RMD can satisfy that obligation without adding a dollar to 2026 taxable income. They need to use a qualified charitable distribution, which is available to IRA owners from age 70½, Fidelity noted.
A qualified charitable distribution (QCD) directs funds from an IRA custodian to a 501(c)(3) charity, and the transfer counts toward the year’s RMD.
The annual QCD cap for 2026 sits at $111,000 per individual, or $222,000 for married couples filing jointly. Because the QCD bypasses gross income, top earners can cover large required minimum distributions without the bracket creep a standard withdrawal would create.
Withdrawing the funds into a personal account first and then donating them disqualifies the transaction, converting it into a taxable distribution.
How retirees and high earners should use the remaining weeks before year-end
Retirees past age 73 who give to charity should complete a QCD before taking any other IRA distribution for the year, Fidelity recommended.
That ordering keeps the RMD out of taxable income, preserving eligibility for a same-year Roth conversion in a lower bracket, according to the Vanguard brief.
Retirees planning a QCD should start the process before the final weeks of December to avoid missing the year-end deadline, Clark.com reported.
Harbron stressed that households managing overlapping year-end deadlines should consult a tax professional before executing any of these transactions.
A Roth conversion that does not account for Income-Related Monthly Adjustment Amount (IRMAA) threshold crossings can generate costs that erase the intended savings, Clark.com warned.
Retirees already drawing Medicare benefits face a secondary IRMAA trap: A two-year lookback means a 2026 Roth conversion can push 2028 Part B premiums into a higher surcharge tier.
Related: High earners rethink maxing out 401(k) retirement savings
