What is year-end tax planning, and why does it matter for high earners?

Year-end tax planning is the process of reviewing your income, deductions, and investment decisions before December 31 to legally reduce what you owe for the current tax year. For high earners, it matters most because a single unplanned dollar of income can push you into the 37% federal bracket, trigger the 3.8% Net Investment Income Tax, or phase out deductions you were counting on. The decisions that shape your tax bill are almost always made before the year closes, not after.

What does year-end tax planning actually involve for someone earning a high income?

At its core, year-end tax planning high earners should prioritize is a coordinated review of three things: when income is recognized, which accounts hold which assets, and which deductions still apply after phase-outs reduce them.

The 37% federal bracket applies to income over $640,600 for single filers and $768,700 for married couples filing jointly in 2026. The 3.8% Net Investment Income Tax layers on top of that for interest, dividends, and capital gains once income crosses certain thresholds. What makes planning genuinely difficult at higher income levels is that multiple thresholds stack in a relatively narrow range. Between roughly $394,600 and $606,333, the QBI phase-in, the NIIT, and the SALT phase-out can all activate within the same income range. One extra dollar of income can trigger several simultaneous penalties, which is why a Q4 review is worth far more than a Q1 scramble after the fact.

The strategies that work best focus on deferring income into a lower-bracket year where possible, accelerating deductions into the current year where they will have the most value, and making sure assets are held in accounts where their growth is sheltered or taxed at preferential rates.

What changed in 2026 that high earners need to know before year-end?

Several rules shifted in ways that directly affect year-end decisions for anyone in the upper brackets.

The One Big Beautiful Bill Act, signed July 4, 2025, made most TCJA provisions permanent. The feared return to a 39.6% top rate did not happen. Rates remain at 10% to 37%, which means the planning framework most high earners built around current rates stays intact.

Key rule changes that affect year-end decisions include:

• SALT cap raised to $40,400 for 2026, but it phases out above $505,000 MAGI, never falling below a $10,000 floor, and it reverts to $10,000 in 2030.
• New charitable deduction floor: itemizers may only deduct charitable contributions that exceed 0.5% of AGI. Taxpayers in the 37% bracket also face a 2/37th reduction in itemized deductions, which caps the effective tax benefit of those deductions at 35%.
• QBI deduction made permanent: the Section 199A deduction was originally scheduled to expire, but the OBBBA extended it permanently, a meaningful win for pass-through business owners.
• 100% bonus depreciation revived: business owners who purchase qualified property before year-end may be able to deduct the full cost in the year of purchase rather than depreciating it over time.

See the full summary of 2026 tax law changes at Thomson Reuters for additional context on how these provisions interact.

How can maxing out retirement accounts still lower your tax bill this year?

Retirement accounts remain one of the most reliable tools for year-end tax planning high earners can use, though a significant new rule changes the math for some.

The employee deferral limit for 401(k), 403(b), and 457 plans is $24,500 in 2026. Workers age 50 to 59 and age 64 and older can add an $8,000 catch-up contribution. Workers age 60 to 63 qualify for a larger "super catch-up" of $11,250 instead.

Here is the critical change: anyone age 50 or older whose wages in the prior year exceeded $150,000 must make all catch-up contributions on a Roth basis only. The pre-tax catch-up option is no longer available for that group. This eliminates one traditional way to shelter income for high earners who are in or approaching peak earning years.

Self-employed individuals and business owners have more flexibility. SEP-IRA and Solo 401(k) contributions can reach up to 25% of compensation, capped at $72,000, making them a powerful pre-year-end deduction tool. The IRS retirement contribution announcement for 2026 confirms these limits.

The HSA is also worth funding before December 31 if you are enrolled in a qualifying high-deductible health plan. It is the only account that offers a deduction going in, tax-free growth, and tax-free withdrawals for qualified medical expenses. The 2026 limits are $4,400 for self-only coverage and $8,750 for family coverage, with an additional $1,000 catch-up for those age 55 and older.

For a deeper look at how these accounts fit into a longer-term retirement strategy, see how high earners should approach retirement tax planning in 2026.

Does charitable giving still make sense as a tax strategy at the top bracket?

It can, but the new rules require more planning than they did before.

Cash gifts to public charities remain deductible up to 60% of AGI, and gifts of appreciated long-term assets remain deductible up to 30% of AGI. The complication is the new 0.5%-of-AGI floor. For a taxpayer with $800,000 of AGI, the first $4,000 of charitable contributions produces no deduction at all. Smaller or scattered gifts throughout the year may not clear that floor, which is why bunching multiple years of donations into a single tax year, or routing them through a donor-advised fund, has become more important.

Taxpayers age 70 and a half or older have a cleaner option. A Qualified Charitable Distribution made directly from an IRA to a qualifying charity can reach up to $111,000 per eligible individual in 2026. A QCD excludes the distribution from taxable income entirely, can satisfy part or all of a required minimum distribution, and sidesteps the new 0.5%-of-AGI floor because it never passes through the taxpayer's income in the first place.

What should business owners and real estate investors do before December 31?

For business owners, the QBI deduction is one of the most valuable year-end levers available. Owners with taxable income at or below $201,750 (single) or $403,500 (married filing jointly) can claim the full 20% deduction with no wage or industry restrictions. Above those thresholds, the deduction is limited by W-2 wage tests, and owners of consulting, law, or financial service businesses lose it entirely above the upper income limit. Year-end income timing decisions, such as deferring a bonus or accelerating a deduction, can determine whether you land inside or outside those limits.

The revival of 100% bonus depreciation gives business owners and real estate investors another reason to act before year-end. Equipment purchases and certain property improvements placed in service before December 31 may qualify for an immediate full deduction rather than multi-year depreciation. Our team covers the mechanics and timing considerations in detail in what is bonus depreciation timing in 2026.

Flow-through business owners should also review PTET elections, loss limitations, and estimated tax payments before the year closes. Many of the most valuable opportunities expire on December 31 with no ability to go back. GRF CPA's year-end planning guide for flow-through businesses offers a useful framework for owners working through these decisions.

What about estimated taxes and gifting before the year ends?

Two items that often get overlooked deserve attention before December 31.

On estimated taxes, the IRS requires high earners to pay at least 110% of the prior year's tax liability to avoid underpayment penalties. If income grew significantly this year, a Q4 payment review is essential. Our team breaks down exactly how this calculation works in what counts as a qualified estimated tax payment to avoid an underpayment penalty.

On gifting, the annual gift tax exclusion is $19,000 per recipient in 2026. Gifts above that amount count against the $15 million federal lifetime exemption. With the lifetime exemption at its current level, the urgency to make large transfers is lower than in prior years, but annual exclusion gifting remains a straightforward, no-paperwork way to move wealth to family members or fund accounts like 529 plans over time. Those gifts must be completed before December 31 to count against the 2026 exclusion.

Year-end tax planning for high earners is ultimately about making decisions while you still can. After December 31, most of these levers are gone.