Charitable Planning in a Year of Sudden Wealth

Not tax or legal advice. Every sudden-wealth situation involves fact-specific tradeoffs between charitable vehicles, basis, income timing, and estate goals. Model your specific scenario with a fee-only charitable planning advisor before December 31.

Most years, a $500K earner faces the same charitable math: take the standard deduction or batch a few years of giving into a DAF. But in the year you sell a business, exit an IPO, receive a large inheritance, or experience any event that spikes income to $2M–$10M or beyond, the dynamics shift entirely. Your deduction ceiling is at its peak. Your marginal rate is at its peak. And the window closes at midnight on December 31.

This guide is for that year — the one-time event that requires a different playbook.

What qualifies as a sudden-wealth year

Any event that pushes income well above your typical range triggers the same strategic considerations:

• Business sale or M&A exit — sale proceeds taxed as ordinary income (asset sale) or capital gain (stock sale), often $1M–$20M+
• IPO or secondary offering — founder or early-employee shares becoming liquid, often with lockup expiration
• Large inheritance of cash or securities — cash inheritance is not taxable income, but the inherited portfolio and any subsequent sale of assets may be
• Large capital gain distribution — sale of real estate, partnership interest, or concentrated equity position
• Settlement or judgment — typically ordinary income unless compensatory for physical injury
• RSU cliff vesting — large tech or pre-IPO grants vesting in a single year

Each has different tax character (ordinary income vs. capital gain), different timing constraints, and different implications for which charitable vehicles apply. A business asset sale and an IPO lockup expiration require different strategies — but both benefit from acting before year-end.

The assignment of income trap (critical for business sales)

If you're selling a business, the most important charitable planning rule is not the deduction limit — it's the assignment of income doctrine. The IRS will disallow a charitable deduction and attribute the gain to you if you make a gift after the right to receive income has already "ripened."¹

In practice: your gift of company stock to a DAF or CRT must close before you sign a binding purchase agreement. A nonbinding letter of intent with no penalty for walking away generally does not trigger assignment of income. A signed purchase agreement or any agreement that legally compels the sale does. The sequence that works:

1. Identify the charitable vehicle and amount
2. Transfer shares to DAF, CRT, or private foundation
3. Sign the purchase agreement
4. Close the sale (charity sells its shares as part of the transaction)

Reversing steps 2 and 3 can cost you the entire charitable deduction and leave you owing capital gains on shares you've already given away. See our pre-sale charitable planning guide for the S-corp, partnership, and C-corp specifics.

The 2026 tax math: why the sudden-wealth year is different

Two OBBBA provisions reshaped the math for 2026 and beyond:

• 0.5% AGI floor — only the portion of total contributions exceeding 0.5% of AGI is deductible.² On $3M AGI, the first $15,000 of giving produces no deduction. On $200K AGI, the floor is only $1,000. The higher your income year, the more of your giving clears the floor.
• 35% deduction cap — for taxpayers in the 37% bracket (MFJ income above $768,700), charitable deductions reduce taxes at 35 cents per dollar, not 37.² This changes the savings rate but not the direction: a large deduction in a 37% year is still far more valuable than the same deduction in a 24% year.

The AGI limits that existed before OBBBA still apply:

• Cash contributions to a DAF or public charity: up to 60% of AGI³
• Long-term appreciated property (stock, real estate): up to 30% of AGI³
• Excess carries forward five years

In a $3M income year, these ceilings are $1.8M (cash) and $900K (stock). Most donors never get close to those limits in a normal year; they do in a sudden-wealth year.

Worked example: $3M business sale, appreciated stock available

You sell your business for $3M in ordinary income. You also hold $800K of appreciated company stock (cost basis $100K, held more than 1 year).

Without charitable planning:

• Federal tax on $3M, MFJ: approximately $950K–$1.0M (simplified)
• Future LTCG on $800K stock when sold: $700K gain × (20% + 3.8% NIIT) = $166,600

With appreciated stock gift to DAF before sale:

• OBBBA floor: $3M × 0.5% = $15,000
• Deductible stock gift: $800,000 − $15,000 = $785,000 (within the 30% × $3M = $900K limit)
• Tax savings at 35% cap: $785,000 × 35% = $274,750
• Capital gains avoided on donated stock: $700,000 × 23.8% = $166,600
• Total benefit: $441,350

Why appreciated stock beats cash: If you gave $800K cash instead, you would still owe capital gains on the stock when you eventually sell it. The appreciated stock gift eliminates that liability entirely — the charity sells the shares tax-free inside the DAF — while generating the same income tax deduction.

See our appreciated stock gift calculator to model your specific basis and holding period.

Choosing the right vehicle

The amount you intend to give in the year of the event drives which structure makes sense:

A Charitable Remainder Trust is often the most powerful tool when the wealth is in appreciated property. You transfer the asset to the CRT before sale, take a partial deduction in the high-income year, and receive an income stream over time — often 5–8% of the trust value per year. The capital gain is spread across distributions rather than recognized in a single year. See the CRT calculator to model income, deduction, and gain-spreading for your situation.

Coordinating with Roth conversions

This may sound counterintuitive: a Roth conversion in the same year as a large income event adds more income — but it also raises your AGI, which raises the 60% cash deduction ceiling. A $500K Roth conversion in a $3M income year increases your deductible DAF contribution limit by $300K (60% × $500K). If you were going to do Roth conversions in the next several years anyway, concentrating them in the sudden-wealth year can amplify the value of a large DAF contribution. See the Roth conversion + charitable giving guide for the mechanics and worked scenarios.

Year-of-event timeline

Charitable planning in a sudden-wealth year is not a December project. The vehicles with the most leverage are also the ones with the longest setup lead times:

See our year-end giving deadlines guide for the full calendar, including the USPS postmark rule change effective December 2025.

Common mistakes in sudden-wealth charitable planning

• Waiting until December to start. CRTs, private foundations, and closely-held stock appraisals cannot be completed in a week. Start in Q2–Q3 of the transaction year at the latest.
• Giving cash when you have appreciated stock. If you hold appreciated securities with a low basis, giving those first — and keeping the cash — saves both income tax and capital gains tax. Cash will not save capital gains on a future stock sale.
• Signing the purchase agreement before transferring shares. Assignment of income is not a technicality; courts and the IRS take it seriously. Once income has ripened, the deduction is gone.
• Ignoring the 5-year carryover. You can't deduct more than 60% of AGI (cash) or 30% (appreciated property) in a single year. Gifts above those limits carry forward — but only if you file the return correctly. An excess contribution carryover is valuable but requires tracking.
• Confusing the 35% cap with a reason not to give. The cap means your deduction saves $35 per $100 instead of $37. That is still the highest rate at which a charitable deduction can save taxes anywhere in the U.S. tax code. The sudden-wealth year is not the year to reduce your giving — it's the year the government is most willing to co-invest alongside you.
• Skipping the advisor for "small" amounts. The delta between a naive and an optimized gift strategy in a $3M income year is routinely $150K–$400K. The cost of a specialist advisor is measured in hours, not in meaningful fractions of that delta.

Documentation requirements

Large gifts in a sudden-wealth year often involve complex assets — closely-held stock, partnership interests, real estate — that require qualified appraisals and Form 8283. Cutting corners on documentation is the fastest way to lose the deduction entirely. See the full documentation requirements guide for IRS substantiation rules by asset type and gift size.