Donor-Advised Fund Case Study: Beating the 2026 AGI Floor
For high-earning professionals in the Accumulation Zone and retirees in the Red Zone, Q4 is the critical window for proactive tax planning. By the time December 31 passes, the concrete on your 2026 tax bill has dried.
This year, year-end planning is more crucial than ever due to the passage of the One Big Beautiful Bill Act (OBBBA), which brought a massive shift to the tax code on January 1, 2026. While OBBBA made the TCJA ordinary income tax structure permanent, it also introduced a new hurdle for generous families: the 0.5% AGI floor on itemized charitable contributions.
As your Personal CFO, my goal is to help you experience a “Metanoia”—a fundamental change in perspective. Rather than letting new tax friction reduce your Kingdom impact, we want to optimize your generosity. To show you exactly how this works, here is a donor-advised fund case study based on strategies we are actively deploying for clients right now.
The Problem: The New 2026 Charitable Floor
To understand the strategy, we must first understand the new rules. Beginning in 2026, if you itemize your deductions, you can only deduct charitable contributions that exceed 0.5% of your Adjusted Gross Income (AGI).
Let’s look at a hypothetical family—we’ll call them the Clarks.
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The Profile: A married couple in their peak earning years with an AGI of $400,000.
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The Giving: They faithfully practice biblical stewardship, giving $40,000 annually to their church and local ministries.
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The 2026 Problem: Under the new rules, their 0.5% AGI floor is $2,000 ($400,000 x 0.5%). This means the first $2,000 of their giving provides absolutely zero tax benefit. If they continue giving $40,000 every single year, they will lose the tax deduction on $2,000 of their generosity annually. Over a five-year period, that is $10,000 of “dead money” from a tax perspective.
The Solution: The “Bunching” Strategy
To neutralize this tax trap, we shift the Clarks from a reactive check-writing habit to a proactive donor-advised fund case study framework.
A Donor-Advised Fund (DAF) acts as a personal charitable checking account. You receive an immediate tax deduction in the year you fund the account, but you retain the flexibility to distribute the grants to your favorite charities over time.
Instead of writing a $40,000 check each year and repeatedly getting penalized by the 0.5% AGI floor, we advise the Clarks to “bunch” three years of giving into Q4 of 2026.
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The Q4 Deposit: The Clarks deposit $120,000 into a DAF before December 31, 2026.
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Beating the Floor: In 2026, their floor is still $2,000. However, because they made a massive $120,000 contribution, they successfully deduct $118,000 this year. By bunching, they only had to cross the $2,000 floor once instead of three separate times.
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Ongoing Generosity: Over the next three years (2026, 2027, 2028), they grant the standard $40,000 out of their DAF to their church. Their church receives the exact same steady support, but the Clarks capture a significantly larger tax deduction upfront.
Upgrading the Strategy: Donating Appreciated Assets
To truly maximize this donor-advised fund case study, we take the strategy one step further. We rarely recommend funding a DAF with cash.
If the Clarks have a taxable brokerage account containing highly appreciated stock—perhaps shares they bought years ago that have grown substantially—they face a steep capital gains tax if they ever sell it. Instead of selling the stock and donating the cash, we transfer the shares directly into the DAF.
By doing this, the Clarks receive the full fair market value deduction for the stock, completely erase the capital gains tax liability, and successfully beat the 2026 AGI floor. The charities eventually receive the funds tax-free. It is a triple-win that perfectly illustrates true investment stewardship.
(For more details on how these accounts operate, you can review the IRS guidelines on Donor-Advised Funds.)
Writing Your Own Legacy Story
Biblical stewardship is about giving with purpose, ensuring your wealth blesses others rather than being lost to the IRS. By proactively executing strategies like this before the year closes, you take control of your financial legacy.
If you want to read more about how we integrate these tax strategies with your overall portfolio, review our guide to Asset Location Strategy.
As your Personal CFO, guiding clients through complex Q4 tax scenarios is the proactive planning my team—including Cherice and Abby—does every day. If you want to ensure your year-end giving is fully optimized before the December 31 deadline, time is running short.
Click here to schedule an introductory Fit Call with our team today.
