Donor-Advised Funds: When Bunching Years of Giving Lowers Your Tax Bill

If you give steadily every year and still take the standard deduction, your charitable giving is buying you little on your tax return: starting in 2026, non-itemizers can deduct at most $1,000 of cash gifts to public charities ($2,000 for married couples filing jointly). Bunching several years of that same giving into a donor advised fund in one year turns it into a deduction you use.

The Standard Deduction Problem

For 2026, the standard deduction for a married couple filing jointly is $32,200 ($16,100 for single filers). If your mortgage interest, state and local taxes, and charitable gifts do not collectively clear it, you get the standard deduction anyway and most of your giving adds nothing.

Disciplined givers lose here. They donate $8,000 to $12,000 a year, itemize nothing, and repeat the cycle indefinitely.

How Bunching into a Donor Advised Fund Changes the Math

A donor advised fund (DAF) is a charitable account held at a sponsoring organization. You contribute, take the deduction in the year of contribution, then recommend grants to your charities over time on your own schedule. That separation between funding and distributing makes bunching work.

An illustration for 2026. Suppose a married couple with $250,000 of adjusted gross income (AGI) gives $10,000 a year in cash and has $18,000 of other itemized deductions. Their $28,000 total never clears the $32,200 threshold, so each year they take the standard deduction plus the $2,000 non-itemizer charitable deduction, $34,200 in all. Now they fund three years of giving at once: $30,000 into a DAF in a single calendar year. Starting in 2026, itemized charitable gifts count only above 0.5% of AGI ($1,250 here), so $28,750 is deductible and total itemized deductions reach $46,750. Over the three years they deduct $111,150 ($46,750 plus 2 standard deductions of $32,200) against $102,600 without bunching. At a 32% marginal rate, that $8,550 difference is worth about $2,736 in federal tax savings for the same giving they were already planning to do. Larger gifts and appreciated stock can push the savings much higher.

The same cycle can repeat every three years.

Appreciated Stock Makes the Strategy Stronger

Funding the DAF with cash is fine. Funding it with long-term appreciated stock can do more.

Contribute stock that has grown from a $5,000 cost basis to $20,000 of current value and you deduct the full $20,000. You never recognize the $15,000 gain. The charity receives full market value.

In my work with pre-retirees holding employer stock or long-held positions, this is often the cleanest planning move available. It belongs in the tax side of how we plan, where the goal is structuring generosity well.

The Takeaway

Timing depends on whether a high-income year is coming. A business sale, a large bonus, an initial public offering (IPO), or a year with a big Roth conversion is when a deduction is worth the most, because it lands against your highest marginal dollars. (Starting in 2026, the tax value of itemized deductions is capped at 35% for anyone in the 37% bracket.)

Careful people can still leave money behind. Some bunch correctly, then fund the DAF with cash from checking while holding low-basis stock. The deduction is identical, and the embedded capital gain stays on their books. Others fund in an ordinary year, skip the spike year, and cut the deduction's value by a full bracket.

If you are giving meaningfully and not itemizing, the amount and the asset are worth thinking through together before you write this year's checks.

The information provided is for educational purposes only and does not constitute investment, legal, or tax advice. Consult with qualified professionals for guidance specific to your situation.