Bunching in the Floor Era: How Many Years of Giving Should You Stack at Once?
- J.T. Hardcastle
- Jul 27
- 7 min read
For most of the years you have been giving, the size of any single gift barely mattered for your taxes. You gave, you itemized, the deduction followed. Starting in 2026, the size and the timing of your gifts suddenly carry real weight, and one planning question has moved to the front of the line: when you bunch your giving, how many years should you actually stack into one?
Bunching itself is not new. The idea is simple enough to say in a breath: instead of giving a moderate amount every year, you concentrate several years of gifts into a single tax year, deduct it all at once, and let a donor advised fund hand the money out to your causes on the old schedule. What is new is the pressure making bunching almost mandatory for a lot of ordinary, faithful givers, and the fresh set of tradeoffs that decide whether a two-year, three-year, or five-year stack is the right one. That sizing decision is the whole game now, and it is worth getting right.
Start With the Bar You Are Trying to Clear
Two changes reshaped the math, and they pull in the same direction. The first is the standard deduction, which keeps climbing. For 2026 it sits at $32,200 for a married couple filing jointly. If everything you can itemize, giving included, does not add up to more than that, you take the standard deduction and your generosity does nothing at tax time.
The second change is smaller in dollars but sneakier in effect. Beginning in 2026, itemizers can only deduct the portion of their charitable gifts that lands above 0.5% of adjusted gross income. The first half-percent earns nothing. On $400,000 of income, that is $2,000 shaved off the top of your giving before a single dollar counts. And because the floor resets every year, it quietly punishes the steady giver — the person who writes the same faithful check to the same causes twelve months in a row hits that floor every single year, while the person who stacks the same total into one year hits it only once.
Put those two together and a picture forms. Spread your giving thin, and it can vanish into the gap between your gifts and the standard deduction, taking the annual floor haircut the whole way. That is the problem bunching solves, and it is why what bunching is and how a donor advised fund makes it painless has become one of the most useful things a generous household can understand right now. But knowing to bunch is only half of it. The number of years you stack is what determines whether the strategy quietly wins or barely moves the needle.
The Real Question Is Not Whether to Bunch — It Is How Many Years
Here is the piece most articles skip. A bunch only helps to the degree that it lifts your total itemized deductions comfortably above the standard deduction. Stack too few years, and you never clear the bar, so you have concentrated your giving for no benefit at all. Stack the right number, and every dollar above that line finally counts.
Look at what happens to a married couple with $400,000 of income, about $10,000 of other itemized deductions, who give $20,000 a year. Giving one year at a time, their deductions reach only $28,000 — short of the $32,200 bar, so their giving earns nothing. Bunch two years, and they clear it decisively. Bunch three or five, and they clear it by a wide margin. The chart makes the point plain: below a certain number of years, bunching does not work; above it, it works better and better. Finding your own version of that threshold is the actual task.
Four Things That Set the Right Number
The right stack size is personal, but four factors decide it.
How close your giving already sits to the bar. If your normal giving plus your other deductions land just under the standard deduction, a modest two-year bunch may be all you need to jump over it. If you fall far short, you will need to stack more years to make the leap worthwhile.
How much you give. A household giving $8,000 a year needs to stack more years to build a meaningful deduction than one giving $50,000 a year. Bigger annual giving means fewer years are required to clear the bar, which is why generous high-income households often bunch on a shorter cycle.
The AGI ceilings on what you can deduct. This is the guardrail on the top end, and it is easy to forget. Cash gifts to a donor advised fund are deductible up to 60% of your AGI in a single year, and gifts of appreciated stock up to 30%. Stack so many years that your one big gift blows past that ceiling and you cannot use the whole deduction now — though anything you cannot use carries forward for up to five years. A carryforward is not a loss, but it does delay the benefit, so the cleanest bunch is usually one you can fully absorb in the year you make it. This is the same ceiling that makes front-loading a fund during a peak-income year so effective, because a high-income year gives you more room to deduct.
How confident you are in your future giving. Bunching asks you to commit, in advance, to the giving you would have done over the next several years. If your income and intentions are steady, a longer stack is comfortable. If your situation is in flux, a shorter two- or three-year bunch keeps you flexible while still beating the floor.
Whether a two-year or a five-year stack fits you depends on your income, your giving rhythm, and how much room you have under the AGI ceiling. Our DAF calculator runs the scenarios side by side on your own numbers.
Curious how many years you should stack? See it in the DAF Calculator.
A Worked Example
Picture that same couple again — $400,000 of income, $20,000 of yearly giving, no mortgage, and roughly $10,000 of other deductions. Giving steadily, they never reach the $32,200 standard deduction, so year after year their $20,000 of real generosity earns them nothing, and the annual floor trims a little more.
Now they bunch three years at once. They move $60,000 into a donor advised fund in a single year, ideally funded with appreciated stock so they also skip the capital gains tax on the shares. Their itemized deductions that year jump to roughly $68,000 — well past the standard deduction and comfortably inside the 60% and 30% AGI ceilings. For the next two years they take the standard deduction and recommend grants from the fund at their usual $20,000 pace. Their church and ministries see no change at all: same gifts, same timing. Only the couple's tax outcome changes, and it changes by thousands of dollars a year. Choosing three years rather than one is what turned the strategy from a nice idea into a real result.
Had they stacked only one year, they would have concentrated their giving and still fallen short of the bar — all inconvenience, no benefit. Had they stacked ten years, they might have overshot the AGI ceiling and pushed part of the deduction into a carryforward. Three was the number that fit. Yours may be two, or five. The point is that the number is a decision, not a default.
When a Smaller Stack Is Smarter, and When a Bigger One Is
A shorter bunch — two or three years — tends to be the better fit when your giving is moderate, when you want to stay flexible, or when a longer stack would run past your AGI ceiling. It clears the floor and the standard deduction without asking you to lock up a decade of giving in one move.
A longer bunch — four or five years — earns its keep when you have a genuinely high-income year to absorb a large deduction, when you are funding the gift with highly appreciated assets, or when you give enough that concentrating more years produces a materially larger benefit. A liquidity event, a big bonus, the sale of a business or a property — these are the moments a larger stack was made for.
And do not waste the off years. In the years between bunches you take the standard deduction anyway, but if you are over 70½ you can still give straight from an IRA through a qualified charitable distribution, which satisfies part of your required minimum distribution and never touches your taxable income. Pairing a bunched fund contribution in the big year with those direct gifts in the off years lets you keep giving every year while only itemizing once.
Where to Start
If this resonates and you want something concrete to do, here is where I would begin.
1. Find your bar. Add up your predictable non-charitable deductions and subtract that from your standard deduction. The gap is roughly how much giving you need to stack into one year to make itemizing worthwhile.
2. Find your floor and your ceiling. Half a percent of your expected income is the slice that earns nothing each giving year. Sixty percent of your income (thirty for appreciated assets) is the most you can deduct in one year. Your stack should live comfortably between those two lines.
3. Pick a number of years you can commit to. Two and three are the common, flexible choices; five suits steady, higher-capacity givers and big-income years. Choose the span you are genuinely confident about.
4. Fund it well. Using appreciated stock or other long-held assets to fill the bunch lets you clear the bar with a larger gift while sidestepping the capital gains you would owe on a sale.
None of this requires an estate attorney or a complicated structure. It requires treating the size of your bunch as a choice worth a few minutes of thought rather than a round number picked out of habit. The floor era did not make generous people less generous. It simply put a price on giving without a plan — and handed a quiet reward to anyone willing to ask how many years they should stack before they write the check.
Every household's number sits in a different place, and the version of this that fits you is rarely the one a general article can describe. The conversations that turn "interesting idea" into "actual plan" happen one set of numbers at a time.
Wondering how many years you should stack? Let's look at your numbers together — 30 minutes, no pitch.
J.T. Hardcastle is a Partner at Sage & Main who helps families and business owners align their wealth with their values through tax-smart planning and intentional generosity.
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