The standard deduction is large enough that most filers take it, which means their charitable giving produces no tax benefit at all. Giving a meaningful amount every year and never itemizing means the deduction exists on paper and is never used.
Bunching fixes the arithmetic by concentrating deductions into alternating years so that at least every other year clears the threshold.
This is general information, not tax advice. Thresholds and rules change; consult a qualified professional.
What changed in 2026
- The standard deduction stayed high. With the elevated level made permanent, the share of filers who itemize remained small, keeping bunching relevant.
- Donor-advised fund adoption grew. Their fit with bunching — deduct now, distribute over years — drove continued growth in accounts.
- Deduction limitations got more attention. Caps and floors on specific deduction categories affected how much bunching actually achieves for some filers.
- Charity cash flow concerns persisted. Recipients receiving lumpy rather than steady support remained a real consideration for organizations.
How the arithmetic works
| Approach |
Year one |
Year two |
Total benefit |
| Give annually, below threshold |
Standard deduction |
Standard deduction |
No benefit from giving |
| Bunch two years into one |
Itemize, exceeding threshold |
Standard deduction |
Benefit on the excess above the threshold |
The mechanism is simply that you take the larger of your itemized total or the standard deduction, never both. Spreading deductions evenly across years so that neither exceeds the threshold means neither year produces any benefit. Concentrating them means one year does.
The benefit is the amount by which the bunched year exceeds the standard deduction — not the whole donation. That matters for estimating whether the exercise is worth the complexity.
Making it practical
The obvious objection is that charities need consistent support, and giving them two years of funding at once then nothing the following year is worse for them.
A donor-advised fund resolves this. You contribute a lump sum in the bunch year and take the deduction then; the fund distributes to charities on whatever schedule you choose, including steadily over several years. The deduction timing and the giving timing are decoupled entirely, which is the main reason these accounts pair so well with the strategy. The mechanics are in donor-advised funds.
Other expenses can be bunched too, within limits. Some medical expenses are deductible above a floor, so concentrating elective procedures into one year can clear it. Certain state and local tax payments have timing flexibility, subject to caps. Property tax payments can sometimes be accelerated or deferred slightly.
Watch the caps. Deduction categories have their own limits, and bunching more into a year where a cap already binds adds nothing.
For those old enough, a qualified charitable distribution from a retirement account is frequently better than either approach, because it works regardless of whether you itemize — see qualified charitable distributions.
Common mistakes
- Bunching when you already itemize comfortably. No additional benefit.
- Calculating the benefit as the full donation. It is only the excess above the threshold.
- Ignoring category caps. Bunching into a capped category achieves nothing.
- Forgetting the charity's cash flow. Use a donor-advised fund to smooth distributions.
- Overlooking the retirement account route. Frequently better if you are eligible.
- Not modelling both years. The strategy is a two-year plan; evaluate it as one.
FAQ
How often should I bunch?
Every other year is the common pattern. Larger givers sometimes bunch across three years for a bigger single-year total.
Does a donor-advised fund contribution deduct immediately?
Generally yes, in the year of contribution, subject to the usual limits. Distributions to charities happen later on your schedule.
What if my income varies?
Bunch into the higher-income year where possible, since the deduction is worth more at a higher marginal rate.
Are appreciated assets better to donate than cash?
Frequently, since donating appreciated securities held long enough can avoid the capital gain and still deduct the value. Worth discussing with a professional.
Where to go next
For the vehicle that makes bunching practical, read donor-advised funds. For the retirement account alternative, qualified charitable distributions, and for gain avoidance, capital gains tax explained.