Spreading donations evenly often lands below the standard deduction each year, deducting nothing extra — bunching concentrates giving to clear that threshold.
How it works
The unbunched scenario takes the larger of the standard deduction or itemized total each year, for two years. The bunched scenario itemizes two years of donations plus other itemized deductions in year one, then takes the standard deduction in year two — the difference is the extra combined deduction from bunching.
What this does not include
This site’s separate donor-advised-fund calculator covers the common vehicle used to actually execute bunching — contributing multiple years of intended giving to a DAF in one year, then distributing it to charities over time.
How to use this calculator
- Enter the standard deduction, typical annual donation, and other itemized deductions per year.
Frequently asked questions
When does bunching provide the biggest benefit?
When typical annual itemized deductions (donations plus other items) fall just below the standard deduction each year — bunching pushes one year well above it while the other year still claims the full standard deduction.
Does bunching change how much is actually donated?
No — the same total amount goes to charity over the two years; bunching only changes the *timing* of when it’s given, to align with a bigger tax benefit.
What’s a donor-advised fund’s role in bunching?
It lets a donor take the full tax deduction in the bunched year while still distributing the actual charitable gifts to specific organizations gradually over time, rather than all at once.
