How bunching works
The standard deduction is yours every year with no receipts, so deductible spending only pays off once your itemized total climbs past it. Spend a steady amount that falls just short and those payments bring no tax benefit at all; spend a little more and only the excess counts.
Bunching changes the rhythm, not the amount. Instead of giving $15,000 a year, you give $30,000 every other year. In the heavy year your Schedule A total clears the standard deduction by a wide margin. In the light year you take the standard deduction, which you would have received anyway.
What it is worth depends on where you start. If you already itemize every year, a two-year bunch gains roughly your standard deduction minus the deductions you can’t move, such as mortgage interest and most state taxes. If you don’t itemize today, it gains however far the bunched year’s total clears the standard deduction. Either way, multiply by your tax rate.
What you can bunch, and how
Charitable giving is the easiest expense to move, because you choose when to give. A gift counts in the year you make it: when a check is mailed, when a credit card is charged, or when stock is delivered to the charity. A pledge or promissory note doesn’t count until you pay it.
A donor-advised fund (DAF) separates the deduction from the grants: you contribute several years of giving in the bunch year, deduct it then, and recommend grants to your chosen charities over the following years. Giving shares held more than a year instead of cash adds a second benefit: you can generally deduct their market value and never pay capital gains tax on the growth, within a 30%-of-AGI limit.
Medical costs can be bunched only by scheduling elective care into one year, since only the part above 7.5% of AGI counts and payments for care in a later year generally aren’t deductible early. Tax payments are the hardest to move: property tax can be prepaid only once assessed, and every dollar stays inside the SALT cap of $40,400 for 2026. Mortgage interest mostly follows the loan’s schedule.
How the 2026 rules change the math
The Tax Cuts and Jobs Act sharply raised the standard deduction from 2018, which is what turned itemizing into an every-other-year proposition for many households rather than an annual habit. The One Big Beautiful Bill Act kept that structure permanently and added rules starting in 2026 that push in both directions, so a plan that worked in 2024 deserves a fresh run with your own numbers before the next bunch year. Five changes matter most:
- A higher bar: the 2026 standard deduction is $32,200 joint and $16,100 single, so more households need bunching to itemize at all.
- More room for taxes: with SALT capped at $40,400, some high-tax households itemize every year; if taxes and mortgage interest alone exceed the standard deduction, bunching adds little.
- The 0.5% floor: itemizers lose the first 0.5% of AGI in gifts each year, generally with no carryforward, so a two-year bunch pays the floor once instead of twice.
- The non-itemizer deduction: off years can still deduct up to $1,000 ($2,000 joint) of cash gifts made directly to public charities, though not to a DAF.
- The top-bracket haircut: in the 37% bracket each deducted dollar saves at most 35 cents. Under the alternative minimum tax, gifts stay deductible but state taxes don’t.
Who bunching suits
Bunching fits households whose itemized total sits near the standard deduction, who give regularly and can afford to fund several years of giving at once: often people who have paid off or nearly paid off a mortgage, and retirees with steady giving. It pays best when the bunch year is also a high-income year, such as the year of a bonus, a business sale or a large Roth conversion, because each deducted dollar is then worth your higher marginal tax rate.
It suits less well when fixed deductions such as taxes and mortgage interest already exceed the standard deduction, when you can’t spare several years of giving at once, or when you are 70½ or older with a traditional IRA, where qualified charitable distributions of up to $111,000 (2026) often work better. Many retirees combine the two: QCDs for regular gifts, a bunched DAF contribution of appreciated shares in a high-income year.
Common bunching mistakes
Bunching changes when money actually moves, so the traps are about timing and limits rather than paperwork. The deduction follows a completed payment, and each category keeps its own floor or cap in the bunch year. A December gift charged to a credit card counts in December even if you pay the card in January, but a gift pledged in December and paid in January belongs to January. Most slips happen in the first cycle, while old annual habits and the new two-year rhythm overlap.
- Prepaying property tax that hasn’t been assessed, or state tax above the cap: neither adds anything.
- Counting grants from a donor-advised fund as new gifts. The deduction happens once, when you fund the DAF.
- Ignoring AGI ceilings: 60% for cash to public charities and 30% for appreciated stock. Excess carries forward five years, and special rules apply when a carryover year is a standard-deduction year.
- Expecting lower Medicare premiums. Itemized deductions don’t reduce modified AGI, so bunching won’t move IRMAA tiers.
Illustrative numbers
A married couple under 65 with $160,000 of AGI, giving $15,000 a year
- Bunched-year itemized total
- Fixed deductions plus two years of movable ones, such as gifts, after floors and caps
- Standard deduction
- $32,200 married filing jointly or $16,100 single for 2026, plus any age-65 or blindness add-on
- Usual itemized total
- What Schedule A would allow in a normal, unbunched year
It ignores the 2026 non-itemizer deduction for up to $1,000 ($2,000 joint) of cash gifts, available in any year you take the standard deduction.
Fixed deductions each year: $12,000 SALT + $8,000 mortgage interest$20,000
Unbunched: $20,000 + ($15,000 − $800 floor), each year$34,200 × 2 = $68,400
Bunched year: $20,000 + ($30,000 − $800 floor)$49,200
Off year: 2026 standard deduction$32,200
Two-year total, bunched$81,400
Extra deductions, taxed at 22%$13,000, saving $2,860
Giving the same $30,000 on a two-year rhythm adds $13,000 of deductions and saves $2,860 over two years: the $32,200 standard deduction minus $20,000 of fixed deductions, plus the $800 floor paid once instead of twice. Routing the $30,000 through a donor-advised fund lets the charities still receive $15,000 a year.
At a glance
Common ways to bunch deductions, with the 2026 limits that apply
| Tool | How it helps you bunch | Limit or catch |
|---|---|---|
| Donor-advised fund | Deduct several years of gifts when you fund it; recommend grants later | Deducted once, when funded; doesn’t count for the non-itemizer deduction |
| Gifts of appreciated shares | Deduct market value of shares held over a year; skip the capital gain | 30%-of-AGI limit for public charities; excess carries forward five years |
| Timing medical care | Pay for elective care in the bunch year; card charges count when made | Only costs above 7.5% of AGI count; no prepaying for future care |
| December property tax or state estimated payment | Moves a tax payment into the bunch year | Property tax must be assessed; all SALT stays under the $40,400 cap |
| Qualified charitable distribution (70½+) | Gives from an IRA without adding income, in any year | Up to $111,000 in 2026; not deductible, and needs no itemizing |
Put it in your plan
Bunching Deductions in MoneyWhatIf
MoneyWhatIf reprices the standard-versus-itemized choice in every projected year. Its federal Schedule A adds declared giving, declared medical costs, modeled state and local income tax, the personal share of property tax and allowed mortgage interest, applies each floor and cap, and keeps the larger deduction. After a What-If change to declared giving, the Deductions ledger shows the itemized figure only in years it wins, and Tax analytics shows how those years and lifetime taxes move. A QCD option can pay declared giving from an IRA from age 71, the model’s stand-in for 70½.
Common questions
Bunching Deductions FAQs
Is bunching deductions legal?
Yes. Bunching only changes when you make payments you could make anyway, and each deduction is claimed in the year the payment actually happens. Nothing requires you to give the same amount every year. Keep the usual bank records and written acknowledgments for every gift.
Can I bunch charitable gifts without a donor-advised fund?
Yes. Give two years’ worth directly to your charities in the bunch year, for example by sending next year’s gift before December 31, then give only small cash gifts the following year, which the non-itemizer deduction covers up to $1,000 ($2,000 joint). The trade-off is that your charities receive money unevenly, which a donor-advised fund smooths by paying out grants each year.
Can I bunch with a donor-advised fund and still give every year?
Yes, that is the usual design. You fund the DAF with two or more years of giving in the bunch year and deduct it then, keeping the sponsor’s written acknowledgment that it has exclusive legal control of the money. Your charities then receive the grants you recommend each year. Grants bring no second deduction, and DAF contributions don’t count toward the $1,000 or $2,000 non-itemizer deduction.
How often should you bunch deductions?
Every other year is the usual rhythm, but the right cycle is however many years of gifts it takes to clear the standard deduction by a useful margin. A couple with $10,000 of fixed deductions and $8,000 of yearly gifts gains nothing from a two-year bunch, since $26,000 falls short of $32,200, but narrowly clears the bar with a three-year bunch. Others bunch once, into a DAF, in a single high-income year.
Should retirees over 70½ bunch or use QCDs?
Often QCDs, for gifts from a traditional IRA. A qualified charitable distribution is excluded from AGI, counts toward required minimum distributions and works whether or not you itemize, so it can lower Medicare premiums and the taxable share of Social Security. Bunching still helps for gifts beyond the IRA, such as appreciated shares given to a donor-advised fund.