Bunching tax deductions means pushing two or more years’ worth of flexible deductible expenses into a single tax year so your itemized total clears the standard deduction by a comfortable margin, then taking the standard deduction in the off year. For 2026, the standard deduction is $32,200 for married couples filing jointly and $16,100 for single filers, and most households’ ordinary deductible spending falls short of those numbers.1Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026 Bunching turns timing into tax savings by making sure the dollars you spend on charity, state taxes, and medical care actually produce a deduction instead of being absorbed by a threshold you never cross.
Why the Standard Deduction Changes the Math
Every filer picks the larger of the standard deduction or total itemized expenses. If your itemized expenses fall below the standard deduction, every dollar you spent on deductible items that year produced zero tax benefit. You’d have been in the same tax position giving nothing and paying no deductible state taxes.
That gap is what bunching exploits. A married couple with $22,000 in typical annual deductible expenses never reaches $32,200, so without bunching they claim the standard deduction two years in a row: $64,400 total. Push $40,000 of deductible spending into Year 1 and claim the standard deduction in Year 2, and the two-year total rises to $72,200. At a 24% marginal rate, that extra $7,800 in deductions is roughly $1,870 in real federal tax savings from timing alone.
What You Can Actually Shift Between Years
Only some itemized deductions are flexible enough to move. The good bunching candidates are the ones where you control when you pay.
Charitable Contributions
Giving is the most movable deduction because you decide when and how much. Cash contributions to public charities are deductible up to 60% of AGI; appreciated property like stock is capped at 30% of AGI.2Internal Revenue Service. Charitable Contribution Deductions
Starting in 2026, itemizers who claim charitable deductions must first clear a 0.5% AGI floor. At $200,000 AGI, the first $1,000 of giving produces no deduction.3Office of the Law Revision Counsel. 26 USC 170 – Charitable, Etc., Contributions and Gifts This floor actually strengthens the case for bunching. Split $20,000 across two years and you lose $1,000 to the floor each year, $2,000 total. Concentrate the same $20,000 into one year and you lose $1,000 once.
State and Local Taxes
The SALT cap jumped from $10,000 to a base of $40,000 for 2025, adjusted to $40,400 for the 2026 tax year ($20,200 if married filing separately). The cap phases down for higher incomes: once modified AGI exceeds $505,000, the cap drops by 30 cents on each additional dollar of income, but never below $10,000.4Internal Revenue Service. Topic No. 503 – Deductible Taxes
Under the old $10,000 ceiling, SALT was useless for bunching because most homeowners in high-tax states hit the cap no matter what. With $40,400 of room, there’s finally space to pre-pay a January property tax installment in December or add a fourth-quarter state estimated payment, pushing $25,000 or $30,000 of state and local taxes into a single year while staying under the limit.
Medical Expenses
Unreimbursed medical costs are deductible only above 7.5% of AGI.5Internal Revenue Service. Topic No. 502 – Medical and Dental Expenses On $120,000 of income, the first $9,000 produces nothing. That floor makes medical deductions nearly impossible in a normal year, but concentrating elective care in one calendar year, dental work, vision correction, non-urgent procedures, can push you past it.
Home modifications prescribed for a medical condition also count. Ramps, widened doorways, and grab bars are fully deductible when they don’t add value to the home; if they do, you deduct the cost minus the value increase.6Internal Revenue Service. Publication 502 – Medical and Dental Expenses Illness doesn’t follow a tax calendar, but when the timing is up to you, aligning procedures with your itemizing year can be worth thousands.
Mortgage Interest
Mortgage interest is mostly fixed by your amortization schedule. The one lever is making your January payment in December to pull an extra month of interest into the current year. The interest must actually be paid in the year claimed.7Internal Revenue Service. Topic No. 504 – Home Mortgage Points One extra month on a $400,000 loan at 6.5% is about $2,170. Useful at the margin, not decisive.
A Two-Year Example
Consider a married couple with $150,000 AGI, $12,000 in annual mortgage interest, $9,000 in annual SALT, and $8,000 in planned yearly giving. Their typical annual itemized total is $29,000, which is $3,200 short of the $32,200 standard deduction. Without bunching, they take the standard deduction both years: $64,400 total.
With bunching, they give $16,000 to charity in Year 1 (two years of giving at once), pre-pay $2,000 of property taxes, and schedule $3,000 of dental work they’d been postponing. Year 1 itemized total: $12,000 mortgage + $11,000 SALT + $16,000 charity + $3,000 medical above the 7.5% floor = $42,000. After the 0.5% charitable floor of $750, the effective itemized deduction is about $41,250.1Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026
In Year 2, they skip charitable giving, let state tax payments run on their normal schedule, and defer elective care. Their itemized total lands around $21,000, so they claim the $32,200 standard deduction. Two-year total: $41,250 + $32,200 = $73,450. That’s $9,050 more than the no-bunching outcome, or about $2,170 of federal tax saved at a 24% bracket.
Using a Donor-Advised Fund
A donor-advised fund is what makes charitable bunching practical if you don’t actually want the charities you support to receive two years of money in December and nothing the following year. A DAF is a charitable account held at a sponsoring organization, usually a community foundation or the charitable arm of a brokerage.8Internal Revenue Service. Donor-Advised Funds You contribute cash or assets, take the full deduction the year of the contribution, and then recommend grants to specific charities over time.
That separation of the tax event from the grant schedule is the point. Fund three to five years of planned giving in your itemizing year, deduct it all at once, and let the charities receive their usual annual support from the DAF.
Contributing Appreciated Stock
Donating long-held appreciated shares directly to a DAF beats selling and donating cash. You deduct the current market value and avoid capital gains tax on the appreciation entirely. The deduction limit for contributed property is 30% of AGI rather than 60% for cash, but for highly appreciated holdings the capital gains savings typically outweigh the lower cap.2Internal Revenue Service. Charitable Contribution Deductions Stock you bought for $10,000 that’s now worth $30,000 would trigger roughly $3,000 of long-term capital gains tax at a 15% rate if sold. Contributing the shares themselves eliminates that tax and still produces a $30,000 deduction.
If You’re 70½ or Older, Look at QCDs First
Qualified charitable distributions are usually better than bunching for retirees who are charitably inclined. A QCD sends money directly from a traditional IRA to a qualified charity, up to $111,000 per person in 2026, and the amount is excluded from taxable income rather than deducted. That lowers your AGI itself, which can reduce Medicare premium surcharges and the taxable share of Social Security benefits. QCDs can’t be claimed as itemized deductions and don’t interact with bunching, so for eligible retirees the normal play is QCDs for charitable giving and bunching for everything else.
Watch-Outs Before You Commit
Large itemized deductions in one year can pull you into the alternative minimum tax. The AMT recalculates your bill under parallel rules that disallow SALT deductions entirely; state income and property taxes get added back to income for AMT purposes. Charitable contributions and medical expenses above the floor are generally allowed under both systems. For 2026, the AMT exemption is $140,200 for joint filers and $90,100 for single filers. If you’re bunching heavily at a high income, a big SALT acceleration could be partially clawed back, so running the numbers both ways is worth the effort.
The 0.5% charitable floor is also worth watching when you carry contributions forward. If your giving in the itemizing year exceeds the 60% or 30% AGI limits, the excess carries forward for up to five years on a first-in, first-out basis.9Internal Revenue Service. Publication 526 – Charitable Contributions3Office of the Law Revision Counsel. 26 USC 170 – Charitable, Etc., Contributions and Gifts The carryforward is a safety net if you overshoot a DAF contribution, but amounts you deduct in a later year still have to clear that year’s 0.5% AGI floor, so the carryover isn’t completely frictionless. For most households bunching every two or three years, the five-year window is long enough to use the carryforward in full.