Bunching tax deductions is a timing strategy: you push two or more years of deductible spending into a single tax year so your itemized total clears the standard deduction by a wide margin, then take 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 many households with normal levels of giving, state taxes, and mortgage interest never quite reach those numbers in a typical year.1Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026 Bunching moves you off that line in the years you plan for it.
Consider a married couple with $22,000 in annual deductible expenses. Year after year, they fall short of $32,200 and claim the standard deduction, adding up to $64,400 over two years. If they instead concentrate $40,000 of deductible spending into Year 1 and take the standard deduction in Year 2, their two-year total becomes $72,200. That’s $7,800 in extra deductions, worth roughly $1,870 at a 24% marginal rate. Same expenses, better timing.
Why the Standard Deduction Sets the Rules
You claim either the standard deduction or your itemized total, whichever is larger. If your itemized expenses fall short, every deductible dollar you spent that year produces no federal tax benefit. You’d owe the same tax if you had given nothing to charity and paid no state taxes at all.
The One Big Beautiful Bill Act, signed in July 2025, made the elevated standard deduction permanent.2Legal Information Institute. Tax Cuts and Jobs Act of 2017 The gap between typical itemized expenses and that threshold is a structural feature of the code now, not a temporary one, which is what makes bunching worth building into your planning.
Which Expenses Are Worth Bunching
Not every deduction is flexible. Bunching works on expenses where you control when the money leaves your account.
Charitable Contributions
Cash gifts are the most flexible piece because you decide the timing. Cash contributions to public charities are deductible up to 60% of AGI; donations of appreciated property are limited to 30% of AGI.3Internal Revenue Service. Charitable Contribution Deductions
Starting in 2026, itemizers claiming charitable deductions must first clear a 0.5% AGI floor. At $200,000 of AGI, the first $1,000 of contributions produces no deduction.4Office of the Law Revision Counsel. 26 USC 170 – Charitable, Etc., Contributions and Gifts The floor actually strengthens the case for bunching. Spread $20,000 in giving 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 changed dramatically for 2026. The old $10,000 ceiling rose to a base of $40,000, adjusted for inflation to $40,400 for the 2026 tax year. Married filing separately is capped at $20,200. The cap phases down once modified AGI exceeds $505,000, reducing by 30 cents per dollar above that threshold but never dropping below $10,000.5Internal Revenue Service. Topic No. 503 – Deductible Taxes
Under the old $10,000 cap, SALT was mostly useless for bunching because homeowners in high-tax states hit the ceiling regardless of timing. With a $40,400 room, you can pre-pay January’s property tax installment in December, add a fourth-quarter estimated state payment, and push $30,000 or more of SALT into the itemizing year while staying within the cap.
Medical Expenses
Unreimbursed medical costs are deductible only above 7.5% of AGI.6Internal Revenue Service. Topic No. 502 – Medical and Dental Expenses On $120,000 of income, the first $9,000 produces nothing. Bunching non-urgent care into one calendar year — dental work, vision correction, elective procedures you were already planning — is often the only way to clear that floor.
Health problems don’t wait for a tax calendar, so this category is the hardest to control. When the scheduling really is up to you, aligning it with your itemizing year can be worth thousands.
Mortgage Interest
Interest on up to $750,000 of mortgage debt is deductible, a limit the new law made permanent. The payment schedule is fixed, but you can pay your January installment in December to pull one extra month of interest into the current year. The interest has to actually be paid in the year you claim it.7Internal Revenue Service. Topic No. 504 – Home Mortgage Points On a $400,000 mortgage at 6.5%, that’s about $2,170 of additional interest. Useful at the margin, not decisive.
Running the Two-Year Cycle
The discipline is straightforward: load up in Year 1, pull back in Year 2.
In the itemizing year, make two years of charitable contributions in one 12-month window. Pre-pay property taxes if you have room under the SALT cap. Schedule and pay for elective medical or dental work. Pay January’s mortgage installment in December. The goal is to exceed the standard deduction by as much as possible, because every dollar above $32,200 for joint filers is a dollar you would otherwise have lost.
In the off year, do the opposite. Skip new charitable contributions, or make grants from your donor-advised fund (you already took that deduction). Let SALT payments follow their normal schedule. Postpone elective procedures. Your itemized total will land well below the standard deduction, which is the point. You claim the standard deduction and nothing is wasted.
A Worked Example
A married couple with $150,000 in AGI has $12,000 in annual mortgage interest, $9,000 in annual SALT, and plans to give $8,000 to charity each year. Their typical itemized total is $29,000, which falls $3,200 short of the $32,200 standard deduction. Without bunching, they claim the standard deduction both years for $64,400 total.
With bunching, they contribute $16,000 to charity in Year 1, pre-pay $2,000 in property taxes, and schedule $3,000 in dental work they had 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. Subtract the 0.5% charitable floor ($750), and the effective deduction is roughly $41,250.1Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026 In Year 2, they make no accelerated payments and take the $32,200 standard deduction. Two-year total: $73,450, about $9,050 more in deductions than without bunching, saving roughly $2,170 in federal tax at a 24% bracket.
Donor-Advised Funds Make Charitable Bunching Practical
A donor-advised fund is a dedicated charitable account run by a sponsoring organization, usually a community foundation or the charitable arm of a brokerage firm.8Internal Revenue Service. Donor-Advised Funds You contribute cash or assets, take the full deduction in that year, and recommend grants to specific charities over time.
The point of a DAF for bunching is that it separates the tax event from the giving. You can front-load three to five years of planned contributions into the DAF in your itemizing year, deduct the whole amount then, and pay the money out to charities on any schedule you want. The charities you support see a steady stream even though your deduction is concentrated.
Contributing Appreciated Stock
Contributing stock or fund shares that have gained value, rather than selling them and donating cash, produces two benefits at once. You deduct the full current market value and you never pay capital gains tax on the appreciation. The deduction limit for contributed property is 30% of AGI instead of 60% for cash, but for highly appreciated assets the capital gains savings usually more than compensate.3Internal Revenue Service. Charitable Contribution Deductions
Say you bought $10,000 in stock now worth $30,000. Selling first would trigger roughly $3,000 in long-term capital gains tax at a 15% rate. Contributing the shares directly to a DAF eliminates that $3,000 while giving you a $30,000 deduction.
Watch Points and Boundaries
The Alternative Minimum Tax
Large itemized deductions can pull you into the AMT, a parallel calculation that disallows SALT entirely. State income taxes and property taxes get added back for the AMT computation. Charitable contributions and medical expenses above the floor are allowed under both systems. If you’re bunching a big SALT payment in a high-income year, run the calculation both ways; part of what you expected to save can be clawed back.
Excess Charitable Contributions Carry Forward
If your gifts exceed the 60% or 30% AGI limits, the excess isn’t lost. It carries forward for up to five years, deductible in future years to the extent you have room.9Internal Revenue Service. Publication 526 – Charitable Contributions4Office of the Law Revision Counsel. 26 USC 170 – Charitable, Etc., Contributions and Gifts Carried-forward contributions still interact with the 0.5% floor in the year they’re actually deducted, but the five-year window is generous enough that most bunchers use up any excess without losing it.
The Off-Year Universal Charitable Deduction
Beginning in 2026, taxpayers who take the standard deduction can also claim a small above-the-line deduction for cash gifts to operating charities: up to $1,000 single, $2,000 joint. Contributions to donor-advised funds don’t qualify. It’s too small to reshape the bunching plan, but it means a modest gift in the off year still produces a tax benefit.
Retirees Should Look at QCDs First
If you’re 70½ or older with a traditional IRA, a qualified charitable distribution routes money directly from the IRA to a qualified charity — up to $111,000 per person in 2026. The amount is excluded from taxable income rather than deducted, which lowers AGI and can reduce Medicare premium surcharges, the taxable portion of Social Security, and other phase-out thresholds. QCDs are not itemized deductions and can’t be bunched. For charitably inclined retirees, the QCD is usually the first move; bunching handles everything else.