If you give meaningfully to charity every year and take the standard deduction on your tax return, your charitable giving is generating zero current tax benefit. Most people don’t realize this. Most CPAs don’t bring it up because the fix isn’t a tax-prep matter — it’s a planning matter, made before the year ends.
The fix is bunching.
The math that changed in 2017
Before 2017, the standard deduction was $12,700 for a married couple. Most charitable households itemized. Every dollar of charitable giving above the standard threshold reduced taxable income.
The Tax Cuts and Jobs Act (TCJA) raised the standard deduction to $29,200 for married couples in 2024 (continuing to inflate). A typical charitable household at $20K/year of giving plus $10K of state and local taxes (capped at $10K, so SALT ≤ $10K)plus $5K of mortgage interest now totals ~$35K of itemizable deductions — barely above the standard. The marginal benefit of the next charitable dollar is zero until you push above the standard.
A household giving $20K/year for 5 years, taking the standard deduction every year, gets the same tax outcome as a household that gave $0. The IRS is indifferent.
The bunching fix
Concentrate multiple years of charitable giving into a single tax year. That year, you itemize and clear the standard deduction substantially. The other years, you take the standard deduction.
Same total giving over 5 years. Same charities receive the same money. But the tax benefit goes from zero to meaningful.
A concrete example
Married couple, $200K AGI, $10K SALT (capped), $0 mortgage interest, $20K/year of charitable giving, 24% marginal bracket.
Without bunching (5 years, status quo):
- Each year: itemizable = $30K vs. standard = $29.2K. They itemize at $30K.
- Marginal tax benefit of charity: $30K - $29.2K = $800 of benefit at 24% = $192/year × 5 = $960 over 5 years
With bunching (5 years’ giving in year 1):
- Year 1: $100K to a donor-advised fund. Itemizable = $110K. Tax benefit of itemizing over standard: $110K - $29.2K = $80.8K × 24% = $19,400
- Years 2–5: take standard deduction. No itemized deductions. $0 charity-related tax benefit.
Difference: $19,400 - $960 = ~$18,400 of additional tax savings over 5 years, on the same total amount given.
That’s the rough math. Specific situations vary based on bracket, state, and other deductions, but the direction is consistent: meaningful single-digit-thousand to mid-five-figure savings depending on giving level.
How donor-advised funds enable bunching
The strategy depends on being able to contribute to a charity now and distribute the funds to specific charities later. A check directly to a charity doesn’t allow that — once written, it’s spent.
A donor-advised fund accepts the lump-sum contribution, generates the immediate deduction, and lets you grant out to charities over the following years at your normal pace. This is the workhorse vehicle for bunching.
When bunching doesn’t work
- Already itemizing well above the standard. If your existing itemizable deductions (SALT, mortgage interest, medical) already total $50K+, the marginal benefit of bunching is smaller because you’re already capturing most of the deduction value annually.
- Charitable giving below ~$10K/year. The math gets thin. Bunching 5 years of $5K = $25K is below the $29.2K standard for a couple. Doesn’t help unless paired with other itemizable deductions.
- Giving directly to operating organizations that need the cash flow this year. A DAF deferral may not work if a charity is depending on your annual gift. (Though DAFs can grant immediately too — defer the tax, distribute the grants on the same schedule.)
Combining with appreciated stock
The strategy gets stronger when the bunched contribution is funded with appreciated stock rather than cash. Two compounding benefits:
- The deduction at fair market value
- Avoidance of capital gains tax on the embedded gain
For a $100K stock position with $30K of cost basis given to a DAF, you skip ~$16,700 of federal capital gains tax (23.8% × $70K) and take a $100K deduction — adding another five figures of tax savings on top of the bunching benefit.
Common bunching cycles
- Every other year. Give double in odd years; take standard in even years. Smooth and simple.
- Every 3 years. Bunch three years of giving in year 1; standard in years 2 and 3.
- 5-year load. Front-load 5 years of giving in a high-income year (business sale, large bonus, IPO), then standard for 4 years. Common at liquidity events.
- One-time mega-bunch. A 70-year-old planning lifetime charitable giving might fund a DAF with 10–15 years of giving in a single year — typically before QCDs take over at 70½.
The conversation worth having
Most CPAs file your return based on the activity that already happened. Most don’t proactively model “what if you bunched five years into one?” That’s a financial planning conversation, ideally happening in October or November so there’s time to execute before year-end.
If you give meaningfully and aren’t sure whether bunching applies to your situation, we’ll run the numbers.
General educational information. Specific bunching benefits depend on income, deduction profile, state taxes, and charitable goals. Coordinate with your tax preparer before executing any large-deduction strategy.