Roth Conversion and Charitable Giving: 2026 Timing Strategy

Not tax or legal advice. Roth conversion decisions depend on your full financial picture — current vs. projected future tax rates, RMD exposure, estate goals, and state taxes. Work with a fee-only advisor to model your specific scenarios before converting.

The opportunity: a Roth conversion raises your charitable deduction ceiling

Every dollar you convert from a traditional IRA to a Roth IRA is treated as ordinary income in the year of conversion. Convert $500,000 and your AGI rises by $500,000. Most tax planning treats that income spike as a problem to minimize. Charitable planning can treat it as an opportunity.

The reason: your federal deduction limit for cash gifts to a Donor-Advised Fund is 60% of your AGI.¹ If your normal AGI is $400,000, you can deduct up to $240,000 in cash contributions this year. Add a $600,000 Roth conversion and your AGI becomes $1,000,000 — and your deduction ceiling rises to $600,000. Any planned major gift becomes more deductible against the conversion income than it would be in a normal year.

This is not a reason to convert in order to give, or to give in order to convert. It is a reason to coordinate the timing when you plan to do both. Doing them in the same year is often better than doing them a year apart — but the math depends on your specific AGI, bracket position, and the size of each transaction.

2026 tax framework for conversion + giving years

The charitable deduction AGI limits

Limits per IRC §170(b)(1). Amounts exceeding the AGI limit in the contribution year carry forward up to five years.¹

OBBBA rules: the 0.5% floor and 35% cap

The One Big Beautiful Bill Act (effective January 1, 2026) added two new limits that matter most in high-income years like a large conversion year:

0.5% AGI floor. The first 0.5% of your AGI is disallowed — it reduces your net charitable deduction dollar-for-dollar.² On a $1,000,000 AGI year, the floor is $5,000. On a $400,000 AGI year, it is $2,000. The floor is modest but real, and it applies in every itemizing year regardless of your tax bracket.

35% itemized deduction benefit cap. If your taxable income puts you in the 37% federal bracket — which in 2026 starts at $768,700 for married filing jointly³ — your charitable deduction can only save you tax at a 35% rate, not 37%.² A $200,000 deduction saves $70,000 in federal income tax, not $74,000. The 2% cost is real but generally modest relative to the total tax savings from a large deduction.

Important nuance: whether the 35% cap applies depends on your taxable income after all deductions, not your AGI. A large charitable deduction in the conversion year can pull your taxable income below the $768,700 threshold — in which case the cap may not apply at all, or applies only to the portion of income above the threshold.

Three scenarios: how the math plays out

Scenario A: Large conversion, large gift — fully coordinated

• Ordinary income (wages, dividends): $500,000
• Roth conversion amount: $700,000
• Gross AGI: $1,200,000
• Planned DAF cash contribution: $400,000
• 60% AGI limit: $720,000 — no constraint on the $400,000 gift
• 0.5% floor: $6,000
• Net charitable deduction: $394,000
• Other itemized deductions (SALT at high-income phaseout, mortgage): $22,000
• Total itemized deductions: $416,000
• Taxable income: $1,200,000 − $416,000 = $784,000
• 37% bracket threshold for MFJ: $768,700 → $15,300 is in the 37% bracket
• 35% cap applies only to the deductions allocable to the $15,300 above threshold — roughly $15,300 × 2% = $306 extra tax vs. full 37% benefit
• Federal tax benefit from the DAF gift: approximately $394,000 × 35% = $137,900 (with a small additional amount at 32% for deductions reducing income below the 37% threshold)

Without any charitable deduction, taxable income would have been $1,200,000 − $32,200 (standard deduction) = $1,167,800 — well into the 37% bracket for the full amount. The $394,000 charitable deduction reduces tax by roughly $138,000 while also reducing the portion of income in the 37% bracket to a narrow band.

Scenario B: Same gift, no conversion year

• Ordinary income: $500,000
• No Roth conversion
• AGI: $500,000
• DAF cash gift: $400,000
• 60% AGI limit: $300,000 — the gift exceeds this
• Deductible this year: $300,000 (less 0.5% floor of $2,500 = $297,500 net)
• Carry-forward: $100,000 into next five years
• Taxable income: $500,000 − $297,500 − $22,000 other itemized = $180,500 (well below 37% bracket)
• Tax benefit this year: approximately $297,500 × ~32% blended = ~$95,200
• Plus future carryforward benefit of ~$100,000 × ~32% = ~$32,000 (if fully used)

The comparison: Coordinating the conversion year gives approximately $137,900 in immediate federal tax benefit from the same $400,000 gift — versus $95,200 today + $32,000 later from carryforward, and only if future income is sufficient to absorb the carry. The conversion year generates the full deduction immediately and at a higher blended rate.

Scenario C: Appreciated stock gift in conversion year

• AGI with conversion: $1,200,000
• Gift: $400,000 of appreciated stock (long-term, cost basis $80,000)
• 30% AGI limit for appreciated stock: $360,000
• Amount deductible this year: $360,000 (less 0.5% floor of $6,000 = $354,000 net)
• Capital gains tax avoided: $400,000 × 23.8% (20% LTCG + 3.8% NIIT) = approximately $95,200
• Carry-forward: $40,000 at 30% limit
• Total benefit: ~$354,000 × ~35% rate + $95,200 avoided capital gains + carryforward = well over $200,000 in combined tax benefit

In a conversion year, the appreciated stock gift achieves a full 30% AGI limit deduction on a larger base — plus the permanent capital gains avoidance, which is independent of the conversion and stacks on top. For donors with concentrated positions, funding a DAF with appreciated stock in the conversion year delivers the largest combined benefit of any year.

When to give in the conversion year vs. a different year

What QCDs can and cannot do in a conversion year

For donors age 70½ or older, Qualified Charitable Distributions (QCDs) are a powerful tool — but they interact with Roth conversions differently than a DAF contribution does.

A QCD transfers money directly from your traditional IRA to charity, excluding the distribution from gross income entirely.⁴ It is not an itemized deduction — it reduces your gross income before AGI is calculated. In a Roth conversion year, this distinction matters:

• A QCD reduces gross income but does not offset Roth conversion income. You convert $300,000 from the IRA to Roth (recognized as income), and separately do a $111,000 QCD to your chosen charity. The QCD reduces your gross income by $111,000 — it counts as part of your RMD without being taxable — but it cannot be applied against the $300,000 Roth conversion amount.
• A DAF contribution is an itemized deduction that reduces taxable income. It applies against your full AGI including conversion income. If you give $300,000 to a DAF in the same year you convert $300,000, the deduction (less the 0.5% floor) directly offsets the conversion income in your taxable income calculation.
• The two tools are complementary, not interchangeable. A 70½+ donor converting in a given year might use both: QCDs to satisfy RMDs without income inclusion, and a DAF contribution to offset the Roth conversion income with an itemized deduction. These are separate transactions serving separate purposes.

The carryforward risk in a conversion year

The 5-year carryforward (IRC §170(d)(1)) is valuable when you give more than the AGI limit in a single year. But it creates a risk that can be amplified by large conversion + giving combinations:

• If you give more than 60% of your AGI (for cash) in a conversion year, the excess carries forward to the next five years.
• If your AGI in those subsequent years drops significantly — because you've finished converting and income returns to normal — you may not generate enough income to absorb the carry.
• Any portion not used within five years expires permanently with no tax benefit.

A practical safeguard: if you have a large conversion planned and want to give a large amount, give up to (but not exceeding) 60% of your projected post-conversion AGI in that year. The conversion expands the ceiling; there is no benefit to overfunding a DAF beyond what you can deduct over five years.

If you already have a carryforward from prior years, be especially careful about adding more deductions in a conversion year. Stack the math: existing carryforward + new contribution this year ÷ projected AGI over five years. If the carryforward pool exceeds what you can absorb, delay the new contribution to a later year.

The multi-year conversion and giving roadmap

Most tax-optimal Roth conversion strategies involve converting over multiple years — not all at once — to avoid large spikes into the 37% bracket. A coordinated charitable strategy maps the same time horizon:

1. Identify conversion years. Years where income is higher than usual, tax rates are favorable, or RMD exposure begins. These are the years to front-load charitable contributions into a DAF.
2. Size the gift to the conversion. Target 30-50% of conversion amount as a DAF contribution (cash or appreciated stock) — enough to materially offset conversion income without exceeding the 60% ceiling or creating carryforward risk.
3. Use the DAF for grants in non-conversion years. Once funded, distribute from the DAF to operating charities in subsequent years while taking the standard deduction. Your charitable giving continues on its intended pace; the timing of deductions shifted to the high-income year.
4. Revisit after each conversion tranche. If you convert over three or four years, model the giving and the conversion together each year — don't treat them as independent decisions.

State tax considerations

Federal charitable deductions are the dominant planning variable, but don't neglect state income tax:

• Most states that have an income tax follow federal adjusted gross income or federal taxable income as the starting point. A charitable deduction that reduces federal taxable income usually reduces state taxable income too.
• Nine states have no income tax (TX, FL, WA, NV, WY, SD, AK, TN, NH). For residents of those states, only the federal benefit matters.
• California, New York, and New Jersey do not fully conform to all federal charitable deduction rules. California, for example, has its own treatment for some tax preference items. Verify with a state-specific advisor.
• Roth conversions are taxable at the state level in most states that have income taxes. The combined federal + state deduction value of a charitable gift in a conversion year can significantly exceed the federal-only estimate.

Estate planning intersection

A large Roth conversion strategy is often paired with estate planning goals: Roth assets pass income-tax-free to heirs, while pre-tax IRA assets carry an embedded income tax liability. The OBBBA's permanent $15,000,000 estate and gift tax exemption (per individual)⁵ changes the calculus:

• For estates below $30,000,000 (combined for married couples), federal estate tax is not the primary concern. The Roth conversion decision is driven by income tax rates over time.
• For estates above $30,000,000, charitable bequests (unlimited estate tax deduction under IRC §2055), testamentary CRTs, or naming charity as IRA beneficiary may be more powerful estate planning tools than a Roth conversion. See the charitable bequest planning guide and IRA charitable beneficiary guide.
• Roth conversions and charitable giving are not mutually exclusive with estate planning — but each dollar spent on federal income tax via conversion is a dollar not available for charitable or family transfer. The tradeoff should be modeled explicitly.

Common mistakes

• Converting without modeling the charitable deduction. If you plan to give $300,000 this year anyway, not timing it with a $500,000 conversion costs you 5-7% of the gift's value in lost tax efficiency.
• Funding the DAF in December, completing the conversion in January. Both must occur in the same calendar year. If the conversion closes December 31 and the DAF contribution settles January 2, you've lost a full year of coordination.
• Overlooking the 30% limit for appreciated stock. Donors who fund large DAFs with appreciated stock in a conversion year sometimes hit the 30% ceiling (not 60%) mid-transaction. Know which limit applies before the year ends.
• Assuming the 35% cap always applies. The OBBBA 35% cap only applies when your taxable income (after deductions) exceeds $768,700 MFJ. A large charitable deduction in a conversion year may drop you below that threshold — meaning the cap doesn't apply, and each deduction dollar saves at 37% (or 35/32% depending on bracket position).
• Ignoring AMT exposure. Alternative Minimum Tax can reduce the value of itemized deductions for some high-income filers. The OBBBA raised AMT phaseout thresholds, but large conversions can still trigger AMT for certain filers. Model AMT separately.
• Using the conversion year to over-fund a DAF beyond 5-year absorption capacity. A DAF funded with more than five years of planned giving creates expiration risk if income doesn't support absorbing the carryforward.

Working with an advisor on conversion + giving strategy

A Roth conversion decision involves your full financial picture: current tax bracket vs. projected future bracket, RMD exposure, state taxes, estate goals, and investment returns. Adding a large charitable contribution to the model changes the marginal benefit of the conversion, the effective bracket experienced, and the estate plan outcome. This is not a simple one-variable decision.

A fee-only financial advisor with charitable planning expertise will model both decisions together across a multi-year time horizon — quantifying the tax benefit of coordination versus separation. They have no commission incentive to recommend one vehicle over another.