Most advisors know the OBBBA changed the charitable giving landscape. Fewer have mapped exactly how the 2026 provisions hit their clients’ itemized deductions. With tax projection season approaching and clients still focused on their 2025 bills, there’s a narrow window to get ahead of this conversation. The advisors who’ve already done the math will lead it. The ones who haven’t will be explaining why they didn’t.

How does the 0.5% AGI floor change the deduction for clients who itemize?

Starting in 2026, a new 0.5% AGI floor limits charitable itemized deductions for nearly every client who itemizes. Before any of the traditional percentage-of-AGI limits apply, the first 0.5% of a client’s AGI is subtracted from their total qualifying charitable contributions.

For a client reporting $500,000 in AGI, the first $2,500 of charitable contributions is non-deductible. At $1 million AGI, the floor wipes out the first $5,000. This applies before the traditional 60/50/30/20% AGI limits kick in, which means the deduction is smaller than what advisors and clients have been accustomed to.

Why does the floor application order matter?

Here’s the detail that will catch many advisors off guard: the 0.5% floor is applied in the opposite order of how traditional AGI limits work. It hits the 20% category contributions first, then moves up through 30%, 50%, and 60% until the full 0.5% of AGI is reached. Only after the floor is fully applied do the traditional percentage limits apply to what remains.

This matters because contributions in the 20% category (such as certain appreciated property gifts to private foundations) get reduced first, even if a client also made cash gifts that fall into the 60% category. Advisors who model this incorrectly risk presenting clients with a deduction estimate that doesn’t hold up at filing.

What does the 35% cap mean for top-bracket clients?

For taxpayers in the 37% marginal income tax bracket, the tax benefit of charitable itemized deductions is now capped at 35%. Put simply, top-bracket taxpayers lose $2 for every $37 in itemized deductions. In practical terms, a top-bracket client making a $100,000 charitable gift previously received $37,000 in tax benefit. Under the new cap, that same gift yields $35,000. Two cents per dollar may sound small, but it compounds on large gifts and the impact stacks on top of that of the 0.5% floor.

This is an additional provision, not an alternative. Top-bracket clients face both the floor reduction and the cap, which means the effective tax benefit of charitable giving has contracted from two directions simultaneously.

What happens to contributions that exceed the limits?

Amounts excluded under the 0.5% floor aren’t lost. They carry forward for up to five years, following the same rules as traditional AGI-limit carryovers. One important nuance: carryovers from prior years are not added to current-year contributions when calculating the floor exclusion. Advisors building multi-year giving strategies need to factor this compounding effect into their models.

Separately, the limit on Schedule A itemized deductions for top-bracket filers applies to all itemized deductions and excluded amounts do not carry forward. This is a distinct provision from the charitable-specific rules and should not be conflated in client conversations.

Does the new non-itemizer deduction affect DAF strategy?

Beginning in 2026, non-itemizers can deduct up to $1,000 ($2,000 for joint filers) for cash donations to qualifying charities. However, contributions to donor-advised funds (DAFs) are explicitly excluded from this deduction. For advisors whose clients use a bunching strategy to alternate between itemizing and taking the standard deduction, this exclusion changes the calculus. In non-itemizing years, a DAF contribution no longer carries even a partial deduction benefit under this provision. Most advisors working with HNW and UHNW clients view this as a minor footnote, but it’s worth flagging for clients near the itemization threshold.

The 2026 provisions aren’t a reason to stop giving. They’re a reason to plan differently. For advisors, the opportunity is clear: the clients who hear about these changes from their advisor first will trust that advisor more. The ones who find out at filing will wonder why no one told them sooner.