The OBBBA’s New Corporate Charitable Donation Floor

Buried in the OBBBA’s corporate tax changes is a deceptively small modification that may reshape corporate philanthropy: Congress may have placed a tax on corporate charitable giving. Beginning in tax years after December 31, 2025, corporations may deduct charitable contributions only to the extent they exceed 1% of taxable income, while the familiar 10% ceiling remains unchanged. The result is that some portion of corporate giving will now generate no tax benefit at all—a shift that alters long-settled expectations about how the tax law treats corporate generosity.

Historically, the distinction between a charitable contribution under IRC §170 and a business expense under IRC §162 often mattered little in practice. Both categories generally produced favorable tax outcomes, and classification disputes were comparatively low stakes. The new 1% floor changes things. Because §162 expenses remain fully deductible, corporations now have a materially stronger incentive to characterize payments to nonprofits as advertising, promotional, or goodwill expenditures rather than charitable gifts. 

This shift matters for nonprofit law in at least two ways.

First, the reform may accelerate the already-blurring boundary between philanthropy and commercial strategy. Payments tied to brand visibility, customer engagement, or industry promotion are increasingly likely to migrate toward §162 treatment, supported by documentation emphasizing expected business return. Corporate giving, in other words, may become less about donative intent and more about demonstrable economic alignment.

Second—and more obtrusively—the rule may redistribute corporate philanthropy within the nonprofit sector. Organizations capable of offering measurable marketing or industry benefits will be advantaged, while smaller charities or those providing diffuse public goods may struggle to compete for corporate dollars that no longer generate deductible value below the floor.

The deeper implication is doctrinal as much as practical. For decades, the corporate charitable deduction has functioned not only as a subsidy but also as a signaling device—marking a category of transfers understood as socially oriented rather than profit-seeking. By making deductibility contingent on surpassing a floor while leaving §162 untouched, Congress may have unintentionally encouraged corporations to reframe giving in explicitly commercial terms. If firms increasingly route nonprofit payments through business-expense characterization, the charitable deduction risks becoming relevant primarily to transfers that lack measurable business justification, which may be the very category least attractive to corporate firms.

This change raises a provocative question. And that question is not whether corporate philanthropy will decline (it might). The question is whether tax law is quietly redefining philanthropy as a form of market behavior—and, if so, whether the conceptual boundary between charity and commerce can remain coherent within §170 at all.