References & Official Sources

Official IRS summary of OBBBA provisions signed July 4, 2025 (Public Law 119-21). Covers estate tax exclusion increases: $13,990,000 for 2025 decedents, $15,000,000 for 2026 decedents. Includes standard deduction increases, marginal rate tables, and AMT exemption amounts.

Official IRS revenue procedure announcing 2026 tax year inflation adjustments under OBBBA. Top marginal rate remains 37% for income over $640,600 (single) or $768,700 (married filing jointly). Standard deduction: $32,200 (married), $16,100 (single).

Official IRS page listing current federal income tax rates and brackets for all filing statuses. 2025 top rate: 37% for income over $626,350 (single) or $751,600 (married filing jointly).

Official IRS guidance on the excise tax imposed on the net investment income of private foundations under IRC Section 4940. Current rate: 1.39% (reduced from 2% by the Taxpayer First Act, effective December 20, 2019).

Official IRS publication covering all rules for charitable contribution deductions. Includes the 30% AGI limit for cash contributions to private foundations and the 20% AGI limit for contributions of appreciated capital gain property (IRC §170(b)(1)(D)).

Official IRS landing page for private foundations. Covers IRC §501(c)(3) tax-exempt status, Form 990-PF filing requirements, excise taxes under IRC §4940–§4945, and the distinction between private foundations and public charities.

Official IRS guidance on the 5% minimum distribution requirement for private foundations under IRC §4942. Foundations must distribute at least 5% of the fair market value of their non-charitable use assets each year.

Official IRS guidance on prohibited self-dealing transactions between private foundations and disqualified persons under IRC §4941. Includes exceptions for reasonable compensation paid to family members for legitimate services.

Official IRS announcement of 2025 inflation adjustments. Annual gift tax exclusion: $19,000 per recipient (2025). Lifetime estate and gift tax exemption: $13,990,000 per individual (2025).

Official IRS Q&A on the 3.8% Net Investment Income Tax (NIIT) under IRC §1411. Applies to individuals with modified AGI above $200,000 (single) or $250,000 (married filing jointly). Combined with the 20% capital gains rate, creates a 23.8% effective rate on investment income for high earners.

Official IRS page for Form 990-PF, the annual information return required of all private foundations. The 990-PF is a public document — it discloses the foundation's assets, investments, grants, officers, and compensation. This public transparency is a key component of the philanthropic identity strategy.

Official IRS guidance on the Generation-Skipping Transfer (GST) tax. The GST exemption is unified with the estate tax exemption ($13.99 million in 2025, $15 million in 2026 under OBBBA). Assets in a private foundation are not subject to GST tax on distributions to grandchildren or lower generations.

Official IRS topic page on capital gains taxation. Long-term capital gains rates for 2025: 0% (up to $48,350 single / $96,700 married), 15% (up to $533,400 single / $600,050 married), 20% (above those thresholds). Combined with 3.8% NIIT, top effective rate is 23.8%.

Official IRS publication on sales and other dispositions of assets. IRC §1250 unrecaptured depreciation on real property is taxed at a maximum 25% rate. IRC §1245 recapture on personal property is taxed as ordinary income. Both are eliminated when appreciated property is donated to a private foundation before sale.

The Taxpayer First Act (enacted December 20, 2019) replaced the prior two-tier private foundation excise tax (2% / 1%) with a single flat rate of 1.39% on net investment income. This simplification and reduction made private foundations more tax-efficient as investment vehicles.

Official IRS guidance on the excess business holdings rules under IRC §4943. A private foundation and its disqualified persons together may not hold more than 20% of the voting stock of a business enterprise. Key compliance consideration for founders who contribute business interests.

Full text of IRC §4940 establishing the 1.39% excise tax on net investment income of private foundations. Authoritative legal source for the current tax rate applicable to all domestic private foundations.

Full text of IRC §170 governing charitable contribution deductions. Establishes the 30% AGI limit for cash contributions to private foundations (§170(b)(1)(B)) and the 20% AGI limit for appreciated capital gain property (§170(b)(1)(D)).

Full text of IRC §2001 imposing the federal estate tax. Top rate of 40% on taxable estates above the unified credit exemption amount. The OBBBA permanently set the basic exclusion amount at $15,000,000 for 2026, indexed for inflation.

Full text of IRC §501(c)(3) establishing tax-exempt status for charitable organizations including private foundations. Defines the organizational and operational requirements for maintaining exempt status.

Full text of IRC §1014 establishing the stepped-up basis rule. Heirs who inherit appreciated property receive a cost basis equal to the fair market value at date of death, eliminating embedded capital gains. Assets donated to a private foundation before death do not receive this step-up.

Full text of the One Big Beautiful Bill Act as signed into law on July 4, 2025. Permanently extends and modifies TCJA provisions including estate tax exemption, income tax brackets, standard deduction, SALT cap ($40,000 for joint filers), and AMT exemption.

The original 2017 legislation that temporarily doubled the estate tax exemption and reduced income tax rates. The OBBBA (2025) made these changes permanent, preventing the scheduled 2026 sunset that would have reduced the estate exemption to approximately $7 million per person.

Treasury regulations implementing IRC §170 charitable contribution rules. Governs the deductibility of contributions to private foundations, including the substantiation requirements and the distinction between operating and non-operating foundations.

Comprehensive overview of US private foundations with citations to IRS regulations, IRC sections, and academic research. Covers history, legal requirements, tax treatment, types of foundations, and the distinction between private foundations and donor-advised funds.

Authoritative nonpartisan analysis of 2026 federal income tax brackets under OBBBA. Includes capital gains tax brackets: 0% up to $49,450 (single) / $98,900 (married); 15% up to $545,500 / $613,700; 20% above those thresholds. Plus 3.8% NIIT for high earners.

Professional analysis of estate and gift tax planning implications under the OBBBA for 2026. Confirms $15M per-person exemption ($30M for couples), permanent indexing for inflation, and strategic planning considerations for high-net-worth families.

Comprehensive state-by-state income tax rate data for 2025. Top state rates range from 0% (Texas, Florida, Nevada) to 13.3% (California). State taxes on capital gains and income are generally eliminated on assets contributed to a private foundation, as the foundation is a federal tax-exempt entity.

Forbes Business Council article by Sid Prddinti on the strategic and philanthropic benefits of private foundations for business owners and entrepreneurs. Covers the transformation from business owner to purpose-driven philanthropist, the tax advantages, and the legacy-building potential of foundation structures.

Service overview for the Mini Family Office approach to integrated wealth management. Covers six service areas: Estate & Tax Law Evaluation, Entity Structure & Asset Mapping, Asset Alignment & Protection, Tax Strategy & Compliance, Philanthropy & Foundation Strategy, and Advisor Coordination.