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Exempt Organizations Technical Guide›TG 57: Taxes on Net Investment Income – IRC Section 4940›Table of Contents

A.3. Base Period

0824 Publ 5580 (PDF) · 2026-10-03 edition · updated 2026-10-04 · United States

(1) The base period for any taxable year generally consists of the five taxable years

preceding such taxable year. If an organization hasn’t been a private foundation for five years, its base period consists of the taxable years during which the foundation has existed.

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0824 Publ 5580 (PDF)

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