The "no activity" exception. Treas. Reg. §1.6031(a)-1(a)(3)(i) provides that a partnership that has no income, deductions, or credits for federal income tax purposes for a taxable year is not required to file a partnership return for that year. This exception is self-executing — no election is filed, and no notice is given to the Service. The partnership simply does not file for the year in question. The threshold is strict and literal. The exception requires a complete absence of income, deductions, and credits — not "de minimis" activity. Any of the following would, on its face, defeat the exception and trigger a filing obligation under §6031(a): Interest credited on an operating bank account Amortization of §195 start-up expenditures or §709 organizational expenditures already placed in service Any §162 ordinary and necessary business expense, or §212 expense for property held for the production of income Guaranteed payments under §707(c) State franchise or LLC taxes that are deductible at the federal level Pass-through items from any lower-tier partnership or flow-through investment Failure-to-file penalty exposure. If the partnership had any activity and the exception is in fact unavailable, §6698 imposes a per-partner, per-month penalty (indexed annually for inflation) for up to 12 months. Small partnerships (10 or fewer partners, each of whom is a natural person — other than a nonresident alien — or an estate of a deceased partner, with items allocated in the same proportion as every other item) have historically been able to obtain penalty relief under the reasonable-cause safe harbor of Rev. Proc. 84-35, provided each partner timely reported their share on their individual return. That relief continues to be administered by the Service, though it requires affirmative invocation and documentation and should not be treated as a substitute for a considered filing decision. State considerations. The federal exception does not control at the state level. Many states (including California, New York, and Texas for franchise/margin tax purposes) require an annual filing or minimum tax regardless of activity. A federal-only analysis is incomplete for most partnerships.