The whole register
Every entry is one instrument, and what it obliges. This is the complete list.

Plate · the recordEvery organisation on the register files once a year, and the filing stays readable afterwards. The twenty-eight entries below take one instrument each.
Legal Form
Section page →- 501(c)(3)
No campaign intervention at all; lobbying limited; assets locked to a charitable purpose.
- 501(c)(4)
Social welfare as the primary purpose, no donor deduction, and no ceiling on lobbying.
- 501(c)(6)
A common business interest among members, and dues that may be only partly deductible to them.
- Private foundation
An annual payout, excise tax on investment income, and the 990-PF whatever the size.
- Fiscal sponsorship
The sponsor holds the funds and carries the legal responsibility for how they are spent.
- The public support test
Support measured as a fraction over a rolling window and reported on Schedule A.
The Return
Section page →- Form 990
Every filing exempt organisation above the small thresholds, annually and in public.
- Form 990-EZ and 990-N
Small filers, annually. The e-Postcard reports eight data points and nothing else.
- Form 990-PF
Every private foundation, listing each grant paid and its contributors unredacted.
- Schedule O
Narrative answers to everything the boxes on the return cannot hold.
- Public inspection
Producing the return on request, at the organisation’s own office, without delay.
- Where filings are read
Nothing — but each one decides what the record looks like by the time a reader finds it.
- The determination letter
Nothing further, once issued — but everything downstream depends on producing it.
- State registration
Registering, and renewing, in every state where the organisation asks the public for money.
- The annual cycle
The fifteenth day of the fifth month after the year ends, extension or not.
- Automatic revocation
Three consecutive years unfiled, and exemption ends without anyone deciding to end it.
Governance
Section page →- The board
Care, loyalty and obedience — duties held by the board itself, not by the staff it hires.
- Bylaws and quorum
How many people have to be in the room before the organisation can be said to have acted.
- Minutes
A contemporaneous record of what was decided and who was in the room.
- Conflict of interest
Disclosure, recusal and an annual signed statement — and a public answer on Part VI.
- Excess benefit
The individual who received the benefit, not the organisation, pays the excise tax.
- Part VI of the return
Answering, in public, whether each policy exists — not having the policy.
Money
Section page →- Restricted and unrestricted
Spending the gift only as the donor specified, permanently where they said so.
- Grants and contracts
Whatever the document actually obliges, regardless of which word is printed at the top.
- Endowment
Prudent management of the fund, and a spending rule that outlives its authors.
- Functional expense
Placing every dollar spent in one of three columns, and standing behind the method.
- The overhead ratio
Nothing. It is a calculation performed on the return by its readers.
- Unrelated business income
Tax at ordinary rates on income from a trade or business unrelated to the exempt purpose.