Question 1

Is 509 Seiu Union a tax-exempt 501(c)(3)?

Accepted Answer

Yes — 509 Seiu Union is recognised by the IRS as a 501(c)(5) organisation (EIN 04-6190454). The IRS recognised 509 Seiu Union as tax-exempt in November 1943.

Question 2

What is 509 Seiu Union's EIN?

Accepted Answer

509 Seiu Union's Employer Identification Number (EIN) is 04-6190454. The EIN was assigned by the IRS in November 1943. Donors and grantmakers use the EIN to verify tax-exempt status with the IRS.

Question 3

What does 509 Seiu Union do?

Accepted Answer

Labor Union representing, servicing and organizing members

Question 4

Where is 509 Seiu Union located?

Accepted Answer

509 Seiu Union is located at 293 Boston Post Road West 4th Floo, Marlborough, MA, 01752.

Question 5

When was 509 Seiu Union founded or recognised by the IRS?

Accepted Answer

509 Seiu Union was recognised by the IRS as a tax-exempt organisation in November 1943. The IRS ruling date is the earliest authoritative date available for most US nonprofits.

Question 6

What is 509 Seiu Union's annual revenue?

Accepted Answer

On its most recent Form 990 (fiscal year 2024), 509 Seiu Union reported $18.5M in total revenue and $16.2M in total expenses.

Question 7

Has 509 Seiu Union been auto-revoked by the IRS?

Accepted Answer

No — 509 Seiu Union (EIN 04-6190454) does not appear on the IRS Auto-Revocation List. Givalgo Discover cross-references the IRS Auto-Revocation List on every profile load; if status changes, this page reflects it.

Question 8

Is 509 Seiu Union listed in IRS Publication 78?

Accepted Answer

Givalgo Discover did not find 509 Seiu Union in the most recent IRS Publication 78 download. Some tax-exempt organisations (e.g., churches and government instrumentalities) are eligible to receive deductible contributions without appearing in Pub 78 — verify directly with the IRS if uncertain.

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509 Seiu Union

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