Question 1

Is Brett Chamberlin MBR a tax-exempt 501(c)(3)?

Accepted Answer

Yes. Brett Chamberlin MBR is recognised by the IRS as a 501(c)(3) organisation (EIN 88-1151856). The IRS recognised Brett Chamberlin MBR as tax-exempt in May 2022.

Question 2

What is Brett Chamberlin MBR's EIN?

Accepted Answer

Brett Chamberlin MBR's Employer Identification Number (EIN) is 88-1151856. The EIN was assigned by the IRS in May 2022. Donors and grantmakers use the EIN to verify tax-exempt status with the IRS.

Question 3

What does Brett Chamberlin MBR do?

Accepted Answer

OPEN (Organization for Polyamory and Ethical Non-monogamy) is a nonprofit organization dedicated to fostering the polyamory and non-monogamy movement by advancing cultural acceptance, building political power, and supporting non-monogamous communities and leaders.

Question 4

Where is Brett Chamberlin MBR located?

Accepted Answer

Brett Chamberlin MBR is located at 6114 La Salle Ave 327, Oakland, CA, 94611.

Question 5

When was Brett Chamberlin MBR founded or recognised by the IRS?

Accepted Answer

Brett Chamberlin MBR was recognised by the IRS as a tax-exempt organisation in May 2022. The IRS ruling date is the earliest authoritative date available for most US nonprofits.

Question 6

What is Brett Chamberlin MBR's annual revenue?

Accepted Answer

On its most recent Form 990 (fiscal year 2025), Brett Chamberlin MBR reported $246K in total revenue and $243K in total expenses.

Question 7

Has Brett Chamberlin MBR been auto-revoked by the IRS?

Accepted Answer

No. Brett Chamberlin MBR (EIN 88-1151856) 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 Brett Chamberlin MBR listed in IRS Publication 78?

Accepted Answer

Yes. Brett Chamberlin MBR is listed in IRS Publication 78 as an organisation eligible to receive tax-deductible charitable contributions. Pub 78 status is the canonical IRS signal that donations to an org are deductible.

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Organization for Polyamory and Ethical Nonmonogamy

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