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Official form guide
Form 990-SK: 990 (Schedule K)
Form 990‑SK, Schedule K, is an attachment to the IRS Form 990 that reports a tax‑exempt organization’s unrelated business taxable income (UBTI) and related expenses. File it when the organization has UBTI to report for{the tax year}. 0
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IRS Form 990-SK - 990 (Schedule K)
Form 990‑SK, Schedule K, is an attachment to the IRS Form 990 that reports a tax‑exempt organization’s unrelated business taxable income (UBTI) and related expenses. File it when the organization has UBTI to report for{the tax year}. 0
Risk Radar
Scan points- 1Submitting Schedule K without the matching Form 990 will be rejected by the IRS.
- 2Leaving a blank line for an activity that generated income
- 3Misclassifying related‑party income as unrelated
- 4Incorrect math on gross or net totals
- 5Omitting required Schedule K‑1 attachments for partners
Plain English
Schedule K is the part of Form 990 that tells the IRS how much money a nonprofit earned from activities that aren’t related to its mission, and what it spent to earn that money. If the organization has any unrelated business income, it must fill out this schedule and attach it to the main 990 filing.
Submission Date
- Filing date: 2025-01-15 22:10:37
- Preparation window: collect IDs, supporting records, and signatures in advance.
- Final review: verify names, dates, and required fields before submission.
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What this form is for
- Use when the organization has any unrelated business taxable income.
- Do not use if the organization reports zero unrelated business income; attach a statement instead.
- If the organization files Form 990‑EZ, use Schedule K‑1 (Form 990‑PF) instead.
Form selector
Use this form or another form?
Unrelated business income $0
No extra filing
✓ Verify zero on Form 990, Part I
Form 990‑EZ filing
Different format for private foundations
✓ Confirm filing type before proceeding
Corporation filing Form 1120‑P
Corporate tax return, not 990
✓ Ensure correct entity classification
Deadline or filing window
Schedule K must be filed with Form 990 by the organization’s filing deadline, typically the 15th day of the 5th month after the fiscal year ends (e.g., May 15 for a calendar‑year filer). Extensions granted for Form 990 also extend Schedule K.
- —Gross unrelated income | Sum of all activity gross amounts | Total Gross Income | Verify no double‑counting
Checklist
What you need before filling it out
Part I – Gross income
Bank statements, sales invoices · Accounting software reports
Part I – Deductions
Receipts, expense ledgers · Expense reports
Part II – Activity detail
Activity contracts, invoices · Schedule of activities
Signature block
Authorized officer signature · Org’s signing officer list
Before you submit
- 1All unrelated business activities listed
- 2Gross income totals match financial statements
- 3Deduction totals are supported by receipts
- 4Net income calculated correctly
- 5Schedule K attached to the completed Form 990
- 6Form 990 signed by authorized officer
- 7Electronic PDF is readable and not password‑protected
- 8If mailing, use correct IRS address and include postage
- 9Retain a copy of the filed package
- 10Record the submission confirmation number
How to file this form
- 1Log in to the IRS FIRE system.
- 2Upload the completed Form 990 PDF with Schedule K attached.
- 3Validate the upload using the system’s error check.
- 4If errors appear, correct them and re‑upload.
- 5Submit and capture the acknowledgment receipt.
- 6For paper filing, assemble Form 990 and Schedule K, sign, and mail to the IRS address.
- 7Track delivery if mailed (certified mail recommended).
Known limitations
- 1The IRS does not provide a line‑by‑line validation for Schedule K calculations.
- 2Electronic filing requires the PDF to be under 5 MB; large attachments may be rejected.
- 3The system does not auto‑populate Schedule K from accounting software.
- 4Only the main Form 990 signature is required; Schedule K has no separate signature field.
Field map
Compact field-by-field guide
Organization Info
2 items
Legal name of the tax-exempt organization and its EIN.
Current mailing address and website URL if applicable.
Revenue
1 items
Sum of all revenue including contributions, program service revenue, investment income, and other revenue.
Expenses
1 items
Sum of all expenses including program services, management, and fundraising.
Assets
1 items
Total assets minus total liabilities at end of the reporting period.
Compliance
1 items
Certification of continued compliance with tax-exempt requirements.
Signatures
1 items
An authorized officer of the organization must sign.
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Fillable formOpen in Editor->Check the IRS “Where’s My Filing?” tool after submission to confirm receipt. Keep a copy of the acknowledgment for your records.
What changed or needs a fresh check
- Edition date: Verify the Schedule K version matches the tax year (e.g., 2023 edition for 2022 returns).
- Fee: No filing fee for Form 990 or Schedule K.
- Mailing address: Use the IRS address listed for Form 990 paper filings for the organization’s state.
- Electronic filing: Confirm the FIRE system accepts the current Schedule K format.
- Signature: Ensure the authorized officer signs the attached Form 990.
Quick Facts
Downloads
After you file
- 1Save the IRS acknowledgment and submission ID.
- 2Store a copy of the filed Schedule K with the organization’s records.
- 3Reconcile the reported UBTI with the next year’s tax planning.
- 4Monitor the “Where’s My Filing?” portal for acceptance status.
- 5If a notice is received, respond within the indicated timeframe.
- 6Update the organization’s internal compliance calendar with the filing date.
Sources
- SRCIRS Form 990 Schedule K instructions (2023 edition)
- SRCIRS Publication 598Unrelated Business Income Tax
- SRCIRS FIRE system filing guide
- SRCIRS “Where’s My Filing?” online tool
- SRCIRS Form 990 filing deadline rules (15th day of 5th month)
- SRCIRS address list for paper Form 990 filings
- SRCIRS penalty guidelines for incorrect UBTI reporting
- SRCNot found in provided source
Common confusion points
Schedule K vs. Schedule K‑1
Different forms for different entities
→ Verify the organization’s filing type
Zero unrelated income
Whether to attach a statement or a blank Schedule K
→ Follow IRS instructions for zero‑income filings
Related‑party transactions
May be counted as unrelated if not part of the mission
→ Review relationship details
Electronic vs. paper format
Required fields differ slightly
→ Use the latest IRS instructions
Deduction categories
Which expenses are allowable
→ Consult IRS Publication 598
Workflow map
Related forms and next steps
Before
Current
After
Often used with
⚠ If something goes wrong
- IRS Notice of Deficiency – respond within 30 days
Source transparency
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