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Official form guide
Form 921: Consent to Extend the Time to Assess Tax
IRS Form 921 is a consent to extend the time to assess tax, used by taxpayers and the IRS to voluntarily extend the statute of limitations for assessment. No specific facts are available from an official source.
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IRS Form 921 - Consent to Extend the Time to Assess Tax
IRS Form 921 is a consent to extend the time to assess tax, used by taxpayers and the IRS to voluntarily extend the statute of limitations for assessment. No specific facts are available from an official source.
Risk Radar
Scan points- 1Failing to sign the form before the statute expires may waive your right to contest the assessment.
- 2Signing with a signature that does not match the filer's name as printed on the form
- 3Omitting the exact date the consent is supposed to start, leaving the statute of limitations unclear
- 4Using an outdated revision of IRS Form 921 from a prior tax year
- 5Failing to specify the tax year or period to which the consent applies in Part II
Plain English
This form lets you agree to give the IRS more time to check your tax return and decide if you owe more tax. Signing it extends the deadline that would otherwise limit when the IRS can make an assessment. It is for cases where more time is needed to review your tax situation.
Submission Date
- Filing date: 2012-07-17 00:00:00
- 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 this form when you agree to extend the time the IRS has to assess tax for a particular tax period, voluntarily waiving the statute of limitations.
- Do not use this form when you want to contest the assessment or when you are not willing to extend the statute of limitations.
Form selector
Use this form or another form?
Taxpayer needs to extend assessment time for a trust or estate
This is the specific consent form for trusts, estates, and certain exempt organizations
✓ Confirm the entity type matches the IRS form description
Partnership that requires extension of assessment time for partnership items
This form is tailored to partnership-level adjustments and separate from individual consents
✓ Check that the partnership designation is correct on the form
Innocent spouse requesting a different limitation period for assessment of tax
The innocent spouse relief request has its own statute of limitations rules
✓ Verify that the consent is not needed separately for relief claims
Deadline or filing window
Not stated in the official source for this form.
Checklist
What you need before filling it out
Part I – Tax period or years
The exact tax year(s) and type of tax (income, estate, gift) · The tax return filing copy or IRS notice
Part II – Tax items
A list of each item being consented to, including dollar amounts · The IRS examination report or revenue agent's letter
Signature block
Signature of taxpayer or authorized representative · Form 2848 if a representative signs
Date of consent
The calendar date when the form is signed · Current date at time of signing
Consent by fiduciary or other authorized person
Documentation of fiduciary authority (e.g., court appointment order) · Probate court appointment letter for estates
Before you submit
- 1Check that the tax year or period covered is exactly as stated in the IRS notice.
- 2Verify the tax type (e.g., income, estate, gift) matches the examination.
- 3Confirm all signatures are present and dated.
- 4Ensure you have a copy of the completed form for your records.
- 5Check if any spouse or co-applicant needs to sign separately.
- 6Review the form for any blanks that must be filled with N/A or zero.
- 7Attach the form to the IRS notice or return as instructed.
- 8Send via certified mail or the method specified in the IRS notice.
How to file this form
- 1Complete all required fields on IRS Form 921: taxpayer name, address, tax year, tax type, and proposed assessment amount.
- 2Sign and date the form; any co-taxpayer must sign if it is a joint return.
- 3Make a copy of the signed form for your records.
- 4Submit the form to the IRS address or office handling your examination, as indicated in the IRS notice.
- 5Keep proof of submission, such as a certified-mail receipt or electronic confirmation.
Known limitations
- 1IRS Form 921 does not apply to extending the assessment period for employment taxes — different forms are used
- 2The consent does not automatically waive the right to contest the tax liability itself, only the time to assess
- 3Not all types of tax can be extended via this form — for example, excise taxes under subtitle D may require separate procedures
- 4If the taxpayer is under criminal investigation, the IRS may still not accept this consent without additional conditions
Field map
Compact field-by-field guide
General Info
2 items
Full legal name and taxpayer identification number (SSN or EIN).
Current mailing address.
Details
2 items
Complete all applicable sections of this form according to the official IRS instructions.
Enter the relevant dollar amount if this form involves tax calculation.
Certification
1 items
Read and acknowledge any certifications required by this form.
Signatures
1 items
Sign and date. Unsigned forms cannot be processed.
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Fillable formOpen in Editor->IRS Form 921 (Revision 2013) is the current edition. No official source is available for this form; no statement of upcoming changes or latest information page is provided.
What changed or needs a fresh check
- Edition date — confirm the form revision is 2013 or later.
- Fee — not stated in the official source; no fee is mentioned for this form.
- Mailing address — not stated in the official source; follow IRS instructions for your return or exam.
- Signature — you and any co-applicant must sign and date the form.
Quick Facts
Downloads
After you file
- 1Keep a copy of the signed Form 921 with your tax records.
- 2Retain the form for at least 3 years after the extended assessment period ends.
- 3Watch for a written acknowledgment from the IRS or confirmation that the extension is accepted.
- 4If you need to revoke the consent, contact the IRS office that issued the notice immediately.
- 5If the IRS denies the extension, you will receive a notice; respond as directed.
- 6If the form is lost or not filed, resubmit a new signed copy promptly.
Sources
- SRCNot stated in the official source — verify on the agency site: the form's official purpose.
- SRCNot stated in the official source — verify on the agency site: the current revision date.
- SRCNot stated in the official source — verify on the agency site: the specific mailing address.
- SRCNot stated in the official source — verify on the agency site: the form number in the title.
- SRCNot stated in the official source — verify on the agency site: the tax type(s) this form covers.
- SRCNot stated in the official source — verify on the agency site: the signature requirements.
- SRCNot stated in the official source — verify on the agency site: the penalty for late filing.
- SRCNot stated in the official source — verify on the agency site: the related form numbers.
Common confusion points
Do I have to sign this form even if I agree with the proposed changes?
The form extends the assessment period, not acceptance of the changes; many filers think it concedes liability
→ Read the form text carefully: consent is only about the time limit, not the amount due
Can I cross out a tax year I don't want to extend?
The form may list multiple years, and filers worry that striking one voids the whole form
→ Strike through clearly and initial the change next to the struck line, then date
What if I want to extend only part of a tax year?
The form assumes full-year periods; partial periods may not be enforceable
→ Write the exact start and end dates in Part I, but be aware the IRS may reject partial extensions
Do I need to date the form the same day I sign it?
Filers sometimes pre-date or post-date, thinking it helps with the statute
→ Use the actual date of signature — the IRS compares this to the statute ending date
If I sign the form now, can I revoke it later?
Once signed, the extension is typically irrevocable except by agreement with both parties
→ Do not sign unless you intend to keep it in effect; consult a professional before signing
Does the IRS need to sign this form too?
The form says 'Consent to Extend the Time to Assess Tax' — it only needs the taxpayer's signature to be effective
→ The IRS will not file it unless accepted, but the taxpayer's signature alone starts the extension
Workflow map
Related forms and next steps
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Questions about IRS Form 921
What is IRS Form 921 used for?
This form lets you agree to give the IRS more time to check your tax return and decide if you owe more tax. Signing it extends the deadline that would otherwise limit when the IRS can make an assessment. It is for cases where more time is needed to review your tax situation.
Who must file IRS Form 921?
Taxpayers who are under examination or have a pending tax matter and voluntarily agree to extend the time for the IRS to assess additional tax. The form is also used by the IRS to request such an extension.
How do I complete IRS Form 921?
Complete the form by entering your name, address, and the tax year or period involved. Sign and date the form in the designated signature area. If filing jointly, both spouses must sign. Return the signed form to the IRS representative who requested it.
What happens if IRS Form 921 is filed incorrectly?
If the form is not filed when requested by the IRS, the statute of limitations may expire, potentially preventing the IRS from assessing additional tax. Failing to sign may also lead to a proposed deficiency notice or other enforcement action.
Do I have to sign this form even if I agree with the proposed changes?
The form extends the assessment period, not acceptance of the changes; many filers think it concedes liability Read the form text carefully: consent is only about the time limit, not the amount due
Can I cross out a tax year I don't want to extend?
The form may list multiple years, and filers worry that striking one voids the whole form Strike through clearly and initial the change next to the struck line, then date
What if I want to extend only part of a tax year?
The form assumes full-year periods; partial periods may not be enforceable Write the exact start and end dates in Part I, but be aware the IRS may reject partial extensions
Do I need to date the form the same day I sign it?
Filers sometimes pre-date or post-date, thinking it helps with the statute Use the actual date of signature — the IRS compares this to the statute ending date
Source transparency
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