IRS Form 921-P – Consent Fixing Period of Limitation on Assessment of Income and Profits Tax

IRS Form 921-P – Real estate developers using partnerships or limited liability companies (LLCs) taxed as partnerships often encounter complex accounting rules for common improvements like roads, utilities, and amenities in residential or commercial projects. IRS Form 921-P plays a specific historical role in this process by extending the statute of limitations for tax assessments tied to the alternative cost method under the now-obsoleted Revenue Procedure 92-29.

This in-depth guide explains everything about Form 921-P, its purpose, who uses it, how it works, and important updates from Rev. Proc. 2023-9. Whether you’re a tax professional, real estate developer, or partnership tax matters partner (TMP), you’ll find clear, actionable information based on official IRS sources.

What Is IRS Form 921-P?

IRS Form 921-P (Rev. April 2015), titled Consent Fixing Period of Limitation on Assessment of Income and Profits Tax (Partnerships and Limited Liability Companies) – Estimated Future Common Expense Allowance for Real Estate Sales Under Contract, is a two-page consent agreement.

It allows the IRS and a partnership (or LLC) to extend the normal three-year statute of limitations for assessing federal income tax deficiencies. The extension applies only to tax adjustments related to the use of the alternative cost method for estimating future common improvement costs in real estate projects.

• Catalog Number: 32811X
• Revision Date: April 2015 (still the current version as of 2026; posted October 25, 2019)
• Official Download: IRS Form 921-P PDF

The form is specifically for TEFRA partnerships (Tax Equity and Fiscal Responsibility Act of 1982 rules, generally for returns filed before the Bipartisan Budget Act changes took full effect). Non-TEFRA entities or investors use Form 921-I instead.

Purpose of Form 921-P: The Alternative Cost Method Under Rev. Proc. 92-29

Under general tax rules (§ 461(h)), developers cannot include costs of common improvements (e.g., sewers, streets, clubhouses) in the basis of sold units until economic performance occurs (costs are actually incurred).

Rev. Proc. 92-29 (1992) provided a safe-harbor alternative cost method allowing developers to include an allocable share of estimated future common improvement costs in the basis of properties sold under contract. This reduced taxable gain on early sales and better matched economic reality for long-term developments.

As a condition of this tentative IRS allowance:

• The partnership had to consent to extend the assessment period.
• The extension ran until one year after the partnership filed its return for the tax year when the project was expected to be completed (or one year after the due date if filed early, ignoring extensions).

Key limitations:

• The consent applies only to deficiencies from the alternative cost method for the named real estate project.
• It does not waive appeal rights or affect other tax items.
• Special rules apply if the IRS issues a Notice of Final Partnership Administrative Adjustment (FPAA) under old § 6226 (TEFRA).

This consent protected the IRS’s ability to audit and adjust returns years later, once all actual costs were known.

Who Must (or Should) Use IRS Form 921-P?

Use Form 921-P if you are:

• A Tax Matters Partner (TMP) or authorized representative of a partnership/LLC taxed as a partnership.
• Electing the alternative cost method under Rev. Proc. 92-29 for a real estate project with sales under contract.
• Filing for partnership tax years beginning after September 3, 1982 (TEFRA era).

Do not use Form 921-P for:

• Individual taxpayers or S corporations → Use Form 921 or 921-A.
• Post-2017 BBA partnerships (centralized partnership audit regime) → Use Form 921-M in some cases.
• New Alternative Cost Method elections after 2022 → See Rev. Proc. 2023-9 below.

The form requires signatures from the TMP (or authorized person with written partnership authorization) and a delegated IRS official (per Delegation Order 25-2).

How to Complete and Submit Form 921-P (Step-by-Step)?

1. Identify the entity and project: Fill in the partnership/LLC name, address, TIN(s), and describe the specific real estate project.
2. Specify tax years and completion date: List affected tax years and the expected project completion tax year.
3. Tax Matters Partner signs: Include the bankruptcy declaration under penalties of perjury.
4. Attach authorization (if someone other than the TMP signs): Must meet Temporary Reg. § 301.6229(b)-1 requirements (identify partnership, authorized person, years, and signatures of all general partners at the time).
5. IRS signs: An authorized IRS official completes the bottom section.
6. Submit: Return the original and one copy to the IRS as instructed (typically with the request under Rev. Proc. 92-29). Keep a copy for records.

Instructions are printed on the back of the form. Always consult a tax advisor before signing any statute extension.

Important 2026 Update: Rev. Proc. 2023-9 and the New Alternative Cost Method

Rev. Proc. 2023-9 (effective for taxable years beginning after December 31, 2022) obsoletes Rev. Proc. 92-29 entirely. Key improvements:

• No longer requires project-by-project IRS consent or annual statements.
• Applies the Alternative Cost Method on a trade-or-business basis (not per project).
• Eliminates the statute-of-limitations extension requirement — no more Form 921-P, 921-A, or similar consents needed for the new method.
• Simplifies recordkeeping and § 481(a) adjustments via automatic Form 3115 procedures.

Transition for prior 92-29 users:

• Developers with open 92-29 projects must generally switch to the new method or default accrual rules.
• Legacy rules allow limited continuation of old treatment for certain in-progress projects (with § 481 adjustments).
• Existing Form 921-P consents remain binding for the covered years and projects.

For new developments in 2025–2026 and beyond, Form 921-P is generally not required.

Related IRS Forms in the 921 Series

Form	Purpose	Best For	Revision
921	General consent to extend assessment period	Individuals, C corps	Jul 2001
921-A	Similar to 921 but for specific items	Certain cases	Jan 2001
921-I	Alternative cost method (non-TEFRA)	Investors, S corps	Apr 2015
921-P	Alternative cost method (TEFRA partnerships)	Partnerships/LLCs	Apr 2015
921-M	Partnership adjustments under BBA	Post-2017 partnerships	Aug 2021

Benefits, Risks, and Best Practices

Benefits:

• Allows earlier recognition of costs, improving cash flow and financial reporting for developers.
• Provides certainty for long-term projects spanning 5–10+ years.

Risks:

• Extends IRS audit window significantly (potentially 10+ years).
• Requires accurate cost estimates; adjustments flow through to partners.

Best Practices (2026):

• For legacy 92-29 projects: Review existing Form 921-P consents and coordinate with IRS if switching methods.
• For new projects: Adopt the streamlined Alternative Cost Method under Rev. Proc. 2023-9 via automatic accounting method change.
• Maintain robust records of estimates, allocations, and actual costs incurred.
• Consult a CPA or tax attorney experienced in real estate development accounting.

Frequently Asked Questions (FAQs)

Is Form 921-P still required in 2026?
No for new elections. It remains relevant only for open matters or legacy projects under Rev. Proc. 92-29.

Where can I download the latest Form 921-P?
Direct from the IRS: https://www.irs.gov/pub/irs-pdf/f921p.pdf.

Can an authorized person (not the TMP) sign?
Yes, with proper written authorization from all general partners meeting regulatory requirements.

Does signing waive appeal rights?
No — the form explicitly states it does not deprive taxpayers of any appeal rights.

Conclusion: Navigating IRS Form 921-P in Today’s Tax Landscape

While IRS Form 921-P was a critical tool for real estate partnerships using the alternative cost method under the original Rev. Proc. 92-29, the IRS has significantly modernized the rules with Rev. Proc. 2023-9. Most developers will no longer need statute extensions for common improvement costs.

For ongoing legacy projects or questions about prior consents, Form 921-P remains an important document. Always verify the latest guidance on IRS.gov and work with qualified tax professionals to ensure compliance.

Download the form here: IRS Form 921-P PDF

For personalized advice on real estate development accounting methods, contact a tax advisor familiar with §§ 446, 461, and partnership audit rules. This article is for informational purposes only and is not tax or legal advice.

Sources: IRS Form 921-P (Rev. 4-2015), Rev. Proc. 2023-9, IRM 25.6.22, and official IRS publications (current as of February 2026).