We had to unwind filings, reissue deposits, and calm a client who was watching the calendar tick toward quarter end. That was the day I started treating the approval letter like a green light, not a suggestion.
This guide is for you if you manage delivery inside a firm and want zero surprises with Form 2678. You will see exactly what the form does, how to complete it the right way, when authority begins and ends, and how to keep aggregate filings clean with Schedule R. I will also point out common tripwires I see in real reviews, plus a short checklist you can adopt today.
Key Takeaways
- Form 2678 is how you appoint or revoke an IRC section 3504 agent for specific employment tax filings and deposits. The IRS recognizes that authority only after it issues an approval letter that shows the effective date and scope.
- As of November 22, 2025, the current form revision is Rev. 12/2024. Do not use older versions. The PDF itself shows “Rev. December 2024” and OMB No. 1545‑0029.
- Processing generally takes about 30 days from IRS receipt. No agent authority exists before approval. The revocation letter controls the end date.
- Most agents use aggregate filing. When an approved 3504 agent files an aggregate Form 941, they use their EIN and must attach Schedule R. Aggregate FUTA on Form 940 with Schedule R is limited, mainly for approved home care service recipient arrangements.
- Employers and agents share liability while the appointment is in effect. Section 3504 makes that explicit, so build controls and proof of deposits, even if a third party helps the agent.
The IRS green‑lights the appointment on the date printed in the approval letter, not the date you signed, mailed, or e‑filed the form. Treat the letter date as your go‑live.
What Form 2678 Actually Does, And When It Starts
Form 2678 sits on a specific legal foundation. Section 3504 of the Internal Revenue Code and the related regulation allow the IRS to authorize an agent to perform an employer’s employment tax acts. That includes withholding, reporting, and paying FICA, RRTA, and income tax withholding, and, in limited circumstances, FUTA for home care service recipients. The employer remains on the hook along with the agent, which is why internal controls matter.
The form does two things. First, it lets you request approval to appoint an agent for specified returns and deposits. Second, it lets you revoke a past appointment. The IRS will send an approval letter after it accepts the request, and authority starts on the exact date in that letter. If you revoke, the IRS sends a revocation letter, and that date controls when authority ends. Do not act early or assume backdating.
As of today, the current form is the 12/2024 revision. You can confirm that on the IRS page for Form 2678 and on the face of the PDF. Older versions are obsolete and the IRS says not to use them. The live instructions page was last reviewed in December 2024 and continues to control process steps in 2025.
Why This Matters To Your Delivery Team
If you run a CPA or EA firm, growth often stalls on delivery, not demand. Payroll and employment tax handoffs create review loops and deadline risks when roles are fuzzy. Form 2678 helps by clarifying who files, who deposits, and which EIN goes on what. That clarity only holds if you set the scope precisely, calendar the approval date, and use Schedule R correctly on any aggregate filings. In my experience, that is where most rework starts.
- You cut review time when your team can see exactly which returns the agent files and which still sit with you.
- You reduce notices when every aggregate 941 and 940 is paired with the right Schedule R and EIN allocations.
- You protect client trust when you refuse to file as an agent before the letter is in hand, even if the quarter is closing.
Quick Glossary You Can Share With Your Staff
- Section 3504 agent, an IRS‑approved agent that performs employer employment tax acts. Joint liability applies.
- Aggregate filing, a single return filed by an approved agent for multiple clients under the agent’s EIN. Requires Schedule R.
- Schedule R, the allocation schedule that maps aggregate wages, deposits, and liabilities to each client’s EIN on Forms 941 and 940.
- Approval letter, the IRS letter that starts the appointment on its printed date.
- Revocation letter, the IRS letter that ends the appointment on its printed date.
How To Complete Form 2678 The Right Way
Here is the fast, practical path my team follows when we prepare or review a 2678 package. It aligns with the current IRS instructions and avoids the common pitfalls that trigger delays.
Part 1, Why You’re Filing
- Choose one box, appoint or revoke.
- Plan for timing. Authority begins only when the IRS issues the approval letter. If you are revoking, one signature is enough, and the revocation takes effect on the date of the IRS letter.
Tip, build your payroll calendar around the letter, not the mailing date. If quarter end is tight, keep filings under the employer EIN until the green light arrives.
Part 2, Employer or Payer Information
- Match the employer’s legal name and EIN to IRS records, and include the full mailing address.
- On line 5, check only the forms and tax types you want the agent to handle. If you leave boxes unchecked, they stay with the employer.
- If the authority is limited to some employees or payments, select the “SOME” column and keep a clean attachment describing the limits.
- Sign and date Part 2, then send the form to the agent for Part 3.
Important home care note, if you are a home care service recipient and want an agent to handle FUTA, you must also appoint the agent for FICA and income tax withholding. The IRS will reject combinations that do not meet that rule.
Part 3, Agent Information
- Enter the agent’s legal name, EIN, and address exactly as they appear on tax records. If a corporate officer, partner, or tax matters partner signs, they must have authority to bind the agent.
- Check the boxes for the forms the agent will file. If this will involve aggregate filing, be ready to attach Schedule R to each aggregate 941, and, where allowed, to aggregate 940 filings for home care arrangements.
- The agent signs and dates to accept the appointment. If the filing is only a revocation, the agent’s signature is not required.
One‑Page Table You Can Use During Prep
| Item | Who completes | What to verify | Why it matters |
| Part 1 box | Employer or agent | Appoint vs revoke | Drives processing and letter type |
| Employer legal name and EIN | Employer | Exact IRS match | Prevents TIN‑name control delays |
| Scope boxes in line 5 | Employer | Only what the agent will handle | Unchecked items remain with employer |
| Agent legal name and EIN | Agent | Exact IRS match | Avoids approval delays |
| Signature blocks | Employer and agent | Authority and dates | Acceptance is required for appointments |
| Version control | Preparer | Rev. 12/2024 form | Older forms are obsolete |
Sources for the above steps, IRS instructions, the live PDF, and Schedule R rules for aggregate filing.
Effective Dates, Approvals, And Revocations
Think in dates, not assumptions.
- Approval letter date, the start of the agent’s IRS‑recognized authority. The IRS says authorization is effective on the date shown in the letter. Generally, processing takes about 30 days from receipt. Until approval, the agent has no liability to file or deposit.
- Revocation letter date, the end of the agent’s authority. One signature is enough to revoke. After the revocation date, the IRS restricts disclosure for later periods.
Calendar these letters, align deposit schedules, and assign ownership for any quarters that straddle approval or revocation. If a client pays executive bonuses directly while the agent runs payroll for staff, those employer‑paid wages must still be reported under the employer’s EIN. The IRS includes examples like this in its instructions to make the split clear.
Legal Grounding And Shared Liability, What To Know
The joint responsibility theme runs through section 3504 and the IRS guidance. All provisions that apply to the employer also apply to the approved agent. That means penalties, deposits, filings, and the duty to keep records. In practice, you should demand bank proof of deposits, reconcile liabilities to EFTPS, and hold the agent to your close checklist every quarter.
For background and special procedures, keep Revenue Procedure 2013‑39 handy. It outlines how a person becomes a section 3504 agent for employment taxes and includes the narrow conditions that allow an agent to handle FUTA for home care service recipients.
Schedule R, Aggregate Filings, And Keeping EINs Straight
If you are an approved section 3504 agent and you file an aggregate Form 941, you must attach Schedule R every quarter. Schedule R allocates wages, deposits, and liabilities to each client’s EIN. Missing or mismatched allocations are a top cause of notices. Treat this as part of your month‑end close, not an afterthought at quarter end.
For aggregate Form 940, the rule is tighter. Aggregate 940 filing is generally not allowed, except for approved home care service recipient arrangements and for CPEOs. If you are in one of those allowed categories, attach Schedule R to your aggregate 940 as well.
Practical Steps That Keep You Out Of Notice Hell
- Reconcile every Schedule R total to the face of the aggregate return before you e‑file or mail.
- Tie EFTPS deposits to EIN‑level liabilities shown on Schedule R.
- Keep audit‑ready workpapers that show how payroll reports roll forward to Form 941 and 940 by EIN.
- If both the employer and the 3504 agent paid wages to the same person in a quarter, each files Form 941 for the wages it paid and each issues a W‑2 for the wages it paid. The 3504 agent uses its EIN on its filings and W‑2s.
Quick Reference, What Requires Schedule R
| Filing situation | Schedule R required | Notes |
| Section 3504 agent filing aggregate 941 | Yes | Must file Schedule R each quarter |
| CPEO filing aggregate 941 | Yes | Must file electronically in most cases |
| Non‑certified PEO, client claims research credit | Yes | Include client‑by‑client amounts |
| Section 3504 agent filing aggregate 940 | Sometimes | Mainly home care service recipient arrangements |
| Employer filing its own 941, no aggregate | No | Report under employer EIN |
Source rules appear in the instructions for Form 941 and 940, and the IRS Schedule R overview.
Special Rules For Home Care Service Recipient Agents
If you support a home care service recipient, the IRS sets a few unique conditions. The agent can be approved for FUTA only if the appointment also covers FICA and income tax withholding. Approval letters for these appointments are sent to the agent, not to the care recipient. Use the current 12/2024 form and follow the same Where To File guidance.
In my reviews, the most common miss here is checking FUTA without checking FICA and ITW. The IRS rejects the package, and the whole plan slips a month. Avoid that with a simple pre‑submission check.
Where To File And Timing
File Form 2678 at the address shown in the instructions for the employer’s location. The IRS will send letters after it approves or revokes the appointment. Plan on about 30 days from receipt to approval. Do not delegate filings or deposits to the agent before the letter arrives. For revocations, the letter date is the termination point for the agent’s authority and for IRS disclosures for later periods.
If you need a quick confidence check on your broader employment tax process, the current instructions for Forms 941 and 940 include up‑to‑date filing and deposit notes for 2025. Keep those open while you finalize quarter end.
Compliance, Privacy, And Recordkeeping
Section 6109 requires accurate taxpayer identification numbers. Mismatched EIN and name control data is a common cause of processing delays. Section 6103 protects returns and return information, with specific exceptions for disclosures to the Department of Justice, states, treaty partners, and certain federal agencies. Keep that in mind when you write procedures and vendor contracts.
On paperwork burden and OMB numbers, the current Form 2678 shows OMB No. 1545‑0029 on its face. That OMB number also appears in the instructions’ Paperwork Reduction Act notice. If you see references to other OMB numbers from old drafts, update your templates.
Controls That Stand Up In Review
- Proof of deposits, require bank confirmations tied to the EFTPS trace, not only payroll reports.
- Workpaper standard, maintain a standing binder that maps each client’s payroll registers to Form 941 line items and to Schedule R columns.
- EIN discipline, lock name control and EIN into your templates to prevent keystroke errors.
- Scope tracker, keep a simple index of which boxes were checked on each client’s 2678 and the letter dates, then build your closing checklist around that index.
FAQs
What is IRS Form 2678?
Form 2678 is the IRS form you use to appoint or revoke an agent under IRC section 3504 to handle defined employment tax filings and deposits. The IRS recognizes the agent only after it issues an approval letter, and that letter sets the effective date and scope.
How long does approval take, and when does authority start?
The IRS says the processing time frame is generally about 30 days from receipt. Authorization is effective on the date shown in the approval letter, not before. Build your quarter around that date.
Does the agent use its EIN, and do we need Schedule R?
Yes for aggregate filings. An approved 3504 agent uses its own EIN on aggregate 941 filings, and must attach Schedule R to allocate amounts to each client EIN. Aggregate 940 filings are limited and require Schedule R when allowed.
What is the difference between a 2678 agent and a 3504 agent?
They describe the same relationship. “Form 2678” is the appointment mechanism, and “section 3504 agent” is the authority under the Code and regulations.
Is Form 5498 related to Form 2678?
No. Form 5498 reports IRA contribution and valuation information and is filed by custodians, not by employers or employment tax agents. It is not part of the 2678 process.
Common Mistakes That Trigger Notices
- Filing as the agent before the approval letter date.
- Using an outdated form version. As of now, Rev. 12/2024 is current.
- Missing Schedule R on aggregate 941s, or totals that do not tie to the face of the return.
- Checking FUTA for home care recipients without also checking FICA and ITW.
- Name control and EIN mismatches for either the employer or the agent.
A Short, Real‑World Checklist You Can Steal
- Version check, confirm you are using Form 2678 Rev. 12/2024.
- Scope, mark only the boxes you want the agent to handle, and document any “SOME” limits.
- Signatures, employer signs Part 2 for an appointment, the agent signs Part 3 to accept. One signature is enough to revoke.
- Calendar, track the approval letter date and revocation letter date. Build your deposit plan around those dates.
- Aggregate control, attach Schedule R to each aggregate 941, and when allowed on 940. Reconcile totals to the return and EFTPS before filing.
- Records, retain EIN‑level allocation workpapers and bank proof of deposits. Follow section 6103 awareness in your contracts.
Where Accountably Fits
When a firm asks us to help on Form 2678 work, we focus on two things. First, getting the form right so authority starts cleanly on the letter date. Second, building the day‑to‑day discipline that keeps aggregate filings and Schedule R allocations accurate with less partner review. If you want a quick eyes‑on review of your 2678 flow or a seasonal aggregate filing plan, our team can help without changing your systems. We keep it inside your tools and templates, then we document the close so anyone on your team can step in.
Closing Thoughts And Next Steps
Form 2678 is simple on paper, and expensive when rushed. Treat the approval letter like the on switch. Lock down EIN and name control fields. Keep Schedule R as part of your normal close, not a last‑minute add. If you do those three things, you will avoid most notices and you will protect client confidence.
- Download the current Form 2678 and instructions, confirm the 12/2024 revision, and refresh your template.
- Review your client list for who needs an agent appointment in Q1 2026, then backward‑plan 30 days for processing.
- Build a one‑page SOP for Schedule R tie‑outs and EFTPS proof, then test it on your next quarter end.
Light Compliance Note
This article is for informational purposes only. It reflects IRS guidance available as of November 22, 2025, including Form 2678 Rev. 12/2024 and related instructions. Confirm facts against the official IRS pages before you file.