Switching Accountants Mid-Year in the US: A Safe Handover

You can switch accountants at any time, even weeks before an extended deadline, but no IRS or state due date moves because you did. In the first week, list every due date for the next 90 days, have an officer or partner sign Form 8821 or Form 2848 so the new accountant can see the IRS account, and send the old accountant a written records request. A CPA, enrolled agent or attorney must promptly return your records under Circular 230 section 10.28.

A handover is simple when the old firm cooperates and nothing is due soon. It needs professional judgment when an extension or installment may have been missed, when payroll changes mid-quarter, or when the company has a foreign owner, several states or a Canadian project.

What do we do in the first week?

Can we switch accountants mid-year or right before an extension deadline?

Yes. A calendar-year Form 1120 is due April 15 of the following year (the 15th day of the 4th month), or October 15 after an extension. Form 1065 and Form 1120-S are due March 15, or September 15 after an extension. The new accountant works to those dates.

Form 7004 must be filed by the return's original due date. "No signature is required" on it (Form 7004 instructions), so the new accountant can file it if the old one has not. Form 7004 extends the time to file, not to pay. Interest runs from the original due date. A corporation avoids the late-payment penalty if it paid at least 90% of its tax by the original date and pays the rest by the extended date.

Missing a date with no extension costs money: a C corporation owes 5% of unpaid tax a month, up to 25%; a partnership owes $260 per partner, and an S corporation $260 per shareholder, per month for up to 12 months, for returns due in 2027 (slightly less for earlier returns). Relief requests are covered in late filing and payment penalties.

Did our accountant file the extension, and what was paid?

Ask the old firm for the IRS e-file acceptance acknowledgment for each Form 7004 and each return. The IRS no longer sends a letter approving an extension; it writes only if it disallows one. If there is no acknowledgment and the due date has not passed, have Form 7004 filed now. If the due date has passed, file the return as soon as possible; penalties and relief are covered in late filing and payment penalties.

Then check the account yourself:

• Business Tax Account shows the balance, payment history, transcripts and IRS notices (Business Tax Account). For a C corporation or S corporation, the Designated Official must be an officer or managing member, a current employee who received a W-2 for the most recent tax filing year, and able to bind the company. A founder abroad who draws no W-2 pay cannot register; a US officer on payroll can. For a partnership, a general partner or a managing partner of the LLC registers.
• EFTPS, enrolled with the company's own PIN, shows 15 months of payment history. Enrollment can take up to five business days (EFTPS).
• Transcripts. With a Form 8821 or Form 2848 on file, a CPA, enrolled agent, attorney or authorized e-file provider pulls account transcripts and records of account through the Transcript Delivery System. Form 4506-T is the paper route.

Form 8821 or Form 2848: which does the new accountant need?

Form 8821 lets someone see your tax information; Form 2848 lets a CPA, enrolled agent or attorney act for you. A new accountant who will deal with the IRS for you needs Form 2848.

Sources: Form 8821 instructions, Form 2848 instructions.

Both forms can be uploaded at IRS.gov/Submit2848 or Submit8821. A form with an electronic signature can only be submitted there; otherwise, mail or fax it with a handwritten signature. Tax Pro Account does not take business authorizations (Tax Pro Account).

Two traps:

• Adding acts on line 5a, other than the listed standard ones, or limiting acts on line 5b makes a Form 2848 "modified", and the representative then cannot pull transcripts through TDS (items to consider).
• Each entity signs its own forms: a parent and its subsidiary, or a GPU cloud and its hosting LLC. List Forms 941 and 940 too when the new firm handles payroll matters.

A partnership's partnership representative, the person who deals with the IRS in an audit, is named on each year's Form 1065 and does not change when you switch accountants. If the old accountant was named, choose again on the next return (Form 8979 instructions).

How do we remove the old accountant's IRS access?

A new Form 2848 replaces the old firm's 2848 for the same matters, but it will not revoke any Form 8821. A new Form 8821 revokes earlier 8821s unless you keep them. To revoke without naming anyone new, write "REVOKE" across the top of a copy of the old form, sign and date it again, and mail or fax it. Without a copy, send a signed statement listing the matters, periods and names, or "revoke all years/periods".

The "Yes" box on the last return lets the individual preparer who signed it discuss that return's processing until next year's original due date. The Form 1065 instructions say that authorization cannot be revoked; for Form 1120, see IRS Publication 947.

If the old firm's address is your IRS address of record, file Form 8822-B. The IRS "strongly suggests" not using a provider's address (outsourcing payroll duties). Also remove the old firm's users from your accounting software, bank and payroll portals.

What records must the new accountant get from the old one?

The new accountant needs everything that ties last year's return to this year's books. Records generally matter for 3 years after filing, and longer for property and losses (how long to keep records).

The written request (what people call a "changing accountants letter") lists those records by year, the delivery date and format, and asks the old firm to confirm what it filed and paid.

Does the old accountant have to return our records if we still owe a bill?

Generally yes. Section 10.28 requires a practitioner to return, on request, all client records needed to meet federal tax obligations, and a fee dispute generally does not change that. The practitioner may keep copies.

• Where state law lets a practitioner keep records over unpaid fees, the practitioner must still return the records that must be attached to the return, and give reasonable access to review and copy the rest.
• Your records include what you or third parties provided, and returns or schedules the practitioner prepared and gave you in an earlier engagement when needed for current filings. A prior-year depreciation schedule you received counts.
• Excluded: a return or schedule the practitioner is holding until you pay the fees for that document.
• The rule binds attorneys, CPAs and enrolled agents. Section 10.8 says it also covers anyone paid to prepare all or substantially all of a return, but a 2014 court decision (Loving v. IRS) limits the IRS's power over preparers without those credentials, so for them, and for a bookkeeper, the contract and state law matter most.

If the old firm does not answer, the new accountant can rebuild much of the federal side from the IRS: account transcripts through the Transcript Delivery System and copies of filed returns with Form 4506. Misconduct by a paid preparer can be reported on Form 14157. Depreciation schedules, ledgers and state workpapers usually exist only in the firm's files or your own books.

Fee disputes and contract claims are legal matters outside this page.

Can we switch payroll providers mid-year or mid-quarter (Form 8655)?

Yes, but switch on the first day of a quarter if you can. "File Form 941 only once for each quarter" (Form 941 instructions), so after a mid-quarter switch one Form 941 must carry both providers' wages. If either provider files one combined Form 941 for many employers under its own EIN (an aggregate filer), the instructions give different rules.

Form 8655 lets a reporting agent sign and file returns electronically, make deposits through EFTPS and receive duplicate notices; line 19 can add state and local returns. A new Form 8655 naming a new agent ends the prior agent's authority from the period shown, but the prior agent keeps disclosure authority for earlier periods unless that is revoked too. Form 8655 does not revoke a Form 2848 or 8821. The employer stays liable for every return and deposit either way. An officer, partner or employee who controls payments and willfully lets withheld taxes go unpaid can owe them personally under section 6672, the trust fund recovery penalty, generally assessable for 3 years from April 15 after the quarter's year (section 6501).

The new provider needs each employee's year-to-date wages and withholding. Without them, it keeps withholding social security past the $184,500 wage base. Missed deposits the handover uncovers are covered in behind on payroll taxes.

What changes for state income tax, payroll and sales tax accounts?

Each state agency has its own authorization form, and whether a new one cancels the old one differs. Examples:

• California Franchise Tax Board, Form 3520-BE: submitting it "will not revoke" earlier overlapping declarations, and authority generally expires six years after signing.
• California EDD, Form DE 48 for payroll: stays in effect until it is revoked or a new one is received.
• Texas Comptroller, Form 01-137 for franchise and sales tax: runs until a date you choose or until revoked in writing, and the signature can be no more than 12 months old when submitted.

Check each state where the company files, such as Virginia, Ohio or Washington. Which new states need returns is covered in business income tax in other states, registration in registering in another state, and sales tax in filing sales tax returns.

Who makes the next estimated tax payment?

Agree in writing who schedules each EFTPS payment. A C corporation pays installments by the 15th day of the 4th, 6th, 9th and 12th months when it expects tax of $500 or more, by electronic funds transfer (Form 1120 instructions).

There is generally no penalty if the company timely paid at least the smaller of this year's tax or last year's. Last year's counts only if that return covered 12 months and showed tax. A large corporation, with $1 million or more of taxable income in any of the 3 prior years, may base only its first installment on last year's tax (Form 2220 instructions). Growth from data center contracts can cross that line, and the next year's later installments must then follow current-year tax. How corporate tax works is covered in how C corporations are taxed.

Partnerships and S corporations generally pass income through, so owners pay estimates on their own returns. If the company elected a state pass-through entity tax, the company itself pays it on that state's dates; California wants the first payment by June 15 of the election year; for 2026 through 2030, a missed or short payment cuts the owners' credit by 12.5% of the unpaid amount (FTB). State estimates for a C corporation follow each state's own dates too; put them on the same written schedule.

Which IRS and state notices are still open?

List each open IRS and state notice with its response date and who answers it. Business Tax Account shows IRS notices. The notice-copy box on Form 8821 sends IRS copies to at most two designees for the same matters, so tick it for the new firm and confirm the old firm's box no longer applies.

What changes with a foreign owner or a Canadian project?

The steps stay the same, but the records list grows. A foreign-owned corporation also hands over Forms 5472 and the related-party ledger; see what your preparer needs for a foreign-owned corporation, and missed foreign-owner filings if the old firm never filed them. A Canadian project means a second tax authority:

The Canadian handover is covered in switching accountants in Canada. Contractors, suppliers and GPU clouds working on data center projects can see our data center services.

Example

Illustrative figures in US dollars.

Dallas electrical contractor: a missed $42,000 September installment

A C corporation starts data center work with crews in Virginia and Ohio and switches accountants on September 20, 2026. The old firm's Form 7004 acknowledgment shows the 2025 Form 1120 is due October 15, 2026.

• 2025 taxable income was $800,000 and tax $168,000, and taxable income stayed under $1,000,000 in each of 2023, 2024 and 2025. So for 2026 it may use last year's tax: four installments of $42,000.
• EFTPS shows April and June paid, and nobody scheduled September 15. The company pays now; a penalty runs on the shortfall from September 15 (Form 2220). The new firm schedules December 15.
• 2026 taxable income heads to $3,000,000, so in 2027 only the first installment can rest on 2026 tax.
• Payroll moves on October 1 under a new Form 8655; the old provider files the third-quarter Form 941.
• Texas franchise and sales tax access goes through Form 01-137.

GPU cloud leaving a bookkeeping platform: $6,000,000 of servers to carry over

A venture-backed Delaware C corporation leaves a startup bookkeeping platform in May 2026, after the platform filed Form 7004. A founder in Taipei owns 40% and lent $500,000, so the 2025 Form 1120 and Form 5472 are due October 15, 2026; a missed Form 5472 costs $25,000.

• $6,000,000 of GPU servers went live in a Dallas colocation data center in 2025, leaving a $5,000,000 net operating loss carryforward.
• The new firm asks for the 2024 Form 1120 and Form 5472, the Form 7004 acknowledgment, the asset-by-asset schedule, the loss schedule and the related-party ledger.
• The US-based CFO, an officer on W-2 payroll, registers Business Tax Account. The founder, as CEO, signs Form 2848 electronically and it is uploaded online.
• The platform's Form 8821 stays until the company revokes it.

Two-partner server reseller: Form 7004 by March 15

An LLC taxed as a partnership resells and installs servers and cooling in Virginia and North Carolina, plus one Ontario project. It switches on February 20, 2027, with nothing filed for 2026.

• The new firm files Form 7004 by March 15, 2027, with no signature needed. Form 1065 is now due September 15, 2027.
• Missing March 15 with no extension would have cost $260 × 2 partners, or $520, a month for up to 12 months.
• Either partner can sign Form 8821. Form 2848 needs both, or one partner with authority under state law to bind the partnership (such as under the operating agreement), with a copy of that authorization attached.
• The 2026 partnership representative is named on that return. Sales tax access is needed in both states; the Ontario project follows the Canadian rules.

Different for you?

• The books are months behind: see catching up on overdue books, or switching from cash to accrual accounting.
• Some years were never filed: see catching up on unfiled business returns.
• The new accountant finds a filed return wrong: see correcting a filed business return.
• A foreign-owned corporation's October 15 return: see corporate return due after an extension.
• A Canadian business that now needs US filings: see when a Canadian business needs a cross-border accountant.
• Crews or staff in another state: see employees in another state and Ohio city income tax for traveling crews.
• Sales in Washington, Ohio or Oregon: see gross receipts taxes in other states.
• Servers in another state's colocation data center: see servers in a data center in another state.
• GPU server depreciation schedules: see writing off GPU servers.
• Delaware annual report and franchise tax: see Delaware franchise tax.
• A funding round coming: see tax clean-up before investor due diligence.
• A missed extension, installment or several states at once: bring the due-date list, the Form 7004 acknowledgments and the EFTPS history to our CPAs for corporate tax returns.