How to dissolve a professional corporation

What is a professional corporation or PA?

A professional corporation (PC), called a professional association (PA) in a few states, is a corporation that licensed professionals form to practice a regulated field: medicine, law, dentistry, accounting, architecture, engineering, veterinary medicine and similar. Many states require licensed owners to use a PC or PA rather than an ordinary corporation, so that a professional licensing board keeps oversight of the entity. That oversight is the extra layer that makes closing a PC different from closing a plain corporation.

Underneath, it is still a corporation, so its closure follows corporate dissolution: a plan of dissolution, IRS Form 966, a final corporate return, payroll wind-down, and the state filing. If your professional entity is an LLC rather than a corporation, you want the PLLC version instead, same professional layer, but LLC mechanics. And if the PC elected S-corp taxation, the final-return details of dissolving an S corporation apply on top.

What is the licensing-board layer?

This is the step unique to professional entities, and the one the Secretary of State never mentions. The board that authorized your PC may require written notice that the corporation is dissolving, confirmation that active client or patient matters have been wound down or transferred, or a clearance before it treats the professional registration as closed. The rules vary by state and by profession, a medical board, a state bar and a board of accountancy each run their own process, so the reliable move is to contact your board or read its rules on closing a practice before you file the state paperwork.

Doing the board notice first means the state dissolution and the licensing side line up, rather than leaving an open professional-registration question after the corporation already shows closed.

How do you dissolve a PC, step by step?

1. Confirm your board's requirement. Learn whether your licensing board wants notice or clearance, and what winding down client matters means in your field.
2. Adopt a plan of dissolution. The shareholders approve dissolution the way the bylaws require and record it in a written plan or resolution. This date starts the Form 966 clock.
3. File Form 966 within 30 days. Attach a copy of the adopted plan.
4. Wind down payroll and client matters. File final payroll returns, issue W-2s and 1099s, close or transfer open files, and set up record retention for your board's required period.
5. File the state dissolution. Articles or a certificate of dissolution with your Secretary of State, plus tax clearance where the state requires it.
6. File the final corporate return and close the IRS account. A final 1120 or 1120-S marked final, then close the IRS business account behind your EIN.

How do Form 966 and the plan of dissolution work?

Form 966, “Corporate Dissolution or Liquidation,” is the IRS's notice that a corporation has adopted a plan to dissolve. The instruction is to file it within 30 days of the resolution, with a copy of the adopted plan attached. A professional corporation is a corporation, so this applies, being a regulated practice does not exempt you. The common trap is timing: owners handle the state and board paperwork first and turn to taxes weeks later, by which point the 30-day window has quietly closed.

What about final returns and payroll?

A dissolving PC files a final corporate return for its last, usually short, tax year with the final-return box checked, Form 1120 if it is a C corporation, Form 1120-S with final K-1s if it elected S status. It almost always has payroll to wind down too, because professional owners are typically paid a salary: final Forms 941 (or 944) and 940 marked final, W-2s to employees and 1099s to contractors, and the state payroll, withholding and unemployment accounts closed. Those state payroll accounts are the ones the Secretary of State filing never touches, so they keep generating notices if left open. The S-corp dissolution guide walks the final-return mechanics in more detail.

What about client records and the malpractice tail?

Two professional duties outlive the corporation. First, record retention: most boards require client, patient or engagement files to be kept for a set number of years after a matter closes, and dissolving the entity does not shorten that. Plan for secure storage, transfer to another licensed provider, or a records custodian, and tell clients how to reach their files.

Second, the malpractice or professional-liability tail: closing the corporation does not end exposure for work done while it was open. Many professionals buy tail coverage, an extended reporting period on their policy, so a claim made after the practice closes is still covered. That is a conversation with your insurer, but it belongs on the closing checklist so nothing about the wind-down is left uncovered.

How do you close the IRS account and EIN?

The IRS does not cancel an EIN, the number is permanent and never reassigned. What you close is the business account attached to it, by sending the IRS a letter with the entity's legal name, EIN, address and reason for closing, after the final returns are filed. The IRS will not close the account while final returns are outstanding, which is why this step comes last. Because a professional corporation nearly always has an EIN, payroll and shareholder reporting, this step almost always applies. Full detail is on closing your IRS business account.

Rather have it handled?

A professional corporation carries the corporate paperwork, the payroll wind-down and the licensing layer all at once, which is exactly why it fits our Complete Closure package: the state filing, the IRS account, and guidance on Form 966 and the final returns, with the board requirements flagged. A specialist confirms the scope on a call first and is on WhatsApp 24/7.

This page is general information about dissolving a professional corporation, not legal or tax advice. Your licensing board's rules and the final year's return are worth confirming with your board and a CPA.