A transition letter for your practice tells clients, patients, or account holders that your professional relationship is ending, when it ends, and who (if anyone) is taking over. To write one that holds up, state the change and its effective date, name the successor and their contact information, tell the client plainly that they can choose any replacement they want, address pending deadlines and money held on their behalf, include an authorization form for transferring records, and send it with proof of delivery far enough ahead that the client has time to act.
The rest of this guide walks through what goes in the letter, what changes if you’re a lawyer, financial advisor, or physician, how much notice counts as reasonable, and how to document that you sent it.
What the Letter Has to Cover
Open with the three facts the reader needs in the first paragraph: what is changing, the date it takes effect, and the reason (retirement, resignation, sale, merger). Vagueness here causes real problems. If a client doesn’t understand that their current representation ends on a specific date, they may assume someone is still watching their matter when no one is.
Next, identify the successor by name, office address, and direct phone number. If no successor has been arranged, say so plainly and explain how the client can find a replacement. Many transition letters fall short here because the writer is focused on the logistics of their own departure and forgets that the client’s immediate question is who handles their matter now.
From there, the letter should address:
- Pending deadlines: upcoming court dates, filing deadlines, regulatory submissions, or account milestones the client needs to know about.
- File and asset status: where the client’s physical and digital records are currently stored and what happens to them next.
- Financial matters: the status of any retainers, trust account balances, unearned fees, or investment account valuations.
- Authorization instructions: how the client can consent to transferring records to a new provider, or how to retrieve files directly.
Attach an authorization form or signature block so the client can give written consent for the file transfer in one step. Specify the categories of records being transferred — litigation files, tax returns, medical records, account statements — because a general “we’ll send your files” leaves too much ambiguity about what the successor actually receives.
Tell the Client They Can Pick Anyone
This is the point transition letters most often bungle. The client is not obligated to follow you to your new firm or accept the successor you recommend. The letter has to say, in plain language, that the client may choose any replacement they want or take possession of their file and handle it themselves.
For attorneys, ABA Model Rule 1.16(d) requires that upon termination, a lawyer allow time for the client to find other counsel and surrender papers and property the client is entitled to.1American Bar Association. Model Rules of Professional Conduct – Rule 1.16 Declining or Terminating Representation When a law practice is sold, Model Rule 1.17 requires the seller to give written notice of the proposed sale, inform each client of the right to retain other counsel or take their file, and allow 90 days for the client to respond before consent to the transfer is presumed.2American Bar Association. Model Rules of Professional Conduct – Rule 1.17 Sale of Law Practice
For investment advisors, the Investment Advisers Act of 1940 prohibits any SEC-registered adviser from assigning an advisory contract without client consent.3Office of the Law Revision Counsel. 15 USC 80b-5 Investment Advisory Contracts Assignment includes any direct or indirect transfer of the contract, so a firm merger or ownership change can trigger the consent requirement even when the client’s day-to-day advisor hasn’t changed. A client who never consented may be able to void the contract entirely.
Burying the right to choose in fine print, or leaving it out, is the kind of shortcut that generates complaints.
What Changes by Profession
Lawyers
ABA Model Rule 1.4 requires lawyers to keep clients reasonably informed and to explain things well enough for the client to make informed decisions.4American Bar Association. Model Rules of Professional Conduct – Rule 1.4 Communications For a transition letter, that means listing every pending deadline, not just the next one on the calendar. Statutes of limitations that would normally sit quietly in a file become urgent when nobody is actively monitoring them.
Rule 1.16(d) also requires you to refund any fees or expense deposits that haven’t been earned or spent.1American Bar Association. Model Rules of Professional Conduct – Rule 1.16 Declining or Terminating Representation Unearned retainer balances sitting in a trust account belong to the client. Your letter should say what the balance is and either return it or get the client’s written instruction to transfer it to the successor.
Financial Advisors and Registered Representatives
When a registered representative moves to a new brokerage, FINRA Rule 2273 requires the new firm to provide former customers with a standardized educational communication prepared by FINRA. If the first contact is in writing, the communication must be included with it. For oral contact, it must follow within three business days.5Financial Industry Regulatory Authority (FINRA). FINRA Rule 2273 Educational Communication Related to Recruitment Practices and Account Transfers The obligation runs for three months after the representative joins the new firm and covers every former customer whose securities account was assigned to that representative. Institutional accounts are exempt.
If the client chooses to transfer, the carrying firm must complete a validated transfer through FINRA’s Automated Customer Account Transfer Service within three business days.6Financial Industry Regulatory Authority (FINRA). FINRA Rule 11870 Customer Account Transfer Contracts Mention that timeline in the letter so clients know what to expect and can flag delays.
Physicians
No single federal statute sets the exact number of days a doctor must give before closing a practice, but most state medical boards require at least 30 days of advance notice. The letter should tell patients how to obtain copies of their records, how to contact any physicians remaining in the practice, and that they may choose any new provider they want.
The American Medical Association’s ethics guidance adds that when a physician discontinues a practice, records not transferred to the patient’s current physician must be appropriately stored, and the patient must be told how to access those stored records and for how long they’ll remain available.7American Medical Association. Management of Medical Records
How Much Notice Is Enough
Every set of professional rules calls for “reasonable notice,” and almost none define it in days. ABA Formal Opinion 489 describes reasonable notice as the minimum time necessary for clients to decide who will represent them, for files to be assembled and transferred, and for the firm to adjust staffing on affected matters.8The Business Divorce Lawyer. ABA Formal Opinion 489
In practice, the right notice depends on the matter. A straightforward estate plan might need a week. Active multi-party litigation with upcoming trial dates might need 60 days or more. For medical practices, the 30-day state board minimum is a floor; patients in complex ongoing treatment may need considerably more lead time to establish care elsewhere. The client’s needs control, not a partnership agreement or internal firm policy.
Send It With Proof of Delivery
How you send the letter matters as much as what it says. The goal is verifiable proof that the client received the notification, or at minimum, that you made a genuine attempt to deliver it.
Certified mail with return receipt requested remains the standard. Courts and regulators widely accept it as evidence that a document was mailed and delivery was either completed or attempted. In many jurisdictions, a documented attempt is enough to satisfy notice requirements even if the recipient refuses the letter or never picks it up. Secure electronic portals with read-receipt tracking serve the same function for clients who communicate digitally.
Once sent, file a copy of the letter in the client’s permanent record along with the tracking number or delivery confirmation, and log the date of any response. If the tracking shows “refused” or “unclaimed,” keep that too. It still demonstrates you met your obligation to notify.
When a Client Doesn’t Respond
Silent clients are one of the most common headaches in professional transitions, and the rules account for them. When a law practice is sold, Model Rule 1.17 presumes consent to the file transfer if the client takes no action within 90 days of receiving notice.2American Bar Association. Model Rules of Professional Conduct – Rule 1.17 Sale of Law Practice If a client cannot be given notice at all, the file can only be transferred by court order.
For physicians, unreachable patients don’t relieve you of the duty to safeguard their records. The AMA’s guidance requires that records be stored appropriately even when no transfer occurs, and that any records scheduled for disposal be destroyed in a way that protects confidentiality.7American Medical Association. Management of Medical Records
The practical approach across professions: send the letter, document the attempt, follow up at least once by a second method (phone, email), and then hold the file securely. Your confidentiality obligations survive the end of the relationship, so you can’t simply hand inactive files to a successor without consent or leave them in an unsecured location.
How Long to Keep the Letter
Retention requirements depend on your profession and state. Attorneys should keep records long enough to outlast any applicable statute of limitations for malpractice claims, which varies by state but commonly runs three to six years. HIPAA requires covered entities to retain documentation of their privacy practices for at least six years from the date of creation or the date the document was last in effect, whichever is later.9eCFR. 45 CFR 164.530 – Administrative Requirements State medical record retention laws range from five years in some states to more than ten in others, with no single federal minimum for clinical records.
Financial professionals face their own schedules under FINRA and SEC rules. A safe general approach is to keep the transition letter, signed authorization forms, and delivery confirmations for at least seven years. That covers most regulatory lookback periods and gives you a solid defense if a former client later claims they were never notified.