A California CPA practice can be marketed, valued, negotiated and signed without a single client, employee or competitor learning of it. It cannot be closed that way. Once the purchase agreement is signed, 16 CCR 54.3 requires a written notice to every client subject to the sale, and no client record can move to the buyer until the client consents or 90 days pass without an objection. So “confidential” means three things in practice: a buyer sees nothing that identifies a client until a written nondisclosure agreement is signed, which Business and Professions Code 5063.3(a)(4) makes a condition of the disclosure; diligence runs on coded data and the names come out after the letter of intent; and staff and clients hear about the sale after signing, from you, in that order. After closing, the buyer pays for a transition in which you stay. For a tax practice that is one filing season in most of the deals we see, two where the holdback runs two seasons.
Everything below is taken from the California regulation and statute, the federal regulation on tax return information, the AICPA Code of Professional Conduct, and two published sources on transition periods, each read October 20, 2026 and linked at the end. The calendar tool in the first section back-plans the dates from the filing season you want the buyer to open the files for.
- 01Before any client information reaches a prospective buyer, the parties must sign a written nondisclosure agreement covering all client information shared (BPC 5063.3(a)(4)). A profile with fee totals, client counts and service mix is not client information; a list with names is.
- 02For tax return information the federal rule is Treasury Regulation 301.7216-2(n): a buyer may review the client list in diligence only under a written agreement that requires confidentiality and bars any use other than evaluating the purchase. The buyer takes the list subject to the same restrictions.
- 03After signing, every client subject to the sale gets a written notice by first-class or certified mail, or by email if the client has consented in writing to that method. The notice asks consent to transfer the records and says consent is presumed if the client does not object within 90 days. Files move when a client consents or on day 91, whichever is sooner. Copies are kept four years.
- 04Staff hear after signing and before the client letters, from you, with the buyer present. No California rule sets the moment; the sequence is what keeps the sale off the street until you want it known.
- 05The seller stays. Published guidance ranges from a few weeks to six months for small firms and one to two years above $2 million in fees; for a California tax practice the working answer is one filing season, paid separately from the price, with phone availability afterwards.
Can I sell without my clients finding out?
Yes, until the day you sign. The listing, if there is one, is blind. The buyer signs an NDA before seeing anything that identifies a client. Diligence runs on coded schedules. The letter of intent and the purchase agreement are between you and the buyer. Nobody outside the two of you, your advisers and the buyer’s advisers needs to know, and a deal with a direct buyer, as opposed to a listed one, never appears on a brokerage site at all.
No, from the day you sign. California adopted section 54.3 of Title 16 with effect from April 1, 2024, and it applies to any licensee who sells or transfers all or part of a practice and will no longer hold any ownership in it. The notice goes to every client subject to the sale and it names the successor. From that letter forward the sale is known to your clients, and through them to anyone they tell. The rule has a purpose you will come to appreciate: the letter is your chance to say why you chose this buyer and that you are staying through the season, which is the single most effective retention step a seller has. Clients who learn of a sale from the new owner, or from a changed email signature, leave at a higher rate than clients who learn of it from the person they have trusted for fifteen years. So the question is not whether clients find out but when and from whom, and the answer that keeps the practice intact is after signing, from you, by letter and then in person for the ones who matter.
The confidential sale calendar
Pick the date by which you want the buyer to have the files and the length of time you intend to stay. The date is preset to the earliest one an agreement signed today allows. The tool works backwards from the 90-day window to the latest dates for mailing the notice and signing the agreement, and forward to your last day. It assumes the notice is mailed within a week of signing and that a buyer with committed capital needs about twelve weeks from the first conversation to closing.
Mail the client notice by
Sign and fund by
First buyer conversation by
Your last day in the office
Files move on the 91st day after the date of the written notice unless each client consents sooner (16 CCR 54.3(a)). The notice is assumed mailed seven days after signing and the first conversation twelve weeks before signing, which is the WIN process length; a listed sale through a broker usually takes longer. The staff announcement sits between signing and mailing. Not legal advice; the purchase agreement sets the dates that bind.
What you can show a buyer before anything is signed
Section 5063.3 starts from a prohibition: no confidential information obtained in your professional capacity about a client or a prospective client may be disclosed without the client’s written permission. Paragraph (a)(4) is the exception for practice sales, and it is conditional: disclosure to another licensee or person in connection with a proposed sale or merger is permitted provided the parties enter into a written nondisclosure agreement with regard to all client information shared. Before that agreement exists, what you can give a buyer is information about the practice that is not information about a client.
That is enough for a buyer to decide whether to proceed and roughly what to pay. The blind profile that a direct buyer or a broker works from carries the following and nothing that identifies anyone.
| In the blind profile | Not in it |
|---|---|
| Three years of gross fees by service line: 1040, business returns, bookkeeping, payroll, advisory, attest | Any client name, address, entity name or taxpayer identification number |
| Client counts by type, average fee per return, number of clients over $5,000 and over $10,000 in annual fees | The schedule of fees by client |
| Concentration as a percentage: the share of fees from the top one, five and twenty clients | Who those clients are |
| Staff by role, tenure and hours, without names; the owner’s hours and the share of returns the owner signs | Staff names and compensation by person |
| Software, lease term, county, whether the office transfers, the owner’s intended transition | The street address |
| Seller’s discretionary earnings with the add-backs listed; the asking range if there is one | Tax returns of the practice itself, until the NDA |
Two other rules sit alongside 5063.3 and say the same thing in their own words. For tax return information, Treasury Regulation 301.7216-2(n) permits a preparer’s client list to move with the sale of the tax preparation business and treats diligence before the sale as part of that sale, but only if it is conducted pursuant to a written agreement that requires confidentiality of the tax return information disclosed and expressly prohibits the further disclosure or use of the tax return information for any purpose other than that related to the purchase of the tax return preparation business. A CTEC-registered preparer selling a tax practice has the state equivalent in BPC 22252.1(a)(4). And the AICPA Code addresses the same disclosure in interpretation 1.700.050, disclosing client information in connection with a review or acquisition of the member’s practice. One NDA written to satisfy all three is the normal practice.
The NDA: what it has to cover
Most broker NDAs are written to protect the seller’s identity and the financial statements. They are not always written to the two legal standards above, and a buyer’s counsel will not add the missing clauses for you. The agreement should be signed before the first name is disclosed, by the buyer entity and by any individual who will see the material, and it should contain the following.
| Clause | What it does | Why it is there |
|---|---|---|
| Definition of confidential information that expressly includes all client information shared between the parties, in any form | Makes the agreement the one BPC 5063.3(a)(4) calls for | The statute conditions the disclosure on a written NDA “with regard to all client information shared” |
| Purpose limitation: no disclosure or use of tax return information for any purpose other than evaluating the purchase | Tracks the words of Reg. 301.7216-2(n) | Without it, the review of your client list in diligence can be a disclosure under IRC 7216, a criminal statute, and the civil penalty section 6713 |
| Named recipients: the buyer’s principals, lender, accountant and counsel, each bound | Limits who sees the files | A platform buyer has analysts, an SBA lender has underwriters; you want to know who |
| No solicitation of your clients or your staff for a stated period if the deal does not close | Protects what the buyer learned | California voids employee non-competes under BPC 16600, but a non-solicitation covenant in an NDA between buyer and seller, limited to information learned in diligence, is a different instrument; have counsel draft it to the current case law |
| Return or destruction of all material on request or when talks end, with written confirmation | Closes the file | The coded schedules and any names must leave the buyer’s systems |
| Term that survives the end of negotiations | Keeps the obligation alive | Most sales talk to two or three buyers before one signs |
| Governing law California, and a statement that the agreement is intended to satisfy BPC 5063.3(a)(4) and Reg. 301.7216-2(n) | Removes the argument later | If the Board or a client ever asks, the intent is on the face of the document |
The NDA does not need to be long. Two to four pages is usual. What it must not be is the buyer’s own form with the purpose limitation missing, signed in a hurry because the buyer is ready to make an offer.
Diligence without names
With the NDA signed you may disclose client information. That does not mean you should disclose all of it at once. The sequence that keeps a sale confidential if it falls through, and most first offers do fall through, is coded data until the letter of intent and named data after it.
Coded data means the client list with each client replaced by a number, carrying the fee for each of the last three years, the entity type, the services, the preparer, and whether the client has been with the practice more than five years. The buyer can price the practice from that schedule. The top twenty by fees are flagged so the buyer sees concentration. Staff appear by role and tenure. The practice’s own tax returns and bank statements are disclosed at this stage, because they identify you but not your clients, and a buyer who will not sign a letter of intent without seeing them is being reasonable.
After the letter of intent the names come out, in a data room or on a visit to the office after hours, and the buyer samples files. CAMICO’s guidance for CPA firms notes that the federal regulations do not provide for an acquirer’s quality review of tax returns, so a review of actual returns before closing needs either the client’s consent under Reg. 301.7216-3 or a selection made from a numbered list that corresponds to an alphabetized master kept by you. In the deals we see the buyer reviews a sample of files chosen by number, with the identifying pages covered or the review conducted on your premises, and leaves with the schedule, not the files. The files themselves move only after the 54.3 window.
Inside your own office, one person besides you knows. It is usually the bookkeeper or office manager who produces the fee reports, and that person will also run the notice log after signing, so choose someone who is staying. Everyone else learns on the day described in the staff section below. Your spouse, your attorney and your CPA know from the start. Your landlord learns at the assignment of the lease, which is usually in the week before closing.
The 90-day client consent rule in detail
Section 54.3 is short and its requirements are specific. It applies to a licensee who sells or transfers all or part of the practice to a successor and will no longer retain any ownership in it. A merger in which you keep equity is outside the section, which is one reason the AICPA’s ethics staff treat equity mergers differently from sales. For a sale, the section requires the following.
| Requirement | The rule |
|---|---|
| Who is notified | Each client subject to the sale or transfer. Former clients whose files are not part of the sale are not notified under 54.3, but their records are returned without delay or as agreed. |
| How | First-class or certified mail to the last known address, or electronic transmission to an email address the client has authorized in a written confirmation that names the address. An email to a client who has not given that written consent is not notice. |
| What the notice says, at a minimum | A request for the client’s consent to transfer the client’s records to the successor, and a statement that consent will be presumed if the client does not notify you of an objection within 90 days from the date of the written notice. |
| When records move | Not until the client consents or the 90 days lapse without objection, whichever is sooner. A signed consent on day 10 moves that client’s file on day 10. |
| Objections | The client’s records are returned without delay, or as agreed with the client. The client is not obliged to give a reason. |
| Clients you cannot reach | A notice returned by mail or email demonstrates the attempt. That client’s records are not transferred and are retained by you for at least four years from the date of sale, longer for audit documentation under 16 CCR 68.3, then destroyed so the personal information is unreadable. |
| Records to keep | A legible, complete copy of each notice and of every consent or objection, paper or electronic, for at least four years from the date of sale. |
| Client records | As defined in 16 CCR 68, including working papers under 68.1 where they form part of the client’s records. |
The AICPA interpretation, ET 1.400.205, runs on the same clock with one difference in wording: the member may presume consent after a period of not less than 90 days, unless prohibited by the state board. The California rule sets the period at 90 days, so one letter drafted to 54.3 satisfies both. The buyer has a duty of its own under paragraph .05 of the interpretation to be satisfied that the clients have consented, which is why a careful buyer asks for the notice log at closing. The letter itself, with the consent paragraph that the regulation requires and the retention language that keeps clients, is in letters for selling a CPA practice.
What the rule does to the calendar is the part most sellers meet too late. The window is measured from the date of the notice. A notice mailed October 1 clears on December 30; a notice mailed December 15 clears on March 15, with the season half over. If the buyer is to open the files before the filing season, the agreement is signed in September or early October. Closings signed in November and December are workable, but the buyer runs the first part of the season on consents received, not on the full list, and the holdback or the look-back price should be drafted with that in mind. A sale signed in May, with the notice mailed in June and the window closed by September, is the calmest version of the calendar, and it is why many California tax practices change hands in the summer.
When staff find out, and what they are told
No California rule sets the moment. The sequence that works is signing, then staff, then the client letters, all within about a week. Staff who learn of a sale from a client letter, or from a client, do not forgive it, and the buyer is pricing their retention. The conversation is held in person, by you, with the buyer in the room, and it covers four things: that the practice has been sold and to whom, that the office, the name and the jobs continue, what changes for them in pay, benefits and the employer of record, and that you are staying through the season. Retention bonuses for the one or two people the practice cannot run without are agreed with the buyer before signing and announced in that meeting, not after it.
The person who will log the notices, the consents and the objections for the next 90 days needs to be in that room and needs to be staying. If the sale changes the employer of record, final wages and accrued vacation are due at the change under Labor Code 201 and 227.3, and the payroll handoff is written into the purchase agreement; the mechanics are in how to sell a CPA practice. Before signing, the published guidance and the deals we see agree: the uncertainty of a pending sale costs you people, and nothing you can tell staff before the agreement exists is certain enough to be worth that.
How long you stay after closing
The published range is wide because practices are. The Journal of Accountancy’s guidance on retention after a sale says the seller should be prepared to help the buyer for at least the first few weeks or months and to be available for occasional calls afterwards, that complicated practices need longer, and that the transition time should be agreed in writing and should not include free billable work by the seller. Firmlever’s 2025 exit-timing guide gives three to six months as common for smaller firms and one to two years for firms above $2 million in revenue, where buyers want the owner for client retention and the handover of leadership.
For a California tax practice the working answer in the deals we see is one filing season. The reasons are mechanical rather than sentimental. Clients meet the successor when they bring in their documents, which happens once a year; a seller who leaves in November has introduced nobody. The 54.3 window usually overlaps the start of the season, so the seller is still the licensee of record for clients who have not yet consented. And the holdback or retention adjustment in most deals is measured on the first season’s collections, which the seller has every reason to protect in person. Where the look-back runs two seasons, the stay is two seasons at reduced hours in the second. Beyond that, a part-time arrangement of a day or two a week through the following year is common and is paid as consulting, separate from the price.
| Practice | Typical stay | What the stay consists of |
|---|---|---|
| Tax and bookkeeping, under $1 million in fees, owner signs most returns | Through the next filing season, then calls | Joint client meetings, introductions to the top fifty in person, review of the first returns the successor signs, the notice log |
| Tax and bookkeeping, $1 million to $2 million, staff preparers | One season full time, a second at reduced hours | The same, plus the handover of staff supervision and the business clients’ quarterly cycle |
| Practice with attest work or more than $2 million in fees | One to two years, often as an employee or non-equity partner | Engagement continuity, peer review history, the audit clients’ committees and lenders |
| Owner in poor health or deceased | Little or none | The published guidance notes clients accept a short transition when the reason is known and the sale proceeds are contingent on retention; disclosure of that contingency helps |
Three things to settle in the purchase agreement rather than afterwards. The stay is paid: a salary or an hourly rate for the season, distinct from the purchase price, so the price is not quietly reduced by a season of unpaid work. The stay has a defined scope and a defined end, with the phone availability afterwards stated as a courtesy and not a duty. And the license status you hold through the stay is decided with the calendar in view; a seller who signs returns during the season is active, and the move to retired status under BPC 5070.1, which permits receiving a share of profits or other compensation from the firm, is timed to the last signed return. The license side is in the renewal article.
The calendar for a tax practice, by signing month
The same rules produce a different calendar depending on when you sign. The table assumes the notice is mailed within a week of signing and that you stay through the following April.
| Signed | Notice mailed | Window closes | Season with the buyer | Your last day |
|---|---|---|---|---|
| May 2027 | Early June 2027 | Early September 2027 | 2028 season, files in the buyer’s hands all season; extensions and quarterly work during the window | April 30, 2028 |
| September 2026 | Early October 2026 | Early January 2027 | 2027 season from the first day | April 30, 2027 |
| November 2026 | Early December 2026 | Early March 2027 | 2027 season on consents received; the buyer opens the rest in March; the holdback is drafted for a partial first season | April 30, 2027 |
| January 2027 | February 2027 | May 2027 | You run the 2027 season as licensee of record with the buyer alongside; the buyer’s first full season is 2028 | April 30, 2028, or a shorter paid stay if the buyer accepts the retention risk |
A first conversation in late spring or summer, a letter of intent by August and a September signing is the sequence that gives a buyer the season and gives you a defined exit the following spring. It is also the sequence that keeps the sale confidential for the longest stretch of the year with the least to explain, because the busy months in which staff notice a stranger in the office are the ones you avoid.
How a sale to WIN stays confidential
Wilshire Intelligence Network buys established CPA and tax practices across California and pairs each one with a practicing CPA who becomes its owner. There is no listing and no broker; the practice is never shopped. An NDA drafted to BPC 5063.3 and Reg. 301.7216-2(n) is signed before any client information is disclosed, diligence runs on coded schedules until the letter of intent, and the equity capital is committed before an offer is made, so there is no lender and no financing contingency to widen the circle. The client notices go out in your name and on your letterhead, and your staff hear from you, with us in the room, after signing. You stay two or three seasons at meaningful compensation and introduce your successor client by client, or step back sooner; the term is yours to set.
The first step is one call with our CPA team. We send a written valuation, with terms, within 24 hours of it, and the call commits you to nothing.
Sources
- 16 CCR 54.3, Sale or Transfer of Licensee’s Practice: new section filed December 4, 2023, operative April 1, 2024; notice content, mailing and electronic transmission, the 90-day presumption, objections, unreachable clients, four-year retention and disposal. 16 CCR 54.4 for a practice discontinued without a successor. Read October 20, 2026.
- Business and Professions Code 5063.3 (amended by SB 887, effective January 1, 2024): the confidentiality rule and the sale-or-merger exception conditioned on a written nondisclosure agreement, subdivision (a)(4). BPC 22252.1, the equivalent for registered tax preparers.
- Treasury Regulation 301.7216-2(n): transfer of a taxpayer list in conjunction with the sale of a tax return preparation business; diligence under a written confidentiality agreement with a purpose limitation. Read October 20, 2026.
- AICPA Code of Professional Conduct, ET 1.400.205 (transfer of files and return of client records in sale, transfer, discontinuance or acquisition of a practice) and ET 1.700.050 (disclosing client information in connection with a review or acquisition of the member’s practice).
- CAMICO, Responsibilities to Clients When a CPA Firm Is Merging or Acquired (Arthur J. Dellinger Jr., CPA, May 17, 2022): equity and non-equity transferors, the 7216 limits on pre-closing return review, the numbered-list approach.
- Journal of Accountancy, How to keep clients after an accounting practice sale (Harry L. Olson, CPA, September 2016): seller transition length, paid transition time, the reasons clients are told, the health exception.
- Firmlever, Exit Planning and Timing (November 30, 2025): three to six months for smaller firms, one to two years above $2 million, staff told when the deal is signed. BPC 16600 and 16601 on restraints and the sale-of-goodwill exception.
This article is general information for California practice owners and is not legal advice. The regulation and statutes are quoted as published on the dates shown; the purchase agreement, the NDA and the client notices should be drafted or reviewed by counsel admitted in California before they are signed or sent.
Denis is a practicing tax and accounting professional and the principal of VistaTax, a California practice serving individuals and closely held businesses: individual and business tax preparation, tax planning, bookkeeping, financial reporting and payroll. As WIN’s founding CPA he anchors the licensed side of the structure and sits at the table for every transition. More about WIN’s team.