When to Send a Client Anniversary Note

A client anniversary note lands hardest when it arrives at a moment the client actually recognizes as meaningful. That moment is rarely the calendar date you signed them. The right timing depends on what your client's year actually looks like—and it differs sharply by practice type.

The Four Timing Options

Anniversary of First Engagement

This is the date you opened the file or signed the engagement letter. It marks the beginning of the relationship.

For accountants: This timing works if you serve clients year-round, but it often falls in the noise. If you onboard clients in March and send a note in March the following year, it arrives during tax season when your client is drowning. Better to pick a different moment.

For attorneys: This can work well if your matters are discrete and you close them. A note on the one-year anniversary of case resolution or closing a transaction feels natural. Example: "A year ago this month we closed your acquisition. I wanted to mark the time and thank you for the trust you placed in us."

For financial advisers: An engagement anniversary is solid here because it aligns with how advisory relationships are structured. It gives you a clean moment to reflect on the year and preview the year ahead. Example: "It's been a year since we started working together on your portfolio. I'm grateful for the opportunity to serve you."

The risk: If you're sending dozens of these, the dates scatter across the calendar and you end up writing them ad hoc instead of building a standing quarterly habit.

Calendar Year-End

December or early January, when most businesses close their books and reset.

For accountants: Avoid this entirely. Your clients are either in the thick of year-end close or buried in tax prep. A note in December reads as tone-deaf. January is slightly better, but only marginally.

For attorneys: This can work if you serve corporate clients who think in calendar years. It's a natural moment to reflect on the year's work and look ahead. Example: "As we close out 2024, I wanted to thank you for the matters we handled together. I look forward to serving you again in the year ahead."

For financial advisers: This is a strong option. Many clients review their portfolios and financial plans at year-end, and a note from you reinforces that you're thinking about their long-term picture. Example: "As we move into the new year, I wanted to thank you for another year of working toward your goals together."

The risk: Everyone sends something in December. Your note competes with holiday cards from every vendor they work with.

Tax-Season Wrap or Fiscal Year-End

For accountants, this is the moment after you've filed returns or closed the books—when the client can finally breathe.

For accountants: This is your strongest option. Send a note in early May (after April 15 for most individual clients) or shortly after you've closed the client's fiscal year-end. This is when the client actually has time to read it and when they're most aware of the value you delivered. Example: "We just filed your return. I wanted to thank you for the smooth engagement and for trusting us with your tax planning."

For attorneys: If you serve corporate clients, send a note after their fiscal year-end close, when their finance team has time to breathe. This shows you understand their calendar.

For financial advisers: This timing is less relevant unless you're coordinating with tax planning. Skip it in favor of engagement anniversary or calendar year-end.

The risk: None, if you're an accountant. This is the right moment.

Policy Renewal Date or Service-Renewal Milestone

For advisers and agents, this is the date the client's policy renews or their service contract comes up for review.

For financial advisers: This is excellent timing. A note before or shortly after renewal reminds the client why they chose you and opens the door to a conversation about any changes in their situation. Example: "Your portfolio review is coming up next month. I wanted to thank you for the trust you've placed in me and for the opportunity to help you stay on track."

For insurance agents: Renewal is your natural moment. A note 30 days before renewal, thanking the client for their business and confirming you're handling the renewal, is both gracious and practical. Example: "Your policy renews next month. Thank you for your continued trust. I'll have the renewal details to you by [date]."

For accountants and attorneys: This timing doesn't apply unless you have explicit retainer relationships with renewal dates.

The risk: If you tie the note to renewal, make sure it genuinely thanks them for the relationship and does not read as a sales pitch. A note that feels like a renewal reminder will land wrong.

How to Choose

Start with your practice type and the natural rhythm of your client work. Accountants should anchor to tax-season wrap. Financial advisers should use engagement anniversary or renewal date. Attorneys should pick engagement anniversary or calendar year-end, depending on whether your matters are discrete or ongoing.

Then check your own book of business. Look at when you actually have capacity to write and when your clients are most likely to be receptive. A note that arrives when the client is in crisis mode will not land the way you intend.

The goal is consistency, not perfection. Pick one timing and stick with it. A standing quarterly habit—even if it's just one quarter per year—compounds far more than sporadic notes sent whenever you remember.

If you're sending dozens of notes, batch them. Write them all at once, in one sitting, and mail them together. This is far easier than trying to remember individual clients across a scattered calendar.