Tax season

How to prepare an accounting firm for tax season

Tax season does not fail in April. It fails in December, when the client list is stale, the organizer is not ready and every client is asked for documents in the same week. This guide covers the preparation that makes the season manageable: the client list, the organizer, the send waves, the document deadlines and the follow-up that keeps a late K-1 from turning into a late return.

Reviewed November 3, 2026 · 5 min read

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Key takeaways

  • Clean the client list before the season, not during it.
  • Send organizers in waves over the working days the firm chooses, not all on one day.
  • Give each client one document deadline and a reminder schedule that matches their history.
  • Separate the clients who are waiting on a K-1 or a corrected form from the clients who simply have not sent anything.

Clean the client list before the season

Start with the prior-year return list, not the email contacts. Check each client's name, filing status, entity type, email address, phone number and the services the firm provides.

Remove the clients who left and add the clients who joined during the year. A tax season that starts with the wrong list sends organizers to the wrong people and misses the new clients.

Group the clients by the work they need: individual returns, business returns, both, payroll, 1099s or a special project. The group decides which organizer they receive and when.

Build the organizer from last year

Start from the prior-year organizer and update the tax year, the form names and the thresholds. Add the items that came up last season, such as a new rental property, a crypto exchange or a foreign account.

Use conditional questions for the items that only apply to some clients. A client with no business income should not see the Schedule C section; a client with no dependents should not have to read the dependent items.

Review the organizer with the preparer who will use it. An organizer that asks for the wrong document creates a missing-item problem that the firm discovers in March.

Send in waves, not all at once

A firm that sends 400 organizers on January 2 creates 400 client questions in the same week. A firm that sends a few each working day spreads the questions and the document uploads across the season.

Send the clients with the simplest returns first, then the clients with businesses and K-1s. The order gives the preparers a steady flow of work instead of a pile at the end.

Tell each client when their organizer is coming, especially the clients who expect it in December. A short note in advance reduces the "where is my organizer" emails.

Set one document deadline and a reminder schedule

Every organizer should carry a document deadline that leaves the preparer enough time to review and file. The deadline can differ by client, but it should be explicit.

Set the reminders before the first send. A client who usually sends early may need one reminder; a client who is always late may need three. The schedule should stop when the documents arrive.

Do not rely on the preparer to remember who is late. The reminder should come from the same system as the request, so the status is visible to the whole team.

Review for missing items before the return

Before the preparer starts the return, check the organizer against the prior-year return and the income documents the IRS has on file. A missing W-2 or 1099 is easier to find in February than in April.

Keep a missing-items list by client. The list should say what is missing, who is waiting on it and the date the client was last asked.

Send the missing-items list to the client as a short, specific request, not a repeat of the whole organizer. A client who sees one missing item is more likely to send it than a client who sees the entire list again.

Handle late K-1s and extensions

Some documents arrive late by nature: K-1s from partnerships, corrected 1099s, brokerage composite statements and trust distributions. Mark those clients as waiting on a specific document, not as unresponsive.

If the document will not arrive before the deadline, file an extension and tell the client what the extension does and does not do. An extension moves the filing date, not the payment date.

Keep the clients who are waiting on a document in a separate list from the clients who have not sent anything. The two groups need different follow-up.

Measure the season and change one thing

At the end of the season, count the organizers sent, the clients who completed them without a reminder, the average days to complete and the returns extended because of a missing document.

Pick one thing to change next year: the organizer, the send waves, the reminder schedule or the client list. A firm that tries to change everything at once cannot tell what worked.

Write the change down before the next season starts. The memory of the season fades by June, and the same problems return in December.

Questions about this guide

When should a firm start preparing for tax season?

Start in November or early December with the client list, the organizer and the send schedule. The first organizers can go out in early January, after the prior-year filing is complete and the new tax year's forms are available.

Should a firm send every organizer on the same day?

No. Sending in waves over the working days the firm chooses spreads the client questions and the document uploads. It also gives the preparers a steady flow of work instead of a January pile.

How many reminders should a client receive?

Enough to match the client's history and the document deadline, and no more. A client who usually sends early may need one; a client who is always late may need three. The reminders should stop when the documents arrive.

When should a firm file an extension?

File an extension when a document the firm needs will not arrive before the deadline, or when the client has not provided enough information to prepare an accurate return. The extension moves the filing date, not the payment date.

How should the firm handle clients who never respond?

Keep them on a separate follow-up list, with the date of each request and the next step. Do not keep sending the same organizer; try a different channel or a phone call, and document the attempt.

Sources

Checked November 3, 2026. Public pages and tax rules change; confirm them before relying on them.

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