Tax-season paperworkSorted playbook for accounting practices

Every January, the same thing happens. The first returns are due soon, half your clients haven't signed this year's engagement letter, three need a fresh 8821 before you can pull transcripts, and someone's organiser is still in a drawer at their house. You spend the first two weeks of the season chasing signatures instead of preparing returns.

This playbook moves that work to the quiet weeks before the season: one pre-season pack per client, filled from records you already have, sent in bulk with reminders. It's written for small and mid-size US practices, with notes for Australian firms at the end.

This is general information, not tax or legal advice. Check the current IRS and ATO guidance for your practice.

What should be in the pre-season pack?

A typical pre-season pack has four parts: an engagement letter for the coming season, an IRS authorization (Form 8821 or Form 2848), a W-9 or W-8BEN where your firm or a client needs one, and your tax organiser. Send them together, weeks before the season, so signatures are done before preparation starts.

Our W-9 vs W-8BEN guide covers which form a client needs. Note that a W-8BEN is given to the withholding agent, not to the IRS (IRS instructions (opens in a new tab)).

How do you draft the engagement letter once?

Write one engagement letter template for each service line, with your firm's fixed details built in and fields for each client's name, entity, services and fees. Review it once with a partner, then reuse it for every client. Changes for a specific client go into that client's copy, not the template.

What the template should fix, and what it should leave as fields:

• Fixed (same for every client): firm name, address, partner names, standard terms, your privacy wording.
• Fields (filled per client): client or entity name, tax years, services in scope, fee or fee basis, signer names and roles.
• Optional clauses: extra services, such as bookkeeping or payroll, switched on per client.

AppliFlo's Docs is built for this. You can import your existing Word letter, draft or review clauses with AI, keep reusable clauses in a library, and set fixed sender values so your firm's details are filled in the same way every time. Then send the letter for signature from the same place.

How do you fill 8821s and 2848s from client records?

Fill each client's authorization from the details you already hold: name, taxpayer ID, address, the tax types and periods, and your designee or representative details. Review the filled form, then send it for signature. Both forms can be submitted online at irs.gov, where electronic signatures are accepted.

The difference, in the IRS's own words:

• Form 2848: "Use Form 2848 to authorize an individual to represent you before the IRS" (IRS (opens in a new tab)).
• Form 8821: authorizes a designee "to inspect and/or receive your confidential information verbally or in writing" for the tax types and periods listed (IRS (opens in a new tab)).

Our Form 2848 vs 8821 guide goes through who can be named and when to use each.

Signing rules worth knowing: for forms submitted online, the IRS accepts several kinds of electronic signature, including a typed name, a scanned signature and signatures created by third-party software. Forms sent by mail or fax need a wet-ink signature. And if you don't know the taxpayer and they sign remotely, you must authenticate their identity first (IRS: submit Forms 2848 and 8821 online (opens in a new tab)).

AppliFlo's library of 54 official government forms is ready to fill, and any other PDF you use can be uploaded so AppliFlo finds its fields and fills them from the client's record. Fields it isn't sure about are flagged for you instead of guessed.

How do you bulk send the pack with reminders?

Pick your template, load the list of clients from your CRM or a CSV file, and send. Each client gets their own envelope with their own details filled in, plus automatic reminders until they sign. You watch one list of who has and hasn't signed, instead of one inbox per client.

A practical bulk-send routine:

1. Clean the client list. Current email addresses and signer names, especially for entities with more than one signer.
2. Pick the template and map its fields to your list's columns.
3. Set roles and order. For example, the client signs, then the partner countersigns.
4. Set reminders. A first reminder after a few days, then a regular nudge.
5. Send to a test client first. Check the filled fields and the signing experience.
6. Send to everyone.
7. Follow up personally with the last few who haven't signed.

AppliFlo Sign does this with roles, signing in order or in parallel, reminders and bulk send of one template to many clients. Every signed PDF gets a PAdES seal, a certificate of completion and an audit trail of who signed, when, and from which IP address. For the evidence side, see audit trail vs certificate of completion.

How does Form 8879 work at the end of the season?

Form 8879 is the IRS e-file Signature Authorization: the taxpayer's declaration and signature authorization for a return e-filed by an electronic return originator (ERO). The form says the ERO must obtain and retain it and should not submit it to the IRS unless requested. E-signing it has specific identity-verification rules.

The IRS describes Form 8879 as "the declaration document and signature authorization for an e-filed return", used when the Practitioner PIN method is used or the taxpayer authorizes the ERO to enter or generate their PIN (IRS (opens in a new tab)). The form itself reads: "ERO Must Retain This Form... Don't Submit This Form to the IRS Unless Requested To Do So" (Form 8879 PDF (opens in a new tab)).

What should Australian practices collect?

Australian practices usually collect an engagement letter, client identification, tax file number and ABN details, and, for businesses, the client's nomination of the practice as their registered agent through the ATO's online services. Some matters also need statutory declarations, which can now be made digitally or with a witness.

Agent nomination. The ATO's client-to-agent linking process requires businesses with an ABN (other than sole traders) to nominate their registered agent in Online services for business before the agent can act for them; the agent can't nominate on the client's behalf (ATO (opens in a new tab)). Individuals and sole traders have their own process. Include instructions in your onboarding pack.

Statutory declarations. A Commonwealth statutory declaration can be made digitally through myGov, or on the approved form with an approved witness in person or by video link. All three are equally valid, and witnessed declarations can be signed in ink or electronically (Attorney-General's Department (opens in a new tab)).

Sensitive details. Tax file numbers and bank details are sensitive. In AppliFlo, all data is encrypted at rest by Google Cloud (AES-256) and in transit (TLS); tax and bank details you save for Fill as me also get a separate application key. AppliFlo for Chrome fills them on a site only after you confirm.

Common tax-season paperwork mistakes

The costly mistakes are starting the pack too late, using last year's letter without review, sending a 2848 when an 8821 would do (or the reverse), forgetting identity checks for remote signers, and e-signing 8879s outside approved software.

• Late start. Send the pack in the quiet weeks, not the first week of the season.
• Unreviewed templates. Fees and scope change; read the template every year.
• Wrong authorization. Match the form to what you'll actually do.
• Missing countersignature. Set the partner as a signing role so it isn't forgotten.
• 8879 in the wrong tool. Use software that meets the IRS identity rules.
• Scattered evidence. File each signed letter with its certificate in the client record.

For more on how this fits a practice, see the accounting and tax page and the tax engagement page. Pricing is on the pricing page.