Key takeaways
- Test the record a tool keeps after the client signs, not the signature screen.
- Capture every SSN, ITIN and EIN in a dedicated field, never in a message or comment.
- Form 2848 and Form 8821 do different jobs, so collect the form the work needs.
- Ask each vendor whether reminders stop when a request is complete.
What the client record has to hold
For each client, the onboarding record needs five items: the signed engagement letter for the year, a Form W-9 or other TIN record, the IRS authorization for the work, the document request for the services bought, and the reminder schedule. The record is organized by client, service and year.
Can a partner open one client and see the status of all five items without going to email? If the answer needs a spreadsheet beside the tool, the firm still runs a second system.
Failure mode: the 2026 engagement letter is signed, but it sits under the 2025 engagement because the tool attached it to the contact rather than to the service and year. Fix: before any work starts, open the year's engagement and confirm the letter appears there.
Test the TIN capture first
Test how the tool captures SSNs, ITINs and EINs. The test has three parts: a format check that rejects a malformed number before it is saved, a mask after save that shows only the last four digits, and permission limits on who can open the full number. Usual's sensitive ID field checks SSN, ITIN and EIN format and shows the last four digits after save.
Use a file upload for the Form W-9. The IRS describes Form W-9 as the way to give the person who must file an information return with the IRS the correct Taxpayer Identification Number. The IRS instructions for the requester of the form are dated 03/2024, so confirm that the tool sends the March 2024 version and not an older PDF.
Send the client this line: “Please upload a signed Form W-9 through the secure link below, and do not type your SSN or EIN into a message or comment.” The line keeps the number out of the thread.
Failure mode: a client types an EIN into a comment, and the comment travels with the client file when the file is exported. Fix: delete the comment, change the answer field to text that rejects numbers, and reissue the request as an upload.
Authorization forms and their clocks
Form 2848 and Form 8821 are not interchangeable. The Form 2848 instructions say that representatives are not authorized to endorse or otherwise negotiate any check, and that the representative must sign within 45 days from the date the taxpayer signed, or 60 days for a taxpayer residing abroad. Form 8821 does not authorize the designee to speak on the taxpayer's behalf, to advocate the taxpayer's position on federal tax laws, or to represent the taxpayer before the IRS.
Decision rule: if the firm will call the IRS or sign as representative, collect Form 2848. If it only needs transcripts or account data, such as for a lender, collect Form 8821.
The clock differs by form. On Form 2848, the IRS will not record on the CAF system any future tax years or periods that exceed 3 years, counted from December 31 of the year the IRS receives the form. On Form 8821 used for a purpose other than resolving a tax matter, the IRS must receive the form within 120 days of the taxpayer's signature date.
Worked example: a client signs Form 8821 for a mortgage lender. The lender's request reaches the firm 100 days after the signature date, which leaves 20 days in the window. If the form does not reach the IRS in time, the client has to sign a new one. Set the reminder from the signature date, with the first warning at day 90, not from the day the form is received.
Use conditional requests and test Not applicable
A client who buys only monthly bookkeeping should not see a question about Schedule K-1. Test whether the tool can show or hide a field, a section or a whole page based on an earlier answer, combine conditions with AND and OR, and leave hidden required fields out of the completion count. If a hidden required field blocks submission, every client who skipped a service stops at the same question.
Test the repeatable section too. A client with three employers needs three entries for the W-2 questions, not a note that says see attached. Usual's repeatable sections go up to 20 entries, which covers most clients with several employers or rental properties.
Not applicable needs its own answer. A client with no K-1s should click Not applicable, add an optional reason, and have the item count as complete. A tool that accepts only uploads pushes the client to upload a blank note, and the item stays open.
Example: a request has 40 items, 12 of them conditional on services. For a bookkeeping-only client, the 12 tax items are hidden, so the progress count should read 28 of 28 when the client finishes, not 28 of 40.
Match the access level to the data
A link alone is enough for a request to upload bank statements. For a request that carries an SSN, a W-9 or a signed authorization, require a one-time passcode sent to email or phone, and apply the passcode to that request only.
Test the reminder schedule. It should send a set number of reminders before and after the due date, stop when the item is complete, and let the firm preview each message before it goes out. Test whether the tool alerts an owner when reminders go unanswered. A tool that cannot stop a reminder for a completed item will ask for a W-2 the client already uploaded.
Use the right tax year for every rule
Onboarding for 2026 returns, which are filed in 2027, runs into a threshold that changed. The IRS FAQ on Form 1099-NEC shows $600 for payments made during the calendar year, and $2,000 for payments made after December 31, 2025. For 2026 payments, use $2,000. A vendor paid $700 in 2025 was above the old $600 threshold for 2025 payments. A vendor paid $1,500 in 2026 is below the $2,000 threshold, subject to the exceptions in the instructions.
Form 1099-NEC must be filed and furnished by January 31 under the IRS instructions. A due date that lands on a Saturday, Sunday or District of Columbia legal holiday moves to the next business day, so check the 2027 calendar before you set the reminder.
For calendar-year individual filers, the IRS lists April 15 as the due date for Form 1040. The page shows April 15, 2026 for tax year 2025, so build the tax organizer reminder for the 2026 return from April 15, 2027, not from last year's calendar.
Questions to put to each vendor
Use these questions in the demo and write down each answer. First, which Form W-9 revision does the tool send, and can the client upload it as a file? Second, does the SSN, ITIN or EIN field reject a malformed number before save, and does it show only the last four digits afterward? Third, can an authorization carry a signature date that drives a reminder? Fourth, is the signed engagement letter saved to the client's engagement for the year, with a version history if the template changes?
Fifth, can a question depend on an earlier answer, with a Not applicable option that counts as complete? Sixth, do reminders stop when an item is complete, and does the tool alert the owner when reminders get no response? Seventh, where is the data stored, and who can export it?
Failure modes and their fixes
Duplicate requests. The W-2 request goes out in January and again in March, because it is attached to the contact instead of the year. Fix: one request per client, service and year. Copy last year's questions, not last year's answers.
Vendor with no W-9. A contractor is paid in 2026 with no form on file, and each later payment makes the chase harder. Fix: request the W-9 before the first payment, and follow the steps in the guide on collecting 1099 and W-9 information.
Lapsed authorization. A Form 2848 or Form 8821 is used after its window has closed or for a year it does not cover. Fix: store the signature date and the scope of each authorization as fields, and review the list before each filing season.