Same form. 40 clients. The same 15 fields, every time.
W-9s for every new vendor, engagement letters at year-end, intake forms for every new client — all asking for the same data. JustFill fills them all from one spreadsheet.
The current busy-season grind
- ✕Re-typing the same client name, EIN, and address onto W-9 after W-9, engagement letter after engagement letter.
- ✕5–10 minutes per client per form — multiplied across your whole client book at year-end.
- ✕Print → sign → scan loops on flat PDFs that won't accept your data export.
- ✕A typo'd EIN means a redo — and an awkward email to the client.
After your first batch
- ✓One spreadsheet fills every client's form: import your client list, get one PDF per row.
- ✓A whole client book filled in one pass — then exported as a single ZIP of PDFs.
- ✓Review every field before you send: see each filled PDF on screen, fix anything, approve.
- ✓Save the layout as a template: next quarter and next tax season are even faster.
ROI Calculator
What's the same-form-every-client tax on your practice?
Drag the sliders to estimate the monthly hours and dollars freed up by batch-filling recurring client forms.
Estimated monthly impact
After JustFill Starter plan cost ($19/mo)
Three steps. Whole client book filled.
Get going on your first batch in the same session. No setup call required for federal forms.
1. Upload the form once
Drop the recurring form (W-9, engagement letter, client intake, 1099 backup withholding). AI detects every field in seconds — even on flat or scanned PDFs.
2. Import your client spreadsheet
Export your client list from QuickBooks, Xero, or a Google Sheet. One row per client. JustFill maps each column to the right field — download a perfect-fit CSV template if you want.
3. Download a ZIP of filled PDFs
One PDF per client, all filled in one pass. Review each on screen, approve, and export the whole batch as a ZIP. Save the layout as a template — next period is even faster.
Supported forms
Pre-built templates for the forms you fill most
Each federal form has a dedicated detection profile — JustFill knows where every field lives the first time you upload it.
TIN Certification (IRS) — collected from every 1099 contractor and vendor before payment.
Open the Form W-9 pageEmployee's Withholding Certificate (IRS) — for client payroll onboarding.
Open the Form W-4 pagePower of Attorney (IRS) — authorize your firm to represent a client before the IRS.
Open the Form 2848 pageIVES Request for Transcript (IRS) — income verification for lending and review work.
Open the Form 4506-C pageApplication for a Social Security Card (SSA) — for clients applying for or correcting an SSN.
Open the Form SS-5 pagePlus any firm or client-specific PDF
Why practices pick JustFill
Built for the forms you fill again and again
One spreadsheet, every client
Import an Excel or CSV with one row per client and JustFill fills a separate PDF for each — name, EIN/SSN, address, entity type all land in the right place. No copy-paste per client.
Save the layout once, reuse forever
The first time you fill a form, JustFill learns where every field sits. Next quarter, next tax season, next new client — re-fill from one paste or one spreadsheet in seconds.
Works on any client PDF
Federal forms, your engagement letter, a state registration PDF, a scanned form a client emailed you — JustFill reads any flat PDF visually. No fillable fields required.
Free trial or concierge pilot
Start with one form. Decide if it's a fit.
Most practices start with our free tier (50 credits) and upgrade to Starter ($19/month) — or grab pay-per-use credit packs for busy season — once they've batch-filled their first stack of client forms. Want us to set up your top recurring form and spreadsheet template? We'll do it for you.
Batch setup
For practices with recurring client forms
- Batch setup for your top recurring form (W-9, engagement letter, or intake)
- A perfect-fit spreadsheet template mapped to your client data export
- Saved layouts so next period fills in minutes, not hours
- Strict data privacy: client PII auto-wiped after each session by default
- Priority support and unlimited template edits during the trial
Trust & privacy
Built for client PII
Bookkeepers and accounting practices use JustFill to take the typing out of recurring client paperwork.
Human review before download
JustFill prepares a draft on the visible PDF. You review every field on screen before download. No data is sent directly to the IRS, SSA, or any agency — the completed PDF leaves your hands for signature and filing through your normal channel.
Client data privacy
SSN, EIN, and address details are processed in-session and not used to train AI models. Default retention auto-wipes uploaded PDFs and imported spreadsheet data when your session ends. DPA available on request.
JustFill is an independent draft-preparation tool. We are not affiliated with, endorsed by, or sponsored by the IRS, SSA, or any other government agency, nor with any accounting-software vendor. Forms referenced above (W-9, W-4, 2848, 4506-C, SS-5) are public-domain US federal forms; we provide a fillable interface only. JustFill does not provide tax, legal, or accounting advice. Always use the latest official version from the issuing agency's website.
FAQ for bookkeepers & accountants
Common questions from firm owners, staff accountants, and tax preparers.
- How is this different from my accounting or tax software?
- JustFill is a draft-preparation layer that sits before signature. QuickBooks, Xero, Drake, or your tax suite manage the books and filings — but most still leave you hand-typing W-9s, engagement letters, POAs, and client-specific PDFs. JustFill replaces that typing step. It does not store client data long-term or replace your accounting platform.
- Can I really fill one form for all my clients at once?
- Yes — that's the core workflow. Upload the form once, import a spreadsheet with one row per client (export it straight from QuickBooks or Xero), and JustFill produces one filled PDF per client in a single pass. You review each on screen, then download the whole batch as a ZIP.
- Do you file forms with the IRS or SSA?
- No. JustFill prepares filled PDFs for you to review, sign, and submit through your normal channels. We are not an e-filing provider, e-signature platform, or tax advisor. Every form leaves with a human review.
- What about client data privacy and SSN/EIN handling?
- Client PII (SSN, EIN, address) is processed during the session and is not used to train AI models. Default retention auto-wipes uploaded PDFs and pasted/imported data after the session. We offer a signed DPA on request and follow least-retention defaults.
- Will this work on our engagement letter and firm-specific PDFs?
- Yes. JustFill reads the visual layout of any flat PDF — there's no whitelist. Federal forms (W-9, W-4, 2848, 4506-C, SS-5) have pre-built detection profiles; your engagement letter or intake form gets a one-time setup the first time you fill it, then becomes a reusable template.
- How many forms can I fill in one batch?
- Up to 100 rows per batch in the spreadsheet import. For larger client books, split the export (for example by client group or month) and run them one batch at a time. Each batch exports as a single ZIP.
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