Client Portal for Accounting Firms

Your clients still attach tax documents to emails. The file bounces at 25 MB. The thread splits into three. The follow-up takes three days and another message asking whether you received it. A client portal built for accounting firms fixes the handoff — every document arrives in one branded space, with a full log of who sent what and when, and no attachment that expires on a Tuesday.

What Does a Client Portal Do for an Accounting Firm?

A client portal is a private, branded web space where clients upload their documents — W-2s, 1099s, bank statements, receipts — and you deliver finished returns, reports, and invoices. Every file exchange is timestamped. Think of it as one dedicated inbox per client, with your firm's name and logo on the front door.

The difference from email is not just security — it is workflow. Attachments do not bounce because of a size limit. Links do not expire after seven days. Each client sees only their own folder; you see all clients from one dashboard. When someone uploads the document you have been waiting on, you are notified immediately. No more did you get the file? threads.

How Your Firm Uses a Portal Through Tax Season

The seasonal workflow breaks into three phases: invite clients to their space, collect source documents, then deliver finished work. Each step is tracked in an audit log — you know exactly when the client uploaded their last W-2 and when they downloaded the final return. For a step-by-step breakdown of the collection phase, see How Tax Preparers Collect Client Documents.

Collect. At the start of each engagement, you send each client an invitation to their own space on your portal. They upload W-2s, 1099s, bank statements, and supporting documents directly — no ZIP files, no Google Drive links, no forwarded emails. Large files upload in resumable chunks, so a dropped connection does not mean starting over.

Work. Your team accesses the documents directly from the portal. No downloading to a local desktop, emailing files internally, and hoping no one is working from a stale version. The files are in one place; the audit log shows who opened what and when.

Deliver. You upload the finished return, the engagement letter, or the invoice. The client receives a notification and logs in to download. The portal records exactly when they opened and saved the file. For compliance, that download log is exportable at any time — and it becomes part of your permanent engagement record.

What to Look for When Choosing a Client Portal

Five things separate a portal built for professional-services firms from generic file-storage tools: a branded experience for clients, per-client access control, a complete download audit trail, the ability to export your data when you switch, and pricing that does not charge you a seat fee for every client who logs in.

• Branding. Your clients should see your firm's name and logo, not the vendor's. A portal that puts its own brand front and center is running an ad on your engagement screen. Look for a solution that puts your name on the login page and in every notification email sent to your clients.
• Per-client access control. Each client should see only their own files. Shared folders in Drive or Dropbox do not enforce this by default — one misconfigured permission and a client can browse another client's financial documents.
• Audit trail. For tax preparers, knowing who accessed which document and when is a compliance requirement, not a nice-to-have. Look for timestamped download logs that you can export to CSV and attach to the engagement file.
• Data portability. Ask the vendor directly: can you export all your files and client data if you switch? If the answer is vague, that is your answer. Your clients' sensitive financial documents belong to you, not the platform.
• Pricing structure. Most per-seat tools charge for every client account. If you have 150 active clients during tax season, that math compounds quickly. Look for plans that meter on active client accounts, not per-client seats — your clients should never pay, and you should not pay for them by the head.

Solo Practitioner or a 10-Person Firm: Which Plan Fits?

The economics look different at each scale. A solo practitioner with a steady roster of 20 to 30 clients needs a low-cost entry point and simple setup. A firm of ten handling 150 returns in a 90-day window needs more capacity, multi-seat access, and an audit log they can rely on year after year.

Solo practitioner. If you manage around 20 to 30 active clients and most of your intake happens in a concentrated season, a free plan lets you pilot the portal with your busiest clients before committing. You can add more active client accounts as your roster grows — and because pricing is based on active accounts rather than seats, occasional extension-period clients do not spike your bill.

A firm of ten. At this scale, you are running 100 to 200 returns across 90 days. You need multiple team members accessing files simultaneously, per-client archives that survive the season intact, and a way to hand off context from one year to the next without rebuilding folder structures. Look at plans that cover 25 or more active client accounts with multiple workspace-user seats and at least a year of audit history. See the full plan comparison to find the right fit for your firm's size.

The IRS Safeguards Rule and Your File-Sharing Setup

The IRS requires all tax preparers who receive, maintain, share, or transmit client tax information to have a Written Information Security Plan (WISP). That plan must cover how client data moves in and out of your practice — including how you share and receive files with every client, every season.

The FTC Safeguards Rule — which the IRS incorporates by reference — requires firms to protect the security of customer financial information. Any system used to transfer client documents needs to encrypt data in transit and at rest, control who can access it, and log that access. Email fails all three of those requirements in a typical small-firm setup: most providers do not encrypt attachments at rest, there is no access log, and once an attachment is forwarded, all control is gone.

A client portal built for professional services handles these requirements by design: encryption in transit and at rest, two-factor authentication enforceable by policy across all client accounts, and a timestamped download log for every file. The AICPA data security resources for tax practitioners consistently point to a secure document-exchange process as a foundational element of a practice's information security posture. See how the portal works end-to-end on the product overview.

ProjectSend Cloud: Hosted by the Team Behind the Open Source

ProjectSend is open source software that has been powering client file portals on self-hosted servers since 2009 — 4.8 million-plus Docker downloads, more than 4,000 active instances, 1,900-plus GitHub stars, licensed under GPLv2. ProjectSend Cloud is the same software, hosted and maintained by the same team. You get the full feature set running on managed infrastructure, with automated backups, SSL, email delivery, and updates handled for you.

The license is GPLv2 — not proprietary, not AGPL. If you ever want to move to your own server, you export your files and client data, point the DNS, and keep running on the open source codebase. No export fee, no proprietary format, no vendor holding your clients' documents hostage. The exit is part of the product — because we built the open source too.

Pricing starts at $0 on the Free plan: a personal account on a shared site with 2 GB of storage, a private link for every file (kept for 30 days), encryption and community support. No time limit. No credit card required. Pro at $19 per month is a portal of your own with 25 active client accounts, 3 team seats and an audit trail — enough for a firm handling several hundred clients in a season. Business at $49 per month adds SSO, enforced 2FA across all accounts, and priority support.

Ready to stop chasing files by email? Start free on ProjectSend Cloud — no credit card, no time limit. Upgrade to Pro or Business when your roster and your team grow.