How to Build a Client Portal: A Complete Guide for 2026

TL;DR: To build a client portal, start with the two or three tasks clients email you about most, like document collection and invoice status, then choose off-the-shelf client portal software for a standard process or a custom build for unique workflows. Link every record to a client, set permissions at the database level, add document requests, invoices, and dashboards, and test data isolation with dummy client accounts before you pilot with a small group.

It’s month-end close. One client just emailed you a pile of receipts, and another wants to know if you ever got their signed engagement letter. By lunch, your team has spent more time digging through inboxes than doing the work clients pay for.

A client portal gives each client one place to drop off files and see where their work stands. In Rightworks’ 2026 survey, 88% of accounting firms said they already send documents through a secure portal. It’s also safer than email, and breaches aren’t cheap: IBM puts the average at $4.99 million.

This guide covers the whole build. First you’ll figure out what your portal needs to do, choose between off-the-shelf software and a custom build, and map the data it tracks. Then you’ll set up logins and permissions, add file sharing, invoices, and dashboards, and make sure each client sees only their own data before launch.

What is a client portal?

A client portal is a secure, branded website or app where each client logs in to see their own documents, project status, invoices, and messages. To build one, you decide what clients need to do, choose a platform, set up your data and permissions, and test with a small group before launch.

In practice, a portal handles the questions clients would otherwise email you. Most clients log in for four things:

• See where things stand: They can see their monthly close is underway and due Friday, without emailing to ask.
• Swap files: They drop off receipts and grab finished work, like this month’s financial report.
• Pay invoices: They see what’s due and pay it without hunting through old emails.
• Ask questions: A question about the quarterly close stays with that project, so anyone on your team can pick it up.

Accounting and bookkeeping firms use client portals, and so do consultants, agencies, and law firms, each for a slightly different main job. A client portal for agencies is mostly about approvals, like a client signing off on a homepage design, while a bookkeeping portal is mostly about collecting receipts.

A shared folder can handle the file swapping, but status updates, invoices, and questions still end up in your inbox. A portal keeps all four in one place.

How do you decide what your client portal needs to do?

Start with what clients should be able to do on their own, then pick the kind of tool that fits.

List the tasks clients handle without emailing you

The easiest way to scope a portal is to look at what clients already email you about. Every question that keeps coming up is a job the portal can handle instead.

• Sort last month’s client emails: Tag each one by what the client wanted, like “sent a file,” “asked about status,” or “asked about an invoice.” The tags that show up most become your first features.
• Launch with two or three tasks: Document collection and invoice status are a good place to start, since they cover the files and billing questions clients send most. Booking and approvals can wait until clients are actually using the portal.
• Decide how you’ll measure it: Pick metrics you can track, like fewer “Did you get my file?” emails and documents showing up sooner.

Compare client portal software with a custom build

The right choice depends on how standard your workflow is, where your client data lives today, and how much control you want over permissions, branding, and future changes.

Two common situations make the choice easier:

• Client portal software fits a standard process. If your firm mostly prepares individual tax returns, tools like TaxDome or Karbon already include document requests, e-signatures, and billing, so you’ll spend your time on setup instead of building.
• A custom client portal fits work that doesn’t match a template. That might mean a white-label client portal on your own domain, a B2B client portal where each company has several contacts, or one build that covers web and mobile.

If a custom portal fits, you don’t have to start from a blank page. On Bubble, you describe your portal to the Bubble AI Agent, and it asks clarifying questions and drafts a blueprint with you before it builds anything.

Then it generates the pages, database, and workflows, plus core flows like signup and login. It sets up privacy rules for each data type and adds sample data so you can test right away. Because every part is visual, you can see what the Agent built and change any of it yourself.

Whichever way you go, the next step is the data and permissions underneath your portal.

How do you set up client logins, data, and permissions?

Clients never see this part, but it’s what keeps each client’s records away from everyone else.

Map your client portal data model

A data model is the list of things your portal keeps track of and how they connect. It works like a set of linked spreadsheets, where each row points to the record it belongs to. Most client portals start with six kinds of records:

• Clients: The person or company you work for, plus billing details. Everything else links back here.
• Contacts: The people who log in for that client, like a business owner and their office manager.
• Projects: The work you’re doing for them, like a monthly close or a year-end review.
• Documents: Each file and its status, like requested, uploaded, or approved.
• Invoices: What they owe, tied to the right client and project.
• Messages: Questions and replies attached to a project, so the history stays with the work.

Because every record points back to a client, the permissions you set next can keep each client’s data separate.

Set up client logins and roles

A role is a set of permissions for one type of user, and it decides what that person can see and do.

• Client user: Sees only their own company’s records. Their office manager can view the company’s invoices and nothing else.
• Firm staff: Sees only the clients assigned to them. A bookkeeper with 12 clients sees those 12, not the whole firm’s list.
• Firm admin: Manages everything, including settings, roles, and setting up new clients.

Email and password logins are enough for most firms to start. Larger B2B clients may ask for single sign-on (SSO), so their team can log in with the work account they already have. On Bubble, you can add SSO through the WorkOS plugin or the API Connector.

Rather than letting anyone sign up, send each client contact an invite. The invite links their account to the right client, so their permissions work the first time they log in.

Make sure each client sees only their own data

To keep Client A from ever seeing Client B’s records, set permissions at the database level. That way, every search, list, file, and dashboard only shows records that belong to the client who’s logged in. Hiding part of a page doesn’t protect anything, since the data is still there for anyone who knows where to look.

Some fields need extra protection. A client might see an invoice but not your internal notes or pricing calculations on it. Files need the same care, so only share file links with the people who should have them, never as public URLs.

On Bubble, these permissions are called privacy rules. You set them visually for each data type, down to single fields and attached files, and the Agent creates them for every data type it builds. The Bubble Manual’s guide to protecting data with privacy rules shows how they work.

Before launch, make uploaded files private and attach each one to the record it belongs to. That way, the record’s privacy rules decide who can open the file, even if someone copies the link. Then do a last check of who can see each record, file, and field before you invite clients.

How do you add file sharing, invoices, and client dashboards?

Now you can build the features clients use every day, all on top of the records you just mapped.

Build secure file sharing and document requests

A document request asks a client for one specific file and tracks it until someone on your team approves it. Here’s how one moves through your firm:

1. Your firm asks for a document, like a signed engagement letter.
2. The client gets a notification and uploads the file to that request.
3. Someone on your team reviews it.
4. They mark it approved, and the client’s checklist updates.

Automatic reminders for missing documents save your team from chasing clients by email. On Bubble, scheduled backend workflows can send them. You can test reminders while you build, but your app needs a paid plan before they reach clients.

A secure client portal also needs the security basics. Use encrypted connections (HTTPS), and limit file access to the right people. Tell clients never to send bank or account passwords through the portal, either.

Show invoices and connect payments

For each open invoice, clients need the amount, the due date, and a way to pay. A clear “Due” or “Paid” label cuts down on billing questions.

If your invoices live in QuickBooks Online or Xero, your portal can pull in what each client needs to see, and a payment provider like Stripe can take card payments. On Bubble, you connect these services through the API Connector or plugins, and the Agent can help set up the API calls.

Build a client dashboard

A client dashboard is a summary page that changes based on who’s logged in. Each client sees their own missing documents, invoices due, and project progress at a glance. You can build one with a no-code client portal builder or an app builder that connects to your accounting data.

• Client view: Shows what’s waiting on them and what’s due, so they know where things stand in a few seconds.
• Staff view: Shows overdue items and clients waiting on a reply, so your team knows who to help first.

Pull financial figures straight from your accounting system instead of retyping them, so the numbers clients see match your books. Every total should come only from the logged-in client’s records, using the permissions you already set. For layout ideas, see the guide on how to make dashboards.

How do you test and launch your client portal?

Before you invite clients, make sure your permissions hold up and the main tasks work. Then roll the portal out a few clients at a time.

Test data isolation with dummy client accounts

Data isolation means no client can reach another client’s records. Run this quick test before any clients log in:

1. Create two fake clients, each with their own projects, documents, and invoices.
2. Log in as each one.
3. Check that you only see that client’s records, files, and dashboard totals.
4. Paste the other client’s document link into your browser and confirm that it’s blocked.

On Bubble’s paid plans, the security dashboard checks your privacy rules and flags issues before you deploy. The Starter plan includes basic checks, and Growth and higher plans add advanced ones, like compromised API tokens and database exposure risks. It can’t catch everything, so keep running your own tests too.

Pilot with a small group of clients

Start with a few friendly, active clients before you move old files over and invite everyone else. Add a short feedback form in the portal, and watch which tasks clients finish and which they skip. Fix whatever trips up your pilot group, then open it up to everyone.

Brand and publish your portal on web and mobile

Add your firm’s logo, colors, and custom domain so the portal looks like yours. Some clients will want a client portal app on their phone too, so they can snap a photo of a receipt or check on their work.

With Bubble for native mobile apps, you build iOS and Android apps from the same editor and backend as your web portal. You also manage builds and submissions to the App Store and Google Play Store from Bubble, though Apple and Google still require their own developer accounts and review. After launch, version control lets you test changes before clients see them, and backup and restore let you return to an earlier version within your plan’s limits.

Build a client portal your clients will actually use

Start building your client portal by thinking about the questions your clients are already asking. Keep each client’s data private by setting permissions at the database level and testing them with dummy accounts before anyone logs in.

On Bubble, your client portal grows with your firm. Everything is visual, from the design to the logic and privacy rules, so you can see exactly who has access to what and change it yourself as client needs change. “Bubble gives us an advantage because anybody can go in and easily understand what’s going on,” says Ezra Gershanok, co-founder of Ohana.

Use AI when you want speed or edit by hand when you want precision. Your web portal and mobile app run on the same backend, with hosting and security included, so you keep building on the portal you launch instead of rebuilding it later.

If you get stuck, the Bubble Manual walks through every part of the editor, and you can read up on how Bubble AI works. If you’d rather have someone else build it, a Bubble agency or a Bubble Developer can help.

Frequently asked questions

What is the difference between a client portal and a customer portal?

A client portal usually serves professional-services clients with ongoing projects, documents, and billing. A customer portal usually serves people who buy a product, with orders, support tickets, and account settings.

How much does it cost to build a custom client portal?

Off-the-shelf client portal software usually charges a recurring subscription. On Bubble, getting started is free (generating an app with the Bubble AI Agent doesn’t use AI credits, up to a monthly cap), and you move to a paid plan when you’re ready to go live.

Is a no-code client portal secure enough for sensitive financial documents?

It can be, if you set up privacy rules, private file access, and authentication carefully and test with separate client accounts. Bubble’s SOC 2 Type II report covers the platform itself, and Bubble’s DPA rules out storing tax returns, government ID numbers, and financial account credentials, so keep those in a dedicated tax tool.

Can I move existing client data into a new client portal?

Yes, many portal tools let you import a spreadsheet or CSV, though the details vary. On a paid Bubble plan, you can upload CSV files to your app’s database from the Data tab once you’ve cleaned up any duplicate clients and contacts.