How Modern Accountants Automate Client Onboarding in 2025

How modern accountants automate client onboarding in 2025

Omid G](/content/blog/author/omid/index.html) Jun 26, 2025

Differentiate your accounting business with a white-label portal that gives your clients a one-stop shop to access dashboards, submit tickets, send messages, make payments, and more.

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You just signed your latest accounting client. Congrats!

Now, it’s time to get serious and create an unforgettable onboarding experience that will set you apart from other accountants.

However, what many firms get wrong is that they still handle client onboarding for accountants the old-fashioned way. There are endless email chains to collect documents, phone calls, and manual contracts being sent back and forth. And honestly, it doesn't make the best first impression.

But what if you could automate most of your client onboarding process? What if your new clients could upload their documents, sign contracts, and get started — all without you having to do anything until it's time to actually do the accounting work?

That's exactly what we're going to cover in this post. I'll walk you through six simple steps to automate your entire client onboarding process using modern tools and workflows that will save you hours every week and make your firm look incredibly professional.

By the end of this article, you'll have a system that works while you sleep, impresses your clients, and frees up your time to focus on actual accounting.

Alright, let’s get started.

What is onboarding in accounting?

In accounting, client onboarding is a series of steps you go through with every new client that decides to work with you. This typically includes you collecting your clients’ tax returns, business expenses, getting contracts signed, setting expectations, and giving your client access to the systems you’ll use to communicate, share documents, and manage their financial records.

It’s your chance to create an unforgettable first impression and lay the foundation for a long-term relationship. And when done right, your onboarding builds trust, improves your client retention, and shows clients that you run a professional, modern firm.

In the rest of this article, I’ll walk you through how to automate each part of this process, so you can onboard clients faster, stay organized, and spend more time doing actual accounting work.

6 steps to automate your client onboarding as an accountant

Here are six steps to client onboarding for accountants:

Let’s go over each one.

1. Use a client portal platform

The first step to automating your client onboarding as an accountant is to use a client portal software. This is how you're going to automate not only just your onboarding but many different parts of your entire client experience.

I already wrote a post on some of my favorite client portal tools, but for the sake of this article, we're going to use my favorite one that I've been using for my own agency: Assembly.

Assembly is a widely used platform, especially for accountants and bookkeeping firms, and it's a great way to create a secure portal that gives your clients a one-stop shop to upload files, sign contracts, send messages, pay invoices, and a ton more.

It can integrate with platforms like QuickBooks or Zapier, so you can integrate your existing tech stack into the platform.

It's great when it comes to client onboarding because of its automation features that allow you to create different triggers when clients are created. For example, when it comes to your client onboarding process, you can create triggers for when somebody creates their own account through their client portal that then automatically sends them a welcome message or an intake form so you can quickly onboard clients without a lot of back and forth.

On the client experience side, your clients using a platform like Assembly is great because it makes your accounting firm look professional. I don't know about you, but I've personally worked with a few different accounting firms for my own agency, and many of them don't use software, and it's quite a headache to constantly go back and forth on the phone or even through email. And even a lot of times, I don't feel safe uploading sensitive documentation through email.

But through Assembly, everything is secure and your clients can easily upload documents, and you can download them and view them (and vice versa).

If you want to learn a little bit more about why I love Assembly for accounting client portals, you can check out Jason Staat's video here:

Accountants: Here's How to Build A Custom Client Portal 👀 - YouTube

If you’re a fan of Jason’s work, you can also check out his Assembly template, designed specifically for accounting firms.

Assembly is free to start using, so I highly recommend you play around with the accounting demo portal. And once you've signed up, we can go on to step two where we'll begin creating our client onboarding workflow.

2. Set up an automated intake form with triggers

Once you’ve got your client portal set up, the next thing you’ll want to do is build an intake form. This is one of the easiest ways to start automating your onboarding process—and it saves you from sending the same “Hey, can you send me XYZ?” emails over and over again.

Inside Assembly, you can create custom forms that collect all the info you need up front. Things like business details, entity type, service needs, deadlines, and any other important context that helps you hit the ground running.

If you want some inspiration, I actually rounded up a few great intake form examples you can borrow from. And if you’re brand new to intake form automations, we also have a guide on how to set up automated intake forms that walks you through it step-by-step.

Once that form is submitted, you can trigger follow-up actions automatically. For example, you can send a welcome message, notify your team, or even kick off the next step, like sending over a contract for e-signature (which we’ll get into).

You can also create different forms for different services. So if someone’s signing up for bookkeeping vs. tax prep, they’ll only see the questions relevant to them, and get routed into the right onboarding flow.

The goal here is to take your time back from onboarding, while also giving your clients a sense of control. No more email chains. No more confusion. Just a clean, streamlined system that works behind the scenes while you go out to find more clients for your firm.

Next, you want to create a welcome message so when the time comes to invite your clients, they automatically see your message and know what steps to take.

3. Kick off communications in your client portal

The next step is to create a welcome message that automatically shows up inside your client’s portal when they log in for the first time.

Inside Assembly, you can do this using the Messages App, which lets you send direct messages to clients and even automate them based on different triggers. For onboarding, I like to create a message that goes out as soon as a client account is created or once the intake form is submitted.

You can also add links directly to the form, contract, or even a Loom video if you want to walk them through what to expect.

This message is what kicks off the client relationship. It sets expectations, guides your client on next steps, and shows them you’ve got your systems together.

Next, we’ll look at how to invite your client into their portal and complete the full loop.

4. Invite your client to their dedicated portal

Now that you have your intake form and welcome message ready to go, it’s time to actually invite your client into the accounting portal so they can get started.

This is easy to do with Assembly, and there are two routes you can take.

The first one is to manually create a new client profile, and from there, you can trigger everything automatically — send the intake form, show the welcome message, assign them to a segment, whatever you need. If you want a quick walkthrough, here's a step-by-step guide on how to create clients inside Assembly.

Or, if you want to make it even more hands-off, you can send your client a link so they can sign up on their own. This is perfect if you're embedding the portal into your website or just want to simplify the process on your end.

I personally would start with the first one, manually adding clients. Once you do this a few times and everything in your onboarding process is smooth (as in, no complaints or confusion from your clients), then you can start to switch over to the second route.

If you're a visual learner (like me), here’s an interactive walkthrough where you can try out the manual client creation flow yourself:

5. Get your contracts e-signed

After your client joins the portal and fills out their intake form, the next step is to send them your contract or service agreement. But instead of emailing over a PDF or having to pay for DocuSign, and waiting days for a signature, let’s just automate it.

Assembly has a built-in Contracts App that makes it super easy to send documents for e-signature directly through the client portal. Your client gets notified, they open the document, sign it digitally, and boom, it’s done. No need to integrate with third-party e-signature software.

If you're new to e-signatures or just want to know how it all works behind the scenes, we’ve got a quick guide on what an e-signature is and how it’s legally binding. Spoiler: Yes, it holds up just like a handwritten signature, and honestly, most clients prefer it.

You can learn more about Assembly’s e-signature features here, but the short version is: you can upload a contract template, fill in dynamic fields like client name or company name, and send it out in just a few clicks. You can also trigger contract delivery automatically after an intake form is submitted or after you manually add the client.

6. Generate automatic invoices with subscriptions

Once your contract is signed, it’s time to get paid. And the best way to do that? Set up automated billing so you’re not manually creating invoices every month.

Inside Assembly, you can use the Billing App to create one-time invoices or set up recurring subscriptions that automatically charge your client on a set schedule (monthly, quarterly, or annually). You can also link up your Billing products in Assembly with QuickBooks using Assembly’s QuickBooks integration.

At the end of the day, building a systematized client onboarding experience is all about setting the right tone for a long-term client relationship.

Accounting firms who invest in better systems before tax season see the difference: less back-and-forth, smoother client communication, fewer errors when handling financial data, and ultimately, better client retention.

Assembly gives you the tools to make that happen. From the moment a client signs up to the day you’re reviewing their financial records, you can build a process that feels professional, consistent, and easy to manage.

Happy onboarding!