Walk into any 50-person CPA firm and ask the partners what they wish Karbon did better. Chances are you’ll get a pretty long list.
- The folder structure that their tax team has used for fifteen years.
- AR follow-ups should be escalated by client tier, not simply by the top clients, by days outstanding.
- Simply, the extension tracker reports to make sure everything is filed or extended by March/April 15.
- Make SharePoint folder permission mirrors Karbon’s Client Teams, not just fixed by the Department.
- The client profitability and staff productivity reports that the managing partner wants to see on Monday morning.
You know the relevant data is in the system, but the function isn’t there. As expected, this gap is natural, since Karbon, as a product company, serves thousands of other CPA firms, each with its own way of doing things. No software vendor can shape its whole platform to fit any single firm’s exact way of operating. As a result, most firms bridge the gap with practical workarounds: Excel exports, double data entries, a few well-designed templates, manual workflows, etc. Most firms still run on these workarounds for years.
What Most Firms Don’t Realize They Already Own
However, there’s another path most firms haven’t seen, because it sits below the surface. And here’s where Karbon pulls ahead of every other practice management platform in the category: most legacy systems simply don’t have the infrastructure to support this layer. CCH Axcess has parts of it. Thomson Reuters doesn’t. Karbon has all three pieces, and that’s the part most partners haven’t realized their firm already owns. Karbon’s API infrastructure (its public API, real-time webhooks, and AI-readiness) is the iceberg beneath the surface. It’s what enables firms to operate at higher leverage and build the workflows that actually work precisely the way they need. This article is about what’s down there, and why the decision to use it belongs to the firm’s leadership, not to IT.
Three Steps Every Karbon Firm Takes — and the One Most Stop Short Of
Step one is adopting Karbon: getting people, work, and email into one place. That’s the big obvious win every firm talks about. Modern interface. Feature-rich platform. Karbon solves many traditional problems right out of the box: time entry, billing, workflow management, basic operational reports, budget vs. actual, and email triage. All in one place.
The second move is turning on the native marketplace integrations: Xero, QuickBooks Online, Ignition, Stanford Tax, and the rest. Useful. Fast to enable. Most firms are happy to get here and assume they’ve done the integration work.
Step three is Karbon’s API infrastructure, and it’s the step most firms haven’t taken yet, partly because it’s quieter than the first two, partly because it’s harder to see what’s possible until you’ve seen some good examples. This is where firm-specific workflows live, where the gaps Karbon’s marketplace doesn’t cover get closed, and where the firm stops adapting to the software and starts making the software adapt to the firm.
The rest of this article is about step three.
Three Trump Cards Beneath the Surface
In contrast, most CPA firms run on practice management platforms that haven’t changed much in the past 20 years. Karbon is the exception, and the three components of its API infrastructure are what set it apart from every other platform in this category.
Trump card one: a public API
An API is what lets you tell Karbon to do something (create a client, update a work item, log a time entry) without anyone clicking through the user interface. Specifically, Karbon’s API has been public since 2019. To put that in context: CCH has an API but requires additional purchase per module, which can quickly add up and create a barrier for smaller firms. Thomson Reuters UltraTax CS doesn’t offer a public API. Notably, this openness isn’t typical for the category. It’s a deliberate choice that gives firms a real lever that the others don’t have.
Trump card two: real-time webhooks
A webhook is Karbon raising its hand the moment something changes: a new contact, a status update, a custom field edit. More precisely, Karbon sends a small message to the location you specify, in real time. Your other systems stay automatically in sync with Karbon. In fact, most practice management platforms don’t have webhooks at all. Axcess has a real-time API but no webhook system — meaning your firm has to poll CCH to find out what changed, rather than CCH telling you. Karbon firms get the event the second it happens.
Trump card three: MCP-readiness
Model Context Protocol (MCP) is a new standard, published in late 2024 and now supported by every major AI platform, that lets an AI assistant operate software directly. With an MCP server for Karbon, a partner can type in plain English — “Draft a weekly status update for every client whose return is in review and post it to their Karbon work item” — and watch it happen. Moreover, this matters because using the API has historically required a programmer. MCP changes the day-to-day pattern: once an MCP server is in place, the firm uses natural language. We built an MCP server for Karbon in our lab; it works, and we’ll release more details in a future article.
A public API. Real-time webhooks. AI-accessible automation through MCP. By comparison, most of Karbon’s competitors have one of these. Some have none. Karbon has all three, and that’s why step three is so much further along on Karbon than it is on anything else in this category.
What This Looks Like in a Real Firm
A mid-sized US CPA firm we work with wanted every new Karbon contact to automatically receive a SharePoint folder structure with more than 40 subfolders, organized in the firm’s specific way. They wanted the SharePoint URL written back to the Karbon contact record. They wanted team-based permissions synced automatically whenever the Client Team on a contact changed. Crucially, none of that is what the native Karbon-SharePoint marketplace integration is designed to cover.
We built it on the Karbon API and webhooks, with Microsoft Graph API on the SharePoint side. For a new contact, the folders are created within seconds. Additionally, on a Client Team update, permissions sync, and an email confirms it. Staff stopped manually creating folders. The firm freed up the time it used to spend coordinating “Did anyone set up the folders yet?”
To illustrate the next layer: bringing MCP into the picture means a partner can ask the firm’s AI assistant (in natural language) to draft client status updates, surface overdue work items, or summarize the team’s week, all within Karbon.
What Partners Should Take From This
Three takeaways, none of them technical.
- Karbon’s API infrastructure is a firm-level asset, not an IT one. Specifically, it changes how much of your operations you can shape, and how much depends on what Karbon ships. That’s a partner conversation.
- Beyond ownership, it is also a shared firm resource. Karbon allows one webhook subscription per entity type per tenant, which means that two parallel projects can’t each have their own webhook listener; they share the same listener. Naming an owner for the firm’s API and webhook strategy is the kind of decision that’s easy to make today and uncomfortable to make later.
- MCP is the bridge between the API infrastructure and your team. Until now, capturing the value of the API required a programmer. With MCP, the day-to-day usage is natural language. The building and the firm-level governance still require a partner, but the daily payoff goes to the staff.
The Reframe
At its core, this infrastructure isn’t technology. It’s the boundary between the firm Karbon imagines and the firm you actually run. In practice, every CPA firm above a certain size finds there’s a distance between the two. Ultimately, the interesting question is what a firm decides to do about it.
Karbon is the rare practice management platform where the tools to close that distance (API, webhooks, MCP) are all available, integrated, and shipping today. Step one is Karbon. Step two is the marketplace. Step three is where your firm’s real roadmap lives, and where the platforms underneath your competitors don’t reach.
FAQ Section
Q: Can my firm build workflows that Karbon doesn’t offer out of the box?
Yes. Karbon’s public API, real-time webhooks, and MCP-readiness allow firms to build firm-specific automations that the standard product and marketplace don’t cover. Examples include custom SharePoint folder structures tied to client teams, automated permission syncing, and AI-assisted status updates — all running inside Karbon without manual handoffs.
Q: How much does it cost to build on Karbon’s API?
The API access itself is included with Karbon. The investment is in the build — scoping, development, and ongoing governance. The offsetting gain is capacity: manual handoffs that consumed staff hours get replaced by automations that run in the background. Silver Sea typically scopes these builds for mid-size firms in an initial discovery call.
Q: What happens to these workflows if we switch away from Karbon?
The integrations built on Karbon’s API are firm assets, not Karbon’s. The logic, the SharePoint structures, and the automation rules live in your environment. They would need to be rebuilt for a different platform — which is worth factoring into any platform evaluation.