Karbon integrations_

Karbon integrates with Xero, QuickBooks, Gmail, Outlook, Slack, and Zapier through its native integration library and REST API, built specifically for accounting firms that use Karbon as their practice management hub. Native integrations cover client data sync and email management. For practice workflows that connect the “work complete” moment to accounting, CRM, and client communication from a single trigger, replace expensive SaaS subscriptions, or automate the work-to-cash cycle the native library doesn’t cover, Formulaic builds custom Karbon integrations with no marketplace limits.

Short answer: Karbon has native integrations with Xero, QuickBooks, Gmail, and Outlook for basic data sync. Formulaic builds custom integrations that orchestrate 5+ tools from one trigger, automate the work-to-cash cycle, and replace SaaS subscriptions with systems your firm owns.

What we build that native integrations can’t

Karbon’s native integrations focus on the basics. Xero and QuickBooks sync client contact data so you don’t maintain two databases. Email integrations connect Gmail and Outlook correspondence to work items. These cover the fundamentals.

Where native integrations fall short is in workflow orchestration. When a tax return is marked complete in Karbon, multiple things need to happen: an invoice needs creating in Xero with the correct service codes, the client needs notifying with a summary and payment link, the CRM record needs updating with the engagement status, and the team needs a notification in Slack that the work is done and billed. That’s one workflow completion, four systems, zero manual steps. No native integration or simple Zapier trigger handles this reliably. We build it.

A growing practice onboarding 10 new clients per month needs CRM deal closure to trigger Karbon work templates with assigned teams and deadlines, Xero or QuickBooks entity setup, Dext configuration, and a client welcome sequence. That’s not “HubSpot to Karbon.” That’s a client onboarding system.

Multi-tool orchestration

The firms we work with don’t need “Karbon to X.” They need “when work completes in Karbon, everything downstream handles itself.”

Examples of what a single custom integration handles:

• Tax return completed → Xero invoice generated with correct service codes, client notified with payment link, HubSpot record updated, team notified in Slack, work item archived in Karbon
• New client accepted in CRM → Karbon work template created with team and deadlines, Xero entity configured, Dext connected with posting rules, client welcome email sent
• Deadline approaching → assigned team member notified in Slack, backup assigned, client update drafted, Karbon work item flagged
• Monthly advisory work triggered → Fathom data refreshed, management report generated, commentary template populated, client meeting scheduled, advisory pack pushed to portal

Each of these replaces 15-30 minutes of manual work. Across 100+ active work items, the savings compound substantially.

Replace SaaS, don’t just integrate it

Accounting firms running Karbon often accumulate separate tools for CRM, client notification, reporting, and workflow alerts. Some of those tools do one thing you actually use.

We’ve seen firms paying for a standalone CRM, a separate client notification system, and a third-party reporting dashboard — when a single custom system connected to Karbon handles all three. Built for their practice workflows, owned by them, with no per-seat licensing.

We start with the audit: map your current stack, identify what’s redundant, and propose what to build vs what to keep.

How we approach Karbon integrations

1. Audit your stack — we map every tool connected to Karbon, how data flows between them, where the manual steps live, and what’s costing you the most time or money. Two weeks.

2. Design the system — not “which tools to connect” but “what should happen when work completes.” We design around your practice workflows, not around tool limitations. The output is a build spec with clear scope.

3. Build and deploy — direct API integration with Karbon. No middleware, no Zapier, no per-task fees. The system connects to your accounting, CRM, and communication tools with full error handling and monitoring. You own the source code.

No marketplace limits

We don’t need official connectors or pre-built integrations. If a tool has an API, a database, a webhook, or even a CSV export, we can connect it to Karbon. We set the rules. We define the logic. We build exactly what your firm needs.

That includes CRM platforms like HubSpot and Pipedrive, accounting tools like Xero and QuickBooks, Dext, Fathom, TaxCalc, BrightPay, and internal systems your firm has used for years.

Compliance across jurisdictions

Every custom Karbon integration we build accounts for the regulatory environment your firm operates in. For UK firms: HMRC Making Tax Digital compliance, anti-money laundering checks, UK GDPR data handling, and data residency requirements. For US firms: IRS requirements, state tax compliance, and data protection standards. For Australian firms: ATO requirements, TPB registration standards, and data sovereignty. For Canadian firms: CRA compliance and provincial regulatory requirements.

This is not a bolt-on. Compliance is part of the system architecture from day one. Workflow triggers that involve client data, financial information, or regulatory filings all have audit trails, access controls, and validation baked in.

See our accounting solutions for more on what we build for accounting firms, or read about how we approach client onboarding and client reporting systems that connect to practice management platforms.