Karbon vs TaxDome (2026): Which Is Better for Your Firm?

Karbon is best suited to firms whose work runs through email: every plan includes email triage and team collaboration tools. TaxDome is best suited to tax-focused firms that want one client portal and app for intake, documents, signatures and payments. Karbon starts at $59 per user a month billed annually. TaxDome has one plan priced by active clients rather than users, from $1,500 a year for up to 150 clients, paid upfront with no refunds.

We checked every price and feature below on each company’s own website on 24 September 2026, and TaxDome’s pricing again on 3 November 2026. The sources are at the end. We make Tidyflow, which is covered separately after the comparison.

Karbon vs TaxDome at a glance

Karbon vs TaxDome: pricing (2026)

Karbon, per user per month (checked September 2026):

• Team: $59 billed annually, or $79 billed monthly
• Business: $89 billed annually, or $99 billed monthly
• Enterprise: custom pricing
• Monthly billing is only available to teams of 4 or more, and multi-year terms are also offered

TaxDome, one plan priced by active clients, billed annually and paid upfront (checked November 2026):

• The minimum is 150 active clients for $1,500 a year, and it applies even with fewer than 150 clients
• Each client beyond 150 is priced in volume bands, from $15 down to $5. TaxDome’s examples: 400 active clients cost $4,125 a year, 1,000 cost $9,000 and 3,000 cost $16,500
• An active client is any client with activity in the past 12 months, such as logging in, uploading, messaging or receiving an invoice. Each client account counts separately
• 20 seats are included, with no per-seat fees. More than 20 seats or 3,000 clients needs custom pricing
• There is no monthly billing and no multi-year plan
• Add-ons: AI $200 a month, Managed Client Care $100 a month, premium support $249 a month, and a white-labeled mobile app on quote
• Existing customers keep their current plan until their first renewal on or after 1 January. If you plan to move before then, the TaxDome migration checklist lists every export to take with you

Karbon vs TaxDome: what a 5-person firm pays

List prices for year one, before e-signature credits, add-ons and onboarding. Karbon charges per user. TaxDome charges by active clients, so its price for a 5-person firm depends on how many clients the firm serves, and stays the same for any team of up to 20.

Karbon vs TaxDome: costs and terms to check

Karbon

• E-signatures are bought as credits: 100 for $100, 500 for $450, 1,000 for $800, 2,000 for $1,300 and 4,000 for $2,000. A request with identity checks uses two credits.
• Automatic client reminders, Tasklist Automators, client groups, user permissions and the API need the Business plan.
• Custom Reporting is a paid add-on on Business and Enterprise, and Email Insights is a paid add-on below Enterprise.
• Karbon offers group onboarding and guided implementation packages but doesn’t publish their prices.

TaxDome

• The plan is paid a year upfront, and TaxDome’s refund policy says it doesn’t give refunds or credits.
• The price follows your active client count, not your team size. A client counts if they logged in, uploaded, messaged or received an invoice in the past 12 months, and each client account counts separately.
• 20 seats are included. More than 20 seats, or more than 3,000 clients, needs a custom quote.
• AI is a $200-a-month add-on. A white-labeled mobile app is priced on quote. Self-serve onboarding is free, and paid onboarding starts at $999.

Karbon vs TaxDome: email integration and workflow

Karbon is the stronger of the two on email. Every plan includes email triage and team collaboration: emails are linked to clients and work, can be assigned to teammates, and can be discussed with comments and @mentions. Capacity planning is included on every plan. Work templates and Tasklist Automators handle complex, multi-step processes, with automators on the Business plan. The Team plan is capped at 40 work templates, 1,000 contacts and 3 teams.

TaxDome centers communication on the client portal. Its plan includes integrated email, secure chat and SMS, plus ready-made automations for tax, bookkeeping and accounting workflows. Roles and permissions and a 30-day activity feed are also included.

Karbon vs TaxDome: client portal and app

Both give clients a portal and a mobile app where they can upload documents, sign and pay.

• Adoption: TaxDome’s client app is rated 4.9 from 40,922 ratings on the US App Store. Karbon’s client app is newer, with 3 ratings so far.
• E-signatures: unlimited on TaxDome; bought as credits on Karbon.
• Client support: TaxDome’s Managed Client Care add-on, at $100 a month, has TaxDome’s support team answer your clients’ questions about using the platform.
• Branding: Karbon for Clients uses your logo and colors. TaxDome offers a custom firm URL and branded emails, and a white-labeled mobile app is priced on quote.

Karbon vs TaxDome: AI features in 2026

• Karbon: Karbon AI summarizes email threads and drafts replies. Kai, Karbon’s AI coworker, is in limited early access with a waitlist, and its AI notetaker is listed as coming soon.
• TaxDome: AI is a $200-a-month add-on covering document organization, AI tax return delivery, and MCP and API access. TaxDome has also announced its Atlas agent.

When to choose Karbon

• Your team’s work runs through email and you want it shared, assigned and discussed in one place
• You have 4 or more people and want the option to pay monthly
• You want deep workflow templates and automation, and you’ll use the Business plan
• You don’t need IRS transcripts

When to choose TaxDome

• You’re a tax-focused firm and want clients working in one portal and app
• You want unlimited e-signatures and proposals included in the plan
• You want IRS transcript downloads, which are included
• Your team is large relative to your client count, since TaxDome charges by active clients rather than seats
• You’re comfortable paying a year upfront

Questions to ask on your demo

Both sell through a demo. Worth asking:

• Karbon: What will our e-signature volume cost in credits? Which of the features we need require Business? What does guided implementation cost?
• TaxDome: How many of our clients will count as active? What happens if we need to leave early? Which add-ons would we need, and what does the white-labeled app cost?

Or Consider Tidyflow

If neither Karbon nor TaxDome is quite right (Karbon is email-first and TaxDome is annual-upfront), Tidyflow is the third option for growing firms.

Tidyflow is $39/user/month ($29/user/month billed annually), billed monthly or annually with no user minimum and no implementation fee. It includes job management, a client portal, invoicing with Stripe payments, proposals and engagement letters, unlimited standalone e-signatures, a shared inbox for Gmail, Microsoft 365 or IMAP, time tracking, and client requests with automated reminders. Ready-made tax organizers cover Forms 1040, 1120-S, 1065, 1120 and 1041. Pro adds conditional questions and document approvals; with connected online payments, an invoice-linked approval can block opening, downloading, approving or signing while payment is required. Compare the Pro plan when you need that handoff. Tidyflow Agent is included on every plan: an AI teammate you can assign a Job to or @mention in a comment, plus connectors so Claude, ChatGPT and other MCP tools can work inside your workspace. Tidyflow has no IRS transcript tools. Its iOS and Android apps serve both your team and your clients, and client chat is due in November 2026. If you’re leaving TaxDome, see which TaxDome features Tidyflow has, which are coming and which are missing, and TaxDome’s new pricing explained for what your renewal will cost.

Best for: Growing accounting firms that want to run client work in one place, with monthly billing and setup in about a day, without the overhead of either Karbon or TaxDome. See the full Tidyflow vs Karbon and Tidyflow vs TaxDome comparisons, TaxDome vs Canopy and Karbon vs Canopy, or the wider practice management software for accounting firms guide.

Try Tidyflow free. No credit card required.

Frequently asked questions

Is Karbon or TaxDome cheaper?

It depends on your client count. For a 5-person firm on annual billing, Karbon Team costs $3,540 a year. TaxDome charges by active clients, not users: $1,500 a year for up to 150 active clients and $4,125 for 400, paid upfront, with up to 20 seats included. Karbon also sells e-signatures as credits, while TaxDome includes unlimited e-signatures. Karbon prices were checked in September 2026 and TaxDome prices in November 2026.

Does TaxDome offer monthly billing?

No. TaxDome is billed annually and paid upfront, with no monthly billing or multi-year plans, and its refund policy says it does not give refunds. The price is set by active clients, not seats, and includes 20 seats.

Does Karbon include e-signatures?

Karbon includes e-signature sending, but you buy credits: 100 requests cost $100, down to 4,000 for $2,000. A request with identity checks uses two credits. Proposals and engagement letters sent through Karbon Engagements use none.

Which is better for a small firm, Karbon or TaxDome?

TaxDome’s minimum is $1,500 a year for up to 150 active clients, whether the firm has one person or 20. Karbon charges per user, and its monthly billing needs at least four users. Email-heavy teams tend to suit Karbon, and portal-first tax firms tend to suit TaxDome.

Do Karbon and TaxDome have AI features?

Yes. As of September 2026, Karbon AI summarizes email threads and drafts replies, and its Kai coworker is in limited early access. TaxDome sells AI as a $200-a-month add-on covering document organization, AI tax return delivery, and MCP and API access.

Can Karbon or TaxDome pull IRS transcripts?

TaxDome’s plan includes an IRS integration that downloads transcripts to client accounts. Karbon has no IRS tools of its own; its TaxNow integration, a separate subscription, adds transcript checks and IRS notice alerts.

Do Karbon and TaxDome have mobile apps?

Yes. Karbon has iOS and Android apps on every plan, plus a client app. TaxDome has a firm app and a client app, and its client app is rated 4.9 from more than 40,000 ratings on the US App Store.

Sources

Checked on 24 September 2026, except TaxDome pricing, checked on 3 November 2026:

• Karbon: pricing and plan comparison, implementation services, Kai, AI, client portal, security
• TaxDome: pricing, refund policy, TaxDome AI, onboarding
• App Store ratings: TaxDome client app, Karbon for Clients