Karbon Pricing: Team vs Business Plans and Where the AI Sits

Karbon costs $59 per user a month on Team and $89 on Business billed annually, or $79 and $99 billed monthly (monthly is for teams of four or more). Its AI is not tied to a plan: Karbon says Karbon AI is currently included for every customer at no extra cost, while Kai and the agents remain in early access.

That second point changes how you choose. Business buys higher limits and more automation, not AI, so paying $30 more a seat to get AI features would waste money today. The seat price is also not the whole bill: the pricing page lists paid add-ons without prices, plus card-processing fees and eSignature credit bundles. Everything below comes from Karbon's own pricing page and AI page as of November 2026, in USD.

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Team and Business seat maths for 3, 6 and 10 users

Karbon charges per user, and every team member who needs access has to be invited as a user, so the bill is the seat price times headcount, part-timers and partners included. These are illustrative sums at list price, showing a month first and then a year in brackets.

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Three details in those numbers are easy to miss. First, a three-person firm cannot pay monthly at all, because Karbon restricts monthly billing to teams of four or more, so it is committing to a year whichever plan it picks. Second, the annual discount is lopsided. Team is 25% cheaper when paid annually ($59 against $79), while Business is only about 10% cheaper ($89 against $99). A six-person firm saves $1,440 a year by committing on Team and $720 by committing on Business.

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Third, Business billed annually ($89) sits only $10 above Team billed monthly ($79). A six-person firm that wants Team's monthly flexibility pays $474 a month, while the same six people on Business with an annual commitment pay $534. That $60 a month is the real price of Business features for a firm that would not otherwise commit for a year. A four-person firm shows the stakes on Team: $316 a month billed monthly against $236 billed annually, an $80 monthly gap that adds up to $960 a year.

A quick break-even shows when annual billing wins. On Team, a year costs $708 a seat ($59 times 12) against $79 a month, so annual is cheaper for anyone who will stay nine months or more. On Business a year costs $1,068 a seat against $99 a month, so the break-even is nearly eleven months. If you expect to use Karbon for the full year, pay annually; if you are unsure it will survive a busy season, the monthly premium is the price of the option to leave.

Enterprise has no public price ("custom pricing"). Karbon's plan card adds a dedicated Karbon contact, customisation and unlimited usage limits, so it is a conversation for firms that outgrow Business limits, not a starting point for a ten-person practice.

What the extra $30 a seat buys on Business

Karbon's comparison table shows the Business upgrade is mostly higher caps plus automation. The rows below are the ones that differ between Team and Business; everything else in the table is on both.

Notice what is missing: no AI row. Karbon's AI page says "all features are available across Karbon's paid plans", so Business is not an AI upgrade. It is a limits-and-automation upgrade, and you can test it with two questions about your own firm.

Do you hit a cap? Say a six-person practice has 1,400 contacts once individuals, businesses and related people are counted. Team's 1,000-contact cap fails on import day, so Business at $534 a month against $354 is not optional. The $180 difference is the cost of the cap, and the reminders come with it.

One cap rarely binds alone, so count every row before you decide. Here is a filled-in count for that six-person firm, with invented figures to show the method; replace them with numbers from your current system.

Two rows fail, so the upgrade is justified twice over. A firm that fails none of them and has no use for automatic reminders can stay on Team with a clear conscience, and check again when it adds a service line, because templates and work types grow with every new service you sell.

Will the automation pay for itself? Say a three-person bookkeeping firm has 300 contacts and simple workflows, so no cap bites. Business costs $90 a month more for three seats. At an internal cost of $30 an hour (an assumption; use your own figure), automatic client reminders and tasklist automators must save three hours a month to break even. If one person spends an hour a week chasing missing documents by hand, the sum favours Business; if clients already respond on time, Team is enough.

The comparison with other platforms matters before you settle. The TaxDome and Karbon comparison covers how the two differ on AI, cost and fit for a small firm, and the tutorial on using the AI already in your practice software explains why you should test the built-in features before you pay for anything extra.

Where Karbon AI sits today, feature by feature

Karbon groups its AI under one banner, but the features are at different stages. Here is what its AI, Kai and AI Agents pages say at the time of writing.

Two sentences on the AI page carry most of the weight. One says Karbon AI is "currently available to all Karbon customers at no additional cost". The other promises that if pricing for AI features is introduced, Karbon will communicate changes in advance. That is a promise to tell you, not a promise to keep it free, so build the possibility into your budget. A simple sensitivity sum helps. Suppose, purely as a test figure that is not Karbon's, AI were priced at $10 per seat a month. Six seats would cost $720 a year, and at $30 an hour the firm needs 24 saved hours a year, or four per person, to break even. If the free features cannot clear that bar in a trial, you know what to do before any charge arrives. The Kai page adds that agent actions go through an approval system where you can approve, edit or reject outputs, and Karbon says nothing executes without your sign-off.

Security and control are worth a line because they affect how you describe the tool to clients. Karbon says its AI runs on the Azure OpenAI Service, that your firm's data stays within Karbon and is not used to train models, and that AI is on by default for all users in a firm. Account administrators can switch it off in firm settings. If your engagement letters tell clients that no AI touches their records, switch it off at firm level until you have changed the wording, rather than relying on each user to avoid the buttons.

Kai deserves a small test before it drives any decision. If you are offered early access, pick three jobs and time them. Karbon's own examples are asking Kai which work is overdue this week, which jobs are over budget, and what needs your attention today. Run each question by hand first, note the minutes and any wrong answers, then ask Kai. Two weeks of results will tell you more than the marketing page can. For a firm that wants AI-written meeting notes, the accountants' note-taker comparison covers options you can use now while the Karbon notetaker is still marked coming soon.

Costs outside the seat price: paid add-ons, fees and credits

The note on this title says to verify add-on fees, and the honest finding is that Karbon publishes most of them only as the words "Paid add-on". The comparison table marks these items that way, with no figure attached:

Because no price is shown, none of them can be in your budget until Karbon quotes them. Treat each as a line item to ask about, and decide which you need. A six-person firm rarely needs a dedicated success manager, but it may well want training in the first quarter.

Two other costs are published. Card and bank payments through Karbon carry processing fees on every plan: 2.6% plus $0.30 on standard cards, 3.6% plus $0.30 on premium cards, 3.9% plus $0.30 on Amex cards, and 1% plus $0.30 for ACH direct debit with a stated maximum of $5.00. Here is what that means on a $2,000 invoice if the firm absorbs the fee:

Move 20 invoices a month from standard card to ACH and the firm saves about $946 (20 times $47.30), several times the $180 monthly Business premium for six seats. Karbon lists fee surcharges as a feature, but check what you are allowed to pass on to clients before you rely on it.

The second published cost is eSignature credits, sold in bundles: 100 credits for $100, 500 for $450, 1,000 for $800, 2,000 for $1,300 and 4,000 for $2,000, with a quote above that. A standard request uses one credit and a request with knowledge-based authentication uses two. Proposals and engagement letters sent through Karbon Engagements use no credits. Say a firm sends 300 requests a year and 100 of them need authentication: that is 400 credits. One 500-credit bundle costs $450, while four 100-credit bundles would cost $400 if bundles can be stacked, so ask whether they can and whether unused credits expire.

Three yearly bills for a 3, 6 and 10-person firm

Putting the published pieces together gives a floor for each firm. These are illustrative, and each adds the smallest eSignature bundle that would cover a plausible year.

The floor excludes everything Karbon does not price in public: training, email insights, custom reporting, a success manager, implementation services and processing fees. Add those as you receive quotes, and keep the floor figure beside the final one so you can see how far the real bill moves from the headline.

Questions for a Karbon demo, in writing

A demo call gives you reassurance, and an email gives you terms you can hold Karbon to. Send these before you agree to anything, and keep the replies with the contract.

Subject: Pricing confirmation before we decide

Hello [first name],

We are a [six]-person practice comparing the Team and Business plans. Please confirm in writing:

1. The total annual price for [six] users on Business, billed annually, and the renewal price for year two.
2. How we add or remove a user mid-term, and what we pay when we do.
3. Whether any of our AI use needs a higher plan or a separate charge today, and whether Kai and the AI agents will cost extra after early access ends.
4. The price of each add-on we might want: training, email insights, custom reporting, a customer success manager.
5. What implementation help is included, and what each guided package costs.
6. Whether eSignature credit bundles stack and whether unused credits expire.
7. How we export all our data if we leave, and in what format.

Thank you,
[your name], [firm]

Question 3 is the one most firms skip. The AI page gives a promise of advance notice, which is helpful, but a written answer from a named person is stronger. Question 2 matters for seasonal teams: if you add two temporary staff for tax season, you want to know now whether you can drop them afterwards or are committed to them for the year.

Five ways a Karbon bill grows past the quote

Buying Business to get the AI. A five-person firm hears about Kai and upgrades from Team to Business at $30 more a seat, which is $150 a month or $1,800 a year. Karbon's AI page says its AI features are available across paid plans and Kai is in early access either way, so the upgrade bought nothing the firm asked for. Decide on caps and automation, then check the AI separately.

Paying monthly when the team is stable. A four-person firm on Team pays $316 a month billed monthly against $236 billed annually, so a year of flexibility costs $960. Keep monthly billing for a firm that expects its headcount to change within the year, not for one that simply has not got round to switching.

Counting only the partners as users. Karbon charges for every team member invited as a user. A firm that budgets for its three partners and then invites an administrator, a bookkeeper and a part-timer has doubled its seat cost. List every person who needs to see a client, a task or an email, and count each one.

Meeting the contact cap on import day. The 1,000-contact limit on Team is easy to ignore until you load a client list that includes spouses, directors and companies as separate contacts. Count contacts before you choose the plan, not after, because an upgrade in week one means paying Business rates for a plan you thought you had avoided.

Assuming early access means free for ever. Kai and the AI agents have no published price, and the AI page says only that Karbon will give notice if pricing for AI features is introduced. Use them, measure what they save, and keep a figure in mind for what you would pay. For a wider view of where software seats sit in a small firm's AI spend, see the tutorial on Copilot seat costs for a small accounting firm, and for a competing pricing model see Dext's plans for practices.

Karbon pricing questions owners ask

Does Karbon charge extra for Kai or its AI features?

Not today, according to Karbon. Its AI page says Karbon AI is currently available to all customers at no additional cost, across paid plans, and that customers will be told in advance if pricing is introduced. Kai and the AI agents are labelled early access with no published price, so ask your Karbon contact how they will be charged after general release.

Can a three-person firm pay for Karbon monthly?

Karbon's pricing page says monthly subscriptions are only available for teams of four or more. A three-person firm therefore pays annually, at $59 per user a month on Team or $89 on Business. That comes to $2,124 or $3,204 a year for three seats, before any add-ons or processing fees.

How much cheaper is annual billing on Karbon?

Team costs $59 per user a month billed annually against $79 billed monthly, so annual is about 25% cheaper. Business costs $89 against $99, about 10% cheaper. For six users that saves $1,440 a year on Team and $720 on Business, which is why the choice of billing matters more on Team.

What does Karbon cost beyond the per-user price?

The pricing page lists paid add-ons (email insights, custom reporting, training and a dedicated customer success manager) without prices, card-processing fees from 2.6% plus $0.30, and eSignature credit bundles from $100 for 100 credits. Karbon also offers implementation services. Ask for a written quote that covers every item you plan to use.

Further reads

• Accounting Software for CPA Firms: Automation Features Compared — Automation features compared across practice platforms, not only Karbon.
• How Much Does AI Cost a Small Accounting Firm? — Where software seats sit in a small firm's total AI spend.
• Best AI Tools for Small Accounting Firms, Sorted by Task (2026) — AI tools by task, for firms deciding what to add around the platform.
• TaxDome Automations: What to Automate First in a Small Practice — What a competing platform automates first, for comparison.
• Free AI Tools for Accounting: Which Jobs Free Plans Handle — Free plans that cover some jobs before you pay for more.
• Hire an AI Consultant for an Accounting Firm: Scope, Cost, Red Flags — When outside help is worth paying for.
• TaxDome Pricing: Plans, Seasonal Seats and What to Ask on the Demo — TaxDome's new client-based price against the old seats: four practices modelled, active-account rules, the AI add-on and the questions to ask on the demo.
• AI Tools and AI Development: The Complete 2026 Guide — the AI hub, including every tutorial in the AI-for-business series.

Sources: Karbon pricing page, Karbon AI page, Kai page, AI Agents page and release notes (all read 1 November 2026 and rechecked 4 November 2026).