Anyone weighing TaxDome vs Karbon is usually comparing two things that are not the same shape. Both price per user and both call themselves practice management, but one sells a closed all-in-one suite billed a year at a time, and the other sells a collaboration core with pieces you buy separately. Search Karbon vs TaxDome and you will find plenty of feature grids. Very few of them add up what you would actually pay.
Full disclosure before the first table: this page is published by Kveldo, which competes with both. A comparison written by a competitor is still useful if every number is sourced and dated, so each figure below was pulled from the companies' own pricing pages on October 14, 2026, in US dollars. There is a short section on us near the end that you are welcome to skip.
Key points
- TaxDome bills per seat, per year, upfront: $800 Essentials, $1,000 Pro, $1,200 Business on a one-year commitment. Essentials is for solo users only.
- Karbon bills per user, per month: $59 Team and $89 Business on annual billing, $79 and $99 if you pay monthly. Monthly billing is only offered to teams of four or more.
- At one seat Karbon is the cheapest of the three at $708 a year. The gap reverses fast: by five seats TaxDome Pro is $5,000 a year and Karbon Team is $3,540.
- E-signature is where the two differ most. TaxDome includes unlimited e-signatures and knowledge-based authentication in the plan. Karbon sells e-signature as credit bundles starting at $100 for 100 credits, and a KBA request spends two credits instead of one.
- Karbon's entry tier is capped in ways the price does not advertise: 1,000 contacts, 35 workflow statuses, 40 work templates, three teams, and no API, no user permissions and no automatic client reminders.
TaxDome vs Karbon at a glance
| TaxDome | Karbon | |
|---|---|---|
| Pricing basis | Per seat, per year, billed upfront | Per user, per month |
| Published price | $800 / $1,000 / $1,200 per seat per year (1-year term) | $59 / $89 per user per month (annual); $79 / $99 (monthly) |
| Longer commitment | $700 / $900 / $1,100 per seat on a 3-year term | Multi-year available, priced by agreement |
| Monthly billing | Not offered; plans billed upfront | Teams of 4+ only |
| Solo option | Essentials, $800/yr, single user | None; Team is the entry tier |
| E-signature | Unlimited, included | Credit bundles, from $100 per 100 credits |
| KBA for remote 8879 | Included | Two credits per request |
| Client portal | Included | Included on every plan |
What the bill looks like at 1, 5 and 15 seats
Per-seat pricing is easy to compare at one seat and hard to compare at fifteen. Here is the arithmetic, using each company's cheapest annual option at that headcount.
| Seats | TaxDome (1-year) | Karbon Team (annual) | Karbon Business (annual) |
|---|---|---|---|
| 1 | $800 | $708 | $1,068 |
| 5 | $5,000 (Pro) | $3,540 | $5,340 |
| 15 | $15,000 (Pro) | $10,620 | $16,020 |
Two things fall out of that table.
The first is that Karbon is genuinely cheaper than TaxDome for a very small firm, and we are not going to pretend otherwise. At one seat Karbon Team costs $708 a year against TaxDome Essentials at $800.
The second is that a solo practitioner cannot pay Karbon monthly. Monthly billing starts at four users. A one-person firm pays for the year or does not start, which is the same cash-flow problem TaxDome's upfront billing creates, arriving by a different road.
The e-signature line nobody quotes
This is the single biggest difference between the two, and it does not appear in either company's headline price.
TaxDome states it plainly: unlimited document storage and e-signatures at no extra cost, with knowledge-based authentication available so a remotely signed Form 8879 stays IRS-compliant.
Karbon sells e-signature separately, in credit bundles:
| Credits | 100 | 500 | 1,000 | 2,000 | 4,000 |
|---|---|---|---|---|---|
| Price | $100 | $450 | $800 | $1,300 | $2,000 |
In Karbon's own words, each e-signature request uses one credit, and each request with knowledge-based authentication uses two. Engagement letters sent through Karbon Engagements do not consume credits.
Work out what that means in a tax season. A firm sending 400 returns out for signature with KBA spends 800 credits, which is the $800 bundle, on top of the per-user subscription. For a five-person firm on Karbon Team that turns $3,540 into $4,340, because 800 credits means buying the 1,000-credit bundle. It is not a hidden fee, it is published on the same page as the plans, but it is below the fold and it scales with your busiest month.
What Karbon's entry tier leaves out
Karbon Team at $59 looks like the obvious starting point. Its comparison table lists limits the plan summary does not.
| On Karbon Team | Limit |
|---|---|
| Contacts | 1,000 |
| Workflow statuses | 35 |
| Work templates | 40 |
| Work types | 30 |
| Teams and sub-teams | 3 |
| Placeholder job roles | 15 |
Four things are absent from Team rather than merely capped: automatic client reminders, tasklist automators, user permissions, and the Karbon API. Client groups are absent too. Email Insights and custom reporting are paid add-ons on both Team and Business, not included features.
None of that makes Team a bad plan. It makes the $59 and the $89 tiers less interchangeable than they look, and it means the honest Karbon comparison is usually Business at $89, not Team at $59.
Karbon vs TaxDome: which fits which firm
Buy Karbon if the thing breaking your week is internal coordination. Karbon's center of gravity is email triage and shared work: assigning and commenting on email across the team, work timelines, capacity planning. Firms that live in a shared inbox and keep losing track of who replied tend to feel that immediately. Take Business rather than Team unless you are certain the caps fit.
Buy TaxDome if you want one closed system and can prepay. The plan covers the client portal, document storage, e-signature with KBA, proposals and payments without a separate line item, and Pro adds an IRS integration that pulls transcripts into client accounts. Worth being precise about that last one: it retrieves transcripts, it does not e-file. Neither of these platforms files a return.
Buy neither if the per-seat model is the actual problem. Which brings us to the disclosure.
Where Kveldo fits, since we published this
Kveldo prices per firm instead of per user: $79 a month Solo, $199 for up to five staff seats, $399 for up to fifteen, $699 for up to twenty-five, month to month with no lock-in and a 14-day trial that does not ask for a card. Client portal users are unlimited and free on every tier. Kveldo Sign includes unlimited envelopes with no per-envelope fee. Two-factor authentication is mandatory on every account rather than an upgrade.
Against the same headcounts above, annual: $790 at one seat, $1,990 at five, $3,990 at fifteen.
Now the honest part. At one seat Karbon Team is cheaper than Kveldo Solo, $708 against $790, and if you are a solo practitioner whose only concern is the smallest possible invoice, that is a real answer. Kveldo does not e-file, and it does not offer on-screen 8879 signing with knowledge-based authentication the way TaxDome does. It handles 8879s through a portal document request instead: the client signs the form by hand and uploads it, which IRS Publication 1345 explicitly permits and does not treat as a remote transaction. That is a procedural difference, not a capability gap. And Karbon's email triage is a genuinely different product philosophy; a collaboration-heavy firm should weigh it on the merits rather than on our say-so.
What the flat model changes is what happens when you grow. Hiring a sixth person on a per-seat platform adds a seat charge every month forever. On Kveldo it moves you between bands, and between bands it costs nothing at all.
Frequently asked questions
TaxDome vs Karbon: which is cheaper?
At one seat, Karbon. Karbon Team is $708 a year against TaxDome Essentials at $800. At five seats Karbon Team is $3,540 against TaxDome Pro at $5,000, and at fifteen it is $10,620 against $15,000. The comparison narrows if you need Karbon Business at $89 per user, which is $16,020 at fifteen seats and more than TaxDome Pro.
Karbon vs TaxDome: which is better for a solo practitioner?
Karbon on price, TaxDome on billing flexibility and scope. Karbon has no solo tier and does not offer monthly billing below four users, so a one-person firm pays annually. TaxDome Essentials is built for a single user at $800 a year, billed upfront, and includes e-signature with KBA.
Does Karbon charge extra for e-signatures?
Yes. Karbon sells e-signature as credit bundles, starting at $100 for 100 credits and running to $2,000 for 4,000. Each request uses one credit and each request with knowledge-based authentication uses two. Engagement letters sent through Karbon Engagements do not use credits.
Can you pay Karbon monthly?
Only with four or more users. Karbon's pricing page states that monthly subscription is available to teams of 4+, on both the Team and Business plans. Smaller firms pay annually.
Does TaxDome or Karbon file tax returns?
Neither. TaxDome's Pro plan includes an IRS integration that downloads transcripts into client accounts, which is retrieval rather than filing. Returns are transmitted in your tax software in both cases.
What is the catch with Karbon's $59 plan?
Caps and omissions rather than a catch. Karbon Team allows 1,000 contacts, 35 workflow statuses, 40 work templates and three teams, and leaves out user permissions, the Karbon API, automatic client reminders, tasklist automators and client groups. Email Insights and custom reporting are paid add-ons on Team and Business alike.
Sources
Karbon plan prices, monthly-billing restriction, e-signature credit table and tier caps: karbonhq.com/pricing, fetched October 14, 2026 with the currency selector set to USD. TaxDome plan prices, upfront billing note, e-signature, KBA and IRS transcript integration: taxdome.com/pricing, fetched October 14, 2026. Kveldo prices, seat bands, trial terms and Kveldo Sign: kveldo.com/pricing, fetched October 14, 2026.