The State of UK Accountancy Software in 2026

The UK accountancy software market has been through more acquisitions, rebrandings, and "cloud transformations" in the last three years than most people can keep track of. If you haven't looked up from your desk recently, the landscape has shifted underneath you.

So here's an honest map of where things stand in 2026. Who's doing what, who's been swallowed up, and what "cloud" actually means when a vendor says it.

The PE acquisition wave

Private equity has reshaped this market. IRIS, backed by Hg Capital and then ICG, has been on a buying spree that's lasted the better part of a decade. Senta, Staffology, KashFlow, Star Practice Management — all absorbed into the IRIS portfolio. The strategy is straightforward: buy established products with loyal customer bases, cross-sell across the group, and consolidate.

It's a perfectly rational business model. It's also not one that prioritises innovation. When your primary growth strategy is acquisition rather than product development, the products you buy tend to plateau. Development teams get reorganised. Roadmaps get "aligned." Features that were promised before the acquisition quietly disappear from the changelog.

The big players, honestly assessed

IRIS — the everything suite

IRIS remains the most widely installed accountancy software in the UK. Accounts production, tax, payroll, practice management, HR — they've got a product for everything. The problem is that many of these products were built (or acquired) at different times, with different technology stacks, and they don't always talk to each other as smoothly as the sales pitch suggests.

The interface feels dated. Support quality has declined since the move to offshore call centres — the Trustpilot reviews tell that story clearly enough. And per-seat licensing adds up fast once you need multiple modules. For smaller firms, the lock-in isn't worth it.

Senta — uncertain future

Senta was the scrappy, modern practice management tool that a lot of small firms loved. Clean interface, good workflow automation, fair pricing. Then IRIS bought it in 2022.

Since the acquisition, development has slowed. The community forums are quieter. Nobody's been told that Senta is being discontinued, but nobody's been given a compelling roadmap either. If you're on Senta, you're not in a bad position today — but betting your practice's future on a product whose parent company has a track record of folding acquisitions into larger suites? That's a gamble.

Xero Practice Manager — free but limited

Xero's practice management comes bundled free with Xero HQ, which makes it tempting. For a sole practitioner or a two-person firm, it can be enough.

The limitations become clear as you grow. Document management is basic — most Xero PM users bolt on FYI or SuiteFiles just to handle client documents. There's no built-in client portal, no e-signatures, no AML checks. You end up assembling five or six tools that loosely connect, each with its own login and subscription.

Free practice management that requires three paid add-ons isn't really free. It's distributed cost.

TaxCalc — great at tax, less so at everything else

TaxCalc has built a genuinely good tax product. Accounts production has improved significantly, and for pure compliance work — self assessment, corporation tax, CT600s — they're competitive with anyone.

The practice management side is thinner. Client management exists but lacks depth. Document storage is basic. If you just need a solid tax engine with some client tracking bolted on, TaxCalc is a decent choice. If you want proper workflow management, a client portal, and integrated communications — you'll be looking elsewhere.

CCH (Wolters Kluwer) — enterprise overkill

CCH is powerful. Nobody disputes that. It's also built for large firms with dedicated IT teams and the budget to match.

For a firm with 5 to 15 staff? It's wildly over-specified. The implementation is complex, the interface is dense, and the cost structure assumes you're a top-100 firm. Most small practices who've tried CCH describe it as "impressive but exhausting."

Capium — the growing cloud player

Capium deserves a mention as one of the few UK-focused platforms actually built for the cloud from day one. Practice management, document storage, client portal — and their pricing is reasonable. For firms that want a cloud-native alternative without legacy baggage, Capium is worth evaluating.

The trade-off is maturity. Some features feel early-stage. But the direction of travel is encouraging.

What "cloud" actually means (and doesn't)

Half the products in this market describe themselves as "cloud" when what they really mean is "we've put our Windows desktop application on a remote server and you access it through a browser or Citrix session."

That's hosted software. It's not cloud-native. The difference matters.

Cloud-native software is built for the browser from the start. It loads fast. It works on mobile. It doesn't require plugins, Java applets (yes, some vendors still use these), or specific browser versions. Updates happen automatically. Your data is accessible from anywhere without a VPN.

Hosted legacy software gives you remote access to the same old interface. It's still slow. It still looks like it was designed in 2008. The server just lives in someone else's data centre instead of your office cupboard.

When a vendor tells you they're "in the cloud," ask them: was this product built for the browser, or was it moved there? The answer tells you everything about the next five years of your experience.

Where the gaps still are

Despite all the products in this market, a few gaps persist.

Integrated communications. Most practice management tools treat email and messaging as someone else's problem. Your client conversations happen in Outlook, your file notes happen in the PM tool, and never the twain shall meet.

Client portals that clients actually use. Many "client portals" are really just shared folders with a login page. A proper portal — where clients can upload documents, sign engagement letters, and see their own information — is still surprisingly rare as a built-in feature. Most firms bolt one on separately.

MTD workflow support. With MTD for Income Tax now live, practices need tools that handle quarterly touchpoints at scale. Most practice management systems were designed around annual compliance cycles. Quarterly reporting means four times the workflow tracking. Not everyone's caught up.

Where Fortium fits

We're a new entrant, and we're upfront about that. Fortium is purpose-built practice management for UK firms with 3 to 30 staff. Client management, document storage, client portal, workflows, invoicing, email integration, e-signatures, AML/KYC, and HMRC MTD — all built together, not assembled from acquisitions. Flat pricing, no per-seat charges, cloud-native from the first line of code.

We're not trying to replace your tax software. But the practice management layer — the part that organises your clients, your documents, and your team's work — that's where we think the market has been underserved for years.

The bottom line

The UK accountancy software market in 2026 is dominated by consolidated, PE-backed suites selling breadth over depth, and a handful of cloud-native challengers trying to do fewer things better. The middle ground — affordable, modern, genuinely integrated practice management for small firms — has been surprisingly empty.

That's changing. And if your current software was last genuinely innovative before the pandemic, it might be time to look around.