TaxCalc is trusted by over 11,000 accountancy firms in the UK, and for good reason. Its tax compliance software — self assessment, corporation tax, accounts production — is solid. Reliable. The kind of tool you don't think about because it just works.
But practice management? That's a different story.
TaxCalc's practice management: bolted on, not built in
TaxCalc started life as tax software. The practice management features came later, and it shows. Their Practice Manager module handles the basics: client records, job tracking, task assignments, deadlines. It does what it says on the tin.
The problem is what it doesn't do. Users on AccountingWeb consistently describe the practice manager as making "some tasks much harder than they should be." It lacks an audit trail — which, for a tool managing client work, feels like an oversight rather than a design choice. And integration with other practice tools is limited, meaning you'll often end up entering client details in two places.
TaxCalc launched Engager.app more recently as a cloud-based practice management bolt-on. It handles client onboarding, letters of engagement, and value-based pricing. It's a step in the right direction, but it's still a separate product sitting alongside the core software rather than something built into it.
Where TaxCalc shines
Let's be fair about what TaxCalc does well, because there's plenty.
Tax compliance is where they've earned their reputation. Self assessment, CT600, partnership returns, trust returns — the actual filing side of the software is mature, well-maintained, and keeps pace with HMRC changes. Their UK-based support team gets consistently good reviews, which is worth more than most firms realise until the first time they need urgent help during January.
If your firm's primary concern is tax filing and you need basic job tracking on top, TaxCalc covers that. The price is reasonable and they've been around long enough that you know the product isn't disappearing tomorrow.
What Fortium does differently
Fortium isn't tax compliance software — we're not trying to replace TaxCalc's filing tools. We're the layer that sits around everything else your firm does.
Practice management from the ground up. This isn't a module bolted onto something else. Client management, document storage, workflows, invoicing, compliance tracking, communications — it's all one system, built to work together. When a client uploads a document through the portal, it appears in their file, triggers the relevant workflow step, and your team can see it immediately. No re-keying. No switching between apps.
A client portal your clients will use. TaxCalc's Document Manager lets you share files with clients, but it's not a true portal experience. Fortium gives each client their own login where they can upload documents, view their engagement status, download what you've shared, and see what's outstanding. It's the difference between emailing someone a link and giving them their own space.
Real-time visibility. TaxCalc's practice manager tracks assignments and deadlines, but it doesn't show you what's happening right now. Who's working on what. Which clients have responded. Where the bottlenecks are. Fortium's dashboard gives you that at a glance — and if you've got a team bigger than three or four, that visibility starts to matter a lot.
WhatsApp and email integration. Your clients don't just communicate via one channel. (We wrote about how scattered communication costs firms time in our client portal article.) Some email. Some WhatsApp. Some do both depending on the day. Fortium pulls all of that into one place against the client record, so you're not hunting through three different apps to find the message where Mrs. Patel confirmed her dividend amounts.
No per-seat pricing. TaxCalc's practice tools are priced per user with various add-on charges. Fortium is flat-rate. Your whole team, one price.
Can you use both?
Yes — and for a lot of firms, that might be the right answer. Keep TaxCalc for tax filing (it's good at it) and use Fortium for everything else: client management, document collection, workflows, communication, invoicing.
The question is whether you want to keep paying for TaxCalc's practice management add-ons when there's a purpose-built tool that does that job better. Most firms we've spoken to find they're paying for features in one tool that they never use because they've got a better version somewhere else. Trimming that overlap saves money and reduces the number of systems your team needs to learn.
The bottom line
TaxCalc is excellent tax software. Its practice management is adequate. If you're happy with "adequate" and you're primarily a tax-focused firm, it'll do.
But if you're finding that the practice management side is where you lose time — chasing documents, tracking jobs across multiple tools, dealing with client communication scattered across email and WhatsApp — that's exactly the gap Fortium fills. One system for the non-compliance side of running your firm, built properly rather than added on.
See how Fortium works — join the waitlist.