Leaving IRIS feels a bit like leaving a job you've been at for fifteen years. You know it's not working anymore, but the thought of actually doing it — packing everything up, learning something new, dealing with the transition — keeps you stuck for another year. And then another.
On AccountingWEB, there's a thread titled "I need a reliable alternative to IRIS" that has been running, in various forms, since at least 2019. The replies always follow the same pattern: frustration with support, complaints about costs going up, a genuine desire to leave — and then a long pause when someone asks "so what did you actually switch to?"
The gap between wanting to leave and actually leaving is where most firms get stuck. This guide is about closing that gap.
Understand what you're actually leaving
IRIS isn't one product. Most firms use some combination of IRIS Accountancy Suite (or IRIS Elements), IRIS Practice Management, IRIS Time & Fees, IRIS Personal Tax, IRIS Business Tax, IRIS Accounts Production, and possibly newer additions like IRIS OpenSpace for document management.
Before you switch anything, map out which IRIS products you're currently using and what each one does for you. Be specific. Not "accounts production" but "we produce 180 sets of accounts in IRIS AP per year and our team of four knows the workflow." Not "practice management" but "we track 320 clients, 6 workflows, and use time recording for billing."
This matters because you probably won't replace all of IRIS with one tool. Your migration is really several smaller migrations, and some will be easier than others.
The data question
This is the part that stops most firms in their tracks. And honestly? It's not as bad as you think. But it's not nothing either.
What you can typically export
Client lists. IRIS will let you export client data — names, addresses, UTRs, company numbers, contact details — usually as a CSV. This is the easy bit. Every alternative platform can import a CSV client list.
Documents. If you're using IRIS OpenSpace or storing documents within IRIS, you can generally download them. The question is structure. You'll get the files, but you might lose the folder hierarchy and metadata (tags, dates, categories) that IRIS used to organise them. Plan to spend some time reorganising after the move.
Time records and billing history. These are typically exportable, though the format varies. You'll want this for reference and for any ongoing WIP calculations. Export it before you cancel — not after.
Tax return data. If you're moving tax compliance to a different platform (TaxCalc, Taxfiler, etc.), the migration path depends on the destination. Some tools can import directly from IRIS; others need manual re-entry for the first year. Check with the new provider before you commit.
What you'll probably lose
Workflow history. The record of who did what, when, for which client — that granular audit trail typically doesn't survive a platform change. You'll have your current-year data, but the historical trail of task completions, reviewer sign-offs, and workflow steps won't come across.
Email correspondence filed in IRIS. If you've been filing client emails within IRIS, those are likely stored in IRIS's proprietary format. You might be able to export them, but reattaching them to the right clients in a new system is manual work. This is one of the strongest arguments for starting your email filing fresh in the new tool rather than trying to migrate years of correspondence.
Custom reports. Any reports you've built in IRIS Practice Management or Time & Fees won't transfer. Document what they look like and what data they pull so you can recreate them (or find equivalents) in the new platform.
Integration links. If IRIS is connected to your accounts production, tax, or payroll modules, severing those links has knock-on effects. Think through which integrations you actually use versus which are just enabled.
Contract and licensing
Check three things in your IRIS contract before you do anything else.
Notice period. IRIS contracts typically require written notice, and the notice period can be longer than you expect. Some firms have reported needing to give 90 days' notice. If your contract auto-renews annually, you might have already missed the window for this year. Find out now so you can plan the timing.
Early termination fees. If you're mid-contract and want to leave early, there may be penalties. Some IRIS agreements require you to pay out the remainder of the contract term. Get the exact number in writing before you start shopping for alternatives.
Data access after cancellation. This is the one that catches people. On the AccountingWEB thread "IRIS read only access," several users discussed what happens to your data once you stop paying. Some reported losing access entirely. Others were offered read-only access for a limited period. Clarify this upfront and make sure you've exported everything you need before your contract ends. Once access is gone, getting it back is difficult and sometimes impossible.
Planning the actual switch
Don't try to migrate everything at once. The firms that have a good experience switching away from IRIS tend to follow a phased approach.
Phase 1: Practice management first
Start with the layer that's easiest to move and hardest to live without: client management, workflows, document storage, and communications. This is the part of your day that touches every client but doesn't require deep integration with accounts production or tax filing.
Import your client list. Set up your workflows in the new tool. Start filing documents and emails there. Keep IRIS running in parallel for a month or two while you verify everything is working. This is where most of the daily pain lives, so you'll feel the improvement immediately.
Phase 2: Client-facing changes
Once the internal move is done, introduce your clients to any new systems. If your replacement includes a client portal, roll it out to a batch of 20-30 clients first. Get their feedback. Fix any rough edges. Then roll it out to the rest.
Don't underestimate how much clients care about this. For most of them, your software is invisible — they just want to send you documents and get answers. If the new system makes that easier (or harder), they'll notice.
Phase 3: Accounts production and tax
This is the bigger decision, and it's the one you can take your time on. If you're happy with IRIS Accounts Production and IRIS Tax, you can keep using them alongside a different practice management platform. Not everything has to move at once.
If you do want to replace accounts production and tax, look at TaxCalc, Taxfiler, or other cloud-native options. The AccountingWEB thread "IRIS PTP to TaxCalc" has detailed accounts from firms that have made this specific switch, including honest assessments of what went well and what didn't. Worth reading before you commit.
What most firms get wrong
Trying to replicate IRIS exactly. Your new software won't work the same way as IRIS. It shouldn't — the whole point is that something was broken. Resist the urge to rebuild every custom report, every workflow, every folder structure exactly as it was. Take the opportunity to simplify. You've probably been carrying processes that nobody remembers the reason for.
Not allocating enough time. Budget two to three months for the transition, minimum. Not because the technical migration takes that long, but because your team needs time to learn the new system while still doing their jobs. Trying to do it over a weekend is how you end up with errors, frustrated staff, and a quiet return to IRIS by Tuesday.
Forgetting about the busy period. Don't start a migration in December. Don't start one in January either, if your firm is buried in self-assessment. Pick a quiet period — late spring or summer, typically — and give yourself a runway.
Not telling HMRC. If your IRIS setup is linked to your HMRC agent services account, you may need to update your software connections when you switch. This is especially relevant for Making Tax Digital submissions. Check whether your new platform connects to HMRC directly or whether you need to set up new authorisations.
Is it worth the pain?
Moving away from IRIS is disruptive. There's no point pretending otherwise. You'll have a few weeks of parallel running where everything takes longer, a few frustrated team members who preferred the old way, and at least one moment where someone can't find something that was "definitely in IRIS."
But the firms that have made the switch consistently say the same thing: they wish they'd done it sooner. The daily experience of using modern, cloud-native software — fast, accessible anywhere, with proper support from people who know the product — is transformative after years of IRIS. Not because IRIS is terrible, but because the gap between desktop-era software and modern practice management has grown wide enough that it affects how your team works every single day.
If you're thinking about it, start with the contract check and the data export. Those two steps cost you nothing and give you the information you need to make a real decision instead of just thinking about it for another year.
For a detailed feature comparison, we've written a side-by-side breakdown of Fortium and IRIS that covers the specifics.