Head-to-head: the comparisons firms ask about
IRIS Firm Management vs CCH iFirm
Both serve established UK practices with heavy compliance workloads, but the deciding factor is
rarely the workflow features. IRIS Firm Management wins where a firm already runs IRIS Accounts
Production and IRIS Personal Tax, because it shares one client database and pushes jobs straight
into production with no rekeying. CCH iFirm is cloud-first and modular, with practice management,
accounts production, tax and a client portal sold separately, and suits firms wanting to leave
desktop behind entirely. On billing, workflow and deadline tracking the two are broadly
comparable. Choose on which compliance stack you are already committed to, because moving
accounts production and tax history is far more disruptive than swapping the workflow layer.
IRIS Practice Engine vs CCH iFirm
Practice Engine is the heavier product, aimed at larger firms, and is materially stronger on
resource planning, capacity forecasting and partner-level profitability reporting. That is why it
turns up in Top 100 firms with multiple offices. CCH iFirm is lighter, cleaner and faster to
implement, which suits mid-size firms wanting solid workflow and billing without a six-month
deployment project. If you need multi-office resourcing and detailed WIP analysis, Practice
Engine has the depth. If you want cloud practice management live in weeks, iFirm is the
pragmatic choice.
TaxDome vs UK-native platforms
TaxDome is excellent at the client-facing half of the job: a branded portal and mobile app,
reusable job pipelines, automated emails, e-signatures, questionnaires and invoicing that trigger
as work moves through a stage. Where it falls short for UK practices is compliance. It does not
produce UK statutory accounts or file corporation tax returns, so it must sit alongside TaxCalc,
IRIS or Sage. Firms whose pain is client collaboration and job automation rate it highly. Firms
wanting one system covering workflow and filing usually land on Capium or CCH iFirm instead.
Karbon vs AccountancyManager
Karbon is the better collaboration tool, with email triage, shared inboxes and comment threads
that keep client conversations attached to the job. AccountancyManager is the better UK
compliance tool, with deadlines calculated automatically from Companies House and HMRC, and AML
and onboarding workflows built for institute review. Larger or more process-driven firms tend to
prefer Karbon; UK small practices drowning in record chasing tend to prefer AccountancyManager.