Capium Review UK 2026 — In-Depth Analysis

Capium is a UK-only cloud practice suite that combines bookkeeping, accounts production, corporation tax, self assessment, payroll, practice management and CRM in a single integrated platform. It is HMRC-recognised for Making Tax Digital, hosted on Microsoft Azure, and sold module-by-module so practices only pay for what they use. This review covers how the suite works in practice, what the pricing looks like for a typical small or mid-sized firm, where Capium is strong, and where it falls short. Visit Capium for a free trial, or jump to the verdict at the end for the short answer.

Quick verdict

• Who it’s for: UK accounting practices and bookkeepers wanting one platform across compliance and practice management, rather than stitching Xero, IRIS and a separate workflow tool together.
• Who it isn’t for: Single-business owners who only need bookkeeping; international practices; firms with very high transaction volumes that need the responsiveness of a market-leading bookkeeping engine.
• Headline price: Suite base plans start at £140/month + VAT for up to 100 clients, with most modules priced from £20/month at the small-tier band. Bank feeds are charged at £1.50 + VAT per feed per month.
• MTD status: HMRC-recognised for MTD VAT, with MTD for Income Tax Self Assessment functionality in place ahead of the April 2026 mandate.

What is Capium?

Capium is a cloud-native accounting platform built specifically for UK accounting practices. The company is registered in England and Wales as Capium Limited (company number 08438321) and has stated it serves over 1,800 accounting firms, with internal materials referencing 3,000+ accountant users across the platform. It has been recognised in industry awards including Practice Suite of the Year 2020.

The product is structured as a unified suite of modules sitting on a shared client and ledger database. Each module (bookkeeping, accounts production, corporation tax, self assessment, payroll, practice management, CRM, company secretarial, time and fees, and CapiSign for e-signatures) can be bought individually or as part of a base plan. The architecture means client data flows from bookkeeping into accounts production and on into tax submissions without rekeying, which is the central pitch against the more common stack of separate cloud tools.

Capium is UK-only. The platform is built around HMRC and Companies House workflows, uses British tax legislation and pension auto-enrolment rules, and prices in pounds. There is no US, Australian or European edition. The target user is the small-to-mid UK practice (sole practitioners through to firms with 300 to 500 clients), with an Enterprise tier for larger firms. The platform is hosted on Microsoft Azure infrastructure and accessed entirely through the browser.

Pricing breakdown

Capium uses a two-part pricing model: a base plan banded by client count, plus add-on modules priced per band. All prices below exclude VAT and are taken from the published pricing page in May 2026.

Base suite plans

Plan	Monthly cost	Client capacity	Included
Small	£140/month	Up to 100 clients	Unlimited users, e-sign, SMS allowance, storage, free setup, support 6 days/week
Medium	£280/month	Up to 300 clients	As above, larger allowances
Large	£420/month	Up to 500 clients	As above, larger allowances
Enterprise	Custom quote	700+ clients	Custom contract

Standard modules (per band)

The core compliance modules (Accounts Production, Corporation Tax, Self Assessment, Payroll, Bookkeeping with MTD VAT, MTD for Income Tax, CapiSign) are priced separately:

Module band	Small (1-100)	Medium (101-300)	Large (301-500)
Standard module	£20/month	£40/month	£60/month

Premium modules

Practice Management, Company Secretarial, and Time and Fees sit at a higher tier:

Module band	Small	Medium	Large
Premium module	£40-50/month	£80-125/month	£120-167/month

Charity Accounts has a separate small-firm band starting at £20/month for up to 50 clients.

Other charges

• Bank feeds via TrueLayer: £1.50 + VAT per feed per month.
• Standard contract: 12 months, with 30 days’ notice to cancel.
• Free trial available on the suite.

Worked example

A 50-client sole practitioner buying the Small base plan plus Bookkeeping/MTD VAT, Accounts Production, Corporation Tax, Self Assessment and Payroll would pay approximately £140 + (5 x £20) = £240/month + VAT, before bank feeds. Adding Practice Management at the small-tier premium rate (£40/month) would lift this to around £280/month + VAT. With 30 connected bank feeds, total monthly cost would be in the region of £325 + VAT, or roughly £6.50 per client per month all-in.

A 250-client firm on the Medium plan running the same module set would land at £280 + (5 x £40) + £80 = £560/month + VAT for software, or about £2.25 per client per month before bank feeds. Per-client costs continue to fall as firm size grows, which is the structural reason Capium tends to look more competitive at mid-size than as a standalone for very small users.

Core features in depth

Bookkeeping

The bookkeeping module is the data foundation for the rest of the suite. It supports manual journal entry, sales and purchase invoicing, expense capture, customisable nominal coding, multi-currency handling, and bank reconciliation. Bank feeds are delivered through TrueLayer under PSD2 Open Banking, covering all the major UK high street banks including Barclays, HSBC, Lloyds, NatWest, RBS, Santander, Nationwide and the challenger banks. Transactions refresh once every 24 hours.

Invoices can be customised with the firm’s branding and emailed directly from the system. Recurring invoices, credit notes and partial payments are all supported. Customer statements, ageing reports and credit control workflows are built in. The bookkeeping module is what feeds VAT returns into the MTD VAT submission flow, and the trial balance into accounts production.

VAT handling supports the standard scheme, flat-rate scheme and cash accounting scheme, plus the Construction Industry Scheme reverse charge for affected sectors. Mixed-rate invoices, EC sales and partial exemption can all be handled, although practices doing complex partial exemption calculations may find themselves doing more work outside the system than in it. The MTD VAT submission flow is straightforward: the return is generated from the underlying records, reviewed on screen, and submitted to HMRC with one click.

Accounts production

Accounts production handles statutory accounts for limited companies (FRS 102, FRS 102 1A, FRS 105 micro-entity), partnerships, sole traders and charities (separate Charity Accounts module). The module includes integrated iXBRL tagging and is fully recognised by Companies House for direct online filing. Practices can also import an iXBRL trial balance from another provider and use Capium for tagging and submission, which is useful during a transition.

The workflow runs from trial balance, through working papers and review, to final accounts and Companies House submission, with version history retained against the client record. Disclosure notes are templated against the relevant standard, with editable text where firm-specific wording is needed. Comparative figures pull through automatically from the prior year once that year is closed in the system.

For charities, the separate Charity Accounts module handles SORP-compliant statements, with restricted and unrestricted fund tracking and the standard set of trustee report disclosures. Submissions to the Charity Commission still need to go through the Commission’s own portal, but the iXBRL output can be filed directly to Companies House for incorporated charities.

Corporation tax

The corporation tax module produces CT600 returns and supporting computations, handles supplementary pages, and submits directly to HMRC. It uses the figures coming from accounts production, so the chain from trial balance to filed return stays inside the suite. The module is updated for current UK Corporation Tax rates including the small profits rate at 19% and the main rate at 25%, with marginal relief calculations built in.

Self assessment

Self Assessment covers SA100 individual returns plus the main supplementary pages (self-employment SA103, partnership SA104, property SA105, capital gains SA108, employment SA102 and others). Returns are submitted directly to HMRC from inside the module. Capium has been building out MTD for ITSA functionality ahead of the April 2026 mandate, including quarterly update submissions for self-employment and property income above the £50,000 threshold.

The module pre-fills figures from the bookkeeping ledger where the client uses Capium for their own books, which removes the manual rekeying step that ITSA quarterly updates would otherwise add to the practice’s workload. For clients who do their own bookkeeping in another product, data can be brought in by trial balance import or CSV. The end-of-period statement and final declaration steps follow the same submission flow.

Payroll

The payroll module handles weekly, fortnightly, four-weekly and monthly pay runs, RTI submissions to HMRC (FPS and EPS), payslip generation, P60s, P45s, and year-end reporting. Auto-enrolment is built in: it tracks employee eligibility, manages opt-ins and opt-outs, and calculates pension contributions in line with current minimum rates. The module integrates with the bookkeeping ledger so payroll journals post automatically.

Statutory payments (SSP, SMP, SPP, ShPP, SAP) are calculated automatically from the employee record. Holiday pay, bonuses, commission, salary sacrifice and pension contributions are handled within the standard pay run. Year-end reporting includes P60 distribution, the final FPS and EPS submissions and the necessary returns for benefits in kind via P11D handling. Multi-employer payroll is supported, which matters for bureau-style practices running payroll for multiple client companies on behalf of those clients.

Practice management

The Practice Management module is the workflow layer. It includes a deadline calendar that pulls statutory dates from each client’s record, a task management system with reminders for overdue items, document management for sharing and authorising client files, and customisable client communications. Timesheets feed into the Time and Fees module for billable-hour tracking.

The deadline calendar is the most useful part of the module for compliance-heavy firms, with VAT, payroll, accounts, CT600 and SA100 deadlines all tracked from the underlying client record rather than being entered separately. Document management includes e-signature through the bundled CapiSign module, so engagement letters, accounts approval, tax return approval and similar documents can be sent and signed without leaving the system.

Where Practice Management is weaker than dedicated tools (Karbon, Senta, AccountancyManager) is in workflow templating and email triage. There is no native two-way sync with Outlook or Gmail of the kind Karbon centres its product on, so emails generally remain outside the system unless attached manually. Custom workflow templates exist but are less flexible than those in the dedicated practice management products.

CRM

The built-in CRM holds standing data for clients and prospects, including contact history, services taken, and onboarding status. It is not a replacement for a dedicated sales CRM, but for a small or mid practice tracking a pipeline of new client enquiries and existing client services it is functionally adequate and avoids the cost of a separate tool.

MTD and HMRC compliance

Capium is HMRC-recognised across the MTD programme. Specifically:

• MTD for VAT: Recognised. VAT returns submitted directly through the bookkeeping module; supports the £90,000 registration threshold (2025/26), the £88,000 deregistration threshold, and standard, flat-rate and cash schemes.
• MTD for Income Tax Self Assessment: Functionality in place ahead of the 6 April 2026 mandate. From that date, MTD for ITSA applies to anyone with qualifying gross income above £50,000 from self-employment or property, with the £30,000 threshold following in 2027 and the £20,000 threshold from April 2028. Capium handles the quarterly updates and end-of-period statement workflow.
• Corporation Tax: Direct CT600 submission to HMRC. MTD for Corporation Tax is not yet mandated by HMRC, with no implementation date set; Capium’s existing CT submission flow is the standard route.
• Companies House: Recognised supplier, with direct iXBRL filing for statutory accounts.
• PAYE/RTI: Recognised; FPS and EPS submissions handled within payroll.

Because the suite covers the full chain from underlying records through to HMRC and Companies House submission, there is no need for bridging software in the way some Excel-first practices currently use bridging tools for VAT.

Integrations

Bank feeds

Bank connectivity runs through TrueLayer under Open Banking. All major UK banks are supported, including Barclays, HSBC, Lloyds, NatWest, RBS, Santander, Nationwide, Bank of Scotland, Halifax, plus challenger banks Starling, Monzo, Tide and Revolut. Feeds refresh every 24 hours and are billed at £1.50 + VAT per feed per month.

Third-party apps

Capium’s third-party ecosystem is smaller than Xero’s or QuickBooks Online’s. The notable connections are:

• Receipt and expense capture: Direct integration is limited; many practices use a separate receipt-capture tool and import the data.
• Companies House: Direct filing for accounts and confirmation statements.
• HMRC: Direct submission for VAT, ITSA, CT600 and PAYE RTI.
• Trial balance import: Accepts trial balance imports from QuickBooks, Sage and Excel into accounts production, which makes onboarding clients from other systems straightforward.
• CSV import: Generic CSV import is supported across most modules.

Accountant tools

Because Capium is built for accountants, the practice-side workflow tools (multi-client dashboard, bulk actions, deadline tracking, e-signature via CapiSign) are part of the platform rather than third-party add-ons. This is a structural difference from Xero or QuickBooks, where comparable practice tooling tends to be bolted on or sourced from a separate workflow product.

Pros

• Native MTD VAT submission and HMRC-recognised across VAT, PAYE RTI, Self Assessment and Corporation Tax, with MTD for ITSA functionality in place ahead of the April 2026 mandate.
• Single integrated database means trial balance flows from bookkeeping into accounts production into CT600 without rekeying.
• Module-based pricing lets practices buy only the components they need, starting at £20/month per module on the small tier.
• Unlimited user licences on every base plan, removing the per-seat cost penalty common with Xero Practice Manager and Karbon.
• Companies House recognised supplier with integrated iXBRL tagging for direct accounts filing.
• Bank feeds via TrueLayer covering all major UK banks plus challenger banks, including Starling, Monzo, Tide and Revolut.
• Auto-enrolment handling built into payroll, including eligibility tracking and contribution calculations.
• UK-only focus means the legislation, tax codes and forms are kept current for British practices, with no overseas modules diluting the product.
• Free setup and onboarding included on every base plan, plus six-days-a-week support.
• Accepts trial balance imports from Xero, QuickBooks, Sage and Excel, which simplifies migration during the changeover period.

Cons

• The user interface has been reported by independent reviewers as feeling sluggish on the client side, with longer page-load times than the market leaders. Practices running high transaction volumes tend to feel this most.
• Adding multiple modules pushes the monthly cost up quickly; a small practice taking the suite plus four or five modules is well above what a single Xero or QuickBooks subscription costs for one client.
• The practice management workflow lacks native Outlook or Gmail email integration of the depth Karbon provides; email triage stays outside the system.
• The third-party app ecosystem is smaller than Xero’s or QuickBooks Online’s; specialist apps for things like CIS, stock control or industry-specific reporting are limited.
• Per-client pricing scales steeply for very large firms. Above 500 clients the Enterprise tier is custom-quoted and may not be the most cost-effective option compared with IRIS or CCH iFirm.
• Bank feed cost is itemised at £1.50 per feed per month rather than included; for a 100-client firm with two feeds per client this is a non-trivial line item.
• Reporting depth in some modules has been described by users as less polished than the equivalent in Sage or IRIS.
• Training new staff takes longer than on Xero or QuickBooks because the interface conventions are particular to Capium and not shared with the wider cloud bookkeeping market.
• Twelve-month minimum contract on the suite, with 30 days’ notice to cancel.

When to pick Capium

• A UK practice consolidating from a stack of separate tools (a bookkeeping platform plus a separate accounts production tool plus a separate payroll tool plus a separate practice manager) and wanting one supplier and one client database.
• A growing firm in the 50 to 300 client range where the per-client economics work and the suite-wide unlimited user licensing is genuinely useful.
• A practice that wants to do its own MTD for ITSA submissions in-house from April 2026 without bolting on a separate ITSA bridging product.
• A firm that wants a single supplier handling Companies House filing, HMRC submissions and payroll RTI through one integrated workflow.
• A practice that values UK-only product focus and current British legislation over the much larger global ecosystems of Xero or QuickBooks.

When NOT to pick Capium

• If you only need core bookkeeping for a single business, Xero or QuickBooks Online are simpler and have far larger ecosystems.
• If your practice runs heavily on email-driven workflow and triage, Karbon’s email-centric model will be a better fit than Capium’s practice management module.
• If you are an existing IRIS desktop user with strong investment in IRIS reporting and tax tools, IRIS Practice Management or Senta will integrate more naturally with your stack than Capium.
• If you need a deep specialist app marketplace (manufacturing inventory, complex e-commerce, multi-entity consolidation), Xero or QuickBooks Online plus a dedicated practice tool will give more flexibility than Capium’s narrower app set.
• If your firm is enterprise-scale with thousands of clients across multiple offices, CCH iFirm or IRIS Practice Management are more proven at that scale.
• If you need a true mobile-first product for sole-trader clients to use directly, Coconut, Countingup or FreeAgent are better-suited client-facing tools.

Comparable software

Capium sits at the crossover between core accounting software and dedicated practice management. UK alternatives fall on either side: Xero, QuickBooks Online, Sage Accounting and FreeAgent on the bookkeeping side; Karbon, Senta, IRIS Practice Management, AccountancyManager and CCH iFirm on the practice management side. Some firms use Capium as the all-in-one; others build a stack from a leading bookkeeping product plus a leading practice manager. The cards below show similar UK platforms drawn automatically from shared categories.

FAQs

Is Capium HMRC-recognised for Making Tax Digital?

Yes. Capium is HMRC-recognised for MTD VAT submissions and is on HMRC’s published list of MTD-compatible software. The platform also handles PAYE RTI, CT600 and Self Assessment submissions directly to HMRC, and has MTD for Income Tax Self Assessment functionality in place ahead of the 6 April 2026 mandate.

How much does Capium cost?

Suite base plans start at £140/month + VAT for up to 100 clients on the Small tier, rising to £280/month for up to 300 clients (Medium) and £420/month for up to 500 clients (Large). Standard modules including Bookkeeping, Accounts Production, Corporation Tax, Self Assessment and Payroll are priced from £20/month each on the small tier. Bank feeds via TrueLayer are charged separately at £1.50 + VAT per feed per month.

Is Capium suitable for a sole practitioner?

It can be, but the economics work best from around 30 to 50 clients upward. A sole practitioner with very few clients may find the suite plus modules expensive compared with a single Xero or QuickBooks subscription. Above 50 clients the per-client cost falls quickly and the integrated suite advantages start to outweigh the cost.

Does Capium handle MTD for ITSA from April 2026?

Yes. Capium’s Self Assessment module includes MTD for ITSA functionality, covering the quarterly update submissions and end-of-period statement workflow that apply to anyone with qualifying gross income above £50,000 from self-employment or property from 6 April 2026.

Which UK banks does Capium connect to?

Capium uses TrueLayer under Open Banking and connects to all the major UK high-street banks (Barclays, HSBC, Lloyds, NatWest, RBS, Santander, Nationwide, Bank of Scotland, Halifax) and the major challenger banks (Starling, Monzo, Tide, Revolut). Feeds refresh once every 24 hours.

Can Capium file accounts directly to Companies House?

Yes. Capium is a Companies House-recognised supplier, with integrated iXBRL tagging in the Accounts Production module and direct online filing to Companies House for statutory accounts and confirmation statements.

Can I import data from Xero, QuickBooks or Sage into Capium?

Yes. Capium accepts trial balance imports from Xero, QuickBooks, Sage and Excel into the Accounts Production module, and accepts CSV imports across most modules. This makes onboarding clients during a switchover simpler than starting from scratch.

Is Capium hosted in the UK?

Capium runs on Microsoft Azure cloud infrastructure. The platform is built and supported in the UK and is GDPR-compliant.

Does Capium include practice management or do I need a separate tool?

Practice management is included as a Premium add-on module within the suite, covering deadline tracking, task management, document storage, timesheets and a built-in CRM. For practices that rely heavily on email-driven workflow, a dedicated tool like Karbon may still be a better fit, but for many firms Capium’s built-in module removes the need for a separate practice management subscription.

How long is the Capium contract?

The standard suite subscription runs for 12 months with 30 days’ notice required to cancel. A free trial is available for evaluation before commitment.

How long does Capium take to set up?

Setup is included free with every base plan, and most small practices report being operational on the suite within a couple of weeks. Migration of existing client records and historical data takes longer and depends on the source system; trial balance imports from Xero, QuickBooks or Sage are quick, but moving full transactional history typically requires more hands-on work. Capium’s onboarding team handles this process directly during the free setup period.

Does Capium support CIS for the construction industry?

Yes. The bookkeeping module handles the Construction Industry Scheme reverse charge for VAT, and CIS deductions can be tracked against subcontractor records. CIS300 monthly returns are supported through the payroll module.

Final summary

Capium is one of a small number of UK-only platforms that genuinely covers the full compliance and practice management chain in one place. For a small or mid-sized British practice that wants to stop juggling Xero plus IRIS plus a separate payroll tool plus a separate workflow product, the suite proposition is real: one client database, one set of credentials, one supplier, and a workflow that runs cleanly from bookkeeping through accounts production to filed CT600 and statutory accounts. The HMRC-recognised status across VAT, PAYE, ITSA and CT, the Companies House integration, the unlimited user licensing and the UK-only product focus add up to a coherent fit for the practising accountant.

The trade-offs are real too. The interface is not as polished or as quick as Xero or QuickBooks at pure bookkeeping, the third-party app ecosystem is narrower, and adding multiple modules adds up to a meaningful monthly bill once a practice is taking the full suite. Firms with very high transaction volumes, heavy email-driven workflow, or a strong existing IRIS or Karbon investment may find a stack approach serves them better than Capium’s all-in-one. For everyone else in the small-to-mid UK practice market, Capium is one of the few credible single-supplier options worth shortlisting against the stack alternatives.