Capium vs QuickBooks Online UK 2026: Which Should You Choose?

Hero summary

Capium and QuickBooks Online are two very different answers to the same question: how should a UK accountant or business handle bookkeeping, VAT and the wider compliance chain in 2026. Capium is a UK-only practice suite that bundles bookkeeping, accounts production, corporation tax, self assessment, payroll and practice management into one platform sold to accounting firms. QuickBooks Online is Intuit’s cloud bookkeeping platform aimed primarily at UK businesses themselves, with a deep app marketplace and a free practice portal for accountants. Both are HMRC-recognised for Making Tax Digital. This comparison sets out where they overlap, where they diverge, and which scenarios each platform is the right fit for. Visit Capium for a free trial of the suite, or visit QuickBooks Online for a 30-day trial of the bookkeeping platform.

Quick verdict

Capium is best for UK accounting practices wanting a single integrated suite covering bookkeeping, accounts production, tax filing and practice management under one supplier and one client database.

QuickBooks Online is best for UK SMEs, sole traders and limited companies wanting market-leading cloud bookkeeping with strong mobile apps, a deep app ecosystem and a free practice portal that accountants can layer over the top.

No overall winner is declared. The two products solve different jobs and many practices use both, sitting QuickBooks Online files inside the Capium client database for accounts production and tax.

At a glance comparison

Feature	Capium	QuickBooks Online
Primary buyer	UK accounting practices	UK businesses (with practice portal)
Headline price	From £140/month base + £20/module on Small tier	From £10/month (Sole Trader)
Pricing model	Suite base plan + per-module add-ons	Per-business subscription (5 tiers)
User licences	Unlimited on every base plan	1 to 25 depending on plan
Country focus	UK-only	UK-localised (separate from US edition)
Deployment	Cloud (Microsoft Azure)	Cloud, with iOS/Android mobile apps
Bookkeeping	Yes (suite module)	Yes (core product)
Accounts production (FRS 102/105)	Yes (integrated module)	No (third-party tool needed)
Corporation tax (CT600) filing	Yes (integrated module)	No
Self Assessment (SA100) filing	Yes (integrated module)	No (estimate only on Sole Trader plan)
Payroll	Yes (suite module)	Yes (Standard or Advanced add-on)
Practice management	Yes (Premium suite module)	Limited (QuickBooks Online Accountant portal)
MTD for VAT	HMRC-recognised	HMRC-recognised
MTD for ITSA (April 2026)	Functionality in place	On HMRC recognised list
CIS for construction	Yes	Yes (Essentials and above)
Multi-currency	Yes	Essentials and above only
Bank feeds	TrueLayer (£1.50 + VAT per feed/month)	Open Banking (included)
Third-party app marketplace	Limited	~700 UK-relevant apps
Mobile app	Browser-based	Native iOS and Android
Minimum contract	12 months, 30 days notice	Monthly rolling

Pricing compared

The two pricing models are not directly comparable because Capium is sold to a practice for many clients and QuickBooks Online is sold per business. The fairest comparison is at the level of the practice’s total monthly bill for serving a representative book of clients, plus the per-business cost where the client themselves carries the licence.

Capium pricing in detail

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

Capium plan	Monthly cost	Client capacity
Small	£140/month	Up to 100 clients
Medium	£280/month	Up to 300 clients
Large	£420/month	Up to 500 clients
Enterprise	Custom	700+ clients

Standard modules (Bookkeeping with MTD VAT, Accounts Production, Corporation Tax, Self Assessment, Payroll, MTD for ITSA, CapiSign) cost £20/month on the Small tier, £40/month on Medium and £60/month on Large. Premium modules (Practice Management, Company Secretarial, Time and Fees) sit at £40-50, £80-125 and £120-167/month respectively. Bank feeds via TrueLayer are charged at £1.50 + VAT per feed per month. The standard contract is 12 months with 30 days notice to cancel.

QuickBooks Online pricing in detail

QuickBooks Online uses a per-business subscription model with five tiers. List prices for May 2026, excluding VAT:

QuickBooks plan	Monthly cost	Users	Notable inclusions
Sole Trader	£10/month	1	Self Assessment estimate, no VAT returns
Simple Start	£16/month	1	VAT and MTD submission
Essentials	£33/month	3	VAT, multi-currency, CIS
Plus	£47/month	5	Adds project profitability
Advanced	£115/month	25	Adds custom fields, batch invoicing

Standard Payroll is £4/month + £1 per employee paid; Advanced Payroll is £8/month + £1 per employee paid. Intuit frequently runs 50% to 75% off promotions for the first three to six months, after which list pricing applies. Practices buying through QuickBooks Online Accountant access discounted ProAdvisor pricing they can absorb or rebill. There is no minimum contract.

Worked example: 50-client UK accounting practice

Take a sole practitioner with 50 small business clients, all needing VAT, payroll for one or two staff each, year-end accounts and CT600.

Capium route: Small base plan £140 + Bookkeeping/MTD VAT £20 + Accounts Production £20 + Corporation Tax £20 + Self Assessment £20 + Payroll £20 + Practice Management £40 = £280/month + VAT. Add 50 bank feeds at £1.50 each = £75/month. Total around £355/month + VAT, or roughly £7 per client per month, with the practice carrying the bill.

QuickBooks Online route: Each client carries their own subscription, typically Essentials at £33 + Standard Payroll £4 + £2 per employee, so around £39-£41/month per client. Across 50 clients that is £1,950 to £2,050/month at list price (often 50% lower in promotional periods, then stepping up). The clients pay this directly. The practice then pays separately for accounts production and CT600 software, typically TaxFiler, Capium or VT, costing the firm a further £100 to £400/month depending on volume.

The Capium route concentrates cost in one supplier paid by the firm; the QuickBooks Online route distributes cost across each client and adds a separate accounts and tax tool for the practice. For a firm in the 50 to 300 client range with mainstream limited company clients, Capium is usually cheaper per client all-in once accounts production and CT600 software are factored in. For a firm with very mixed software preferences across its book or where clients prefer to own their own subscription, the QuickBooks Online route is more flexible.

Feature-by-feature

Bookkeeping and invoicing

Capium: The bookkeeping module supports manual journals, sales and purchase invoicing, expense capture, multi-currency handling and bank reconciliation. Recurring invoices, credit notes, partial payments, customer statements and ageing reports are all built in. The data feeds directly into accounts production and tax modules. Independent reviewers have noted the interface can feel less responsive than market-leading bookkeeping engines on heavy transaction volumes.

QuickBooks Online: The bookkeeping engine is one of the strongest in the UK market. Bank feeds run through Open Banking with daily refresh, rules engines auto-categorise based on payee, amount or account, and machine-learned suggestions improve over time. Bulk-confirm actions speed up high-volume reconciliations. Invoicing supports estimates, recurring schedules, branded templates, progress invoicing on Plus and Advanced, and embedded Pay Now links via QuickBooks Payments, GoCardless or PayPal.

How they compare: QuickBooks Online has the edge on day-to-day bookkeeping speed and reconciliation automation. Capium is competent but its bookkeeping engine is one component of a larger suite rather than the central product.

VAT and MTD

Capium: HMRC-recognised for MTD VAT. Supports the standard, flat-rate and cash schemes, the £90,000 registration threshold, and CIS reverse charge. Returns are generated from the underlying ledger, reviewed on screen and submitted with one click. MTD for ITSA functionality is in place ahead of the 6 April 2026 mandate, including quarterly updates and end-of-period statement workflow.

QuickBooks Online: HMRC-recognised for MTD VAT since the 2019 mandate. VAT setup walks through scheme selection, registration date and reverse charge defaults. The return screen is drillable to underlying transactions per box, which speeds the review pass. The VAT exception report rolls prior-period adjustments into the current return automatically. Postponed VAT accounting on imports is supported. QuickBooks Online is on the HMRC recognised list for MTD for ITSA and has been part of the pilot.

How they compare: Both meet the standard for MTD VAT and both have credible ITSA pathways. QuickBooks Online’s VAT review interface is more refined for everyday submission. Capium’s advantage is that ITSA quarterly updates can flow from the same ledger that feeds the practice’s accounts production and self assessment final declaration.

Accounts production

Capium: Full accounts production for limited companies (FRS 102, FRS 102 1A, FRS 105 micro-entity), partnerships, sole traders and charities. iXBRL tagging is integrated and the module is recognised by Companies House for direct online filing. Trial balance imports from Xero, QuickBooks, Sage and Excel are supported, which makes onboarding straightforward. Comparative figures roll forward from the prior year automatically.

QuickBooks Online: No native statutory accounts production. UK firms typically pair QuickBooks Online with TaxFiler (now part of IRIS), Capium itself, VT Final Accounts or BTCSoftware to produce filed accounts.

How they compare: This is a category Capium occupies and QuickBooks Online does not. Any practice using QuickBooks Online for client books still needs a separate accounts production tool to file at Companies House.

Tax (CT600 and self assessment)

Capium: Corporation Tax module produces CT600 returns and supporting computations, handles supplementary pages and submits directly to HMRC, with current rates including the 19% small profits rate, 25% main rate and marginal relief built in. Self Assessment covers SA100 plus the main supplementary pages (SA103, SA104, SA105, SA108, SA102) with direct HMRC submission.

QuickBooks Online: Does not file Corporation Tax returns. Sole Trader plan provides a Self Assessment estimate across the year but does not file the SA100 final declaration end to end. Practices route CT600 and SA100 filing through TaxFiler, Capium, BTCSoftware or similar.

How they compare: Capium files; QuickBooks Online estimates and reports. For a practice serving limited company clients, this is the structural difference that pushes many firms toward Capium as the back-end even if the client-facing books sit in QuickBooks Online.

Practice management

Capium: The Practice Management premium module includes a deadline calendar pulling statutory dates from each client record, task management with reminders, document management with e-signature through CapiSign, and customisable client communications. Timesheets feed into the Time and Fees module. The deadline calendar is the most practically useful piece for compliance-heavy firms. It is weaker than dedicated tools (Karbon, Senta, AccountancyManager) on workflow templating and email triage and has no native two-way Outlook or Gmail sync.

QuickBooks Online: QuickBooks Online Accountant is a free practice portal that centralises every client subscription in one login, with batch reclassification, journal templates, undo functionality and a books review feature. It is functional rather than full practice management. Mid-sized practices typically pair it with Karbon, Senta or AccountancyManager for client tasks, deadlines and document collection.

How they compare: Capium ships practice management as part of the suite; QuickBooks Online provides a portal for managing books across clients and assumes the firm uses a separate workflow tool if it needs deeper task and deadline tracking.

Reporting

Capium: Reports cover the standard P&L, balance sheet, trial balance, VAT and ageing across the bookkeeping module, with consolidation between modules into the working papers and final accounts. Reporting depth in some modules has been described by users as less polished than Sage or IRIS equivalents.

QuickBooks Online: Reporting library covers P&L, balance sheet, trial balance, general ledger, VAT exception and detail, A/R and A/P aging, sales by customer or product, and budget vs actual on Plus and Advanced. Custom reports save into a personal library and can be packaged into management report packs. Comparative periods toggle on most financial reports. Advanced adds a more flexible report builder, custom fields as filterable dimensions, and scheduled email delivery.

How they compare: QuickBooks Online has the deeper management reporting toolkit at the books level. Capium’s strength is in linking the books through to formal accounts, not in slicing the books for management reporting.

Integrations

Capium: Bank feeds via TrueLayer cover all major UK banks and challengers including Barclays, HSBC, Lloyds, NatWest, RBS, Santander, Nationwide, Starling, Monzo, Tide and Revolut, refreshed every 24 hours. Direct integrations are limited beyond banking, Companies House and HMRC. Third-party app ecosystem is narrower than QuickBooks Online or Xero.

QuickBooks Online: Around 700 UK-relevant apps in the marketplace covering e-commerce reconciliation (A2X, Link My Books), document capture (Dext, AutoEntry), credit control (Chaser, Satago), inventory (Unleashed, DEAR, Cin7), CRM (Capsule, Pipedrive, HubSpot), time tracking (QuickBooks Time, Harvest) and direct debit (GoCardless). Bank feed coverage spans Barclays, HSBC, Lloyds, NatWest, RBS, Santander, Nationwide, Co-operative Bank, TSB, Bank of Scotland, Metro Bank, Starling, Monzo, Tide, Revolut Business and Wise, plus American Express card feeds.

How they compare: QuickBooks Online wins on ecosystem breadth, especially for e-commerce sellers and any business that needs specialised add-ons. Capium’s narrower app set is a deliberate consequence of being a UK practice suite rather than a horizontal platform.

Support

Capium: Free setup and onboarding included with every base plan. Support is available six days a week. UK-based support team. The 12-month minimum contract means evaluation needs to happen during the free trial period.

QuickBooks Online: Phone, chat and online help. Customer support quality is reported by users as variable; phone callbacks can be quick but technical depth on UK-specific issues is inconsistent. Monthly rolling subscription means switching out is straightforward.

How they compare: Capium’s support model is more aligned with the needs of an accountant onboarding a new platform; QuickBooks Online’s is more typical of a mass-market SaaS product.

MTD and compliance comparison

Both platforms are HMRC-recognised across the relevant Making Tax Digital streams and both have credible pathways to the April 2026 ITSA mandate.

MTD for VAT: Both Capium and QuickBooks Online are on the HMRC published list of MTD VAT compatible software. Both submit returns directly through the API rather than via bridging, both handle the standard, flat rate and cash accounting schemes, and both support the £90,000 registration threshold and the £88,000 deregistration threshold for 2025/26.

MTD for Income Tax Self Assessment: The mandate applies from 6 April 2026 to anyone with qualifying gross income above £50,000 from self-employment or property, with the £30,000 threshold following in April 2027 and the £20,000 threshold from April 2028. Capium has built ITSA functionality into the Self Assessment module, covering quarterly updates and end-of-period statement workflow. QuickBooks Online has been part of the HMRC pilot, appears on the recognised software list, and the Sole Trader plan is positioned as the entry product for ITSA quarterly updates. Advisers should confirm specific feature readiness for cash basis, jointly held property and excluded categories at go-live for either platform.

Corporation Tax: Capium files CT600 directly to HMRC. QuickBooks Online does not. MTD for Corporation Tax is not yet mandated and HMRC has not set an implementation date.

PAYE RTI: Both are HMRC-recognised. Capium handles FPS and EPS within payroll. QuickBooks Online does the same through its Standard and Advanced Payroll add-ons.

Companies House: Capium is a recognised supplier with direct iXBRL filing. QuickBooks Online does not file at Companies House.

The headline difference: Capium is recognised across the full chain (VAT, ITSA, Corporation Tax, PAYE RTI and Companies House) under one supplier. QuickBooks Online is recognised for the bookkeeping-side compliance (VAT, ITSA, PAYE RTI) but stops short of Corporation Tax and statutory accounts.

Integration ecosystems

Capium’s ecosystem is built around the UK compliance chain. Direct connections to HMRC for VAT, ITSA, CT600 and PAYE RTI; direct filing to Companies House for statutory accounts and confirmation statements; bank feeds via TrueLayer; trial balance import paths from Xero, QuickBooks, Sage and Excel into accounts production; CapiSign e-signature bundled into the suite. Receipt and expense capture is limited as a direct integration; many practices import from a separate receipt-capture tool. The narrowness of the app marketplace is a deliberate trade-off, since the suite delivers most workflows in-house rather than via add-ons.

QuickBooks Online’s ecosystem is far broader and more horizontal. The marketplace covers around 700 UK-relevant apps, with particular depth in e-commerce reconciliation (A2X and Link My Books for Amazon, Shopify and eBay), document capture (Dext, AutoEntry), inventory (Unleashed, DEAR, Cin7), credit control (Chaser, Satago), time tracking (QuickBooks Time, Harvest, Tracking Time), direct debit (GoCardless) and CRM (Capsule, Pipedrive, HubSpot). For UK e-commerce sellers in particular, the A2X and Link My Books integrations turn weeks of manual marketplace reconciliation into a single posted journal per settlement period. This breadth is one of the strongest reasons UK e-commerce businesses default to QuickBooks Online.

Where the two ecosystems overlap is in banking and HMRC connectivity. Both connect to all the major UK high street and challenger banks; both submit MTD VAT and PAYE RTI directly. Where they diverge is everything beyond that: Capium covers more of the compliance chain in-house, QuickBooks Online covers more of the operational stack via third-party connectors.

Pros and cons of each

Capium pros

• HMRC-recognised across MTD VAT, PAYE RTI, Self Assessment and Corporation Tax, with MTD for ITSA functionality in place
• Single integrated database flows trial balance from bookkeeping into accounts production into CT600 without rekeying
• Module-based pricing lets practices buy only what they need, starting at £20/month per module on the Small tier
• Unlimited user licences on every base plan
• Companies House recognised supplier with integrated iXBRL tagging
• Bank feeds via TrueLayer covering all major UK banks and challengers
• Auto-enrolment built into payroll
• UK-only focus keeps legislation and forms current
• Free setup and onboarding included; six-day-a-week support
• Trial balance imports from Xero, QuickBooks, Sage and Excel

Capium cons

• Interface can feel sluggish on the client side compared with market leaders
• Suite plus modules adds up quickly for very small practices
• Practice management lacks native Outlook or Gmail email integration
• Smaller third-party app ecosystem than QuickBooks Online or Xero
• Bank feeds itemised at £1.50 per feed per month
• Per-client pricing on the Enterprise tier may not be cost-effective above 500 clients versus IRIS or CCH iFirm
• 12-month minimum contract with 30 days notice to cancel
• Training new staff takes longer because interface conventions are particular to Capium

QuickBooks Online pros

• Native UK product with sterling base currency, UK VAT schemes and built-in CIS on Essentials and above
• HMRC-recognised for MTD VAT and on the recognised list for MTD for Income Tax
• Bank feed coverage across all major UK high street banks and challengers, refreshed daily
• Strongest mobile experience of the major UK cloud platforms for receipt capture and mileage
• Around 700 third-party apps in the marketplace
• Practice portal (QuickBooks Online Accountant) is free with discounted ProAdvisor pricing
• Multi-currency on Essentials, Plus and Advanced
• Project profitability and budget vs actual reporting on Plus
• Standard and Advanced Payroll add-ons are HMRC-recognised
• Monthly rolling subscription with no minimum term

QuickBooks Online cons

• List pricing has risen materially over recent years; promotional rates often double or triple at month four
• Multi-currency locked to Essentials and above; Simple Start users with foreign sales must upgrade
• No native Self Assessment SA100 or partnership SA800 filing
• No native CT600 or statutory accounts production
• Inventory on Plus is light; stock-heavy businesses need Unleashed, DEAR or Cin7 alongside
• Sole Trader plan is a separate SKU from Simple Start; migrating on incorporation is not always seamless
• Customer support quality varies on UK-specific issues
• Bank feed reconnection occasionally needed when banks update Open Banking consent windows

Pick Capium if…

• You are a UK accounting practice consolidating from a stack of separate tools (a bookkeeping platform, a separate accounts production tool, a separate payroll tool and a separate practice manager) and want one supplier
• Your firm is in the 50 to 300 client range where the per-client economics of the suite work and unlimited user licensing is genuinely useful
• You want to do MTD for ITSA submissions in-house from April 2026 without bolting on a separate ITSA bridging product
• You want a single supplier handling Companies House filing, HMRC submissions and payroll RTI through one workflow
• You value UK-only product focus and current British legislation over the larger global ecosystems of Xero or QuickBooks Online
• You want practice management included rather than as a separate subscription

Pick QuickBooks Online if…

• You are a UK limited company with VAT, occasional foreign currency sales and 1 to 10 employees on payroll
• You are a sole trader plumber, electrician or contractor who needs CIS, mileage and receipt capture in one mobile app
• You want a wide third-party app marketplace, particularly for e-commerce reconciliation through A2X or Link My Books
• You are an accounting practice that already supports a Xero stack and want a second platform to serve clients who prefer QuickBooks
• You need MTD for VAT today and a credible MTD for Income Tax pathway from April 2026 without changing software
• You want a monthly rolling subscription rather than an annual commitment

Pick neither if…

• You want a true freelancer-first product with a built-in accountant on monthly subscription, in which case Crunch or Ember pair software with an included accountant in a way neither Capium nor QuickBooks Online does
• You are a contractor or freelancer banking with NatWest or Mettle and want bookkeeping at no extra cost, in which case FreeAgent is free with those bank accounts
• You are a UK practice already heavily invested in the IRIS desktop ecosystem with strong reporting and tax tooling in place, in which case IRIS Practice Management or Senta will integrate more naturally with your stack than Capium
• You are a landlord with multiple buy-to-let properties wanting per-property profit reporting designed for the sector, in which case Hammock is purpose-built where neither platform is
• You are an enterprise-scale firm with thousands of clients across multiple offices, in which case CCH iFirm or IRIS Practice Management are more proven at that scale
• You want a market-leading UK cloud bookkeeping engine that the wider accountant community is already trained on for client-side use, in which case Xero is often the easier shortlist alongside QuickBooks Online

Comparable software

Capium and QuickBooks Online sit on opposite sides of the UK accounting software landscape: Capium as a UK practice suite, QuickBooks Online as a cloud bookkeeping product with broad SME appeal. The natural alternatives also split into two camps. On the practice suite side, Capium competes with Karbon and Senta for workflow-heavy firms and with IRIS Practice Management or CCH iFirm for larger practices wanting deeper accounts and tax production tooling, plus AccountancyManager for firms wanting a lighter cloud-first option. On the bookkeeping side, QuickBooks Online competes most directly with Xero, with Sage Accounting as the third major incumbent, FreeAgent for freelancer-leaning use cases, Zoho Books as a value-led suite alternative, and KashFlow for UK practices with a longer-standing channel relationship. Many firms run both: QuickBooks Online for client-side bookkeeping, Capium (or Xero plus a separate accounts production tool) for the practice’s compliance back-end.

FAQs

Can I use Capium and QuickBooks Online together?

Yes. Many UK practices keep client books in QuickBooks Online and import the trial balance into Capium for statutory accounts production and CT600 filing. Capium accepts trial balance imports from QuickBooks, Xero, Sage and Excel, which makes this a common workflow.

Which is cheaper for a small UK accounting practice?

For a practice with around 50 limited company clients on mainstream compliance work, the Capium suite plus core modules typically lands between £280 and £355/month for the firm, including bank feeds. QuickBooks Online costs the client around £33 to £47/month per business, which the client usually pays directly, plus a separate accounts production tool that costs the practice £100 to £400/month. Capium tends to be cheaper per client when the practice carries the full bill; QuickBooks Online plus a tax tool tends to be cheaper for the practice itself because the client pays the bookkeeping subscription.

Are both HMRC-recognised for MTD?

Yes. Both Capium and QuickBooks Online are on the HMRC published list of MTD-compatible software for VAT and both appear on the recognised list for MTD for Income Tax ahead of the April 2026 mandate.

Does QuickBooks Online file CT600 returns?

No. QuickBooks Online does not file Corporation Tax returns or statutory accounts. Limited company users pair it with TaxFiler, Capium, BTCSoftware, VT Final Accounts or another filing tool for CT600 and Companies House submissions.

Does Capium replace bookkeeping platforms like QuickBooks Online?

It can, since Capium includes its own bookkeeping module. In practice, many businesses prefer QuickBooks Online for the day-to-day client-facing bookkeeping experience because of its mobile app and app marketplace, and the practice uses Capium behind the scenes for accounts production and tax. Both approaches are valid.

Which platform is better for MTD for ITSA from April 2026?

Both have functionality in place. Capium’s advantage is that ITSA quarterly updates can flow from the same ledger that feeds the practice’s accounts production and final declaration. QuickBooks Online’s advantage is that the underlying bookkeeping experience for the sole trader is more polished. For practices wanting one platform across the chain, Capium is more efficient. For sole traders running their own books, QuickBooks Online’s Sole Trader plan is the entry product.

How long are the contracts?

Capium runs on a 12-month minimum contract with 30 days notice to cancel. QuickBooks Online is a monthly rolling subscription with no minimum term, although promotional pricing typically commits the user to list pricing once the introductory period ends.

Do both connect to UK banks?

Yes. Capium uses TrueLayer under Open Banking and connects to all major UK high street banks (Barclays, HSBC, Lloyds, NatWest, RBS, Santander, Nationwide, Bank of Scotland, Halifax) plus challengers (Starling, Monzo, Tide, Revolut). QuickBooks Online’s bank feed list adds Co-operative Bank, TSB, Metro Bank, Wise and American Express card feeds. Both refresh roughly daily.

Which has the better app ecosystem?

QuickBooks Online has the much larger marketplace at around 700 UK-relevant apps, with particular depth in e-commerce, document capture, inventory, credit control and CRM. Capium’s app set is narrower because the suite handles most accountant-side workflows in-house rather than via add-ons.

Is either platform UK-only?

Capium is UK-only with no US, Australian or European edition. QuickBooks Online has a dedicated UK edition that is genuinely distinct from the US version, with sterling base currency, UK VAT schemes, CIS and HMRC payroll, although the underlying global codebase is shared with other regions.

Final summary

Capium and QuickBooks Online are not direct head-to-head competitors in the strict sense, even though both appear in the core accounting software category. Capium is a UK-only practice suite designed for accountants, covering bookkeeping, accounts production, corporation tax, self assessment, payroll and practice management under one supplier and one client database, with a 12-month commitment and module-based pricing. QuickBooks Online is a cloud bookkeeping product designed primarily for UK businesses themselves, with the strongest mobile experience in the category, around 700 third-party apps and a free practice portal that accountants layer over the top.

For a UK accounting practice in the 50 to 300 client range wanting one platform across the compliance chain, Capium is one of the few credible single-supplier options worth shortlisting. For a UK SME, sole trader or limited company wanting market-leading cloud bookkeeping with a deep app marketplace and a credible MTD pathway from April 2026, QuickBooks Online remains a defensible choice. Many practices use both, sitting QuickBooks Online files inside the Capium client database for accounts production and tax. Visit Capium for a free trial of the suite, or visit QuickBooks Online for a 30-day trial of the bookkeeping platform.