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Capium is a cloud-based practice management suite that combines bookkeeping, payroll, tax filing, document management, and a client portal in one platform. It is designed primarily for UK accounting firms and includes HMRC-integrated tax submission features.

Firms use Capium to manage client work from onboarding through to tax filing and invoicing without switching between separate tools. The platform covers self-assessment, corporation tax, VAT returns, and payroll submissions, all with direct HMRC filing capabilities. Its document management and client portal modules handle the collection and storage of supporting records.

Capium is best suited for UK practices that want a single platform covering both compliance work and practice management. Firms that need more advanced workflow automation or serve clients outside the UK may find they need additional tools alongside it.

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