How do I integrate with United Kingdom accounting software?

Apideck's Unified Accounting API lets you integrate with 12+ United Kingdom accounting platforms through a single API. Sign up, enable the connectors you need, and use one standardized data model to read and write invoices, payments, contacts, and more.

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United Kingdom accounting integrations

Q: What accounting software is popular in United Kingdom?

The most popular accounting platforms in United Kingdom include Xero, Sage Business Cloud Accounting, QuickBooks, FreeAgent, Kashflow. Xero and Sage lead cloud accounting for UK SMBs, with QuickBooks and FreeAgent strong among freelancers and micro-businesses, while Sage 50 retains a large desktop installed base. NetSuite, Dynamics 365 Business Central and Sage Intacct cover the mid-market, and Making Tax Digital requires VAT-registered businesses to file through compatible software.

Xero and Sage lead cloud accounting for UK SMBs, with QuickBooks and FreeAgent strong among freelancers and micro-businesses, while Sage 50 retains a large desktop installed base. NetSuite, Dynamics 365 Business Central and Sage Intacct cover the mid-market, and Making Tax Digital requires VAT-registered businesses to file through compatible software.

12 supported accounting platforms + 18 on the radar

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United Kingdom accounting software market

Where the major platforms sit and which Apideck supports today. Figures are company-reported unless marked as an estimate.

5.68M

UK SMEs (private-sector businesses)

ONS / DBEIS, 2025

~49%

of small businesses use accounting software

Xero UK Industry Report, 2025

Platform	United Kingdom market position	Apideck	Source
Xero	~1.1M UK subscribers	Supported	Xero FY24 results
QuickBooks Online	~270k UK users (est.)	Supported	AceCloud, 2026 (est.)
Sage Business Cloud Accounting	Within ~6.1M global customers	Supported	Sage FY24 results
FreeAgent	200k+ UK customers	Supported	FreeAgent / NatWest
KashFlow, ClearBooks UK, FreshBooks, Zoho Books	Long-tail SME / freelance	Supported	—
NetSuite, Dynamics 365 BC, Sage Intacct	Mid-market / ERP	Supported	—
Sage 50 / Sage 200	Large desktop / hybrid installed base	On the radar	—

Subscriber and customer counts are the best available public indicators and may include accountant-managed multi-entity accounts; they are not a direct count of distinct businesses. Estimates are marked accordingly.

United Kingdom accounting compliance requirements

The UK is phasing in Making Tax Digital, which already requires all VAT-registered businesses to keep digital records and file returns via compatible software, and will extend to Income Tax Self Assessment for sole traders and landlords from April 2026, alongside a separate Companies House reform mandating software-only, iXBRL-tagged accounts filing from April 2028.

Making Tax Digital for VAT

All VAT-registered businesses, regardless of turnover, must keep digital records and submit VAT returns using HMRC-compatible software with digital links between records.

HMRC, VAT Notice 700/22

Making Tax Digital for Income Tax

Sole traders and landlords with qualifying income above 50,000 pounds must use compatible software to keep digital records and submit quarterly updates from April 2026, with the threshold dropping to 30,000 pounds in 2027 and 20,000 pounds in 2028.

HMRC, GOV.UK guidance

Companies House software-only accounts filing

From April 2028, all UK registered companies must file their annual accounts in iXBRL format using commercial software, closing the web and paper filing routes.

Companies House, GOV.UK