HMRC's published list of MTD-recognised software runs to around 600 products. For a UK owner-managed SME making a 2026 software choice, the practical shortlist is four: Xero, QuickBooks Online, FreeAgent, and Sage Business Cloud. Each covers MTD VAT (live since 2019) and MTD ITSA (from April 2026). The differences are in price, integration depth, UX, and the typical SME profile they fit best.
This piece compares the four on the dimensions that matter, with explicit recommendations for different SME profiles. Sister pieces in the MTD owner-managed SME hub cover the threshold eligibility test and the quarterly updates and the Final Declaration.
The four-way comparison
Xero: the market leader
Xero is the dominant SME accounting platform in the UK with the broadest app ecosystem and the deepest accountant network. Strengths: integration with practically every UK SME tool (Stripe, Square, Shopify, Dext, payroll providers, sector apps), strong multi-user permissions with role-based access, accountant collaboration mode, multi-currency. Weaknesses: monthly cost climbs for higher transaction volumes, occasionally over-featured for solo sole traders. Right for: any SME with employees, businesses with 1,000+ monthly transactions, businesses already working with a Xero-certified accountant.
QuickBooks Online
QuickBooks Online (QBO) is the second-largest UK platform, with slightly lower entry-level pricing than Xero and a marginally less mature UK app ecosystem. Strengths: clean UI for non-accountants, strong receipt-capture mobile app, competitive Self-Assessment integration for sole traders. Weaknesses: less depth on multi-currency and consolidations than Xero, occasional UK localisation gaps in newer features. Right for: sole traders, micro-businesses, established small Ltds that prefer the QBO interface.
FreeAgent: free with NatWest banking
FreeAgent is free for any business with a NatWest, RBS, Ulster Bank, or Mettle business banking relationship. For paying users it is £19 per month. Strengths: full Self-Assessment filing built in (the only major platform that includes the Final Declaration filing for free), strong UX for freelancers, integrated time tracking and invoicing, MTD ITSA-ready. Weaknesses: less depth than Xero for businesses with employees, weaker multi-currency, smaller third-party app ecosystem. Right for: freelancers, contractors, sole traders, single-director Ltds banking with NatWest group.
Sage Business Cloud
Sage is the established UK accounting brand with deep roots in the desktop SME market. The cloud product (Sage Business Cloud Accounting) is competitive but less differentiated than Xero or QuickBooks. Strengths: strong support for businesses migrating from Sage desktop, deep payroll integration, robust for businesses with CIS or other HMRC complications. Weaknesses: UX considered dated relative to Xero, smaller third-party app ecosystem. Right for: established SMEs migrating from Sage desktop, CIS-heavy construction businesses.
The recommendation matrix
- Freelancer / sole trader banking with NatWest: FreeAgent (free).
- Sole trader with other bank: QuickBooks Online (cheapest entry-level) or FreeAgent (£19).
- Single-director Ltd with employees: Xero or QuickBooks Online (Xero edges out for app ecosystem).
- Multi-employee SME with sector apps (Shopify, Square, etc.): Xero (deepest integrations).
- Construction business with CIS exposure: Sage Business Cloud or specialist CIS tool integrated with Xero.
- Property landlord with 1-3 properties: Hammock (landlord-specific) or FreeAgent.
What to test in a free trial
Every platform offers a 30-day free trial. The features to test specifically: bank feed setup with your actual bank, receipt-capture via the mobile app, sales invoice issuance, MTD VAT return preparation (if applicable), and the management reporting suite. The platforms feel similar in light use; differences emerge under real workflow load. A two-week trial running parallel to existing books is the cheapest insurance against picking the wrong platform.
Migrating between platforms
Migrating from Sage desktop to Xero, or from QuickBooks to FreeAgent, or any other combination, is a defined exercise: export the trial balance and chart of accounts, set the new platform's opening balances to match, recreate customer and supplier ledgers, and reconcile the first month carefully. Specialist migration services (Movemybooks, Accounting Migration UK) handle this for £200-£800. For DIY migration, allow 8-15 hours for a typical small business; the bottleneck is opening balance accuracy.
Accountant compatibility
The biggest practical constraint on software choice is often the SME's accountant. A Xero-trained accountant typically charges 30-50 percent more to work on a QuickBooks file because of the platform-switching overhead. Most accountancy firms specialise in one or two of the four major platforms; align your choice with your accountant's primary platform unless you are willing to accept higher fees or switch accountants.
When to upgrade plans
Entry-level plans on all four platforms have transaction limits or feature caps. Common upgrade triggers: hitting the bank transaction monthly cap, adding employees needing payroll, taking on multi-currency clients, needing project tracking, or growing to multiple users beyond the free tier. The upgrade path is usually one-click within the platform; switching providers because of a single upgrade need is rarely worth the disruption.
What about specialist sector tools?
Some businesses run a combination: a core accounting platform (Xero, QuickBooks) plus a sector-specific operations tool (Linnworks for e-commerce, Tradify for trades, Cliniko for healthcare). The sector tool integrates with the accounting platform via API or app store connector. This combination is typically more powerful than relying on the accounting platform alone for sector-specific workflows. Cost is additive but the value per platform is correspondingly higher.