Free guide
Switching to cloud — without breaking VAT
How UK businesses with specialist VAT regimes can migrate from Sage 50, QuickBooks Desktop, and other legacy systems to cloud accounting without losing compliance, control, or sleep.
Last reviewed: 23 June 2026
What's inside
- 1
The migration that everyone's been delaying — and why specialist-VAT businesses get stranded on legacy platforms
- 2
The five things that go wrong: VAT scheme mapping, stock book loss, PE history disappearance, mid-year migration, MTD digital link
- 3
How OneSixth makes the migration safer — without doing the migration itself
- 4
Why the ledger choice becomes a technology decision, not a tax decision
- 5
Three ways to engage if you want to take a closer look
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Common questions
Why do specialist-VAT businesses get stuck on legacy desktop software?
Their scheme — margin, TOMS or partial exemption — is held together by spreadsheets, custom codes and historical workings that don't move cleanly, so fear of breaking compliance keeps them on Sage 50 or QuickBooks Desktop.
What's the risk of migrating mid-year?
Provisional calculations, stock books and recovery percentages all rely on a continuous record; a mid-year move can break that continuity and leave the year-end adjustment without the history it needs.
Does migrating break the MTD digital link?
It can — MTD for VAT requires an unbroken digital link to the return, and re-keying or copy-paste between systems can break it. The transfer needs to preserve digital links or use a compliant bridging step.
What happens to my margin scheme stock book when I switch?
Stock books often live outside the ledger and don't migrate, so the purchase history each item's margin depends on can be lost or orphaned — one of the five things the guide flags as most likely to go wrong.
Will switching platforms change my VAT scheme treatment?
It shouldn't — your scheme is a tax position, not a software feature — but the platform you choose decides how much manual work it takes. The guide's point: with the right tooling, the ledger choice becomes a technology decision, not a tax one.