Understand the lock created by VAT and OSS filing
Filing VAT or OSS protects the accounting period behind that filing.
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Review the explanation
- Open the VAT overview.
- Find What happens when I mark a return as filed? in the frequently asked questions.
- Review the filing effect before confirming a return.
Cybooks maintains one tax-lock date at the latest filed VAT or OSS period end. Filing an older return afterwards does not move that date backwards. Completing a VIES return does not advance it.
Viewing the overview does not lock a period. If a later accounting change is blocked by a filed period, use the correction process appropriate to that filing; an ordinary editing permission does not remove the tax lock.