SAF-T is the most effective data architecture audit tool that most finance functions have ever been subjected to — not because it was designed as an audit tool, but because it requires the organisation to produce a structured, complete, internally consistent representation of its financial data that the tax authority can examine at transaction level. This requirement, applied to ERP systems that were not designed for this level of structured output, reveals architectural failures that have been invisible to finance teams for years.

The failures that SAF-T exposes fall into three categories. The first is mapping failures: the organisation's chart of accounts does not map cleanly to the SAF-T standard account taxonomy because the chart of accounts was built for management reporting purposes and contains accounts that have no standard tax equivalent, accounts that combine multiple tax treatments, and accounts that have been used inconsistently across entities. Producing a valid SAF-T mapping requires resolving every ambiguity in the chart of accounts — which means making accounting policy decisions that were deferred when the chart was built.

The second is completeness failures: the SAF-T schema requires fields that the ERP does not consistently populate. Supplier tax registration numbers that were never entered. Customer VAT numbers that were entered in free-text format rather than validated format. Document reference numbers that were populated manually and inconsistently. Transaction dates that do not match the tax point dates because the posting process did not enforce the distinction. Each of these gaps must be remediated before the SAF-T file can be produced without errors.

The third is consistency failures: the same underlying transaction is represented differently in different parts of the ERP. The sales invoice that generated the output tax appears in the VAT ledger, the accounts receivable ledger, and the general ledger — but the amounts do not reconcile because of timing differences, currency rounding, or posting logic that was not designed for cross-ledger consistency. SAF-T requires consistency. The ERP was not designed to enforce it.

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