Alpha testing: all current functionality is free while VAT Engine is in active development

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Historical rate handling

Historical VAT rates API

A current rate is not always the right rate. VAT Engine stores rate validity windows so callers can request the rate applicable to a supply date.

What this helps you do

Handle refunds, audits, migrations, and delayed imports using date-aware tax inputs rather than silently substituting today’s rate.

  • Effective-date requests for supported VAT rates.
  • Validity windows are retained with versioned source data.
  • Historical context can accompany a calculation record.
  • Availability depends on the imported source coverage and is not a substitute for an official determination.