Per VAT category: VAT amount = taxable amount × rate (±0.01 rounding tolerance).
Calculate at category level from the taxable amount, don't sum per-line VAT.
BT-116 VAT category taxable amountBT-117 VAT category tax amountBT-119 VAT category rateBG-23 VAT breakdownThe Billhorse validator checks XRechnung, ZUGFeRD and Factur-X right in your browser — your file is never uploaded.
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Rule source: EN 16931 / XRechnung (KOSIT) or Billhorse check (BH-*).