9F50

Offline Balance is the primary available-balance figure M/Chip 4 (and later M/Chip Advance) cards maintain for offline risk management - the headline number an issuer's offline spending controls are built around, related to the further M/Chip-proprietary counter CA and, in cards running the Advance variant, to the second parallel accumulator already covered in this dictionary (9F58). Because it's Mastercard M/Chip-proprietary data rather than a core EMV tag, its exact accounting semantics - what specifically increments or decrements it, and under what conditions - live in Mastercard's own M/Chip specifications rather than in EMV Book 3, and a generic dictionary entry can state that it exists and what it broadly tracks without asserting the precise internal accounting rules a decoder would need corroborated against that scheme documentation, consistent with this field's own verificar vigencia flag pending that cross-check. A terminal enforcing offline spending limits against a card that also runs 9F58 needs to understand both balances are in play, not just this primary one. See Mastercard M/Chip 4 Card Application Specification.