9F58
Offline Accumulator Balance (M/Chip)Offline Accumulator Balance is Mastercard's M/Chip Advance application tracking a second cumulative offline-spending total on the card, distinct from the general Offline Balance (9F50, referenced alongside it) already covered in this dictionary and related to two further M/Chip-proprietary counters (CA and C6). M/Chip Advance's risk-management design deliberately keeps more than one offline accumulator so an issuer can enforce more than one independent spending ceiling at once - a card can be near its limit on one accumulator while comfortably under on another, and 9F58 is specifically the second of those parallel totals rather than a duplicate of 9F50. This is Mastercard M/Chip-proprietary data, not part of the core EMV specification, so a generic terminal or decoder built only against Book 3 won't recognise 9F58 at all; a terminal actually enforcing M/Chip Advance's offline risk logic needs Mastercard's own M/Chip documentation to know what this second accumulator is actually tracking and how it interacts with 9F50. See Mastercard M/Chip Advance Issuer Guide.
Interactive decoder
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Binary (6): 000000050000
This tag is not a bitmap; the decoder shows a format-based interpretation.
Decoded example
Example value: 000000050000
Properties
| Tag | 9F58 |
|---|---|
| Name | Offline Accumulator Balance (M/Chip) |
| Format | Binary |
| Length | 6 bytes |
| Source | Card (ICC) |
| Templates | — |
| Books | Mastercard M/Chip |
Frequently asked questions
- What is EMV tag 9F58?
- Offline Accumulator Balance is Mastercard's M/Chip Advance application tracking a second cumulative offline-spending total on the card, distinct from the general Offline Balance (9F50, referenced alongside it) already covered in this dictionary and related to two further M/Chip-proprietary counters (CA and C6). M/Chip Advance's risk-management design deliberately keeps more than one offline accumulator so an issuer can enforce more than one independent spending ceiling at once - a card can be near its limit on one accumulator while comfortably under on another, and 9F58 is specifically the second of those parallel totals rather than a duplicate of 9F50. This is Mastercard M/Chip-proprietary data, not part of the core EMV specification, so a generic terminal or decoder built only against Book 3 won't recognise 9F58 at all; a terminal actually enforcing M/Chip Advance's offline risk logic needs Mastercard's own M/Chip documentation to know what this second accumulator is actually tracking and how it interacts with 9F50. See Mastercard M/Chip Advance Issuer Guide.
- What format and length does EMV tag 9F58 use?
- Tag 9F58 uses the Binary format and is normally 6 bytes long.
- Is tag 9F58 provided by the card or the terminal?
- Tag 9F58 (Offline Accumulator Balance (M/Chip)) is provided by the Card (ICC).
Sources
- MChip - Advance Issuer Guide (201710), p. 358
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