How banks compute MAB penalty
- Tiered: HDFC, ICICI, Axis — penalty rises with how much you fell short (e.g., 50%+ short = ₹450–600 + GST; 25% short = ₹250–350).
- Pro-rata: Kotak charges roughly 1% of the shortfall amount, capped.
- Flat: Some PSBs (small accounts) charge a fixed ₹100–150 per month regardless.
- RBI capped MAB penalties at the cost-of-providing-the-service in 2014, but actual amounts vary widely.
The easiest avoidance: keep a slightly higher MAB cushion or shift to a no-MAB account (SBI Regular Savings, BSBDA, salary accounts, digital banks).