Mandate amount can be either fixed or maximum. Mandate amount limits depend on variant.
NACH Debit mandates require an amount. The amount is per transaction, therefore it is subject to the frequency of the mandate.
For eMandate API variant, the amount can be up to Rs 10 lakh (10,00,000 i.e. one million).
For eMandate eSign variant, the amount can be up to Rs 1 lakh (1,00,000 i.e. one hundred thousand).
For physical mandate variant, the amount can be up to Rs 1 crore (10,00,00,000 i.e. ten million).
A mandate must have a fixed amount or a maximum amount (one or the other, but not both).
Fixed amount (also known as Collection amount): The payment can be of this amount only, nothing more and nothing less.
Maximum amount: The payment can be any amount up to and including this maximum amount, nothing more.
When you create a mandate, you'll need to choose between 'Fixed amount' and 'Maximum amount'.
If the payments may vary from period to period, you should use 'Maximum amount'.
Increasing or decreasing the mandate amount: NACH Debit allows amendment to mandate amount on physical mandates. However, since mandate AMEND process is the same as mandate CREATE process (i.e. it requires the customer's signature on a paper mandate), it is easier to simply cancel the mandate and create a new one.