Yes, 'Carry Forward' and 'Accumulation' of leaves essentially refer to the same concept under the labor laws of most Indian states, including Karnataka and Maharashtra. Both terms refer to the practice of allowing employees to retain unused leaves for use in the next calendar year, up to a specified limit. In the context of the Karnataka and Maharashtra Shops and Establishment Acts, this limit is set at 45 days.
The difference between the two terms is more linguistic than legal. 'Carry Forward' implies the action of moving something (in this case, unused leaves) from one time period to the next. 'Accumulation', on the other hand, suggests the action of gathering or amassing something (again, unused leaves) over time.
As your colleague rightly pointed out, if you have accumulated 45 days of leave by the end of the year, you will not be credited with the full quota of fresh leaves on 1st January of the next year. Instead, any leaves in excess of the 45-day limit will be forfeited. Therefore, to avoid losing out on leaves, it is advisable for employees to avail their leaves before they reach the accumulation limit.
I hope this clarifies your query. Feel free to reach out for any more information.
https://labour.kar.nic.in/labour/acts-rules.htm