I have bought a policy of sum insured of 2 lakh, a few years back and have cumulative bonus of Rs. 50,000; what would be the new sum insured after porting the policy to new insurer – 2 lakh or 2.5 lakh?
It would be 2.5 Lakh. For example – A person with insurer ‘X’ has a sum insured of Rs 2 lakh and cumulative bonus of Rs 50,000. When he shifts to insurer ‘Y’ his sum insured will automatically beRs 2.5 lakh. However, if insurer ‘Y’ has no product offering Rs 2.5 lakh as sum insured, it will have to offer the nearest higher slab of, say, Rs 3 lakh. While the premium will be charged on Rs 3 lakh, the portability benefits will be limited to Rs 2.5 lakh.

Source - PW.com