Reserving on Underwriting Year basis

Hi - does anyone have an example spreadsheet that shows reserving done on an underwriting year (UY) basis?



I think the key is to project both premiums and losses to ultimate and determine the ultimate loss ratio (ULR).



Then:



IBNR = EP x ULR - Incurred Losses



Is this correct?

And is this the only reasonable way to calculate IBNR on UY basis?

I guess we can incorporate B-F by considering the unreported %, but I was wondering if there was a fundamentally different approach...



Thanks in advance.

Reserving on Underwriting Year basis