Are you certain your mother-in-law has a life assurance policy and not an investment policy? There is a government levy of 1% on term life assurance premia. On investments made via investment undertakings or life assurance policies the investment can grow tax free until a chargeable event occurs. A chargeable event includes, inter alia, the ending of an 8-year period beginning with the inception of the life policy and each subsequent 8-year period beginning when the previous one ends.