Valuation of life interests and reversions requires a registered valuer to report assets, assumptions, computations, and a declaration. Form O-10 requires a registered valuer to report purpose and date of valuation, particulars of the interest-holder and life tenant(s), the exact legal nature of the interest with supporting instruments, full details of trust fund assets, advances, liabilities and income, the computation of the estimated share including margins and assumed estate duty, the valuation formula and assumptions on mortality and interest, the actuary's value, and a signed declaration of accuracy and no direct or indirect interest in the subject interest.