In In re Marriage of Garrity and Bishton (1986) 181 Cal. App. 3d 675, the court explained the excess earnings method as follows: "Pursuant to this method, one first determines a practitioner's average annual net earnings (before income taxes) by reference to any period that seems reasonably illustrative of the current rate of earnings. One then determines the annual salary of a typical salaried employee who has had experience commensurate with the spouse who is the sole practitioner or sole owner/employee. Next, one deducts from the average net pretax earnings of the business or practice a 'fair return' on the net tangible assets used by the business. Then, one determines the 'excess earnings' by subtracting the annual salary of the average salaried person from the average net pretax earning of the business or practice remaining after deducting a fair return on tangible assets. Finally, one capitalizes the excess earnings over a period of years by multiplying it by a factor equal to a specific period of years, discounted to reflect present value of the excess earnings over that period. The period varies according to factors such as the type of business, its stability, and its earnings trend."