Cal. Civ. Proc. Code § 685.090

(a) Costs are added to and become a part of the judgment:
1. (1) Upon the filing of an order allowing the costs pursuant to this chapter.
2. (2) If a memorandum of costs is filed pursuant to Section 685.070 and no motion to tax is made, upon the expiration of the time for making the motion.
3. (3) As specified in Section 685.095.
(b) The costs added to the judgment pursuant to this section are included in the principal amount of the judgment remaining unsatisfied.
(c) If a writ or earnings withholding order is outstanding at the time the costs are added to the judgment pursuant to this section, the levying officer shall add the amount of those costs to the amount to be collected pursuant to the writ or earnings withholding order if the levying officer receives either of the following before the writ or earnings withholding order is returned:
1. (1) A certified copy of the court order allowing the costs.
2. (2) A certificate from the clerk of the court that the costs have been added to the judgment where the costs have been added to the judgment after a memorandum of costs has been filed pursuant to Section 685.070 and no motion to tax has been made within the time allowed for making the motion.
(d) The levying officer shall include the costs described in subdivision (c) in the amount of the sale or collection distributed to the judgment creditor only if the levying officer receives the certified copy of the court order or the clerk’s certificate before the distribution is made.