CA Rev & Tax Code Section 4225

The redemption certificate for a redemption under this article shall show:

(a)

The amounts used to arrive at the redemption amount at the time of an election to pay delinquent taxes in installments;

(b)

The portions of the redemption amount and interest previously paid, including all credits allowed;

(c)

The portion of the redemption amount and interest required to make the redemption.