California Code, Insurance Code - INS § 1775.8

(a) On and after January 1, 1994, and before January 1, 1995, every surplus line broker whose annual taxes for business done in calendar year 1992 or whose quarterly taxes for business done in calendar year 1993 exceed fifty thousand dollars ($50,000) shall make payment by electronic funds transfer.  On and after January 1, 1995, every surplus line broker whose annual taxes for business done in calendar year 1993 or in any calendar year thereafter exceed twenty thousand dollars ($20,000) shall make payment by electronic funds transfer.  The surplus line broker shall choose one of the acceptable methods described in Section 45 for completing the electronic funds transfer.

(b) Payment is deemed complete on the date the electronic funds transfer is initiated, if settlement to the state's demand account occurs on or before the banking day following the date the transfer is initiated.  If settlement to the state's demand account does not occur on or before the banking day following the date the transfer is initiated, payment is deemed to occur on the date settlement occurs.