There shall be exempt from all excise taxes imposed by chapter 201 all promissory notes, nonnegotiable notes, and other written obligations to pay money bearing dates subsequent to July 1, 1957, when the maker thereof is a security dealer registered by the office under this chapter and when such promissory note, nonnegotiable note or notes, or other written obligation to pay money shall be for the duration of 30 days or less and secured by pledge or deposit, as collateral security for the payment thereof, security or securities as defined in s. 517.021, provided all excise taxes imposed by chapter 201 shall have been paid upon such collateral security.
Fla. Stat. § 517.32