and cannot prove that the tax levied by this chapter has been paid to his or her vendor, lessor, or other person or was paid on behalf of the purchaser by a dealer under subsection (4) is directly liable to the state for any tax, interest, or penalty due on any such taxable transactions.
The department may impose and collect the mandatory penalties from either the purchaser or the vendor that failed to obtain proper documentation at the time of the transaction.
Fla. Stat. § 212.07