Future advances.

(1) Except as provided in subsection (3), if the mortgage, deed of trust, or other lien is recorded or executed after December 31, 1985, and secures future advances, as provided in s. 697.04, the nonrecurring tax shall initially be paid on the initial obligation secured, excluding future advances. Each time a future advance is made, additional nonrecurring tax shall be paid on the amount of the advance. However, any increase in the amount of original indebtedness caused by interest accruing under an adjustable interest rate obligation having an initial interest rate adjustment interval of not less than 6 months shall be taxable as a future advance only to the extent such increase is a computable sum certain when the original indebtedness is incurred.

(2) The trustee, if a deed of trust, or the owner of the obligation, if a mortgage or other lien, making the advance shall pay the additional tax to the clerk to whom the initial tax was paid. The clerk shall note the amount received upon the instrument, if one has been recorded, or shall otherwise give a receipt.

(3) If the mortgage, deed of trust, or other lien secures a line of credit, the nonrecurring tax shall be paid as provided in s. 199.135 on the maximum amount of the line of credit, except as limited by s. 199.133, and no further nonrecurring tax shall be due on any borrowing under the line of credit.