I believe your information is incorrect. According to LawDog.com, here is the information in regards to interest and judgments:
Interest:
Legal rate: 6% per annum unless otherwise agreed upon between the parties in writing. (Sec. 334.01.)
Judgment rate: The rate of interest on judgment is determined by the court administrator on or before December 20th of each year based on the secondary market yield of one year United States treasury bills, for the most recent calendar month, reported on a monthly basis in the latest statistical release of the board of governors of the federal reserve system. (Sec. 549.09.)
So if you have a judgment against you, you are much better off paying it when it is done then to blow it off and wait for someone to garnish your wages! Again, from LawDog:
A judgment creditor may execute the judgment by levying on the real and personal property of the judgment debtor (Sec. 550.10.), including wages. Unless the judgment is for child support, the maximum part of the aggregate disposable earnings of an individual for any pay period subjected to an execution levy may not exceed the lesser of: (1) 25 percent of the judgment debtor's disposable earnings; or (2) the amount by which the judgment debtor's disposable earnings exceed 40 times the federal minimum hourly wages in effect at the time the earnings are payable, times the number of work weeks in the pay period. (Sec. 550.136.)