Oh man - I've been there. We moved from New Jersey to New York and the organization we hired for payroll and insurance botched the worker's compensation for half a day - it started on the first of the month and we moved into our office on the afternoon of the 31st, the day before. Bam, $11,000 fine.
That took months to sort out, the officials I spoke to treated me like some sort of Snidely Whiplash cartoon villain, and we still ended up having to pay the folks up in Albany $1,000. Such a hassle over nothing.