No it is not a joke, it is set forth in a new presidential memorandum (via). Notice the order of the words; blocking tax cheats from 'government work', not 'working in the government'. From Obama's appointments who had tax 'issues', it would be comical if the order was the other way around. Having the same rule for both would be more appropriate.
"The Federal Government pays more than half a trillion dollars a year to contractors and has an important obligation to protect American taxpayer money and the integrity of the Federal acquisition process. Yet reports by the Government Accountability Office (GAO) state that Federal contracts are awarded to tens of thousands of companies with serious tax delinquencies. The total amount in unpaid taxes owed by these contracting companies is estimated to be more than $5 billion.
Too often, Federal contracting officials do not have the most basic information they need to make informed judgments about whether a company trying to win a Federal contract is delinquent in paying its taxes. We need to give our contracting officials the tools they need to protect taxpayer dollars.
Accordingly, I hereby direct the Commissioner of Internal Revenue (Commissioner) to conduct a review of certifications of non-delinquency in taxes that companies bidding for Federal contracts are required to submit pursuant to a 2008 amendment to the Federal Acquisition Regulation. I further direct that the Commissioner report to me within 90 days on the overall accuracy of contractors' certifications."