Anything Krugman says usually has a 30 day expiration date.
The report says the extra money was "likely the result of major tax law changes at the federal and state level having a significant impact in the timing of revenue receipts."
That is: Taxpayers were paying a share of their bill early, getting income off their books in the hope of limiting exposure to the tax hikes that recently kicked in.
The administration was expecting that money to arrive in April. Now, officials are saying it won't, and that just as January's receipts soared, they'll be offset by a spring plunge.