The first estimated payment for it is due on November 2. I've seen no publicity about this tax, so it does seem to have been sneaked into place; it was enacted May 9, 2009. Here is what a colleague posted about it to one of the editing-related e-mail lists that I subscribe to:
[Here] is the Web site [with] information for the self-employed: [The MCTMT] applies to the five counties of the City of New York plus Rockland, Nassau, Suffolk, Orange, Putnam, Dutchess, and Westchester counties, for net earnings with $10,000 as the threshold point. (Below that figure, you don't have to worry about this.) The tax rate is .34% (.0034) of total net earnings within the geographic area listed above. That's $34 on $10,000. We are supposed to calculate this and make estimated tax payments starting on November 2, 2009. See the Web site above for all the details.
Please check with your accountant.
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