No more R&R for me — back to the real world rather than a beach in the Caribbean. And nothing brings you back to reality like a little estimated tax. The fourth quarter 2010 payment is due on January 18th. That’s a postmark deadline, so if you spend the money for certified mail (which I strongly advise), your tax payment doesn’t have to get to the IRS (or your state tax agency) tomorrow.
You can also pay online, though EFTPS (the federal government’s tax system) requires registration (passwords are mailed to you) and it takes a day for payments to post.