Jon Gosslin - a 3-Year-Old Tax Lien from 2009

Jon Gosselin became a free man in 2009 -- problem is, he allegedly snubbed the IRS in the process ... and now, the schlubby reality dad's been hit with a $39K tax lien.

If you recall, 2009 was the year Jon and Kate went splitsville ... scoring them both more publicity -- i.e. paid interviews and appearances -- than either could've imagined.

But according to docs filed in Berks County, Pennsylvania ... Jon still failed to dish out the necessary cash to Uncle Sam that year ... resulting in the massive tax bill.

http://www.tmz.com/2013/01/10/jon-gosselin-tax-lien/