IRS to Sean Kingston — You’re Shorty on Your Taxes

It was back in ’09 … making money from his rhymes … but sadly Sean Kingston didn’t pay taxes on time … this according to the IRS.

According to official documents obtained by TMZ, Kingston — real name Kisean Anderson — stiffed Uncle Sam to the tune of $131,379.51 for the money he made in 2009 … the same year he released the album, “Tomorrow.”

The feds warned the singer, “We have made a demand for payment” … but since he failed to fork over the cash, the IRS obtained a lien on his property … which means, if he doesn’t pay up, the government can go after his stuff.

We’ve made repeated attempts to contact Sean’s reps for comment – but thus far, we’re getting the same treatment the IRS has gotten. A taxing effort with no results.