Got a penalty from the IRS for late filing of business taxes of $1,950 for a 2-man LLC. We dissolved the company back in July Were we supposed to file immediately?

They've charged us $195.00 per month, implying that we were 5 months late.

We only made $2,000 that whole year, so I'm very reluctant to shell out that much for a late penalty. Anyone know why this happened, and is there anything I can do? We filed during tax season for two prior years with no problems.