<prompt> Human: Im a sole proprietor business and I usually use Turbo Tax to file. However, last year I got confused about something so did the thing where you send them an estimate of what youll have to pay and extended it till October. But now its 2018 and I still havent filed. How screwed am I? Should I get an accountant or something? Im not sure what to do?  <response>: If you overpaid youre not screwed at all. If you underpaid youll owe interest and penalties.You can still file for the previous year and you should do so. 