<prompt> Human: I do some side work and today i finally got the 1099. Thing is, Ive already filed my taxes and Ive already received my refund.How do I pay taxes on this income? O dont want the IRS giving me a fun audit  <response>: Not too big of a deal. However, depending on when you received the payment, you may be due penalties and interest for not paying estimated taxes on that income. Go look into filing a 1040X. 