Last month, the IRS sent my wife and me a notice of deficiency. Here is a summary of the proposed changes for tax year 2015: an increase in tax by $79,950 and a substantial tax underpayment penalty of almost $16,000. The total amount they are requesting from me is over $95,000, in addition to what I have already paid for 2015. The good thing to note is that the letter states I may be able to resolve the dispute with the IRS. I have accurately paid my taxes and reported all the income I received. I do not agree with the IRS assessment in this letter. However, it's important to take these letters seriously, especially when they are certified. I have already sent a response today, hoping to avoid petitioning the tax court. The issue arose from a double reporting of income, and now it is my responsibility to inform the IRS about this mistake and help them adjust their records. I have sent a fax to the number provided and also mailed a letter to the PIO (Presiding Investigation Officer) listed on the form. In addition, I plan to call the IRS in a week or two. Looking at the letter, I realized there was a deadline of October 15, 2018, to contact them immediately. If I do not take any action, the IRS will demand the money from me, even though, by reviewing all the facts, they should not have any right to it. Fortunately, I want to thank Udemy, as they provided me with a letter explaining the situation to the IRS. As a Udemy instructor, they were responsible for the double reporting error. Udemy support did an outstanding job addressing this issue and providing me with the necessary documentation. Here's what happened: Udemy paid me on a 1099-MISC form, and the payments...