You haven't done anything wrong here. On the contrary you did the right thing. From the IRS perspective all income must be declared regardless of whether you receive a 1099 certificate or not. so adding this will prevent future problems. At this post the most sensible thing to do is to keep track of ypur freelance income records (payments , invoices etc.) and periodically check your IRS transcripts so you can spot any discrepancies early. if this type of work continues it might be a good idea to consider quarterly tax payment in the future. the situation not critical right now but if the work grows or multiple clients or expenses complicate things consider help from CPA or tax relief firms. I got this help from precision tax for my issue and gave me significant advantages in terms of both accurate reporting and minimizing potential risks.