Thanks for you response! That was very helpful. So I contacted the company and turns out it was in fact not a mistake, but they sent the check to an old address of mine so I never received the money. They reissued the check and I received it this month and deposited it. They said they won't issue a new 1099, so the 1099 will be for 2016. So do I pay taxes on it next season when I file my taxes for this year, or do I need to amend the old return? The date of the check is from this month.
