say that you wrote it over a year. then the income will be divided by that number of months. if they ask why you didn't tell them you were working say you didn't consider it work at the time and just decided to send it to a publisher on a whim. I don't know if they consider income quarterly or you can do yearly. you would have to ask someone else on that or ican go peek for you. I have nothing better to do right now lol. I would definitely want my back pay if I was you. edit. I did some research and it seems you can work while applying or appealing for ssdi as long as you only make or average a certain amount each month. if you go over that even if they approve they will reevaluate your approval so make sure the time period fits with the maximum allowable monthly income under ssdi rules