You don't report your income and gains/ losses based on the filing deadline in April or Oct. Everything goes by the calendar year that ends on Dec 31. The 1099 forms get mailed to you by Jan 31 or for investments they might not come until late February. You have to wait to file until you get all the forms. And with investments watch out for them to mail you corrected forms later. So don't file right away or you may have to do an amended return to correct it.
