Hi. What is the difference between Box 16 and Box 26 on an NR4 slip? When entering my gross income into TurboTax, am I supposed to add the numbers in both boxes together to get my total gross income? Would my total gross income be the numbers in Box 16 on all of my NR4 slips added together PLUS the numbers in Box 26 on all of my NR4 slips added together?