Like Number5 said, you need to fill out the roster to 25 guys for every year. For example, you only have 20 players' salaries listed for 2015. I guess you could assume that those five additional players will all be making the league minimum but that's almost certainly not accurate. It is probably more like 18 or so for 2015 because you have Q and Ford listed (I doubt either are still around in 2015). Andino is listed for 2013 and 2104 but he is already gone. Jim Johnson also is not a free agent until after the 2014 season.
Baseball-Reference's projected future payroll (through 2015 at least) seems pretty accurate or at least in the ball park.
