From the left hand side of the load and trim sheet the take off mass is the lower of the boxes A,B,C. in this case 61600.

The take off mass - operating mass (fuel+ DOM) 61600 - 49450 = 12150.

This is the maximum TL that could be carried.

The aircraft actually only has a TL of 11230.

There is an underload of 920 kg.