Hi there,
Got JAA's on Monday so I'll chip in.
In addition to what Maude Charlee posted which is your actual traffic load, your Allowed Traffic Load = Proposed Take-Off Mass - Dry Operating Mass - Take Off Fuel
Proposed Take Off Mass is calculated based on the lowest of
MSLM (or Performance Limited Landing Mass) + Trip Fuel
MSTOM (or Performance Limited Take Off Mass)
MSZFM + Take Off Fuel
Hope this helps further,
Sharky