The TB or P & L show all the postings that have happened in the financial year in regard to what Income or Expenditure you have had in the nominals.
The Expenditure/Income will be segregated into different sections as long as the correct type is marked against the correct nominals these will have the correct figures for each.
The different between the two will be the P & L balance and what is shown in the accumulated Profit and Loss.
Note: If you are running the first period of the new financial year TB and you haven't closed down the last financial year you will only have the value from the month no B/D balances from the previous years.