Field help:
Line 13 Losses from the sale of shares
Enter the unbalanced losses from the sale of shares according to line 13 in your tax statement.
If you wish to claim losses from the sale of shares, you must always submit the corresponding tax statement together with the tax return.
Note: If you had shares that have lost their value and have been written off from your custody account, the bank does not offset any losses. In other words, it does not put losses into the loss pot. This applies even if you only have one custody account through which you carry out all share transactions. It is mandatory that you include the losses from shares that have lost their value in your tax return.