Field help:
Share of tradesmen' services (Wife)
The percentage share of the maximum amount for the wife will be calculated and shown here, based on the percentage share already assigned to the husband.
The maximum amount is generally divided equally between both parents.
However, you can also choose any other assignment. For example, the husband could claim 100% of the maximum amount for himself. In this case, attach a joint informal application for this with your tax return.