I want to deduct an additional amount in premium (AVBZ, AOV/AWW and/or BVZ) , is that possible?
Yes, it is possible to deduct additional AVBZ, AOV/AWW and/or BVZ premium.
Go to the specific employee and at the Taxes and premiums section click on Edit and after that, click on the specific premium. By choosing 'Yes' for the option 'Deduct extra employee premium?', you will be able to opt to deduct a fixed amount or a percentage.
See example AVBZ