current tax payable webform - Split closing balance into assets and liabilities to map to TAR

Summary: Currently, the OOTB current tax payable webform has a net closing balance. The client requires the ability to split this into 2 columns; assets (where balance > 0) and liabilties (where balance < 0). and map these respectively to the TAR as they have separate accounts for income tax payable vs receivable. Please advise how the asset vs liability can be made in the current tax payable webform so that we can map it to the relevant accounts using the TAR automation. Thanks.

I have managed to get the asset vs liability split using a member formula, however i don't think this is a feasible solution as this negatively impacts the TAR automation and amounts do no come through to the TAR.