When you say "deduction", I assume you mean it in the sense of what is returned by APIs such as getaddressbalances? Because there is no absolute deduction in the blockchain sense until the transaction is confirmed.
If so I understand the request but you should understand that these APIs are taking account of unconfirmed transactions because they reflect the funds available for further spending.
Can you explain why you would want to consider unconfirmed transactions as if they have not yet deducted funds from the node's wallet?