Interest Deduction for Balance Transfer Loans on Fund Investment

Dear all,

 

If I have a balance transfer offer from a credit card (e.g. 3% processing fee and 0% interest for 12 months), and I cash out this BT to invest in corporate bond fund at 6% yield also for 1 year, would I be able to deduct the 3% processing fee?

 

If possible, how may I prove that the loan and the investment are a pair?  By showing the transaction records that I received the BT cash and immediately invested in the bond fund?  Or show I open a new brokerage account?

 

Thank you very much!