income tax

Salaam alaykom,I started a co mpany last year. i could not pay income tax that year because it was my first year. Therefore I had to keep it in the bank. This year I will have to pay the income tax of last yaer with interst. My question is can i use the interest the bank gave me to pay the interest the tax authorities will charge me with?And a second answer is piggelatine haram?Thanks alot for the answers.