Partners of any firm shall jointly and severally liable for payment of any tax, interest or penalty. Firm/ partner shall intimate the retirement of any partner to the Commissioner by a notice in writing – liability to pay tax, interest or penalty up to the date of such retirement, whether determined on that date or subsequently, shall be on such partner. If no intimation is given within one month from the date of retirement, the liability of such partner shall continue until the date on which such intimation is received by the Commissioner.