Firm dissolution liability: partners remain jointly liable for tax and penalties; assessment and proceedings continue against them. Where a firm is dissolved or its business discontinued, the Assessing Officer shall assess the firm's total income as if no dissolution occurred and may apply all relevant provisions of the Act, including penalty provisions. Partners who were in office at dissolution, and legal representatives of deceased partners, are jointly and severally liable for tax, penalty or other sums; any proceedings already begun may be continued against those persons from their existing stage.