Bad or doubtful debt interest income is taxed as business income when credited or received, whichever is earlier. Special provision governs the taxation of interest income arising from bad or doubtful debts of specified financial institutions. The interest is chargeable under the head Profits and gains of business or profession in the tax year in which it is credited to the profit and loss account or actually received, whichever is earlier. The provision applies to public financial institutions, scheduled banks, co-operative banks other than excluded categories, State Financial Corporations, State Industrial Investment Corporations, and notified classes of non-banking financial companies.