Accreted income tax at maximum marginal rate imposes additional liability and interest for late payment. Accreted income of charitable or religious trusts is taxed at the maximum marginal tax rate, in addition to tax chargeable in the hands of a specified person. The specified trust or institution must pay this tax within the prescribed time; failure to do so triggers a simple interest charge on the unpaid tax for the period from the day after the due date until actual payment.