Final answer:
When annuity income benefits are paid to the annuitant, they are subject to regular income tax.
Step-by-step explanation:
When the monthly annuity income benefits are paid to the annuitant, they are subject to regular income tax. An annuity is a contract between an individual and an insurance company, where the individual makes regular premium payments and, in return, receives a stream of income payments in the future. These income payments are taxable as ordinary income for the annuitant.