Answer:
John should include $1,600 as rental income on his Year 4 tax return as a result of the $2,000 payment.
Step-by-step explanation:
As a cash-basis taxpayer, John's taxable income is based on the actual cash receipts and payments made in the accounting period. The refundable part of the rent should not be included as rental income since it is a security deposit that would be returned at the end of the lease period. If John were an accrual-basis taxpayer, the rental income to be included would have been only $800 representing income for Year 4.