Final answer:
To calculate the corporation's current earnings and profits for year 1, add back disallowed expenses and subtract deferred gains to the net operating loss.
Step-by-step explanation:
To calculate the corporation's current earnings and profits for year 1, we need to adjust the net operating loss by adding back the disallowed entertainment expense and the tax-exempt income, and subtracting the deferred gain on the installment sale.
Net operating loss = -$500,000
Disallowance of entertainment expense = +$20,000
Tax-exempt income = +$10,000
Deferred gain on installment sale = -$250,000
Current earnings and profits for year 1 = -$500,000 + $20,000 - $10,000 - $250,000 = $(740,000)