Final answer:
When a corporation converts to an S corporation, it must adjust its inventory from LIFO to FIFO. The tax to be added to the C corporation tax liability is option 1) $140,000.
Step-by-step explanation:
When a corporation converts to an S corporation, it is required to adjust its inventory from the LIFO (Last-In, First-Out) method to the FIFO (First-In, First-Out) method. This is because the LIFO method is not allowed for S corporations. In this case, Lent Corporation had a LIFO inventory value of $510,000 and a FIFO inventory value of $650,000.
To determine the tax to be added to the C corporation tax liability for the year before the S election in 2019, you need to calculate the LIFO recapture amount, which is the difference between the LIFO and FIFO values.
LIFO recapture amount = FIFO inventory value - LIFO inventory value
= $650,000 - $510,000
= $140,000
Therefore, the tax to be added to the C corporation tax liability is $140,000.