What is the main difference between interest and principal repayment in loan account?

Correct answer: Interest is expense and principal repayment reduces liability

The direct answer is A. In a retiring partner’s loan account, principal means the original amount of loan or the unpaid amount transferred to the loan account. Repaying principal reduces the outstanding liability, so the loan balance becomes smaller. Interest is the charge for using the money for a period; it is an expense of the firm. If interest is due but unpaid, it increases the amount owed, while payment of interest settles that expense-related liability. Option A is correct because it distinguishes expense from reduction of loan liability. Option B is wrong because neither interest nor principal repayment is a sale; no goods are sold. Option C is wrong because drawings are amounts withdrawn by a partner for personal use, not loan interest or repayment. Option D is wrong because goodwill is a business value used in reconstitution, not the nature of every loan transaction. The step-by-step distinction is: identify interest as time-based finance cost; identify principal as the amount borrowed; interest affects expense, principal payment reduces the loan balance. Memory cue: interest is the cost of borrowing; principal is the amount borrowed.