Step 1: Meaning of drawings.
Drawings mean the amount withdrawn by partners for personal use from the firm.
Step 2: Interest on drawings.
When partners withdraw money, they must pay interest to the firm. This interest is an earning for the firm.
Step 3: Accounting treatment.
Interest on drawings is recorded as income for the firm and credited to Profit and Loss Appropriation Account.
Step 4: Conclude.
Thus, interest on drawings is treated as income for the firm.
Final Answer:
\[
\boxed{\text{Income}}
\]