Step 1: Fixed capital system.
Under the fixed capital system, capital accounts of partners remain fixed. Adjustments for drawings, interest, and profit/loss are recorded in Current Accounts.
Step 2: Normal balance of capital accounts.
Capital represents amount invested by partners in the firm. It is a liability for the firm, hence capital accounts normally show a credit balance.
Step 3: Conclude.
Therefore, when capital is fixed, partner’s capital accounts show a credit balance.
Final Answer:
\[
\boxed{\text{Credit balance}}
\]