Step 1: Meaning of Share Forfeiture.
When a shareholder fails to pay allotment or call money, their shares may be forfeited. The amount already received from such shareholders is transferred to the “Share Forfeiture A/c”.
Step 2: Nature of balance.
The balance in this account represents capital profit, because it arises from forfeiture of shares and not from regular trading activities.
Step 3: Presentation in Balance Sheet.
Since it is treated as capital profit, it is shown under the head “Reserves and Surplus” in the Balance Sheet until reissue of shares.
Step 4: Conclude.
Thus, the balance of Share Forfeiture A/c is shown under Reserves and Surplus.
Final Answer:
\[
\boxed{\text{Reserve and Surplus}}
\]