Step 1: Nominal Value of Shares.
500 shares at Rs. 10 each equals Rs. 5,000.
Step 2: Reissue Price.
Shares reissued at Rs. 8 per share total Rs. 4,000.
Step 3: Discount on Reissue.
Discount = Rs. 5,000 (nominal value) – Rs. 4,000 (reissue price) = Rs. 1,000.
Step 4: Adjustment from Share Forfeiture Account.
The maximum allowable discount on reissue is transferable from the Share Forfeiture Account. Consequently, Rs. 1,000 shall be debited to the Share Forfeiture Account.
Final Answer: \[\boxed{\text{Rs. 1,000 will be debited to Shares Forfeiture A/c.}}\]