You can configure Tally.ERP 9 to prompt you with a warning when the Cash ledger reaches a negative balance.
● Go to Gateway of Tally > Accounting Vouchers.
● Set the option Warn on negative cash balance to Yes in F12: Configure screen .
● Accept the screen to save.
For example, let us assume there is a cash balance of Rs.25000 and you need to make a payment of Rs.26000 towards Advertising expenses. This results in a negative cash balance. The Payment entry is displayed as shown:
Tally.ERP 9 prompts you with a negative cash warning message and the credit cash balance in RED Colour. This will help you to decide whether to proceed with the entry or not.