While entering vouchers, you can post-date them, and Tally.ERP will not update the ledgers until the date in question. This is most useful for entering transactions that take place on a regular basis.
For example, if you pay for something by installments, you can set-up the payments in advance, and Tally.ERP will only enter them in the ledgers as they fall due. Mark vouchers ‘Post Dated’ by [CTRL] + [ T ] or click on the button. The button toggles with ‘Current’.