Computation of net winnings defines formulas to determine taxable online gaming winnings and withholding obligations. Net winnings from online games are computed by prescribed formulas for annual netting and for first, subsequent and closing withdrawals to determine taxable winnings for section 115BBJ and withholding under section 194BA. Computations use aggregate withdrawals, non taxable deposits, opening and closing balances and previously taxed winnings, with net winnings floored at zero where non taxable amounts and earlier taxed winnings offset withdrawals. Definitions cover non taxable and taxable deposits and withdrawals; multiple user accounts are aggregated; transfers between a user's accounts with the same intermediary are ignored; payments in cash or kind outside the account are treated as simultaneous taxable deposits and withdrawals; exclusive promotional credits usable only for play are ignored until recharacterised.