Holding gold, especially when it sits idle in a locker or at home, earns the owner zero interest income.
Unlike financial instruments such as Fixed Deposits, bonds and stocks, that can earn interest or dividend income, gold does not provide a recurring income.
Note: Purity and storage costs are not issues you need to worry about if you buy gold ETFs. However, even if you hold ETFs you will not get any interest income on your holding.
Also see: World's first gold-dispensing ATM