Investing in PPF through a spouse (after gifting money) can lead to tax-free interest income, even if clubbed under the primary earner's income, due to PPF's tax-exempt nature.
"Instead of that, if she invests that money in a PPF, what will happen? Let's understand. Did he gift that money to his wife? Was this inadequate consideration? Yes. Ideally, will that be clubbed up under Chandu's name? Yes, Agrade. So what has happened? She invested that money in PPF. Will she get interested in that? Yes. Will that interest get clubbed up in Chandu's hands? Yes. But interest on PPF is tax free. So, anyway it will be as good as Chandu will not have to pay any tax on that amount."