There is no such law. However, if you are paying a very low salary, say Rs 4000, and of this, you pay Rs 1000 as Basic, then authorities are likely to take the entire amount as Basic as it is less than the Minimum Wages. We can argue that the law does not prescribe, but the law needs to be examined in totality and not in fragments.
Let us examine these two scenarios:
1. Company is restricting PF Contribution to Rs 6500 as prescribed under the PF Act. Assume Minimum Wages in the State where your Company is located are Rs 5500. Let us assume again that the Company pays a Basic of Rs 3000 and DA of 1000 and pays other allowances of 4000, making the total Rs 8000 as wages. Even though there is no legal provision for fixing Basic at a percentage, here is a case where the Basic plus DA is lower than the prescribed minimum wages. Definitely, Authorities will question and insist on deducting contributions at least up to the Minimum Wages level. Legally, PF Authorities are not the inspectors for Minimum Wages, and we can question their authority. But legally, they can refer the matter to the concerned authorities, and they, in turn, can take action.
2. Company is not restricting the contribution to Rs 6500. Assume that the Total wage is Rs 20000. Of this, Rs 7000 is paid as Basic and Rs 2000 as DA. The balance is paid as HRA and Medical Allowance. The percentage of Basic plus DA is lower than 50%. Authorities do not question the percentages here as you are already contributing much higher than the legal requirement.
Thanks,
Regards, T Sivasankaran