rental income from state Bank of India, food corporation of India, state Bank of India mutual fund, united India insurance corporation of india

Respected Sir, We are being separate HUFs and having separate Pan are co-owners of building and are made separate TDS under Income Tax Act. Our each HUF rental income does not exceed Rs. 20 Lacs . Only each HUF's total rent received from SBI added is above 20 Lacs. How to clarify our tenants that we are not liable for GST. Please clarify the same at an earliest.