Tax payment for Fy 19-20

Hello I have a query where I am working for an hospital ,for making payment of tax for FY 19-20 there are two companies prop and Pvt Ltd of same owner and two banks
now the query Pvt Ltd was not having funds in the last financial year of 19-20 but there is a liability to be paid.

Now the proprietor co has funds to pay tax for both the company's. so w how can pay tax for Pvt Ltd as thers is no fund in Pvt Ltd.













hope my question is clear.