Dear Sir,
In reference to your query, please note as:
1. Your mother would be charging GST from the tenants and depositing the same to GST Authorities @ 18%. Hence total tax is net 18%.
2. Income Tax & GST are separate statutes. GST is not an income in the hands of your mother and therefore not a deduction either. Income tax has to be paid on total receipts booked as income subject to the deductions allowed under IT Act.
3. She would be eligible to carry forward the cost of construction in her ITR until the same is set off from her income, however it has to be seen as to how the classification is being done, i.e. as House property income of business Income.
4. From here my point 3 is answered. Since the property is classifiable as under House property, hence no dedcution of expense is allowed except:
a. Municipal taxes
b. Standard Deduction
c. Interest deduction, if any home loan is taken
5. Once again reiterating, GST is not an expense in your hands. You collect the same from tenants and deposit to govt. hence no burden on you.
6. It is suggested on my part to continue as an individual. Any other mode will increase compliances and that would not be viable at her age.
Please advise in case of any further clarification.
Thanks & Regards,
CA Aditya Dhanuka.