Can we issue debit and credit note for same invoice?

I am intending to purchase a flat for around one crore by taking a housing loan in the names of my husband and myself.
My mother likes to help me in this regard by disposing off her self acquired property and support me to the extent of 50% of the cost of the new flat.
If I include my mother's name as a third applicant of housing loan and register the new flat in the names of my mother and myself, can she claim exemption under section 54 of the Income Tax Act ?
Sale consideration of mother's house = 90 Lakhs as expected
Indexed Cost of Acquisition = 20 Lakhs
Capital Gain = 70 Lakhs
Cost of new flat = 100 Lakhs
Secondly, can my husband and I claim exemption u/s 80C and deduction u/s.24
I would be really grateful to you if you could help me in this regard.

How to account the following in the books of a company?
1) Out of an investment (long term) in one scheme in Mutual fund (NAV around Rs.10, assuming), the company switches a small portion of it to another scheme where the NAV is around Rs. 30.
2) Is there any tax implication for the difference like STCG?
3) If the company holds an investment which is considered as long term, and now the company goes into winding up in another 7 or 8 months (Dec'20), should this be reclassified as current investment as on 31-3-2020. If so,what should be the carrying cost of investment?

A company is in manufacturing activity. During the year, the company has also undergone Research and Development activities with prior approval of DSIR. It has incurred certain capital as well as revenue expenditure on R & D activities and claims deduction u/s 35(2AB) in the computation.

Kindly advise whether this would lead to Deferred Tax Asset / Liability?

SUPPOSE A PARTY WANTS TO CANCEL GST NUMBER AND WANTS TO FILE FINAL RETURN. BUT BEFORE THAT NUMBER IS ALREADY CANCELLED BY DEPARTMENT.

NOW, WE CAN DIRECTLY FILE FINAL RETURN OR WE HAVE TO REQUEST DEPARTMENT TO START NUMBER AND THAN TO DO CANCELLATION APPLICATION???

Sir/Madam,
One co-operative society has been assessed under section 143(3) and order was passed. Original Return was filed NIL and income was enhanced by AO. Order was passed wherein tax was charged along with interest. Now, credit of TDS was also provided in the order.
Let me brief
Demand Tax 2L
Interest 0.34L
Total Demand 2.34L
Less TDS 1.00L
Net Demand 1.34
Now, I want to ask the question is regarding the place where TDS credit can be availed in Schedule A or Part C of Vivad Se Viswash Scheme DTVSVS FORM 01. Kindly guide.

Dear Sir,
Is the extension of time line for investments till 30th June 2020, will be applicable for 80 IA also ?

Dear Experts,

I am preparing accounts for a firm which have made imports. Purchases made in May 2020 and payment will be made in July 2020
While recording the purchase in tally, the USD have to be converted into Indian rupee. Can you please suggest the link from which exchange rate to be taken for recording import transactions.

Dear sir,

I awarded an Independent residential home construction to a Pvt Ltd company , which amount around to Rs 2.5 crore, I am an Individual Taxpayer as per income tax, whether I liable to deduct TDS on every payment to the company

please advice me

Sir/madam,
Is e-way bill mandatory or not if supplier transfer inputs to job worker within state....not inter state?