1. succession certificate is clearly not applicable. I dont know who said that. It is required only for moveable assets like debts and securities.
2. you can choose from among heirship certificate or a LA
3. The court fees is the same for both
4. for the court fees you need to compute 50% value of the flat [which stood in your late mother's name] as per the stamp duty ready reckoner. Depending on the value so determined,the court fees will be calculated depending on which slab the market value falls in. The maximum court fees is capped at Rs. 75,000/-
5. apart from court fees, there is lawyer's professional fees which would vary from lawyer to lawyer. There is no fixed fee.
6. then comes clerkage which is required to be paid to the testamentary clerk whom the lawyer will engage for the liaison work in the Court's department/registry
7. the clerkage for heirship certificate/LA can be in the range of Rs. 20k to Rs. 40k max. Different clerks charge different fees.
8. then there is stamp duty and registration fee. If you go for a LA, then stamp duty will be nominal say Rs. 500/- on the transfer deed plus nominal registration fee. The registration agent charges will be anywhere between Rs. 10k to Rs. 15k.
9. if you go for an heirship certificate, then release deed will have to be registered. The duty is only Rs. 200/- and registration fee is nominal as above and agent charges same as above. By this release deed you will releasing your 25% share which you inherited from your mother's 50% share in favour of your sister such that she becomes 50% sharer.
10. the charges for drafting the release deed will have to be paid to the lawyer who would be engaged.
11. in my view some court fees on the heirship petition can be saved if the release deed is registered first
12. in my view it is preferable to go for an heirship certificate since its quicker than obtaining a LA which takes around 8 to 9 months
13. the charges for getting a LA would be different than for getting the heirship certificate
14. in a LA if there is consent of the legal heir of the deceased in favour of the application then no court hearing happens. However in case of an heirship petition there is a court hearing and the Court passes an order for granting an heirship certificate within 1 or 2 hearings itself. After that it is only departmental work which the court clerk handles to get the actual certificate
15. there are no taxes as such. Only the abovesaid charges.
16. as informed before the above is an expensive procedure but is actually the correct procedure which confers proper title on the legal heirs of the deceased owner, to her property and it would ensure that in future there is no problem, particularly by banks in case the purchaser has taken a home loan, as banks always insist for heirship certificate or LA
17. after the above procedure is done, you will have to submit the share transfer forms to the society for effecting the mutation in the joint names of yourself and your sister