It makes sense to add spouse as co-owner as it helps in enhanced loan   eligibility and provides tax benefits to both co-borrowers on interest   and principal repayment. Also, succession of a jointly owned property is   smoother compared to the lengthy process involved in case of single   ownership. 
Here are four benefits of owning a house jointly.
Lowers stamp duty
One of the significant additional expenses that a buyer has to bear while buying a house is stamp duty and registration fee for registration of property papers in the buyer's name. 
However,   "you may prefer to have your wife's name as the first owner as it can   help you save a lot of money towards paying the stamp duty
In   many states, stamp duty fees for registration of property is higher for   male buyers and lower for women. For instance, in New Delhi, a woman has   to pay 4% stamp duty compared with 6% for a man; if the property is   bought jointly in the name of a man and a woman, buyers have to pay a   stamp duty of 5%. 
Similarly, in Haryana, a man is required to pay   8% stamp duty in urban areas and 6% in rural areas, while a woman has   to pay 6% in urban areas and 4% in rural areas. 
Increases loan eligibility
Most property purchases are financed through home loans.   When giving out a loan, lending institutions first determine the   eligibility, which primarily depends on the income of the borrower.   Typically, loan eligibility is around five times the annual salary of   the borrower. However, "If the borrower draws insufficient income, has a   low credit score or a low repayment record, a co-borrower's involvement   is a blessing for the loan applicant and the lender is assured of   timely repayment. Financial lenders require all   co-owners of a property to be co-applicants of the home loan. However,   all co-applicants may not necessarily be co-owners
In   case of joint applicants, incomes of all the borrowers are taken into   consideration to determine the loan eligibility and can enhance the loan   amount. For instance, if your yearly income is about ₹10 lakh, you may   get a loan of up to ₹50 lakh. If your spouse also earns ₹10 lakh a year,   both of you can jointly borrow up to ₹1 crore. Besides, "having women   as a co-applicant could also get you concessional interest rate at   several financial institutions. It could either be your mother, sister,   wife or daughter, but they need to be the first home buyers
Gives tax benefits to both
Repayment of home loan can give tax benefits to both joint owners of a house.
Payment of stamp duty and registration fee qualifies for deduction up to ₹1.5 lakh under Section 80C   of the Income Tax Act, 1961. Principal repayment in a year can be   claimed up to the overall limit of ₹1.5 lakh allowed under Section 80C   of the Act. The interest paid on the home loan is allowed for deduction   under Section 24(b) of the Act up to ₹2 lakh a year, in case the home   loan is acquired for a self-occupied house. 
Joint borrowers who   are also joint owners of the property can each claim deduction   separately up to the above mentioned limits, as per their ownership   share. However, jointly they cannot claim more than the actual amount of   home loan repaid.
It is always beneficial when both partners   contribute an equal proportion while buying a property. This will help   them in getting equal taxation and capital gains benefits
There   are other tax benefits as well. In case you plan to rent out the   property, rental income can be shared by both the owners and may attract   tax at a lower rate. For instance, if both the owners earn ₹8 lakh per   annum and the property they jointly own with equal shares is rented out   at ₹4 lakh per annum, ₹2 lakh each will be added to their incomes. In   other words, their total individual income would be ₹10 lakh each, which   comes below the slab of 30%. In the same example, if the property was   owned by only one of them, the total income of that individual would   have become ₹12 lakh, pushing the person in the 30% tax bracket.
Eases succession
In   case the property is jointly owned by both the spouses—as a joint owner   or a joint tenant with equal shares in the property—it may ease up   succession issues. At the legal level, "doing so (joint ownership) also   ensures that the spouse has no problems when it comes to claiming his or   her rights of the property in the case of the demise of the other   spouse
"In   case one of the spouses dies, there will not be much stress and work   involved to get the mutation done in the name of the surviving owner. It   is easy and saves you charges involved for mutation
While   there are many advantages of buying a home jointly with spouse,   remember that problems could arise if your relationship sours.