My brother & I bought a house & on the 1098 form both of our names are on it. i'm the co-borrower, we both pay & only his SS# is on form.who should file using this form.

[DeniseF1]

As long as you are listed on the loan, both of you can deduct the mortgage interest and property taxes.  

Buying a house jointly and not married, please read following and look at the link for more detail.

You can split the amounts paid for things like mortgage interest, property taxes, loan origination fees (points) etc. and each itemize with your split percentage (some people do 50-50, some do 100-0, some do 40-60 - just depends on what you agree on) as long as between the two of you, you do not exceed 100%. 

Note: the first year of purchase you will not have a full year of property taxes and mortgage interest so many times the 2nd year of ownership gives you the greatest benefit. 

To enter mortgage interest

• Click on Federal Taxes (Personal using Home and Business)
• Click on Deductions and Credits 
• Click on I'll choose what I work on (if shown)
• Under Your Home
• On Mortgage Interest, click on the start or update button

Property taxes is right after this area. 

"For jointly owned property, you are entitled to deduct the actual amount of interest or taxes that you paid. If you and your partner contribute equally to the expenses, you can each take 50 percent of the deduction. Often, however, dividing the deductions will result in the highest total tax, because neither partner will have enough to itemize. In many cases it is most advantageous for the person with the highest income to take all the deductions, which will provide the biggest decrease in taxable income. You might find it helpful to prepare your tax returns three times: taking the standard deduction; itemizing using your percentage of the deductions; and itemizing using the full deductions on the tax for the partner with the highest income. Compare the results with those of your partner's -- for example, if you take the standard deduction and include none of the deductions for property, and he itemizes the full amounts allowable on the property -- and determine which scenario results in the lowest net tax in total on the two returns."

 Source: http://budgeting.thenest.com/tax-deductions-related-jointly-owned-property-unmarried-individuals-238...

https://ttlc.intuit.com/questions/3614472-1098-my-name-is-not-on-it-can-i-claim-the-interest-if-i-he...

[22bdebbie]

I co-own a home and we both pay equally (50-50).

Can one right off the property tax and the other right off the interest paid?

OR do you have to split both in half?

[AbrahamT]

It depends how you work out this arrangement. You could either split the mortgage interest and real estate tax 50/50. You can decide to pay the whole real estate tax and your brother pay the mortgage interest. You could work out all the scenarios and see who gets the most advantageous tax benefit between the two of you. In other words, compare the total tax liability between you and him if you were to take the entire real estate taxes and he took the entire mortgage  interest and vice versa. Now, that difference, you may want to split. In either case, however you slice it between the two of you, that full mortgage interest and real estate taxes has to be reported.