Divorced - who gets mortgage interest

[taxgirl]

I have new clients that were divorced 12/2014. Father is HOH, mother filing single, both living in house still. Mortgage is in both names. Typically, for mfs, I would come up with a percentage to allocate based on income. Ex-wife not wanting to cooperate to come up with percentage so neither gets to use the prop tax and mortgage interest??

Would anyone handle this differently?

[Gary2]

I'm assuming, from the way you worded it, that you're only doing the father's return. You deduct whatever it is he paid. If it came out of a joint account, and they didn't have an established agreement about dividing it, then take half.

The ex's return is none of your concern, other than ensuring the dependents aren't double-claimed.

[TAX4US]

I would agree with Gar as stated above. However I ponder 1 question. IF divorced in December why are we still living together? I saw once where IRS said this ain't gonna fly but they convinced auditor this was a short time frame.

[taxgirl]

Their house is for sale and the short term plan is to stay until it sells.