I purchased a home in Mar 2017. I paid the full amt of the property taxes for 2017 in Dec 2017. Do I have to reduce the prop taxes paid by the seller's paid portion?

[LinaJ2018 · Accepted solution]

Yes, you would only allow deducting the prorated amount of the real estate tax due after closing ( March-December) even though your contract didn't require the seller to reimburse you for your share.  

Please read  Who claims what portion of property tax?

[BobinCT]

Yes amount they paid WAS due at closing and, in my opinion, is fully dwedductible