If you look at the settlement statement from your closing, the seller should have provided you with a credit for their portion of the year's taxes (Jan - Sep). This means when the tax bill comes due you would be responsible for the entire amount since you have already been reimbursed for the taxes by the seller.
Hope this helps.
Timothy Brown | President
Academy Residential Mortgage, Inc.| academyresidential.com
11380 Southbridge Pkwy, Suite 200 | Alpharetta, GA 30022
678.468.5626 x110 | fax 678.935.1156 | cell 678.467.9959