How can I compel a person who sold me a home to pay her portion of property taxes incurred when she owned the home?

You should begin by looking at the real estate contract to determine how the taxes were to be handled. Usually, the seller credits the buyer at closing, meaning the buyer then has the funds to pay the sellers portion of the taxes. Often the credit is final, meaning the seller takes the risk that too much was credited and the buyer takes the risk that not enough was credited. Some contracts provide for recalculation upon issuance of the tax bill. Some contracts deal separately with handling a situation such as yours where the property had not been taxed in the past. Your closing attorney should have considered whether the contract provisions were adequate and protected you at closing to make sure the provisions were implemented. Check your closing statement to see if you received a credit. You should call your closing attorney to review what happened.

If it turns out this was not addressed, you may have a difficult time collecting. Generally, without language to the contrary, the contract becomes irrelevant by virtue of the deed superceding it (the contract merges into the deed). So, if it was overlooked at the time, there may be a problem.

If the amount is worth the cost and your closing attorney is not able or willing to assist you, you should consult another attorney to review all the documents and consult with you about your options.