What if, after this informal meeting, I still disagree with the assessment?

If any property owner believes their assessment is incorrect and wishes to apply for an abatement, they shall first appeal to the local assessing officials in writing, within 90 days of the notice of tax bill (RSA 76:16) or by March 1st, whichever occurs first. The assessing office has the necessary form which must be completed in full. It is also available on-line here.