Last modified: Tuesday, June 17, 2008 10:38 AM PDT Friday is deadline for Payette County tax payments By Argus Observer staff Payette — Payette County Treasurer Donna D. Peterson has announced the final day for payment on the second half of property taxes for 2007 without penalty and interest is Friday. A post office cancellation is considered the filing date, and any payment received in the Payette County Treasurer’s office after Friday which has the post office cancellation of June 20, will be considered paid on time. A postage meter is not an acceptable post office cancellation mark. All payments received after Friday will be subject to a 2 percent penalty of the unpaid balance plus interest at 1 percent per month going back to January 2007 until paid in full.