Washington County, TN property owners have until Feb. 28 to pay their 2022 tax bills.Payments made after that deadline will be subject to a 1.5% interest fee at the beginning of each month the bill is unpaid. Tax payments made by mail must be postmarked on Feb. 28 or before to avoid an interest penalty.Residents applying for state tax relief must also have their paperwork submitted to the Washington County Trustee’s Office by March 31.