Tax Season Ending, April 16 The deadline to file state and federal personal income tax returns—April 17—is just a few days away, and the Oregon Department of Revenue estimates that it will receive a few hundred thousand more returns between now and then. More than 1.4 million Oregonians have already filed their state personal income tax returns. The department is expecting 2.2 million returns this year, said Ken Ross, manager of Personal Tax and Compliance Division’s Program Services Section. Of those 1.4 million taxpayers, more than 961,000 have received refunds, with other refunds still in the queue. While most returns are processed without issue, there are two key reasons why a refund may take longer to arrive than the taxpayer expects.