Oregon Stipulated Agreement (Income Tax) is an agreement between a taxpayer and the Oregon Department of Revenue that allows taxpayers to settle a tax debt without going through the formal process of assessment and collection. The agreement is used to settle a tax debt for less than the full amount owed. It is a voluntary agreement and does not require a court order. There are two types of Oregon Stipulated Agreement (Income Tax): lump sum and installment. With a lump sum agreement, the taxpayer makes a single payment to satisfy their tax debt in full. With an installment agreement, the taxpayer makes regular payments over a period of time until the tax debt is paid in full.