Pennsylvania REV-1649 -- Schedule O — Deferral/Election of Spousal Trusts is a form used by Pennsylvania taxpayers to elect deferral of spousal trusts. This form allows for the deferral of Pennsylvania inheritance tax that would otherwise be due on assets transferred to a spousal trust. The form is completed and filed with the Pennsylvania Department of Revenue. There are two types of Pennsylvania REV-1649 -- Schedule O — Deferral/Election of Spousal Trusts: Qualified Terminable Interest Property (TIP) Trusts and Qualified Domestic Trusts (Dots). A TIP Trust allows the surviving spouse to receive income from the trust assets during their lifetime, with the principal being distributed to the beneficiaries upon the surviving spouse’death DODTOTOOT Trust provides for the surviving spouse to receive income from the trust assets for their lifetime, with the principal remaining in the trust until the surviving spouse’s death.