Pennsylvania REV-1644 -- Schedule L — Remainder Prepayment or Invasion of Trust Corpus is a form used by trustees in the state of Pennsylvania when making a distribution from a trust. It's used to report the trust's remaining assets, the amount distributed, and the method of distribution. There are two types of Pennsylvania REV-1644 -- Schedule L — Remainder Prepayment or Invasion of Trust Corpus: one for a lump-sum distribution, and one for periodic distributions. The lump-sum distribution form is used when the trust's remaining assets are paid out in a single payment. The periodic distributions form is used when the trust's remaining assets are paid out in a series of payments. The form is used to report the trust's remaining assets, the amount distributed, and the method of distribution.