The majority of trusts that are drafted are known as revocable or living trusts. However, some people write irrevocable trusts as well if the situation dictates the necessity for such. The following are some of the more common irrevocable trusts:
Life Insurance Trust (commonly known as a ILIT)
This type of trust allows a parent to gift the maximum annual exclusion amount, $13,000 in 2012, to their child's trust. The name is derived from the court case which recognized its validity, Crummey v Commissioner (9th Cir 1968) 397 F2d 82. Basically, a parent tells their child that they are gifting their Crummey Trust $13,000 and the child has the right to withdraw said funds within a specified time period if they so desire. Invariably the child will not withdraw the funds whereby the funds become part of the child's trust. If this seems like a big charade to you, then you can think prudently.
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