Does the small estate Affidavit have to be notarized or filed at the court house to be valid?
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The small estate affidavit does not have to be notarized. It does need to be signed "under penalty of perjury."
As far as whether you need to file it at the courthouse, it depends on what you want to use it for. Most of the time, you simply provide it to whatever institution you are dealing with (often a bank).
Neal J. Wallace