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Notarization converts your document into a public document and carries with it the following benefits.
First, if you will have to present your document in court you will no longer need to prove that the document is authentic and duly executed before the court accepts it as evidence.
Ordinarily, before a document is admitted as evidence in court its validity and due execution should be proven either through witnesses (i.e. the parties to the document) or documentary evidence. Notarization does away with this requirement.
Second, notarization results in a presumption that your document was validly and regularly executed. The signature appearing on the document is presumed to belong to the person whom it pertains to and that it was voluntarily signed.
A person disputing the validity of a notarized document has the burden of proving the same by clear and convincing evidence in court.