In the United States, the Internal Revenue Service will still consider income tax returns as filed on time though it receives them late if they are postmarked on time, and this date ( with, perhaps, other proofs of mailing ), may have significance as regards legal filings and proofs of service ( though in this case the date may viewed as " on time " if the date of the postmark is no more than one day after the date service is supposed to have been made ).

In the United States, the Internal Revenue Service distinguishes some schemes as " abusive " and therefore illegal.

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