Damaging the surface of the stamp using a serrated or ridged roller.
Multiple parallel cuts.
Handstamp cancels similar to the postmark on a stamp and which may be in purple or red ink rather than the black favoured for cancels of postage stamps.
An Estonian revenue stamp with a handstamp cancel in purple.
A revenue stamp from Cochin cancelled by perforation.
A French revenue stamp with a manuscript cancel.
A revenue stamp of Nepal for court fees with a punched cancel as well as handstamps.
An Indian revenue stamp with a punched cancel.
Values
Postage stamps valid for either fiscal or postal purposes are often worth less when fiscally used than when postally used. They are not, however, necessarily more common fiscally used than postally used.
References
↑Michel (2007) Übersee-Katalog. Band 1/1 Nordamerika 2007/2008. Unterschleissheim Schwaneberger, p. 18.
↑From around 1900, United States revenue stamps were required to be mutilated by cutting, after being affixed to documents, and in addition to being cancelled in ink. A class of office equipment was created to achieve this which became known as "stamp mutilators". Revenue Stamp Mutilators.Archived 2012-06-17 at the Wayback Machine Early Office Museum, 2012. Retrieved 15 June 2012.