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Canadian phosphor tagging has been classified into Tag Types. Tagging errors, the result of either shifts of the tagging, shifts of the perforations (or die cutting on self-adhesive stamps), or the lack of tagging, result in sub types of these major classifications:
 

Winnipeg tagging

W1: one tag bar down the middle of the stamp. click for images of W1 errors W2: tag bars down the vertical perforations with the result being two half-tag bars on a stamp. click for images of W2 errors W3: six tag across the pane of ten stamps, on alternate columns, including the left and right selvedge. click for images of W3 errors W4: five tag bars across the pane of ten stamps, on alternate columns, ignoring the left and right selvedge. click for images of W4 errors W5: pale tag wash over entire stamp.

General tagging

G1: pale tag wash over entire stamp. G2: tag bars down the vertical perforations with the result being two half-tag bars on a stamp. click for images of G2 errors G3: tag bars down the vertical perforations and a tag bar down the middle of a stamp. The result is three vertical bars per stamp. click for images of G3 errors G4: tag bars on all four sides of a stamp. click for images of G4 errors click for images of G4b errors click for images of G4f errors click for images of G4g errors G5: two thin, short tag bars applied inside the stamp. click for images of G5 errors