Tax codes used on UK records. Note that this list is not yet entirely complete for Decca related labels, which in some cases differed from EMI-related ones. It is, as far as I am aware, complete for EMI-labels (HMV, Columbia, Odeon, Parlophone, etc).

1940-10-21 T Purchase Tax introduced 33.3% ("No Tax" stamps applied to stock already purchased.)
1942-01-01 - Price increase
1942-04-15 DT Purchase Tax increase 66.6% (on E.M.I. records, the D is added above the T.)
1943-04-13 TT Purchase Tax increase 100%
1946-04-10 ST Purchase Tax reduction 33.3%
1947-11-13 LT Purchase Tax increase 50%
1948-04-09 DT(48) Purchase Tax increase 66.6% CT on Decca
1950-12-30 DTP Price increase CT+IP on Decca (AT stamps)
1953-04-15 N Purchase Tax reduction 50% (NT on stamps)
1955-10-27 RT Purchase Tax increase 60%
1955-10-31 - Price increase
1956-08-27 - Price reduction (45 r.p.m. singles)
1957-06-01 XT Price increase (not on Decca)
1958-10-01 - Price reduction (on E.P.s - 7ER series only) (UT stamps)
1959-04-08 ET Purchase Tax reduction 50%
1960-08-01 WT Price changes on some series
1961-07-26 OT Purchase Tax increase 55% and price changes
1962-04-10 ZT Purchase Tax reduction 45% and price changes
1962-11-26 PT Price changes on some series
1963-01-01 MT Purchase Tax reduction 25%
1963-07-01 KT Price changes
1966-07-21 - Purchase Tax increase 27.5%
1968-03-20 - Purchase Tax increase 50%
1968-11-23 JT Purchase Tax increase 55%
1971-07-20 - Purchase Tax reduction 45%
1972-03-21 - Purchase Tax reduction 25%
1973-04-02 - Purchase Tax replaced by V.A.T.
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