The first issue for stamp duty was issued in 1917. This consisted of six values ranging from 1d to £1, and was used until it was replaced by the North Australia issue in 1929. This consisted of three values of 1d, 6d and 1s. In 1935, revenues of the Northern Territory were reintroduced in the same design as the 1917 issue but with a different watermark. Stamps in this design continued to be used until 1978 with various changes in currency and design. In 1989 a new set epicting wildlife, with values ranging from 50c to $100, was issued, and it remained in use until 2006.
Only one set of tax instalment stamps was issued, in 1941. It was the keytype used in all Australian states, overprinted N.T. below the value. Twenty nine values ranging from 1d to £2 were issued, and are most commonly found in mint condition.