tax return vs tax declaration

[Embargo]

English Language Tests, Intermediate level

ESL/EFL Test #149 "Financial and bank expressions", question 9

I must remember to fill in my tax ......... before the end of this week.

(a) return
(b) declaration
(c) brochure
(d) pamphlet

English Language Tests, Intermediate level

ESL/EFL Test #149 "Financial and bank expressions", answer 9

I must remember to fill in my tax return before the end of this week.

Correct answer: (a) return
_________________________

why not declaration?

Embargo

[Mister Micawber]

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The form (which he must fill in) is called a 'tax return'.
.
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Native English teacher at Mister Micawber's