Duty vs Tax

When to use each in English, with meaning, register, and examples.

Duty

Top 1,000 (very common) B1 noun

Tax

Top 1,000 (very common) B1 noun

	Duty	Tax
Pronunciation	🇬🇧 /["/ˈdjuːti/"]/ 🇺🇸 /["/ˈduːti/"]/	🇬🇧 /["/tæks/"]/ 🇺🇸 /["/tæks/"]/
Meaning	A responsibility or job that someone must do.	Money that people pay to the government.
Example	He felt it was his duty to help the less fortunate.	Everyone has to pay tax on their income each year.
Register	Neutral	Neutral
How common	Top 1,000 (very common)	Top 1,000 (very common)
CEFR level	B1	B1
Part of speech	noun	noun
Collocations	contractual, legal, statutory, have, owe, carry out, call, under a/​the duty, duty of, duty to, a breach of duty, do your duty by somebody, be duty bound to do something, light, onerous, day, have, pull, see, fall to somebody, manager, officer, doctor, off duty, on duty, the execution of your duties, the performance of your duties, light, onerous, day, have, pull, see, fall to somebody, manager, officer, doctor, off duty, on duty, the execution of your duties, the performance of your duties, heavy, high, low, amount, impose, slap on somebody/​something, increase, be payable, in duty, duty on	high, low, direct, pay, owe, charge, go up, increase, rise, payer, preparer, authority/​authorities, after tax, before tax, in tax, for tax purposes, the rate of tax, inspector of taxes
Antonyms	irresponsibility, neglect	subsidy, exemption
Common mistakes	Confused with 'dutie', incorrect spelling., Using 'duty' with a subject instead of a verb; 'duty to help' not 'duty help'., Not using it with the correct preposition, often omitting 'to'.	Confused with 'tack', say 'tack' instead of 'tax'., Using 'taxes' as singular instead of plural., Forgetting to include a specific type of tax, like 'income tax' when needed.
Usage notes	Used in both formal and informal contexts. Often relates to moral or legal responsibilities. Avoid using it in casual conversations where lighter terms like 'task' may fit better.	Use 'tax' in contexts related to finance and government. It's appropriate in discussions about income, sales, or property, but might sound out of place in casual conversations unrelated to finances.

See it in real clips

when he'd done his duty, he went home to your great-grandmother,

Band Of Brothers › S1 E1

Picked six men and gave them latrine duty.

House Of Dragons › S1 E1

It is the duty of this council

when he'd done his duty, he went home to your great-grandmother,

Band Of Brothers › S1 E1

Picked six men and gave them latrine duty.

Duty

Frequently asked questions: Duty vs Tax

What's the difference between Duty and Tax?

Duty: A responsibility or job that someone must do. Tax: Money that people pay to the government.

Are Duty and Tax the same CEFR level?

Duty: B1, Tax: B1 on the CEFR scale.

What part of speech are Duty and Tax?

Duty: noun, Tax: noun.

Can you show an example of each?

Duty: He felt it was his duty to help the less fortunate. Tax: Everyone has to pay tax on their income each year.

Can I use Duty and Tax interchangeably?

Not always. Duty and Tax are related and overlap in some contexts, but they differ in register, how common they are, and usage, so swapping one for another can change the meaning or tone. Check the differences above before substituting.