British or American Spelling in IELTS? What’s Accepted and What to Watch

Nandini from Coimbatore wrote “colour” in one paragraph and “color” in the next. Her laptop at work had been set to American English for years.

Both British and American spellings are accepted in IELTS Writing, so choose one system and keep to it. Learn the patterns where they differ, because spelling still counts and, as of October 2026, IDP IELTS India says IELTS on computer has no spell-check.

What Do the Official Sources Say About Spelling?

The IELTS website’s Academic format pages for Writing, Reading and Listening do not mention spelling varieties, so the statements below come from the IELTS partners.

In Writing, IDP IELTS says you can use British or American spelling as long as the words are spelt correctly and you stick to one or the other. It adds that mixing the two is not a spelling error as such, only inconsistent. The British Council says IELTS has no preference and that either variety will not change your score, although consistency is good practice.

In Listening, Cambridge’s IELTS FAQ says both UK and US spellings are accepted, but you lose marks for incorrect spelling.

The British Council also says both varieties are accepted in Reading. Because the passage supplies the words, copy them exactly as printed; Cambridge’s FAQ says spelling mistakes in Reading lose the mark.

Why Consistency Is Still Good Practice

Consistency is advice, not an IELTS rule. One system gives you a single set of patterns to check when you proofread, and your essay reads as one controlled piece of writing.

The Writing descriptors cover spelling under Lexical Resource. Band 6 mentions some errors in spelling that do not impede communication, and Band 7 mentions a few errors that do not detract from overall clarity. Our guide to British, American and Australian English covers wider differences.

Common British and American Spelling Patterns

Cambridge University Press’s English-teaching blog says British English can spell words ending in -ise with -ize, while American English accepts only -ize. So -ize is not “American only”. If you choose British spelling, -ise matches the British Council’s own example, which pairs “favourite” with “organise”.

Check which way your own habits lean. If your laptop is set to American English, watch for -or, -er and -ize creeping into your practice essays; if you learnt British spelling at school, watch for the reverse when you type.

In British English, “licence” is the noun and “license” the verb, and “practice” is the noun and “practise” the verb. American English uses “license” and “practice” for both noun and verb. In both varieties, “advice” is the noun and “advise” the verb, as our post on word forms in IELTS shows for other families.

How to Prepare for Test Day

IDP IELTS says typing slips on the computer test are treated as spelling mistakes, so leave time to proofread. Our list of frequently misspelt English words is a good place to start with topic words.

Key Takeaways

• IDP IELTS and the British Council both accept British and American spelling in Writing.
• Cambridge’s FAQ says UK and US spellings are both accepted in Listening.
• Consistency is good practice, but IDP IELTS calls mixed spelling inconsistent, not an error.
• British English can use both -ise and -ize.