Plagiarism is taken seriously at every UK university. Penalties range from a mark of zero on the assignment to expulsion for repeat or severe cases. But the majority of plagiarism cases that reach academic misconduct panels are not deliberate — they're the result of poor note-taking, sloppy paraphrasing, or a genuine misunderstanding of when a citation is required.
This guide covers all of it: what actually counts as plagiarism, how Turnitin detects it, the types of accidental plagiarism students commit most often, and exactly what to check before you submit.
What counts as plagiarism
How universities detect it
Turnitin is the primary detection tool at most UK universities. It compares submitted work against a database of academic papers, websites, books, and previously submitted student essays — generating a similarity percentage.
A high similarity score doesn't automatically mean plagiarism — direct quotes are expected to match, and common academic phrases will always generate some similarity. What matters is whether the matched text is properly cited.
There's no universal threshold. A well-cited essay with lots of quoted material might legitimately score 25–30%. An essay with mostly original paraphrase should score under 10%. Any match that isn't properly attributed is a problem regardless of the overall percentage.
Accidental plagiarism — the most common types
1. Note-taking contamination
You take notes from a source, copying phrases directly, and later forget which parts are your own words. The fix: always put quotation marks around anything you copy verbatim into your notes, and record the source immediately.
2. Paraphrasing too closely
True paraphrasing means fully understanding an idea and expressing it in your own words. It doesn't mean replacing words with synonyms while keeping the same sentence structure.
Original: "Cultural capital encompasses the social assets — educational qualifications, intellectual interests, and cultural knowledge — that promote social mobility."
Too close: "Cultural capital includes the social assets — educational qualifications, intellectual interests, and cultural knowledge — that facilitate upward mobility."
"Bourdieu's concept of cultural capital refers to the non-financial resources — such as educational credentials, intellectual dispositions, and cultural familiarity — that shape an individual's position in the social hierarchy (Bourdieu, 1986)."
3. Forgetting to cite a paraphrase
Many students know they need to cite direct quotes but forget that paraphrased ideas also require attribution. Any time you are using someone else's idea — even completely in your own words — you need a citation.
How to cite correctly every time
- Cite every idea that isn't yours. If you read it somewhere, cite it — even if you've completely reworded it.
- Use quotation marks for direct quotes. Any text taken verbatim must be in quotation marks AND cited with a page number.
- Cite as you write, not afterwards. Adding citations at the end creates gaps.
- Check your reference list matches your in-text citations. Every source cited in the text must appear in the reference list, and vice versa.
- Don't cite sources you haven't read. Use secondary citations where unavoidable and always note them as such.
Self-plagiarism — the type students forget
Self-plagiarism is submitting your own previously submitted work as new work without disclosure. It's treated as academic misconduct at most UK universities even though the writing is technically original.
If you're legitimately building on prior work, declare it explicitly and check your institution's policy.
What to check before you submit
- Every idea that isn't general knowledge has a citation
- Every direct quote is in quotation marks with author, year, and page number
- Every paraphrase is genuinely in your own words
- Every source in your reference list is cited in the text
- Every in-text citation has a corresponding entry in the reference list
- No text has been reused from a previous submission without declaration
SafeGrade's citation checker handles items 4 and 5 automatically — it validates your in-text citations against your reference list and flags mismatches. Free and unlimited.
before you submit.