A Turnitin score can be high without any plagiarism. The most common causes are a counted reference list, correctly quoted material, an earlier version of your own work stored in Turnitin’s archive, shared templates or assignment questions, and common academic phrases. Read the matches before assuming the worst.
Few things are more stressful than a high score on work you wrote yourself. The similarity score only measures matching text. It cannot tell the difference between copying and correct quoting, or between a classmate’s essay and your own earlier draft. This guide covers seven innocent causes, how to spot each one and what to say to your tutor.
Why is my Turnitin score high if I didn’t copy?
Because Turnitin counts any text that matches its database, not just copied text. References, quotes, standard phrases, template headings and your own previous submissions all match. Each one adds to the percentage unless your tutor’s filters remove it.
What are the seven most common innocent causes?
They are your reference list, quoted material, your own earlier submission, the assignment brief or template, common phrases and terminology, shared group work, and a resubmission after a draft check that was stored. Most can be identified in minutes from the source list.
| Cause | How to spot it | What to do |
|---|---|---|
| Reference list counted | Matches cluster at the end of the document | Ask whether the bibliography filter is on |
| Quoted material | Highlighted text sits inside quotation marks | Fine if cited; ask whether quotes are excluded |
| Your own earlier submission | Source shows ‘student paper’ with a large percentage | Explain it was your draft; ask for that source to be excluded |
| Assignment brief or template | Matches on questions or headings | Tell your tutor; these are expected matches |
| Common phrases and terms | Many tiny matches of a few words | Usually ignored by tutors |
| Group work | Matches with classmates’ papers | Explain the shared sections and follow group rules |
| Stored pre-check | Near 100% match to one student paper | Use only no-repository checks in future |
Are references and quotes counted?
Yes, unless your tutor has turned on the filters to exclude the bibliography and quoted material. With those filters off, a heavily referenced essay can show a much higher score than it really deserves. This is the single most common cause of an inflated score.
Read does Turnitin check references and quotes? for how the filters work and how to format citations so they are recognised.
Can your own earlier submission cause matches?
Yes. If an earlier draft or a previous assignment was saved to Turnitin’s student paper repository, your new submission will match it. This is often called self-plagiarism when it involves reusing old work, but for drafts of the same assignment it is simply an expected match.
If you plan to reuse parts of an earlier assignment, check your university’s rules first: self-plagiarism and Turnitin. If you checked a draft elsewhere and it was stored, that service did not use a no-repository setting.
Do templates and common phrases match?
Yes. Assignment questions, report templates, standard headings and common academic phrases such as ‘the results of this study suggest’ all appear in other documents. They produce lots of small matches that tutors usually recognise and ignore.
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How do you tell which matches matter?
Look for long, continuous matches to a single source that are not in quotation marks and not cited. Those are the matches tutors care about. Many tiny matches, references and quotes, cited passages are rarely a concern. Sort the source list by percentage and start at the top.
Our Turnitin similarity report explained guide shows how to use the match overview step by step.
What should you tell your tutor?
Be specific and calm. Point to the sources driving the score and explain each one: references, quotes, your own earlier draft or template text. Offer drafts or version history if useful. Ask whether filters can be applied, and whether a stored draft can be excluded.
If some matches do need fixing, follow how to lower your Turnitin similarity score honestly before your final submission.
Can translation or shared sources cause matches?
Shared sources can. If several students quote the same textbook or use the same lecture slides, their essays will match those sources and sometimes each other. Translated text is different: Turnitin mainly matches text in the same language, so translated copying may not appear, but tutors can still recognise it.
If your class was given a reading pack or set of key quotes, mention that to your tutor when discussing your report. It explains why many students show the same matches.
How can you stop it from happening next time?
Write from notes rather than open sources, quote and cite as you write rather than at the end, keep your reference list consistently formatted, and only use pre-submission checks that do not store your paper. Save dated drafts so you can always show how your work developed.
- Use a reference manager such as Zotero or Mendeley to keep citations accurate.
- Mark quotes immediately when copying them into notes.
- Keep one master file per assignment with version history switched on.
- Check the final version 24 to 72 hours before the deadline.
Our step-by-step guide, how to check your Turnitin score before submitting, covers safe checking in detail.
When is a high score a real problem?
A high score is a real problem when it comes from long passages copied or closely paraphrased without quotation marks or citations, or from reusing assessed work without permission. If your largest matches look like that, fix them before submitting rather than hoping the tutor will not notice.
Be honest with yourself when reading the report. If a highlighted paragraph came from a source you forgot to cite, add the citation and quotation marks or rewrite it. If you reused part of an old assignment, ask your tutor whether that is allowed. Dealing with it before submission is always easier than explaining it afterwards.
Our guide to types of plagiarism explains which patterns tutors treat most seriously.
Frequently asked questions
Why does Turnitin say my essay matches my own work?
An earlier version of your document, or a previous assignment, is stored in Turnitin’s student paper repository. Your new submission matches it.
Does Turnitin count my bibliography?
It does unless the bibliography filter is turned on. Ask your tutor which filters your module uses.
Why did my score go up when I resubmitted?
Your first submission was probably stored, so the second one matched it. Ask your tutor to exclude that source.
Can a high score be acceptable?
Yes, if the matches are references, quoted and cited material, or expected template text. Tutors judge the matches, not the number.
How can I avoid a stored draft matching my final?
Only use draft checks that do not save your paper to Turnitin’s repository, and confirm this with any service before you upload.
