Is Self-Citation Ethical in Responsible Metrics?

Is self-citation ethical? Self-citation is ethical when an author cites their own prior work because it is genuinely relevant to a new argument, method, or dataset; it becomes unethical only when the primary motive shifts to inflating citation counts, h-index, or a journal’s impact factor. Neither DORA nor CoARA — the two dominant responsible-metrics frameworks — sets a self-citation rule, leaving this judgement almost entirely to editors, reviewers, and individual conscience.

Self-citation is the practice of an author referencing their own previously published work within a new publication, most commonly to establish methodological continuity, avoid self-plagiarism, or trace the development of a research programme over time.

• What counts as self-citation, and why do researchers do it?
• How much self-citation is considered excessive?
• Why don’t DORA and CoARA address self-citation directly?
• Disclosure norms vs blanket caps: the better governance model
• Answer-first Q&A on self-citation ethics
• Implications for journals, funders, and institutions
• Conclusion: toward transparent, not punitive, norms

What counts as self-citation, and why do researchers do it?

Self-citation occurs whenever an author lists their own prior publication in a new paper’s reference list. It is neither rare nor inherently suspect: most research is cumulative, and a study that builds on a researcher’s earlier method, dataset, or theoretical framework has good reason to cite that earlier work directly.

• Establishing methodological continuity with a previously validated technique or instrument
• Avoiding self-plagiarism by properly attributing earlier text, data, or ideas
• Tracing the trajectory of a multi-paper research programme for the reader
• Providing background the author is best placed to cite because they generated the original finding

The Committee on Publication Ethics (COPE) has noted that failing to cite one’s own directly relevant prior work can itself mislead readers into thinking a study is more novel than it is — so the ethical failure mode runs in both directions, not only toward over-citation.

How much self-citation is considered excessive?

There is no single, universally agreed self-citation rate ceiling. A 2023 analysis published in PMC concluded that a self-citation rate around 20 percent is conservatively tolerable for individual researchers, with rates substantially above that treated as inappropriate — but the same paper stresses that discipline size and publication norms shift what counts as normal.

COPE’s own November 2017 forum discussion, “Self-Citation: Where’s the Line?”, found no consensus figure among editors. Some journals cap the absolute number of self-citations (for example, no more than five), others use a percentage-of-total-references ceiling, and many rely on case-by-case editorial judgement rather than a fixed rule. COPE’s broader position on handling citation manipulation asks journals to set their own thresholds and educate authors, rather than prescribing one number for the whole of scholarly publishing.

A 2025 analysis in the Journal of Academic Ethics (Springer) reinforces the intent-based test over a rate-based one, concluding that “ethical reviewers should avoid unnecessary self-citation” while allowing that citing one’s own work is acceptable “if directly relevant” — the same relevance-over-frequency logic COPE applies.

Why don’t DORA and CoARA address self-citation directly?

The San Francisco Declaration on Research Assessment (DORA, 2012) is aimed squarely at eliminating the use of the journal impact factor as a proxy for individual researcher quality in hiring, funding, and promotion decisions. It says nothing about how many times an author may cite themselves within a paper’s reference list — that is a citation-practice question, not a journal-metric question, and sits outside DORA’s original scope.

The Coalition for Advancing Research Assessment (CoARA), formed in 2022, commits signatory institutions to move away from inappropriate use of quantitative indicators and toward qualitative, narrative-based evaluation. This is the closest thing academia has to a responsible-metrics consensus position, yet CoARA’s Agreement likewise does not name self-citation as a distinct risk category — it addresses metric misuse at the institutional and assessment level, not individual reference-list behaviour.

The result is a genuine governance gap. Self-citation sits between two policy domains — publication ethics (COPE’s territory) and research assessment reform (DORA and CoARA’s territory) — without either treating it as a first-class concern. Editors are left applying inconsistent journal-level rules, while institutional assessment reformers focus almost entirely on how metrics are used rather than on what feeds into them.

Disclosure norms vs blanket caps: the better governance model

A blanket percentage cap on self-citation is easy to state but poorly matched to how research actually varies. Small or emerging subfields with few active authors, first-in-series methodology papers, and long-running research programmes will all show naturally higher self-citation rates than a large, well-established field — penalising a rate rather than the intent behind it risks punishing legitimate continuity while doing little to stop a determined metric-gamer, who can simply keep self-citations just under whatever line is drawn.

A more workable precedent already exists in bibliometrics. The standardized citation-metrics database maintained by Ioannidis, Boyack, and Baas — used to identify the world’s most-cited scientists across disciplines — reports each author’s composite citation score both with and without self-citations included, alongside their raw self-citation percentage. It does not impose a cutoff; it makes the number visible and lets the reader judge. That is a disclosure model, not a cap.

Applying that same logic to individual authors and grant applicants is straightforward: require a disclosed self-citation rate alongside any citation-based metric submitted for hiring, promotion, or funding decisions, rather than an arbitrary cap that cannot distinguish a legitimate methods lineage from deliberate metric inflation.

Answer-first Q&A on self-citation ethics

Is self-citation unethical?

Self-citation is not inherently unethical. It becomes ethically problematic only when it is used to inflate citation metrics rather than to serve genuine scholarly continuity — what COPE treats as a form of citation manipulation. Relevance to the argument, not frequency, is the ethical test that matters.

Is it okay to cite yourself in a research paper?

Yes. Citing your own prior work is standard practice when it establishes methodological continuity, avoids self-plagiarism, or shows how a study builds on earlier findings. Problems arise only when self-citations serve no argumentative purpose beyond raising an author’s h-index or a journal’s impact factor.

Is self-citation illegal?

No. Self-citation is a matter of publication ethics, not law. Excessive or irrelevant self-citation can breach a journal’s editorial policy or COPE’s citation-manipulation guidance, potentially triggering a correction or editorial inquiry, but it carries no legal liability in any jurisdiction.

Implications for journals, funders, and institutions

Journals can adopt the disclosure model directly: require authors to report a manuscript’s self-citation percentage at submission, alongside a one-line rationale where the rate is unusually high, rather than enforcing an arbitrary cap during peer review.

CoARA signatories reforming promotion and funding criteria are well placed to extend their existing move toward narrative CVs by asking applicants to disclose self-citation-adjusted metrics alongside any citation count submitted for assessment — consistent with CoARA’s broader commitment to context over raw indicators.

DORA signatories evaluating individual researchers already commit to judging research on its own merits rather than by journal-level proxies; adding a self-citation disclosure line to that practice would close a gap the original 2012 declaration was never designed to cover.

Conclusion: toward transparent, not punitive, norms

Self-citation is not a solved problem in responsible metrics guidance — it is an unaddressed one. DORA targets journal-level metric misuse; CoARA targets institutional assessment culture; COPE offers editorial case law without a universal rule. None of the three treats individual self-citation disclosure as a named requirement.

The fix does not need a new blanket percentage cap, which would misfire across disciplines of different sizes and publication norms. It needs a disclosure norm: report the self-citation rate, report the rationale where it is high, and let editors, funders, and hiring committees judge intent with that information in hand — the same logic that already underpins the field’s most credible standardized citation databases.