Declining a peer-review invitation is a normal, expected part of the editorial process, not a professional failure. Editors would rather receive a prompt, polite decline than a review that arrives late, is rushed, or comes from someone who was never the right fit for the manuscript in the first place. This guide covers when declining is the right call, how to do it well, and what to say — including a worked example you can adapt.
Legitimate reasons to decline a review invitation
Editors generally recognize the same handful of reasons as valid grounds to decline, and none of them require an elaborate justification:
- Conflict of interest. If you share an institution with an author, have collaborated with them recently, have a personal or financial relationship with them, or have any other interest that could bias your assessment (or reasonably appear to), decline rather than disclose-and-proceed unless the editor specifically asks you to continue with the conflict noted. CASRAI’s Types of Conflict of Interest guide and the Conflict of Interest (COI) in Research dictionary entry cover what counts.
- Insufficient expertise. If the manuscript sits outside what you can competently assess — the wrong subfield, a methodology you don’t work with, statistics beyond what you can evaluate — decline rather than review it superficially. A partial-expertise situation (you can assess some sections but not others) is different: that’s usually workable if you disclose the gap in your report rather than a reason to decline outright.
- Time constraints. If you cannot realistically meet the requested deadline given your current workload, decline rather than accept and deliver late or rushed. Committee on Publication Ethics (COPE) guidance treats declining a review you can’t complete on time as more constructive than accepting and then being late, since a late review holds up the author and the editorial office regardless of your reasons.
- Confidentiality or competing-manuscript concerns. If you’re already reviewing a closely related manuscript elsewhere, or the work overlaps with something you’re actively working on yourself in a way that creates a competing interest, decline or flag it to the editor.
- You’ve identified yourself as a likely author despite anonymization. Under double-anonymized review in particular, if you can identify the author(s) and that creates a conflict or bias risk, say so and decline.
None of these require you to justify yourself at length in the decline message itself — a brief, honest reason (or no reason at all, since most systems don’t require one) is sufficient. See CASRAI’s Peer Reviewer guide for the fuller set of COPE conflict-of-interest categories that apply before you accept any invitation.
Response-time etiquette
Most editorial systems (Editorial Manager, ScholarOne, Open Journal Systems, and others) send an invitation with an explicit response window, commonly somewhere in the range of a few days to about a week, and a soft deadline for the review itself if you accept. Two etiquette points matter more than the exact number of days:
- Respond promptly either way. An unanswered invitation blocks the editor from moving on to another reviewer and can add days or weeks to a manuscript’s time to first decision. Even if you’re not sure yet, most systems allow you to decline immediately and let the editor find someone else, which is almost always better than sitting on the invitation while you decide.
- Don’t accept provisionally and decline later unless something genuinely changes. If you already know you won’t be able to do the review, decline at the outset rather than accepting to “hold the slot” and hoping your schedule opens up. If a conflict or capability gap only becomes clear once you’re reading the manuscript, that’s different — see the section below on declining after you’ve already accepted.
Suggesting an alternative reviewer
Many journals explicitly invite you to suggest a replacement when you decline, and doing so — even when it isn’t asked for — is widely regarded as good editorial citizenship. It saves the editor a search cycle and keeps the manuscript moving. A few practical points:
- Suggest someone genuinely qualified for this specific manuscript, not just any colleague who owes you a favor. A suggestion made for the wrong reasons (reciprocity, padding a colleague’s reviewing record) is the same underlying problem COPE flags in other misattribution contexts.
- Check the suggested reviewer doesn’t share the same conflict you’re declining over. Suggesting a close collaborator of yours, or someone at the same institution as an author, just moves the conflict rather than resolving it.
- You don’t need their advance consent to suggest them — the editor will send its own separate invitation — but a name you have reasonable confidence would actually respond is more useful to the editor than a name pulled at random from a reference list.
- It’s optional, not obligatory. If nobody suitable comes to mind, a plain decline with no suggestion is completely acceptable; don’t manufacture a name just to seem helpful.
How to decline, mechanically
Most declines happen through the journal’s own submission platform rather than a freeform email:
- Portal-based systems (Editorial Manager, ScholarOne, OJS, and similar) usually give you a “Decline” or “Unable to Review” link or button directly in the invitation email or on login, often with an optional free-text reason field and, on some platforms, a field to name an alternative reviewer.
- Direct email invitations, more common at smaller or society-run journals, expect a short reply email. See the worked example below.
Either way, use the mechanism the journal actually gives you rather than ignoring the invitation outright — a non-response looks the same to an editor as a lost email, and most systems will eventually re-send or escalate to another reviewer anyway, at the cost of extra delay.
Worked example: declining a review invitation
The following are illustrative templates, adaptable to your own situation — not a mandatory format. Keep the message short; editors don’t need an extended justification.
Simple decline, no reason given
Subject: Re: Invitation to Review Manuscript [ID]
Dear Dr. [Editor’s name],
Thank you for the invitation to review “[manuscript title].” Unfortunately, I’m unable to take this on at present. I hope you’re able to find a suitable reviewer soon.
Best regards,
[Your name]
Decline for insufficient expertise, with a suggested reviewer
Subject: Re: Invitation to Review Manuscript [ID]
Dear Dr. [Editor’s name],
Thank you for thinking of me for this manuscript. The paper falls outside my area of expertise — my work is in [your field], and this manuscript’s core methodology is in [different field] — so I don’t think I’m the right reviewer to give it a fair assessment. You might consider Dr. [name], whose recent work on [topic] looks closely aligned with this manuscript’s subject matter.
Best regards,
[Your name]
Decline for a conflict of interest
Subject: Re: Invitation to Review Manuscript [ID]
Dear Dr. [Editor’s name],
Thank you for the invitation. I need to decline, as I have a conflict of interest with one of the authors [a recent collaborator/former student/same-institution colleague — only as much detail as you’re comfortable giving] that I don’t think allows me to review this fairly. I’d be glad to review for you again on a future manuscript.
Best regards,
[Your name]
If you realize you should decline after already accepting
Sometimes a conflict or capability gap only becomes apparent once you’re partway through the manuscript — you recognize an author’s identity despite anonymization, the paper turns out to be outside what you can actually assess, or your schedule changes unexpectedly. Tell the editor immediately rather than pushing through or going quiet. Editors would much rather reassign a review early than receive a late, superficial, or compromised one. CASRAI’s How to Conduct a Peer Review guide covers this scenario, and the wider set of reviewer conduct obligations, in more depth.
Common mistakes when declining
- Not responding at all. This is worse for the editor and the author than a prompt decline, since the manuscript sits idle until the system times out or someone follows up.
- Accepting to avoid saying no, then missing the deadline. Editors and authors are both better served by an honest decline up front.
- Over-explaining. A one- or two-sentence reason is plenty; editors don’t need a detailed account of your schedule or personal circumstances.
- Disclosing more about a conflict than necessary. You don’t need to name the exact nature of a personal relationship or financial interest — “a conflict of interest with one of the authors” is normally sufficient detail for the editor to accept the decline without further question.
- Suggesting a reviewer purely as a favor, rather than because they’re genuinely suited to the manuscript.
Common questions
Do I have to give a reason for declining a peer review invitation?
No. Most journal systems make the reason field optional, and a plain decline with no explanation is a normal, accepted response. A brief reason is helpful to the editor when you have one, but it isn’t required.
Will declining hurt my standing with a journal or editor?
Declining occasionally, for a genuine reason, doesn’t damage your standing as a reviewer — editors expect a meaningful share of invitations to be declined and build review timelines around it. What does affect your standing is accepting repeatedly and then delivering late, low-quality, or superficial reviews, or never responding to invitations at all.
Can I decline after I’ve already accepted the invitation?
Yes, if a genuine reason emerges — a conflict you didn’t initially notice, a capability gap once you’re reading the manuscript, or a scheduling conflict that arose after you accepted. Tell the editor as soon as you realize it rather than waiting until the deadline has passed.
Should I always suggest an alternative reviewer when I decline?
It’s good practice when you genuinely know someone well-suited to the manuscript, but it’s optional. Editors don’t expect every decline to come with a replacement name, and a suggestion made just to seem helpful, without real fit, isn’t more useful than no suggestion at all.
How many times can I decline before a journal stops inviting me?
There’s no fixed threshold, and it varies by journal and editor. Declining for genuine reasons (conflicts, expertise mismatch, workload) is treated differently from repeatedly ignoring invitations outright; the latter is more likely to reduce how often an editor comes back to you than an honest decline ever would.
Related CASRAI resources
- Peer Reviewer: Role, Responsibilities, and How to Become One — the fuller COPE conflict-of-interest and conduct framework this page draws on.
- How to Conduct a Peer Review — what to do once you’ve accepted an invitation.
- Reviewer Guidelines: What to Look For, How to Structure Comments, and Common Mistakes — the mechanics of writing the review itself.
- Peer Review: What It Is, How It Works, and Why It Matters — the process-level overview.
- Types of Conflict of Interest and Conflict of Interest (COI) in Research.
- COPE Guidelines Explained — the wider ethical framework reviewer conduct sits within.
- Double-anonymized peer review and single-anonymized peer review.
