There is no sector-wide UK dataset of PhD viva outcomes. No body publishes a national breakdown of how many candidates pass outright, receive minor or major corrections, are referred, or fail — and any figure presented as “the UK PhD pass rate” is not drawn from one.
That is an unsatisfying headline, so it is worth being precise about how it was established and what can be evidenced instead — because a great deal can.
Why no national pass rate exists
The organisations that would hold such data do not collect it.
HESA, now part of Jisc, collects student and qualification records but no examination-outcome field for research degrees. The UK Performance Indicators that once carried research-degree measures were discontinued after 2020/21, and the research-output indicator was last released in 2014 for the 2012/13 year.
The UK Council for Graduate Education publishes postgraduate sector data covering enrolments, not outcomes. The QAA sets out what the doctoral examination involves without publishing frequencies. And individual universities publish their research degree regulations — which list the outcomes available — rather than statistics on how often each is used.
A caution about the figure you may have seen. A pass rate of roughly 96% circulates widely. It traces to a commercial website reporting freedom-of-information requests to 14 UK universities covering 2006 to 2017. That is not peer-reviewed, not sector-wide, drawn from a small and self-selected group of institutions, and in part up to two decades old — and the source itself concedes that institutions did not all supply comparable corrections data. It should not be cited as a UK pass rate, and we are not citing it as one here.
What is actually evidenced: the outcomes available to examiners
The best available UK evidence comes from Stan Taylor’s study Developments in the Doctoral Examination in the UK, published by the UK Council for Graduate Education in August 2022. It examined the published documentation of UK degree-awarding institutions; documentation was publicly available for 127 institutions, 98% of those with their own research degree awarding powers (access was restricted to internal staff at four others).
Read the table below for what it is: a census of what examiners may recommend, not how often they do.
| Outcome available to examiners | Institutions | Share of 127 |
|---|---|---|
| Outright pass, no further changes | 127 | 100% |
| Pass subject to minor corrections | 121 | 95% |
| Pass subject to major corrections | 80 | 66% |
| Corrections with no minor/major distinction | 6 | 5% |
| Pass subject to a satisfactory viva or further test | 34 | 28% |
| Refer and resubmit | 124 | 98% |
| Award of a lower degree | 127 | 100% |
| No degree awarded, no resubmission | 127 | 100% |
| Published procedure where examiners disagree | 92 | 75% |
Source: Taylor, S. (2022), Developments in the Doctoral Examination in the UK, UK Council for Graduate Education.
Two readings are worth drawing out. Every single institution retains both the best outcome and the worst — an outright pass and no award — which is why no one can promise you the viva is a formality. And a third of institutions do not offer a “major corrections” category at all, which means the same body of work could be classified differently at two universities. When someone tells you they got major corrections, that label is institution-relative.
How long you get to make corrections
The same study recorded the time limits attached to each outcome. These are the most practically useful figures in this article, because they tell you what to plan for.
| Outcome | Time allowed | Institutions |
|---|---|---|
| Minor corrections (of the 121 offering it) | One to two months | 24 (20%) |
| Up to three months | 79 (66%) | |
| More than three months | 11 (9%) | |
| Major corrections (of the 80 offering it) | Six months | 64 (80%) |
| More than six months | 11 (14%) | |
| Refer and resubmit (of the 124 offering it) | Up to 12 months | 97 (78%) |
| Up to 18 months | 18 (15%) | |
| 24 months | 4 (3%) |
This aligns closely with the QAA’s account, which notes that providers define these terms differently, particularly in the length of time candidates are given, but that three to six months for minor changes and six to twelve months for major changes are not uncommon.
Two operational details from the same study. Minor corrections were in most cases signed off by the internal examiner alone, with no further viva. Major corrections were normally signed off by both examiners, again without a further viva. For resubmissions, a second viva was mandatory at 12 institutions (10%) and at the examiners’ discretion at 89 (72%).
What the QAA says about failure
On the question candidates actually worry about, the QAA is reassuring without being specific: the oral examination is a difficult experience for some and may lead to a recommendation that the candidate should not be awarded a doctoral degree, but only a minority of candidates fail the doctoral assessment outright.
It adds that in most providers, examiners have the option of awarding a different qualification such as an MPhil where that is more appropriate to the candidate’s achievements — which the UKCGE data confirms is available at all 127 institutions. Note that this is a different decision from being registered for MPhil before an upgrade, a distinction covered in our guide to the MPhil to PhD upgrade.
Two further points from the QAA that shape expectations usefully. Corrections leave no trace: once amendments are made, there is no indication in the award certification of the corrections the examiners required, and the UK doctorate is not graded or classified in any way — it is pass or fail only. And on the day itself, in the UK examiners do not normally reveal the outcome to the candidate in advance of the oral examination, because one of its purposes is to check both the authorship of the thesis and the candidate’s engagement with the research process.
What this means for you
Expect corrections. They are available at nearly every institution and are the ordinary result of doctoral examination, not a mark against you. Planning as though an outright pass is the default sets you up to read a normal outcome as a failure.
Find your own institution’s outcome list. Because a third of institutions have no major-corrections category and time limits vary substantially, only your own research degree regulations tell you what can happen and how long you will have. Read them before your viva, not after.
Budget for the correction period. If your funding, visa or employment plans assume submission is the end, check the timescales above. Three months of minor corrections is the single most common allowance, and it is not optional time.
Do not benchmark yourself against a pass rate. There is not one. What determines your outcome is whether the thesis demonstrates an original contribution and whether you can defend it — the standard examined in our guide to what counts as an original contribution to knowledge, and argued most directly in your discussion chapter.
If corrections have landed and turning examiner comments into revised chapters is the task in front of you, you can work through them in Tesify from your own thesis and your own responses — 100% written by you.
Frequently asked questions
What percentage of PhD students pass their viva?
No reliable UK-wide figure exists, because no body collects examination outcomes nationally. The QAA states only that a minority of candidates fail the doctoral assessment outright. Figures circulating online derive from small freedom-of-information samples rather than national data.
Can you fail a PhD viva?
Yes. All 127 institutions in the UKCGE study retained the outcome of no degree awarded with no opportunity to resubmit, and all retained the option of awarding a lower degree. It is not the common outcome, but it is a real one.
What is the difference between minor and major corrections?
Broadly, minor corrections address typographical errors and small changes to text or tables, while major corrections involve more substantive changes to the thesis. The definitions are institution-specific, and 6 of the 127 institutions surveyed made no distinction at all — so your own regulations are the only authority.
How long do minor corrections take?
Two-thirds of institutions offering minor corrections allow up to three months, a fifth allow one to two months, and around one in ten allow longer. Check your regulations for your own limit.
Will I have a second viva after corrections?
Usually not for corrections — minor corrections are typically signed off by the internal examiner and major corrections by both examiners, without a further oral. For a resubmission, a second viva was mandatory at 10% of institutions and at the examiners’ discretion at 72%.
Do corrections appear on my certificate?
No. The QAA states that once amendments are made there is no indication in the award certification of the corrections required, and that the UK doctorate is pass or fail only with no grading or classification.
Will the examiners tell me the outcome before the viva?
Not normally in the UK. The QAA notes that examiners do not usually reveal the outcome in advance, since part of the viva’s purpose is to verify authorship and your engagement with the research.
What happens if my examiners disagree?
Three-quarters of institutions in the study had a published procedure for examiner disagreement, typically involving an additional independent examiner or a referral to a higher committee. If this concerns you, the procedure will be set out in your institution’s research degree regulations.
Is “refer and resubmit” a failure?
No. It is a judgement that the thesis is not yet at the required standard but is capable of reaching it. It was available at 124 of the 127 institutions, with 78% allowing up to twelve months to revise. It extends the process; it does not end it.