The USMLE limits how many times you can sit each Step and how closely the attempts can be spaced, and it does not let you retake a Step you have passed. Those rules are short, but they shape every decision after a failed attempt, and they are easy to misremember from forum posts. What follows summarises the rules as the USMLE Bulletin of Information states them as of November 2026. The Bulletin is the authority, so read the current version before you register for any retake.
How many attempts does each Step allow?
Four. According to the Bulletin, an examinee who has attempted a Step four or more times, including incomplete attempts, and has not passed it is ineligible to apply for any Step in the USMLE sequence. That last clause is the important one: reaching the limit on one Step closes the whole sequence, not just that exam.
Attempts at the former Step 2 Clinical Skills examination also count toward the limit, which matters for examinees who sat it before it was discontinued.
Does an incomplete attempt count?
Yes. An attempt you start and do not finish counts in the same way as one you complete. That makes the exam-day decision to walk out of the test centre partway through more costly than it might appear, because it uses one of your attempts without giving you a result to learn from.
If something genuinely prevents you from completing the exam, such as illness or a problem at the test centre, contact the USMLE and the testing provider promptly and keep records. How a particular incident is treated is decided case by case.
How soon can I sit a Step again?
There are two spacing rules in the Bulletin as of November 2026.
No more than three attempts within 12 months. You may not take the same Step more than three times in any 12-month period.
A fourth attempt has its own minimum gap. It must be at least 12 months after your first attempt at that Step, and at least six months after your most recent attempt. Incomplete attempts count for both rules.
These are minimums, not recommendations. Very few people who fail benefit from sitting again at the earliest permitted moment, because the gap is the time in which the preparation actually changes.
Can I retake a Step I have already passed?
Generally not. The Bulletin says that if you pass a Step, you are not allowed to retake it. The exception is a retake needed to comply with a time limit set by a US medical licensing authority, or another authority the USMLE programme recognises, for completing the sequence.
In practice, this means a low passing score on Step 2 CK or Step 3 is permanent. There is no option to sit again to replace it, which is one reason to sit each Step only when practice assessments show you are ready with margin.
Does a failure stay on my record?
Yes. A failed attempt appears on your USMLE transcript alongside the eventual pass. Programmes that review your transcript will see both, which is why a well-prepared retake followed by a strong result on the next Step reads far better than a series of attempts in quick succession.
What should I check before booking a retake?
Three things, all in the current Bulletin and your registration account.
Your attempt count. Confirm how many attempts are on record for that Step, including any incomplete ones.
The earliest permitted date. Work out the spacing rules for your situation before you choose an eligibility period, so the date you want is actually available to you.
Who you register with. Registration routes have changed recently, and the organisation that handled your first attempt may not be the one that handles your retake. Check before you apply.
How should the limits change the way I plan?
The attempt limit is a reason to treat each attempt as scarce. That does not mean delaying indefinitely. It means setting the retake date by evidence: practice assessments taken under real conditions that show you are clearly above the passing standard, not just near it.
It also means looking after yourself between attempts. A failure is a hard thing to absorb, and the weeks after it are a poor time to make big decisions alone. Talk to your school, a mentor or an adviser who has helped others through a retake, and reach out to someone you trust if the result is weighing on you more than you can manage.
Where is the official wording?
In the USMLE Bulletin of Information, in the sections on eligibility and on limits to exam attempts. The Bulletin is updated periodically, and the rules here have changed in the past, so treat any summary, including this one, as a starting point and the Bulletin as the final word.
Frequently asked questions
How many times can you fail a USMLE Step?
As of November 2026, the USMLE Bulletin sets a limit of four attempts per Step, and incomplete attempts count. An examinee who has attempted a Step four or more times without passing is not eligible to apply for any Step. Check the current Bulletin before planning around this, because policies change.
How soon can I retake a failed Step?
The rules limit you to three attempts at the same Step within any 12-month period, and a fourth attempt has its own spacing rule. Within those limits, the right date is the one your practice assessments say you are ready for, not the earliest one available.
Can I retake a Step I passed to improve my score?
No. A passed Step generally cannot be retaken, so a passing score stands whatever the number. The only exception the USMLE describes is a retake required to meet a time limit set by a licensing authority or another recognised authority.