What the government must prove under § 2250(a)
Section 2250(a) of Title 18 punishes whoever meets all three of these conditions: the person is required to register under the Sex Offender Registration and Notification Act (SORNA); the person either is a sex offender by reason of a conviction under federal law, District of Columbia law, tribal law, or territorial law, or else the person "travels in interstate or foreign commerce, or enters or leaves, or resides in, Indian country"; and the person "knowingly fails to register or update a registration as required by the Sex Offender Registration and Notification Act". A violation carries the penalty that the person "shall be fined under this title or imprisoned not more than 10 years, or both".
The Fifth Circuit's model jury instructions frame this as three elements the jury must find beyond a reasonable doubt: the duty to register, the travel, and the knowing failure. They add that "These three elements must be proven to have occurred in sequence." That sequencing matters. For a person whose underlying conviction is under state law, the middle element does the work of making the case federal. The Department of Justice puts the same point in plain terms: state-convicted offenders may be prosecuted under the statute if they knowingly fail to register or update and they engage in interstate or foreign travel or enter, leave, or reside on an Indian reservation.
Knowledge is also narrower than many people fear and broader than many hope. The pattern instructions require proof that the defendant knew registration or updating was required and intentionally did not do it, but add that "the government does not have to prove that the defendant knew he [she] was violating federal law". So a claim of never having heard of SORNA is tested against what the person was actually told at sentencing, at release, and at each registration office visit. Paperwork from those contacts often becomes the core of the trial.
A second, newer provision covers international travel. Under section 2250(b), a person required to register who knowingly fails to provide the information SORNA requires about intended travel in foreign commerce, and who engages or attempts to engage in that travel, faces the same penalty of a fine, up to 10 years in prison, or both. This provision sits within the broader federal sex crimes framework, but it is its own charge with its own elements, and it should not be confused with the failure-to-register charge under subsection (a).
The registration duties under 34 U.S.C. § 20913 behind the charge
A section 2250 prosecution stands on SORNA duties set out at 34 U.S.C. section 20913. The basic rule is short: "A sex offender shall register, and keep the registration current, in each jurisdiction where the offender resides, where the offender is an employee, and where the offender is a student." Initial registration must happen before the person completes the prison sentence for the underlying offense, or within 3 business days after sentencing if there is no prison term.
Keeping the registration current has a strict procedure. The law says a sex offender shall, "not later than 3 business days after each change of name, residence, employment, or student status, appear in person in at least 1 jurisdiction involved pursuant to subsection (a)" and report every change in the required information. Two details trap people here. First, the deadline is 3 business days, not weeks or months. Second, the update must be in person. A phone call, a letter, or an online form that the jurisdiction did not authorize does not satisfy the statute.
SORNA also reaches backward. People convicted before SORNA was enacted, who could not comply with the initial-registration timing because their cases long predated it, fall under a separate provision giving the Attorney General authority to specify how the requirements apply to them and to write registration rules for them. The Supreme Court addressed that arrangement in Gundy v. United States, where it affirmed the conviction and rejected the claim that Congress had unconstitutionally handed legislative power to the Attorney General when it authorized him to "specify the applicability" of the registration requirements to pre-enactment offenders. The practical result is that an old conviction does not by itself answer the question. The tier classification and the current registration footprint still have to be checked.
The tier system, defined at 34 U.S.C. section 20911, sorts offenders by the seriousness of the underlying offense. A Tier I offender is essentially anyone who is neither Tier II nor Tier III. Tier II covers offenses punishable by more than a year that are comparable to offenses such as sex trafficking, coercion and enticement, or transportation with intent to engage in criminal sexual activity when committed against a minor. Tier III covers offenses punishable by more than a year that are comparable to aggravated sexual abuse or sexual abuse as described in federal law, abusive sexual contact against a child under 13, kidnapping of a minor by a non-parent, or an offense committed after the person already became a Tier II offender. The tier sets how long the duty lasts, and as the next sections explain, it also sets the starting point of the guideline range. Related offenses against minors, such as sex trafficking and enticement of a minor, carry their own charges and guidelines and should not be confused with a registration case.
Penalties
For the basic charge under subsection (a) and the international-travel charge under subsection (b), the statute provides that the person "shall be fined under this title, imprisoned not more than 10 years, or both". There is no mandatory minimum for the basic charge. The 10-year figure is a ceiling, not a forecast.
Subsection (d) is far more severe. A person described in subsection (a) or (b) who commits a crime of violence under federal, District of Columbia, tribal, or territorial law "shall be imprisoned for not less than 5 years and not more than 30 years". That sentence is "in addition and consecutive to the punishment provided for the violation described in subsection (a) or (b)", meaning it stacks on top of the failure-to-register sentence rather than running at the same time. The Department of Justice summarizes this the same way, noting that a person who fails to register and commits a violent federal crime may face up to 30 years under the statute.
Prison is not the end of the punishment. Under 18 U.S.C. section 3583(k), the authorized term of supervised release for a section 2250 offense "is any term of years not less than 5, or life". In ordinary words, a judge imposing prison time must also impose at least 5 years of supervised release, and may impose supervision for life, with registration conditions and travel restrictions that can shape where the person lives and works for years.
Read these numbers as maximums and ranges, not predictions. A 10-year maximum says what the law allows at the top. It does not say what any particular person will receive. The facts of a case change everything: the tier, the criminal history, whether anything else is alleged, and how the judge weighs the statutory sentencing factors.
How the sentencing guidelines treat this charge
The Statutory Index in the Guidelines Manual sends violations of section 2250(a) and (b) to guideline section 2A3.5 and violations of section 2250(d) to section 2A3.6. The governing Manual is the November 1, 2025 edition.
Section 2A3.5 starts from the tier. The base offense level is the greatest of: "16, if the defendant was required to register as a Tier III offender"; 14 for a Tier II offender; or 12 for a Tier I offender. The tier therefore moves the starting point by up to 4 levels before anything else is considered, which is why confirming or contesting the tier classification is one of the first jobs in any such case. The federal sentencing process then applies any adjustments and the criminal history score to reach a range.
The specific offense characteristics can move the level sharply. If, "while in a failure to register status", the defendant committed a sex offense against someone other than a minor, or a felony offense against a minor not otherwise covered, the increase is 6 levels. If the defendant committed "a sex offense against a minor, increase by 8 levels". The guideline defines the window precisely: a defendant is in a "failure to register status" during the period in which the defendant engaged in conduct described in section 2250(a) or (b). For these purposes, sex offense takes its meaning from 34 U.S.C. section 20911, and the tier terms take their meanings from the same section.
There is one way down. If the defendant voluntarily corrected the failure to register, or attempted to register but was stopped by uncontrollable circumstances without contributing to them, the level drops by 3. But the reduction has two strict limits. It must have happened before the defendant knew or reasonably should have known that a jurisdiction had detected the failure. And the guideline states plainly: "Do not apply subsection (b)(2) if subsection (b)(1) also applies." Once an additional offense triggers the increases above, the credit for fixing the registration is gone.
Convictions under the crime-of-violence provision are handled differently. Under section 2A3.6, if the defendant was convicted under section 2250(d), "the guideline sentence is the minimum term" required by statute, which the commentary identifies as 5 years against a 30-year maximum, imposed consecutively. Chapters Three and Four adjustments "shall not apply to any count of conviction covered by this guideline", because the sentence is driven by the statute itself.
Two structural cautions belong here. First, the enhancements in this area stack steeply: a Tier III starting point of 16 plus an 8-level increase reaches 24 before criminal history enters the picture, so a calculated range can press against or pass the 10-year statutory ceiling, at which point the statute caps the sentence. Sentencing in neighboring sex-offense guidelines shows the same pattern more strongly, with ranges that routinely exceed statutory maximums and with courts varying below the range at unusually high rates. Any discussion of a likely sentence in this area must reflect both directions at once, and no number on this page predicts any result. Second, the Fifth Circuit's pattern instructions treat tier classification as a question of law for the court, and they note convictions vacated where the prior offense was placed in the wrong tier. Getting the tier right is not paperwork. It can decide the case.
Defenses that arise under this statute
Every defense depends on the facts, the documents, and the controlling law in the district where the case is charged. The recurring lines of defense in section 2250 cases include the following.
Knowledge. The government must prove the failure was knowing. Registration forms signed at release, acknowledgments given at sentencing, and records of past successful registrations all cut toward knowledge, while missing or defective notices, language barriers, or documented confusion cut the other way. The standard is knowledge of the duty plus an intentional failure, not knowledge that federal law was being broken.
The sequence and the federal hook. The three elements must line up in order: duty, then travel or other federal hook, then knowing failure. Where the underlying conviction is under state law and the person never traveled in interstate or foreign commerce and never entered, left, or resided in Indian country, the federal charge has a hole at the second element. Travel records, border crossings, housing records, and employment records are therefore as important as registration records.
Uncontrollable circumstances. The statute provides an affirmative defense with three conjunctive conditions: "uncontrollable circumstances prevented the individual from complying"; the individual did not contribute to creating those circumstances "in reckless disregard of the requirement to comply"; and "the individual complied as soon as such circumstances ceased to exist". All three must be met. Hospitalization, natural disaster, or detention elsewhere may fit the first condition, but the defense still requires proof that the person did nothing reckless to create the situation and that registration followed promptly once it became possible.
Impossibility. Related to the statutory defense, the Fifth Circuit's pattern instructions note that a defendant may argue it was impossible to register in the state of residence because the state lacks proper procedures or will not allow that offender to register. Homelessness, repeated relocations, and conflicting instructions from different jurisdictions feed into this argument. It is narrow, and it needs contemporaneous proof such as office visit logs, rejected forms, and names and dates.
Tier challenges. Because the tier sets both the registration duration and the guideline starting point, an incorrect tier poisons everything downstream. Tier classification turns on comparing the prior offense to the federal benchmarks in section 20911, and the pattern instructions assign that comparison to the judge as a matter of law. Defense review of the tier should happen before any negotiation, since a lower correct tier changes the guideline math and sometimes the viability of the charge period itself.
Pre-enactment convictions. For convictions predating SORNA, the defense must trace the Attorney General's rules specifying applicability and test whether each element of the duty attached to this person at the time charged. Gundy closed the broad constitutional attack on that structure, but it did not remove the need to prove every element as of the dates alleged.
Voluntary correction. Where no additional offense is alleged, prompt voluntary correction before detection can earn the 3-level guideline reduction. The timing bar is strict: correction after the person knew or should have known the failure was detected does not qualify. Anyone considering self-correction should get legal advice first, because the act of registering creates records and admissions that investigators will read.
The closest neighbor: the state registration charge
The offense most often confused with section 2250 is the state-law failure-to-register charge. SORNA itself requires every state to punish noncompliance with a criminal penalty carrying more than a year at the top, so each state has its own version of this crime with its own deadlines, forms, and penalties. The federal charge is layered on top of that system, not a replacement for it.
The practical difference is the federal hook. A state case asks whether the person broke that state's registration law. A federal case asks whether the three federal elements line up: a SORNA duty, travel or another federal jurisdictional basis, and a knowing failure. The Fifth Circuit's pattern instructions state that "SORNA's registration requirements are independent of any duty that the defendant has to register under state law", which means compliance with one system does not automatically satisfy the other, and a violation can draw the attention of both systems at once.
This distinction shapes strategy from the first meeting. Counsel must identify which system alleges what, on which dates, and under which tier, because the answers can differ between the state file and the federal file. Consequences litigated in one forum, including custody status and supervision conditions, can affect exposure in the other.
If you are under investigation or have been charged
Do not try to fix a registration problem by traveling to another jurisdiction without advice, since travel itself can supply the federal element the government otherwise lacks. Gather every registration document, release paper, and notice you were ever given, along with any proof of attempts to register such as receipts, rejected forms, and dates of office visits. Write down the timeline of where you lived, worked, and studied, because the duties attach to each of those places. If agents or officers seek an interview, you have the right to speak with a lawyer first, and anything you say about travel or registration can be used to prove knowledge and sequence.
A federal case moves through indictment, detention decisions, and sentencing under rules explained in the federal sentencing overview. After conviction and sentencing, post-conviction options are narrow and deadline driven, including motions under 28 U.S.C. section 2255. Early attention to the tier, the timeline, and the paper trail gives every later stage more room to work.