Crimes of omission are offenses you commit by failing to do something the law required you to do. The clearest examples run across everyday life: not reporting suspected child or elder abuse when your job requires it, leaving the scene of an accident, ignoring a child support order, never filing a tax return, failing to register as a sex offender or with Selective Service, and actively concealing a federal felony. Each one shares a single feature — the law had already told you to act, and you didn’t.
Why Doing Nothing Can Be a Crime
American law generally does not punish people for standing by. You can walk past a stranger in distress in most states and face no legal consequence at all. Criminal liability for an omission attaches only when you had a specific legal duty to act. Those duties come from a short list of sources: a statute that names you (like a mandatory reporting law), a special relationship (parent to child, for example), a contract (a hired caregiver), or a situation where you voluntarily took charge of someone’s welfare and then abandoned them.
Every example below fits one of those categories. The pattern is the same each time: the law designated you as the person who was supposed to act, the triggering circumstances existed, and you did nothing.
Failing to Report Child Abuse
Federal law requires every state to run a mandatory reporting system for child abuse and neglect as a condition of receiving federal child-protection funds.1Office of the Law Revision Counsel. 42 USC 5106a – Grants to States for Child Abuse or Neglect Prevention and Treatment Programs State details vary, but the framework is consistent. Certain professionals who work closely with children — teachers, doctors, nurses, social workers, childcare providers, and law enforcement officers — must report known or suspected abuse or neglect to the appropriate child-protection agency.
Timelines are tight. Most states require an immediate phone call, followed by a written report within 24 to 72 hours. Penalties for mandated reporters who fail to report range from misdemeanors carrying fines and jail time up to felonies for repeated or egregious failures. Every state provides good-faith immunity for reporters, so a suspicion that turns out to be wrong carries essentially no legal risk.2Administration for Children and Families. Report to Congress on Immunity From Prosecution for Professional Consultation in Suspected and Known Instances of Child Abuse and Neglect Staying silent when abuse is actually happening does.
Failing to Report Elder Abuse
Protections for older adults follow a similar model. Most states designate healthcare workers, long-term-care employees, and social services staff as mandated reporters who must notify adult protective services when they suspect abuse, neglect, or financial exploitation of an elderly or vulnerable adult.3U.S. Department of Justice. Elder Justice Initiative – Victims’ Rights and Reporting Obligations Some states extend the duty to all adults, not just professionals.
Deadlines and penalties vary, but the structure mirrors child-abuse reporting: a prompt initial call, a written follow-up within a set number of days, and misdemeanor penalties for professionals who knowingly ignore the duty. Good-faith immunity typically applies here as well.
Leaving the Scene of an Accident
Every state requires drivers involved in a traffic accident to stop, identify themselves, and provide reasonable assistance to anyone who appears injured. Reasonable assistance can mean calling 911, staying at the scene until help arrives, or providing basic first aid if you are trained. Leaving without doing these things is the offense commonly known as a hit-and-run.
Penalties scale with severity. Property-damage-only cases are typically misdemeanors. When someone is injured, the charge often escalates to a felony, and when the accident results in a death, penalties can include years in prison. A conviction usually brings license suspension and an order to pay restitution on top of the criminal sentence.
A small number of states go further and impose a general duty to rescue: any bystander who witnesses someone in grave physical danger must provide reasonable help, such as calling emergency services, as long as doing so doesn’t put the bystander at risk. Penalties for violating these laws are typically minor fines rather than jail. They are the rare instance of criminal liability attaching to pure inaction by someone with no prior connection to the victim.
Not Paying Court-Ordered Child Support
Falling behind on child support is not only a civil contempt issue. Under the Deadbeat Parents Punishment Act, willfully failing to pay support for a child living in another state is a federal crime once the unpaid amount exceeds $5,000 or remains overdue for more than a year. A first offense is a misdemeanor carrying up to six months in prison.4Office of the Law Revision Counsel. 18 USC 228 – Failure to Pay Legal Child Support Obligations
The charges get more serious from there. Arrears above $10,000 or unpaid for more than two years make the offense a felony punishable by up to two years in prison. A second offense under the lower threshold also becomes a felony. Courts must order full restitution of the unpaid balance on conviction, so a prison sentence does not erase the debt.4Office of the Law Revision Counsel. 18 USC 228 – Failure to Pay Legal Child Support Obligations
Criminal prosecution is only one consequence. States routinely enforce support obligations through wage garnishment, bank levies, property liens, and suspension of driver’s and professional licenses. Once arrears exceed $2,500, the State Department can deny or revoke your passport. These tools operate automatically through the state child-support-enforcement system, often without a separate court hearing.
Not Filing Tax Returns
Willfully failing to file a federal tax return is a misdemeanor punishable by up to one year in prison and a fine of up to $25,000 for individuals ($100,000 for corporations).5Office of the Law Revision Counsel. 26 USC 7203 – Willful Failure to File Return, Supply Information, or Pay Tax The word “willfully” carries weight. The IRS must prove you intentionally chose not to file, not merely that you forgot or were disorganized. That distinction offers less protection than people assume: filing in some years and not others, or earning substantial income without filing, makes willfulness easy to infer.
Even without a criminal prosecution, penalties stack quickly. The failure-to-file penalty is 5% of the unpaid tax per month, capped at 25%. If your return is more than 60 days late, a minimum penalty of $525 (or 100% of the unpaid tax, whichever is less) applies.6Internal Revenue Service. Failure to File Penalty A separate failure-to-pay penalty of 0.5% per month runs alongside it, and interest accrues on top.
Not filing does not keep the IRS in the dark. The agency already has your W-2s, 1099s, and other income reports. When no return arrives, the IRS can prepare a substitute for return using only the income data it has, with none of the deductions, credits, or filing-status choices you would have claimed.7Internal Revenue Service. 4.25.8 Delinquent Returns and SFR Procedures The resulting bill is almost always higher than one you would have owed on a return you filed yourself. Once the assessment is final, the IRS can garnish wages, levy bank accounts, and file federal tax liens. If the total tax debt crosses roughly $64,000 (a threshold adjusted annually for inflation), the IRS can certify the debt to the State Department, which will deny or revoke your passport.8Taxpayer Advocate Service. Don’t Let a Passport Revocation Ruin Your International Travel Plans
The penalty structure itself pushes toward filing. The failure-to-file penalty is ten times the failure-to-pay penalty, so filing on time and arranging payment later costs dramatically less than doing nothing.9Office of the Law Revision Counsel. 26 USC 6651 – Failure to File Tax Return or to Pay Tax
Failing to Register as a Sex Offender
Under the Sex Offender Registration and Notification Act (SORNA), anyone convicted of a qualifying sex offense must register with the appropriate authorities and update that registration whenever they move, change jobs, or change names. Knowingly failing to register or update a registration is a federal felony punishable by up to 10 years in prison.10Office of the Law Revision Counsel. 18 USC 2250 – Failure to Register
Federal jurisdiction applies when the offender was convicted under federal, military, or tribal law, or when the offender has traveled in interstate commerce. State registration laws add their own penalties on top, and most treat failure to register as a felony. Enforcement is heavy: the U.S. Marshals Service runs a dedicated fugitive task force focused on unregistered sex offenders.
Failing to Register for Selective Service
Male U.S. residents between the ages of 18 and 25 are required to register with the Selective Service System. Knowingly failing to register is a felony punishable by a fine of up to $250,000, up to five years in prison, or both.11Selective Service System. Benefits and Penalties Federal prosecutions today are rare, but the collateral consequences reach far.
Men who fail to register before turning 26 permanently lose eligibility for federal student financial aid, federal job training programs, and most federal employment. Immigrants who fail to register may be barred from obtaining U.S. citizenship. These consequences are administrative, not criminal, and they can be more disruptive than a fine would have been.
Misprision of Felony
Federal law makes it a crime to know about a felony committed in a federal jurisdiction and take active steps to conceal it. This offense, misprision of felony, carries a fine and up to three years in prison.12Office of the Law Revision Counsel. 18 USC 4 – Misprision of Felony
The line between silence and concealment matters here. Simply knowing about a crime and not volunteering that information to police is not misprision. Prosecutors must prove you took some affirmative step to hide the crime, such as destroying evidence, misleading investigators, or helping the offender avoid detection. The charge is a hybrid: it begins with the omission of not reporting, but it becomes criminal only when paired with an act of concealment. In practice, it usually appears in cases involving fraud, money laundering, or organized crime cover-ups, where prosecutors want leverage beyond the underlying conspiracy charges.