Some common laws everyone should know touch nearly every part of ordinary life: driving a car, cashing a paycheck, signing a lease, buying something online, filing taxes, dealing with police, and getting married or divorced. Most are federal baselines that states build on top of, which means the rule you need often depends on where you live. What follows is a working guide to the rules you’re most likely to run into, and the ones that cost the most when ignored.
Driving and the Road
Once you’re behind the wheel, you’re living under state law. Every state requires you to pass a knowledge test and a driving skills exam before issuing a license. Speed limits are posted based on road design and traffic data, and running a red light or a stop sign can mean a ticket, points on your license, or both.
Nearly every state also requires you to carry minimum liability insurance so that if you cause a crash, you can cover the other party’s medical bills and property damage. Only New Hampshire and Virginia let drivers on the road without a standard policy, and even those states impose alternative financial responsibility requirements.
Drunk driving is where traffic law gets serious fast. Every state sets the legal blood alcohol limit at 0.08 percent for non-commercial drivers, with the exception of Utah, which lowered its limit to 0.05 percent in 2018.1National Highway Traffic Safety Administration. Lower BAC Limits Penalties range from license suspension and fines to jail time, and they escalate sharply for repeat offenses. Commercial drivers face a stricter 0.04 percent threshold. If an officer has reason to suspect impairment, refusing a breath or blood test triggers automatic license penalties in most states under implied consent laws.
Your Rights at Work
Wages and Overtime
The federal minimum wage has been $7.25 per hour since 2009, and it applies to most private-sector workers.2Office of the Law Revision Counsel. 29 USC 206 – Minimum Wage About 30 states and many cities set their own minimums above the federal floor, so check your state’s rate before assuming $7.25 is what you’re owed. Tipped employees have a separate federal cash wage of just $2.13 per hour, with the expectation that tips bring them up to at least $7.25; if tips fall short in a given week, the employer must make up the difference.3U.S. Department of Labor. Minimum Wages for Tipped Employees
If you’re a non-exempt worker and you put in more than 40 hours in a single workweek, your employer owes you overtime at one and a half times your regular rate.4Office of the Law Revision Counsel. 29 USC 207 – Maximum Hours The key word is “non-exempt.” Certain salaried employees in executive, administrative, or professional roles are exempt, and the salary threshold has shifted in recent years. If you’re unsure where you fall, the Department of Labor’s Wage and Hour Division can help you figure it out.
Discrimination and Workplace Safety
Title VII of the Civil Rights Act makes it illegal for employers with 15 or more workers to discriminate in hiring, firing, pay, or working conditions based on race, color, religion, sex, or national origin.5Office of the Law Revision Counsel. 42 USC 2000e-2 – Unlawful Employment Practices Separate federal laws extend protection to age, disability, and genetic information. If you think you’ve been discriminated against, you generally have to file a charge with the Equal Employment Opportunity Commission before you can sue.
Every employer also has a legal duty to provide a workplace free from hazards likely to cause death or serious injury.6Office of the Law Revision Counsel. 29 USC 654 – Duties of Employers and Employees That’s the OSHA general duty clause. More specific regulations spell out requirements for protective equipment, hazardous materials, and air quality. You can file an OSHA complaint without fear of retaliation.
Family and Medical Leave
The Family and Medical Leave Act gives eligible employees up to 12 weeks of unpaid, job-protected leave per year for events like the birth of a child, a serious personal health condition, or caring for a spouse or parent with a serious illness.7Office of the Law Revision Counsel. 29 USC 2612 – Leave Requirement To qualify, you must have worked for your employer for at least 12 months, logged at least 1,250 hours during the previous year, and work at a location where the company employs 50 or more people within a 75-mile radius.8eCFR. 29 CFR Part 825 – The Family and Medical Leave Act of 1993 Those eligibility rules knock out a lot of workers at smaller companies, so don’t assume you’re covered without checking.
Renting a Home
The most fundamental rule in rental housing is the implied warranty of habitability: your landlord must keep the property safe and livable, with working plumbing, heat, and structural soundness throughout your lease. The specific standards come from state and local housing codes, but the basic principle holds in nearly every jurisdiction. If your apartment becomes genuinely uninhabitable and the landlord refuses to fix it, most states give you remedies ranging from rent withholding to lease termination.
Security deposits are regulated at the state level, and the rules vary more than most renters realize. Many states cap the deposit at one to two months’ rent; others impose no ceiling at all. Some states require landlords to hold deposits in separate interest-bearing accounts and return them within a set number of days after you move out. Landlords who violate deposit rules can face penalties or forfeit the right to keep any of the money. Read your state’s landlord-tenant statute before signing.
Your landlord generally cannot walk in whenever they feel like it. Most states require reasonable advance notice, typically 24 hours. Emergencies like burst pipes or fires are the exception, and the entry rules apply even if your lease doesn’t mention them.
The Fair Housing Act makes it illegal for landlords to refuse to rent, set different terms, or otherwise discriminate because of race, color, religion, sex, national origin, familial status, or disability.9Office of the Law Revision Counsel. 42 USC Chapter 45 – Fair Housing Familial status means you can’t be turned away for having children under 18. One area that catches people off guard: a landlord must waive pet restrictions and pet fees for a tenant who needs an assistance animal because of a disability, including emotional support animals, not just trained service dogs.10U.S. Department of Housing and Urban Development. Assistance Animals The landlord can ask for documentation when the disability isn’t obvious, but cannot charge a pet deposit or monthly pet rent for an approved assistance animal.
If you fall behind on rent, your landlord can’t just change the locks. Every state requires a formal eviction process that starts with written notice. For nonpayment, the notice period before a landlord can file in court is typically three to five days, though it ranges from immediate filing in a few states to 30 days in Washington, D.C. Even after that notice expires, the landlord still has to go to court and get a judge’s order before removing you. Self-help evictions, like shutting off utilities or removing your belongings, are illegal virtually everywhere.
Making a Contract That Holds Up
A valid contract requires three things: an offer, acceptance, and consideration. Consideration means each side gives up something of value, whether that’s money, a service, or a promise to do or not do something. Both parties also need legal capacity, which means being at least 18 years old and mentally competent. A contract signed by a minor is generally voidable at the minor’s option.
Not every deal has to be in writing, but some must be. Under a doctrine called the statute of frauds, contracts involving real estate, agreements that can’t be completed within one year, and sales of goods worth $500 or more all require a written and signed document to be enforceable. A handshake deal for a used car or a verbal promise to sell land can leave you with no legal recourse if the other side walks away.
For transactions involving goods, the Uniform Commercial Code fills in gaps most people never think to negotiate. If a seller is a merchant, the goods come with an automatic implied warranty that they’re fit for ordinary use.11Cornell Law School. UCC 2-314 – Implied Warranty: Merchantability; Usage of Trade Any specific promise a seller makes about the product, whether on the packaging or in a conversation, can also create an enforceable express warranty.12Cornell Law School. UCC 2-313 – Express Warranties by Affirmation, Promise, Description, Sample These protections exist whether or not the word “warranty” ever comes up.
Consumer and Privacy Protections
Advertising, Robocalls, and Email
The Federal Trade Commission enforces a straightforward rule: ads must be truthful, not misleading, and backed by evidence when they make factual claims.13Federal Trade Commission. Truth In Advertising That standard applies everywhere, from television to social media, under a federal statute that makes unfair or deceptive business practices unlawful.14Office of the Law Revision Counsel. 15 USC 45 – Unfair Methods of Competition Unlawful
If your phone won’t stop ringing with robocalls, the Telephone Consumer Protection Act is on your side. It restricts the use of auto-dialers and prerecorded voice messages to call your cell phone or home phone without prior consent.15Office of the Law Revision Counsel. 47 USC 227 – Restrictions on Use of Telephone Equipment Violations can result in statutory damages of $500 per call, tripled to $1,500 for willful violations. Registering on the National Do Not Call Registry adds another layer of protection, though political calls and surveys are exempt.
The CAN-SPAM Act governs commercial email. Every marketing message must include a working opt-out mechanism, a valid physical mailing address, and an honest subject line. Once someone opts out, the sender has 10 business days to stop emailing them.16Office of the Law Revision Counsel. 15 USC 7704 – Other Protections for Users of Commercial Electronic Mail
Credit Reports and Financial Privacy
Under the Fair Credit Reporting Act, you’re entitled to a free copy of your credit report from each of the three major bureaus (Equifax, Experian, and TransUnion) once every 12 months.17Office of the Law Revision Counsel. 15 USC 1681j – Charges for Certain Disclosures The only authorized source is AnnualCreditReport.com. As of 2026, all three bureaus also offer free weekly reports through that site, and Equifax provides six additional free reports per year.18Consumer Advice – FTC. Free Credit Reports Checking your reports regularly is one of the most effective ways to catch identity theft early.
Banks, credit unions, and other financial institutions face separate privacy rules under the Gramm-Leach-Bliley Act. Before sharing your personal financial information with outside companies, they must give you clear notice and a genuine opportunity to opt out.19Office of the Law Revision Counsel. 15 USC 6802 – Obligations With Respect to Disclosures of Personal Information That opt-out notice usually arrives as a privacy policy update most people throw away. It’s worth reading, because opting out is the only way to stop your bank from selling your data to marketers.
Filing Your Federal Taxes
If your gross income exceeds a certain threshold, you’re required to file a federal tax return. For 2026, that threshold is tied to the standard deduction: $16,100 for single filers and $32,200 for married couples filing jointly.20Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026 Earn more than that and you owe the IRS a return, even if you don’t end up owing any tax after deductions and credits.
The filing deadline is April 15. Missing it when you owe money triggers a failure-to-file penalty of 5 percent of the unpaid tax for each month the return is late, up to a maximum of 25 percent.21Internal Revenue Service. Failure to File Penalty A separate failure-to-pay penalty of 0.5 percent per month runs on top. Filing late when you’re owed a refund won’t cost you a penalty, but the IRS only gives you three years to claim a refund before you forfeit it entirely. If you can’t finish your return by April 15, a six-month extension is free and automatic, though it only extends the filing deadline, not the payment deadline.
If You Deal With Police
Criminal offenses split into two broad categories. A felony is any crime punishable by more than one year in prison, covering offenses like robbery, assault causing serious injury, and drug trafficking. A misdemeanor carries a maximum sentence of one year or less and includes lower-level offenses like petty theft, simple assault, and minor drug possession. The difference matters beyond sentencing: a felony conviction can cost you voting rights, professional licenses, and the ability to own firearms.
If you’re arrested and questioned by police, the Fifth Amendment requires them to tell you about your rights before a custodial interrogation begins. Miranda warnings cover the right to remain silent, the fact that anything you say can be used against you, and the right to have an attorney present, including an appointed one if you can’t afford a lawyer. Police don’t need to read these warnings during a casual conversation or a routine traffic stop. The trigger is custody plus interrogation. People get tripped up by volunteering information before the warnings are required.
The Fourth Amendment protects you from unreasonable searches and seizures, meaning police generally need a warrant before searching your home. Vehicles get less protection under a long-recognized “motor vehicle exception,” because a car can be driven away while officers wait for a warrant. If an officer has probable cause to believe your vehicle contains evidence of a crime, they can search it on the spot. That exception doesn’t cover locked containers inside the vehicle unless there’s separate probable cause for those containers specifically.
Marriage, Divorce, and Children
All 50 states now allow no-fault divorce, meaning neither spouse has to prove the other did something wrong. The standard grounds are “irreconcilable differences” or an “irretrievable breakdown” of the marriage. Some states still offer fault-based grounds like adultery or abandonment as an alternative, which can sometimes affect property division or alimony. Residency requirements vary, but most states require you to have lived there for a set period, often six months to a year, before you can file.
When children are involved, every state uses guidelines to calculate child support based primarily on parental income. The most common approach is the “income shares” model, which tries to give the child the same proportion of parental income they would have received if the household had stayed intact. Health insurance costs and childcare expenses typically factor in. Courts can deviate from the guidelines when circumstances warrant, but the starting point is always the formula.
Getting married itself involves legal requirements. You need a marriage license issued by a local government office, typically a county clerk. Fees generally range from about $30 to $100 depending on where you apply, and most states impose a short waiting period between obtaining the license and the ceremony. Both parties usually need to appear in person with valid identification.