Tax law in the United States is not a single document. It is a layered system of statutes (the Internal Revenue Code), treasury regulations, IRS guidance, revenue rulings, revenue procedures, and court decisions that together determine how income is reported and taxed for individuals and businesses. Tax law encompasses legal rules governing how governments levy and collect taxes at the federal, state, and local level.

For wage earners, small business owners, gig workers, and anyone already facing IRS collections, these rules are not abstract. They control whether the IRS can place a lien on your home, garnish your wages, or accept a settlement for less than you owe. Clear rules about tax obligations promote taxpayer compliance; understanding them protects your rights. Free consultations with firms like Lexington Tax Group help assess tax resolution needs before problems escalate.

This article covers:

• The constitutional basis of federal taxing power
• Structure of the Internal Revenue Code and federal regulations
• How federal income tax works for individuals and businesses
• State and local tax interactions
• IRS enforcement tools, case law, and taxpayer rights
• Tax resolution programs (Offers in Compromise, payment plans, Fresh Start)
• When to seek professional help

Constitutional Basis of the Taxing Power

The U.S. Constitution grants Congress the authority to impose taxes under Article I, Sections 7 and 8. Before 1913, federal income taxation faced a constitutional obstacle: the Supreme Court’s 1895 ruling in Pollock v. Farmers’ Loan & Trust Co. held that taxes on income from property were direct taxes requiring apportionment among the states by population. The Sixteenth Amendment, ratified in 1913, removed that barrier. It authorized Congress to tax incomes “from whatever source derived, without apportionment.” The Revenue Act of 1913 followed within months. All U.S. citizens are subject to federal income tax under this authority. By 1985, the national government collected over $450 billion in income tax revenue.

Legislation is necessary for taxes to be imposed legally. Congress cannot tax by executive order; every federal tax must originate in a bill passed by both chambers and signed into law. State governments and local governments hold separate taxing power under their own constitutions. New York City imposes a city income tax; many Ohio municipalities levy local wage taxes; property tax is administered at the county level in most states.

Core constitutional principles:

• Taxes must be enacted by public law through Congress or a state legislature
• No bills of attainder or ex post facto tax laws
• The Sixteenth Amendment permits income taxation without apportionment
• Taxpayers are granted rights including the right to be informed and the right to challenge tax authorities under due process

Structure and Contents of Federal Tax Law: Internal Revenue Code

The Internal Revenue Code (IRC) is Title 26 of the United States Code. The current version, the Internal Revenue Code of 1986, was enacted that year and has been amended by every major tax bill since, including the Tax Reform Act of 1986, the Tax Cuts and Jobs Act of 2017, and the Inflation Reduction Act of 2022. Each of these was a separate piece of legislation signed into law that modified specific code provisions.

Taxpayers must comply with the Internal Revenue Code’s requirements. Income tax is assessed on earned and unearned income. Tax structures utilize marginal tax brackets for progressive taxation, meaning higher income is taxed at higher rates. Corporate tax regulations guide business structures and deductions under Subtitle A. Estate and gift tax laws govern wealth transfer during life and after death. Partnership tax rules determine how pass-through income is allocated among partners.

Key IRC sections for taxpayers concerned with IRS debt:

IRC Section	Subject	Why It Matters
§61	Gross income definition	Starting point for all income tax calculations
§162	Business expenses	Controls which deductions businesses can claim
§6012	Filing requirements	Sets who must file a return
§6321	Federal tax lien	Creates automatic lien on property for unpaid taxes
§6331	Levy authority	Authorizes IRS seizure of wages, bank accounts
§7122	Offer in Compromise	Legal basis for settling tax debt for less
§7803(a)(3)	Taxpayer Bill of Rights	Codifies ten enforceable taxpayer protections

Provisions change each tax year. Standard deduction amounts, credit eligibility, and rate brackets for 2024 differ from 2023 and prior years. When addressing back taxes, confirm which tax year code applies to each liability.

Treasury Regulations and Other Official IRS Guidance

Treasury regulations appear in Title 26 of the Code of Federal Regulations and carry near-binding legal weight. Courts defer to them unless they are plainly unreasonable. Below regulations in the hierarchy sit revenue rulings, revenue procedures, notices, and announcements. At the bottom are informal materials like IRS FAQs and website pages. Taxpayers can rely on IRS FAQs for general guidance, but these do not carry the same legal authority as statutes or regulations.

The IRS publishes official tax guidance weekly in the Internal Revenue Bulletin. All revenue rulings and administrative rules that IRS agents and tax resolution professionals use in negotiations appear there.

One example: IRC §162 allows deductions for “ordinary and necessary” business expenses, but the statute does not define those terms. Treasury Regulation §1.162-1 fills the gap, specifying that an expense must be customary in the taxpayer’s industry, reasonable in amount, and directly connected to the trade or business. This is the regulation IRS examiners cite when they disallow a deduction during an audit. Tax professionals at firms like Lexington Tax Group use these same regulations when challenging an examiner’s position.

Federal Income Tax Basics for Individuals and Small Businesses

Federal income tax follows a sequence: gross income (under §61) minus adjustments equals adjusted gross income (AGI). From AGI, the taxpayer subtracts either the standard deduction or itemized deductions to reach taxable income. Tax liability changes based on how income or deductions are classified.

Voluntary compliance means taxpayers are responsible for accurate tax calculations and payments. The IRS relies on this system; it does not calculate your tax for you. Tax evasion, by contrast, is the illegal act of misrepresenting or concealing information to reduce tax liability. Tax law affects operational costs and profit margins for businesses by influencing deductions and liabilities. Indirect taxes like sales tax, VAT, and excise taxes operate alongside income taxation but under separate code provisions.

Consider three scenarios:

• W-2 employee with two jobs. Neither employer knows the other exists for withholding purposes. The combined income pushes the taxpayer into a higher bracket, but withholding was calculated at each job’s lower rate. Result: a tax bill at filing, plus potential underpayment penalties.
• 1099 contractor. A freelance graphic designer earns $95,000, deducts home office and equipment costs on Schedule C, but fails to make quarterly estimated payments. Self-employment tax (Social Security and Medicare) adds roughly 15.3% on top of income tax. The IRS assesses penalties and interest on the underpayment.
• Small LLC owner. An LLC with $300,000 in revenue commingles personal and business expenses. The IRS disallows $40,000 in deductions during audit, increasing the owner’s taxable income and triggering a balance due with penalties.

Common triggers for IRS scrutiny include large Schedule C losses year after year, unreported 1099 income, cryptocurrency transactions, and mismatches between reported income and third-party information returns.

State and Local Tax: How Federal Tax Laws Interact with Local Tax Systems

Most states maintain an income tax system. Some states do not impose income taxes at all; Florida, Texas, and Nevada are notable examples. States cannot tax the same income twice under the Internal Consistency Test, a principle the Supreme Court has applied in interstate taxation disputes. Tax laws vary between states and federal laws, though state tax regulations are often less complex than federal regulations.

Federal AGI typically serves as the starting point for state taxable income calculations. States then apply their own additions and subtractions; for instance, some states add back the federal deduction for state taxes paid.

Consider a Wisconsin resident who owes the IRS $45,000 for tax years 2019 through 2022 and also has $12,000 in unpaid Wisconsin state income tax. The state Department of Revenue has placed a lien on the taxpayer’s home. The IRS has also filed a Notice of Federal Tax Lien. Resolving both requires separate negotiations with federal and state authorities; a payment plan with the IRS does not address the state balance.

Other areas of concern include sales and use tax audits for small businesses, payroll tax assessments from state agencies, and local property tax delinquencies that can lead to foreclosure independent of any federal tax issues.

Enforcement, Case Law, and Taxpayer Rights

Tax liens are legal claims against a taxpayer’s property. A federal tax lien arises automatically when taxes are assessed, a demand is made, and the taxpayer neglects or refuses to pay (IRC §6321). Tax liens can affect credit ratings and property sales. They are imposed when taxes remain unpaid after due dates and can remain in effect for up to 10 years.

Wage garnishment can occur due to unpaid debts. Up to 25% of disposable income can be garnished for general debts. Federal law limits wage garnishment for child support to 50%. Creditors must obtain a court order for wage garnishment, though IRS levies on wages under §6331 do not require a court order; they require only proper IRS notice and a 30-day waiting period. Wage garnishment can affect employment relationships negatively.

The burden of proof lies with the taxpayer in disputes with tax authorities in most circumstances. Case law from the U.S. Tax Court, federal district courts, and Courts of Appeals interprets ambiguous provisions. Court decisions on what constitutes “reasonable cause” for penalty abatement, or how to substantiate deductions, bind IRS agents in the relevant jurisdiction.

The Taxpayer Bill of Rights (codified in IRC §7803(a)(3)) provides these protections:

• Right to Be Informed: the IRS must explain what you need to do to comply
• Right to Pay No More Than the Correct Amount: overpayments must be refunded or credited
• Right to Challenge the IRS and Be Heard: you can dispute IRS positions and present documentation
• Right to Appeal: independent review of IRS decisions through the Office of Appeals
• Right to Retain Representation: you can hire an attorney, CPA, or enrolled agent at any stage
• Right to Finality: you are entitled to know when the IRS can no longer audit or collect

Tax Resolution Under the Tax Code: Offers in Compromise, Payment Plans, and More

Tax forgiveness programs can reduce or eliminate tax debts. The IRS offers various tax forgiveness options for eligible taxpayers, and tax forgiveness can help alleviate financial burdens for individuals facing collection actions.

The Fresh Start Program was introduced in 2011 by the IRS. It helps taxpayers with financial difficulties by expanding access to streamlined installment agreements and Offers in Compromise. It offers relief options for taxpayers owing back taxes and aims to reduce tax liabilities for eligible taxpayers. Taxpayers can qualify for the program based on income levels and other financial criteria.

An Offer in Compromise allows taxpayers to settle tax debts for less than the full balance owed. IRC §7122 and Treasury Regulation §301.7122-1 authorize this program. Taxpayers must demonstrate inability to pay full tax liabilities. The IRS accepts Offers in Compromise based on specific criteria: doubt as to collectibility, doubt as to liability, or effective tax administration. Submitting an Offer in Compromise requires a non-refundable fee (currently $205, waived for low-income applicants). The IRS reviews Offers in Compromise for financial information accuracy using the Reasonable Collection Potential formula.

Two scenarios:

• A self-employed taxpayer owes $78,000 for tax years 2018 through 2022. After submitting Form 656 with Form 433-A, the IRS calculates an RCP of $14,500 based on limited assets and modest income. The OIC is accepted at $14,500, payable as a lump sum (20% upfront, remainder in five payments).
• A small business owner with $120,000 in payroll tax debt cannot pay in full but has steady monthly revenue. Lexington Tax Group negotiates a partial-pay installment agreement at $1,200 per month, structured so the remaining balance expires when the collection statute runs out.

For a full breakdown of payment plans and relief programs, Lexington Tax Group’s enrolled agents and tax attorneys can evaluate which path fits your situation.

When to Seek Professional Help With Tax Law Issues

Contact a tax law professional if you receive a CP504 or LT11 notice (intent to levy), a filed Notice of Federal Tax Lien, have multiple unfiled returns going back to 2017 or earlier, or face an active audit or payroll tax assessment.

Tax attorneys provide legal advice on tax disputes. They represent clients in negotiations with the IRS, help clients understand complex tax laws, assist in preparing tax returns and filings, and can represent clients in tax court. Enrolled agents are licensed by the IRS. They can represent taxpayers before the IRS in audits, appeals, and collections. Enrolled agents must pass a comprehensive exam and are required to complete continuing education courses. CPAs handle accounting, return preparation, and certain representation matters.

Many tax resolution services offer free initial consultations. Free consultations can clarify potential tax relief options before you commit. Lexington Tax Group offers a free phone or online consultation, a 3-business-day money-back guarantee during the investigation phase, in-depth review of IRS transcripts and state tax records, and a tailored resolution strategy built by enrolled agents and tax attorneys.

If you owe back taxes or face IRS enforcement, schedule a free consultation with Lexington Tax Group to identify your best path forward.

Gather these documents before your consultation:

• All recent IRS notices (CP504, LT11, lien notices)
• Tax returns for each year with a balance due
• W-2s, 1099s, and pay stubs for current and prior years
• Bank statements for the past three months
• Asset documentation (real estate, vehicles, retirement accounts)
• State tax notices or correspondence

Staying Compliant: Practical Tips to Avoid Future Tax Problems

Taxpayers must file and pay taxes on time to avoid penalties. Taxpayers must maintain records supporting their income and deductions during audits. Good tax systems aim for fairness, simplicity, and transparency; your personal tax system should follow the same principles.

Life changes (marriage, divorce, launching a business, selling real estate, large investment gains) alter your tax obligations under the current tax code. Each of these events should trigger a review of your withholding, estimated payments, and filing status.

Annual tax compliance checklist:

• Review and update your Form W-4 after any change in income or filing status
• Make quarterly estimated tax payments if you earn 1099 or business income
• Set aside 25-30% of self-employment income in a separate tax savings account
• Reconcile all 1099s and W-2s against your records before filing
• Use your IRS online account to check balances, transcripts, and payment history
• Keep receipts and documentation for all claimed deductions for at least three years
• File by the deadline or request an extension (extension to file is not extension to pay)
• If you resolved past tax debt, confirm your five-year OIC compliance obligations are on track

For ongoing support after resolving IRS debt, Lexington Tax Group’s tax relief services include compliance planning to prevent future problems.