Why do Americans have to do their taxes if the IRS already knows how much they own

What It Is

The U.S. tax system requires individual filers to calculate and report their own income, deductions, and tax liability to the Internal Revenue Service each year. This self-reporting system is fundamentally different from how many developed nations operate, where governments calculate final tax bills for citizens. The process involves documenting income from all sources, claiming eligible deductions and credits, and determining the total tax owed. The complexity of this system is one of the most debated aspects of American fiscal policy.

The modern U.S. income tax system was established with the 16th Amendment in 1913, initially as a tax on the wealthy and corporations. The system evolved significantly after World War II when it became a mass tax affecting millions of middle-class Americans. Throughout the 20th century, various tax reform efforts attempted to simplify the code, but it consistently grew more complex. By 2024, the Internal Revenue Code contained over 74,000 pages of regulations and guidance.

The tax filing process involves several types of forms and categories: W-2 forms from employers, 1099 forms from other income sources, Schedule C for self-employed individuals, and various schedules for deductions and credits. Taxpayers must categorize their financial situation into specific IRS-defined boxes and claim only those deductions and credits they qualify for. The complexity increases for anyone with investments, multiple jobs, or business income. Professional tax preparers, tax software companies, and accountants have become essential intermediaries in this system.

How It Works

When you file taxes, you report income that the IRS already knows about through employer W-2s and financial institution 1099 forms, but you also must report income from sources the IRS never receives information about, such as cash payments, bartering, or informal income. You then itemize deductions or take the standard deduction, and apply any tax credits you qualify for, which requires understanding complex eligibility rules. The IRS then reviews your return and either confirms your calculation or initiates an audit if discrepancies are detected. Most filers never interact with an IRS employee and simply submit their calculated return.

Major tax preparation companies like H&R Block, TurboTax, and Jackson Hewitt process millions of returns annually using specialized software that guides taxpayers through the calculation process. These companies profit by charging fees for preparation services, software subscriptions, and refund anticipation loans, creating a financial incentive to maintain the current system's complexity. CPAs and enrolled agents also prepare returns for individuals and businesses, with typical fees ranging from $500 to several thousand dollars depending on complexity. This industry employed over 400,000 people in 2024.

The actual filing process begins by gathering documentation including W-2s received by January 31st, 1099 forms, receipts for deductible expenses, and records of charitable contributions or medical expenses. Taxpayers then either use IRS Free File software if they qualify, pay for commercial tax software, or hire a professional to prepare their return. The return is then submitted electronically or by mail before the April 15th deadline, with extensions available for those who need additional time. The IRS processes returns throughout the tax season and issues refunds through direct deposit or check.

Why It Matters

The cost of tax compliance to American taxpayers and businesses is estimated at $409 billion annually, according to the National Taxpayer Advocate's office, making it a significant economic burden on the general population. Small businesses especially struggle with tax complexity, with compliance costs consuming resources that could otherwise fund growth and job creation. Individuals often underpay or overpay taxes due to misunderstanding the rules, leading to either penalties and interest owed or delayed refunds of billions in overpaid taxes. The IRS's own research shows that voluntary compliance rates would improve if the system were simpler.

Countries like Japan, Sweden, and South Korea have implemented return-free systems where the government calculates taxes for most citizens, reducing compliance costs and simplifying the process dramatically. In these nations, the average citizen spends no time preparing taxes, while the United States ranks among the worst in OECD nations for tax complexity. Canada simplified its system significantly, reducing the percentage of returns prepared by professionals from 40% to 25% over two decades. Studies show return-free systems have comparable compliance rates to the U.S. system while costing citizens and governments far less.

The current system particularly impacts lower-income Americans who spend proportionally more on tax preparation fees and claim refundable tax credits at lower rates due to the complexity of application processes. Approximately 20 million eligible taxpayers fail to claim the Earned Income Tax Credit each year, missing out on average refunds of $700, largely due to complexity. The system also creates compliance challenges for elderly, disabled, and immigrant populations who may struggle with the process. Modernizing the system could ensure that vulnerable populations access all benefits they're entitled to.

Common Misconceptions

Many people believe the IRS intentionally hides information to force citizens to hire tax preparers, but the reality is that Congress and tax lobby groups have actively prevented the IRS from simplifying the system. The IRS requested authority to offer return-free filing in 1998, but Congress blocked this effort in response to lobbying from tax preparation companies that feared reduced demand for their services. Multiple Congressional proposals for return-free systems have been introduced but died in committee due to industry opposition, not IRS resistance. The agency has stated it lacks the resources and authority to implement simpler systems under current law.

Another misconception is that the IRS could easily calculate what you owe since they know your income, but this ignores that the IRS lacks information on numerous legally required deductions and credits. Deductible expenses like mortgage interest, charitable donations, medical expenses, education credits, child care costs, and dependent claims are not automatically reported to the IRS. Business owners, self-employed individuals, and investors have deductions that depend on their individual circumstances and decisions about how to structure their finances. The IRS genuinely cannot determine your actual tax liability without your input.

Some argue that other countries have simpler systems only because they have higher taxes and fewer deductions, but this is factually incorrect—most return-free nations have comparable or lower top tax rates than the United States. Countries with return-free systems like Australia and the United Kingdom still allow deductions for charitable giving, medical expenses, and business costs, but their systems separate the return-filing obligation from deduction claiming. These nations have determined that most citizens don't need to file returns, with the government filing simple returns based on known income, and citizens only intervening when claiming special deductions. This separation of concerns dramatically reduces complexity for average citizens.

Common Misconceptions