Understanding US Tax & Federal Spending

Most Americans pay thousands of dollars in federal taxes every year, yet few fully understand how the system works or where the money goes. Tax season brings anxiety, not clarity. These guides break down the essentials — from how your bracket actually works to why the national debt keeps growing.

Federal income tax is the US government's largest revenue source, bringing in approximately $2.4 trillion per year — nearly half of all federal revenue. It applies to wages, salaries, self-employment income, investment income, and most other forms of earnings.

The Standard Deduction

Before any tax is calculated, you subtract the standard deduction from your gross income. For 2024, this is:

• Single: $14,600
• Married Filing Jointly: $29,200
• Head of Household: $21,900

About 90% of taxpayers take the standard deduction. The alternative — itemizing deductions (mortgage interest, state and local taxes, charitable donations) — only makes sense if your itemized deductions exceed the standard deduction. The 2017 Tax Cuts and Jobs Act roughly doubled the standard deduction, which is why far fewer people itemize now.

How Tax Brackets Work

The US has seven progressive tax brackets. The most common misconception is that moving into a higher bracket means ALL your income is taxed at the higher rate. That's not how it works — only the income within each bracket is taxed at that rate:

• 10%: $0 – $11,600
• 12%: $11,601 – $47,150
• 22%: $47,151 – $100,525
• 24%: $100,526 – $191,950
• 32%: $191,951 – $243,725
• 35%: $243,726 – $609,350
• 37%: Over $609,350

A Worked Example

On a salary of $75,000 (single filer):

• Subtract standard deduction: $75,000 − $14,600 = $60,400 taxable income
• First $11,600 at 10% → $1,160
• Next $35,550 ($11,601–$47,150) at 12% → $4,266
• Next $13,250 ($47,151–$60,400) at 22% → $2,915
• Total federal income tax: $8,341 (effective rate: 11.1%)

Even though this person is "in the 22% bracket," their effective rate is just 11.1%. This distinction matters enormously and is frequently misunderstood — even by some financial commentators.

Marginal vs. Effective Rate

Your marginal rate is the rate on your next dollar of income. Your effective rate is your total tax divided by total income. They're always different in a progressive system. A single person needs to earn over $609,350 before any of their income is taxed at 37% — and even then, their effective rate would be well under 37% because lower brackets apply to the first $609,350.

Credits vs. Deductions

A deduction reduces your taxable income. A credit reduces your tax bill directly — dollar for dollar. Credits are far more valuable. The Child Tax Credit ($2,000 per child under 17) is a credit: it reduces your tax bill by $2,000. If you're in the 22% bracket, a $2,000 deduction would only save you $440 in tax. Understanding this difference is key to evaluating tax proposals.

For many Americans — especially those earning under $50,000 — FICA taxes are larger than federal income tax. Yet most people barely know what FICA is. It stands for the Federal Insurance Contributions Act, and it funds Social Security and Medicare.

The Rates

• Social Security: 6.2% on wages up to $168,600 (the "wage base" for 2024). Your employer pays an additional 6.2%, for a combined 12.4%.
• Medicare: 1.45% on all wages, no cap. Your employer pays another 1.45%. Earnings above $200,000 ($250,000 married) face an additional 0.9% Medicare surtax (employee only).
• Total employee share: 7.65% on the first $168,600, then 1.45% (or 2.35%) above that

Why It Hits Middle-Income Workers Hardest

Unlike income tax, FICA has no standard deduction — it applies from dollar one. And the Social Security portion caps at $168,600, meaning someone earning $170,000 and someone earning $10 million pay the same Social Security tax. This makes FICA a regressive tax as a percentage of income: a worker earning $50,000 pays an effective FICA rate of 7.65%, while a CEO earning $5 million pays well under 1%.

The Employer's "Hidden" Share

Your employer pays an additional 7.65% on top of your salary — money you never see on your paycheck. Most economists agree this burden ultimately falls on workers in the form of lower wages. The total payroll tax burden is really 15.3% of wages (up to the Social Security cap). Self-employed workers pay the full 15.3% themselves, though they can deduct the employer-equivalent portion.

What You Get for It

Unlike income tax, FICA creates an individual entitlement. Your Social Security benefits are based on your 35 highest-earning years. The more you earn (up to the cap) and the longer you work, the higher your benefit. The average Social Security retirement benefit is about $1,900/month — modest, but for about 40% of retirees, it represents the majority of their income.

This site focuses on federal taxes, but your total tax burden depends heavily on where you live. State and local governments collectively spend about $3.5 trillion per year — over half the federal total — funded by a patchwork of income taxes, sales taxes, property taxes, and fees.

States With No Income Tax

Nine states impose no state income tax: Alaska, Florida, Nevada, New Hampshire (dividends/interest only), South Dakota, Tennessee, Texas, Washington, and Wyoming. However, these states typically make up the revenue through higher sales taxes, property taxes, or (in Alaska's case) oil revenue. There's no such thing as a tax-free state — the burden just shifts.

The Highest and Lowest

State income tax rates range from flat rates of around 3% (Pennsylvania, Indiana) to progressive systems topping out at 13.3% in California. The combined federal + state marginal rate for a high earner in California or New York can exceed 50%. This is why some high earners relocate to no-income-tax states — a trend that accelerated during COVID-19's remote work shift.

Sales Tax

Most states charge a sales tax on goods (and sometimes services), ranging from 0% (Oregon, Montana, Delaware, New Hampshire) to over 9% when combined with local sales taxes (Tennessee, Louisiana, Arkansas). Unlike the UK's VAT, US sales tax is added at the register — the price on the shelf doesn't include it, which often surprises foreign visitors.

Property Tax

Property taxes fund local governments and school districts. Rates vary enormously — from under 0.3% of property value in Hawaii to over 2% in New Jersey and Illinois. For homeowners, property tax is often the largest single tax they pay after federal income tax, frequently exceeding $5,000-$10,000 per year in high-cost areas.

Explore individual state budgets on our State Budgets page.

The federal budget process is supposed to follow an orderly annual cycle. In practice, it's become increasingly dysfunctional — Congress hasn't passed all appropriations bills on time in decades, leading to recurring continuing resolutions and occasional government shutdowns.

The Budget Calendar (In Theory)

• February: The President submits a budget proposal to Congress — a detailed wishlist of spending and revenue priorities. This is a starting point, not a law.
• March–April: The House and Senate Budget Committees draft a budget resolution, setting overall spending and revenue targets. This is a congressional blueprint.
• May–September: Twelve appropriations subcommittees write the actual spending bills for their areas (defense, education, transportation, etc.). Both chambers must pass all 12 bills.
• October 1: The new fiscal year begins. If appropriations aren't passed, the government either shuts down or operates under a continuing resolution (CR) that extends prior funding levels.

Mandatory vs. Discretionary (Again)

The budget process above only covers discretionary spending — about 27% of the budget. Mandatory programs (Social Security, Medicare, Medicaid) are on autopilot and don't need annual appropriations. To change mandatory spending, Congress must pass separate legislation amending the underlying laws. This is why the annual budget fight, despite all its drama, only directly affects about a quarter of federal spending.

Government Shutdowns

When Congress fails to pass appropriations or a continuing resolution by the start of the fiscal year, "non-essential" government functions shut down. Federal employees are furloughed (sent home without pay, though they're usually paid retroactively), national parks close, passport processing stops, and various government services are suspended. The longest shutdown lasted 35 days (December 2018 – January 2019). Shutdowns cost the economy billions and accomplish nothing practical — they're purely a symptom of political dysfunction.

The Debt Ceiling

Separate from the budget, the debt ceiling is a legal limit on how much the federal government can borrow. Since Congress has already approved the spending that requires borrowing, the debt ceiling is essentially a vote on whether to pay bills that have already been incurred. Failure to raise it would trigger a default — potentially catastrophic for global financial markets. Despite regular brinkmanship, the US has never actually defaulted on its debt.

The US national debt is the total accumulated borrowing of the federal government — every deficit from every year, minus whatever has been repaid. At $35 trillion, it's the largest sovereign debt in history in absolute terms, though relative to the economy (about 120% of GDP), it's comparable to Japan, Italy, and post-WWII America.

How Did We Get Here?

The debt-to-GDP ratio was about 35% in 2007. Three major events drove it upward:

• 2008 Financial Crisis — Bank bailouts (TARP), stimulus spending, and collapsing tax revenue during the recession doubled the ratio to about 70% by 2012
• COVID-19 (2020-2021) — $5+ trillion in emergency spending (stimulus checks, PPP loans, enhanced unemployment, vaccine development) pushed the ratio past 100%
• Structural deficits — Even in "good" years, the combination of tax cuts (2017 TCJA), rising mandatory spending, and growing interest costs has kept deficits above $1 trillion annually

Who Owns the Debt?

• The public (~$28 trillion): Held by investors, pension funds, mutual funds, banks, foreign governments, state/local governments, and the Federal Reserve (~$5 trillion from quantitative easing)
• Intragovernmental (~$7 trillion): Government trust funds (mainly Social Security and Medicare) that hold Treasury securities as their reserves
• Foreign holders (~$8 trillion): Japan (~$1.1T) and China (~$770B) are the largest foreign creditors, followed by the UK, Luxembourg, and Canada

Despite common belief, China holds only about 3% of total US debt. The majority is held domestically.

The Interest Problem

The real concern isn't the debt itself but its cost. Net interest payments hit $882 billion in FY2024 — exceeding the defense budget for the first time. As older, low-interest debt matures and is refinanced at today's higher rates, interest costs will continue climbing even if no new debt is added. The CBO projects interest costs will exceed $1 trillion annually within a few years, consuming an ever-larger share of the budget and leaving less room for everything else.

Can the US Default?

In theory, no — the US borrows in dollars and can always issue more dollars (through the Federal Reserve) to pay its debts. This is why US Treasury bonds are considered the world's safest investment and the "risk-free rate" that underpins global finance. In practice, excessive money creation would cause inflation, and political brinkmanship around the debt ceiling creates artificial default risk. A genuine default, though unlikely, would be catastrophic — triggering a global financial crisis far worse than 2008.