Why taxes exist, and how they work

What taxes actually fund

Taxes are not money disappearing; they are how a shared budget gets paid for. At the federal level, the largest pieces are Social Security, Medicare and Medicaid, national defense, and interest on the national debt. Together these make up most of federal spending, with the remainder covering everything from veterans’ benefits and food assistance to courts, roads, and scientific research (fiscaldata.treasury.gov). State and local taxes fund schools, police and fire, roads, and courts closer to home. Whatever you think of any specific spending choice, the mechanism is the same one behind any shared cost: everyone who benefits from roads, courts, and national defense contributes to them, because no individual would build them alone.

The four kinds you’ll actually meet

• Income tax: a percentage of what you earn, collected by the federal government and most states, generally rising as income rises.
• Payroll tax: a flat percentage taken specifically from wages to fund Social Security and Medicare; see the next lesson for the exact rates.
• Sales tax: a percentage added to purchases, set by states and cities, so it varies by where you buy something.
• Property tax: an annual tax on the value of real estate, mainly funding local schools and services; it’s why renters feel it indirectly through rent, and owners see it directly on a bill.

How “marginal” brackets actually work

Income tax brackets scare people because “37% tax rate” sounds like the government takes over a third of everything you make. It does not work that way. A marginal tax system taxes each slice of income at the rate for that slice, not your whole income at your top rate. The table below uses the actual 2026 tax year federal brackets for a single filer as an illustration of the mechanism (irs.gov). Brackets are adjusted for inflation most years, so treat the specific dollar figures as “as of 2026,” not permanent:

One thing to fix in your head before the arithmetic: brackets apply to taxable income, which is what is left after the standard deduction (or itemized deductions) comes off your total income. Filing basics covers that subtraction; this example starts after it, with $60,000 of taxable income.

Someone with $60,000 of taxable income does not pay 22% on all $60,000. They pay 10% on the first $12,400 ($1,240), 12% on the next $38,000 up to $50,400 ($4,560), and 22% only on the $9,600 above that ($2,112): $7,912 in total. Their effective rate, total tax divided by income, is about 13.2%, even though their marginal rate (the rate on their next dollar earned) is 22%. Earning a raise that pushes you into a higher bracket never makes your take-home pay go down; it only means dollars above the threshold are taxed at the new rate, never the dollars below it. (Losing a means-tested benefit or credit as income rises is a separate effect, and it can bite.)

What Jesus and Paul actually said

Asked whether it was lawful to pay tax to Caesar (a loaded political trap, since Rome was a pagan occupying power, not Israel’s own covenant government), Jesus asked whose image was on the coin, then answered: “Render therefore unto Caesar the things which are Caesar’s; and unto God the things that are God’s” (Matthew 22:21, KJV). He did not rule on whether Rome’s taxes were fair; he separated the question of paying what a governing authority is owed from the question of ultimate allegiance, and refused to let one substitute for the other. Paul, writing to Christians living under that same empire, is more direct still: “pay ye tribute also… render therefore to all their dues: tribute to whom tribute is due” (Romans 13:6-7, KJV). Neither text is a verdict on any specific government’s spending or rates; both assume taxes get paid as a matter of course, as part of living honestly under whatever authority God has placed you.

The practice

Find one number: your own effective tax rate from last year (total tax paid, divided by total income; it’s on your return). Most people guess it far higher than it actually is, because they are thinking in marginal terms without realizing it. Crash Course’s taxes episode is on the video shelf, linked and not embedded. The IRS page for 401(k) limits, which change every year, is on further reading.