Meet the Tax Bracket Visualizer: Because Your Marginal Rate Isn't What You Think It Is

"I'm in the 24% tax bracket." No, you're not. Or at least, not in the way most people think. Being in the 24% bracket doesn't mean you pay 24% on all your income. It means your last dollar is taxed at 24%. Your first dollar is taxed at 10%. And thanks to the standard deduction, your first $15,000 (single) or $30,000 (married) is taxed at 0%.

Alistair's Tax Bracket Visualizer shows exactly where each dollar falls — and reveals your actual effective tax rate.

How Progressive Tax Brackets Actually Work

For a single filer in 2026, the brackets look roughly like:

• 10%: $0 – $11,925
• 12%: $11,926 – $48,475
• 22%: $48,476 – $103,350
• 24%: $103,351 – $197,300
• 32%: $197,301 – $250,525
• 35%: $250,526 – $626,350
• 37%: $626,351+

But first: the standard deduction. For a single filer, the first $15,000 or so is taxed at 0%. Then the brackets start.

What the Tool Shows

The microtool takes your income and filing status and visualizes:

• Where each dollar falls: A bracket-by-bracket breakdown of how much of your income is taxed at each rate
• Marginal rate: The rate on your last dollar of income. This is what matters for decisions like "should I work overtime" or "should I do a Roth conversion."
• Effective rate: Your total tax divided by your total income. This is what you actually pay.
• After-tax income: What you keep.

Real Numbers: $100,000 Single Filer

• Income: $100,000
• Filing status: Single
• Standard deduction: ~$15,000 (approximately)

Bracket breakdown:

• $0 – $15,000: Taxed at 0% (standard deduction) — $0 tax
• $15,001 – $26,925: Taxed at 10% — ~$1,190
• $26,926 – $63,475: Taxed at 12% — ~$4,390
• $63,476 – $100,000: Taxed at 22% — ~$8,040

Total tax: ~$13,620

Marginal rate: 22% (your last dollar) Effective rate: 13.6% (what you actually pay)

That's an 8.4 percentage point difference between what people think they pay (their bracket) and what they actually pay (their effective rate). For a married couple in the 24% bracket after deductions, the effective rate often lands in the 14–17% range.

Why This Matters for Financial Decisions

Understanding your actual tax situation changes how you think about:

• Traditional vs. Roth contributions: If your effective rate is 14% but your marginal rate is 22%, the deduction on Traditional contributions is worth 22% — but the tax on withdrawals in retirement might be closer to your effective rate. This is the core of Roth conversion analysis.
• Side income and bonuses: A $5,000 bonus is taxed at your marginal rate (22%), not your effective rate (13.6%). The tool clarifies this.
• Tax-gain harvesting: If you're in the 0% long-term capital gains bracket, you might be able to realize gains tax-free — but you need to know your bracket position to execute it.

Why Everyone Gets This Wrong

Tax preparers file your return but rarely explain the mechanics. Employer withholding is a black box. And most people's understanding of taxes stops at "I got a refund" or "I owed." The bracket you're in and the rate you actually pay are different numbers — and knowing both changes how you make financial decisions.

Alistair breaks it down bracket by bracket, dollar by dollar, so you understand not just your refund — but your rate.

That's what this microtool does. See where every dollar goes.