The AI Playground

One of the most common tax misunderstandings is that "moving into a higher bracket" means all your income gets taxed at the higher rate. It does not. The US uses a progressive bracket system: each chunk of your income is taxed at the rate for the bracket it falls in.

If you are a single filer earning $95,000 in 2024, your taxable income after the standard deduction ($14,600) is $80,400. That $80,400 gets split:

• 10% on the first $11,600 = $1,160
• 12% on the next $35,550 = $4,266
• 22% on the remaining $33,250 = $7,315

Total federal tax: $12,741. Your marginal rate is 22% (the bracket your last dollar fell into). Your effective rate is $12,741 / $95,000 = 13.4%. The slider above does this math for you the moment you change income or filing status.

The marginal rate tells you the tax cost of your next dollar - critical for decisions like: "Should I take that bonus? Contribute more to my 401(k)? Sell stock this year or next?" If your marginal rate is 24%, every $1,000 of pre-tax 401(k) contribution saves you $240 in current-year tax.

The effective rate is the share of total income that actually goes to federal tax. It is always lower than your marginal rate (sometimes much lower) and is the right number to use when budgeting takehome or comparing tax burden across filing statuses.

Use this tool to test both:

• Try the same income across Single, Married Filing Jointly, and Head of Household to see how the brackets shift.
• Add $10,000 to your income and watch the marginal rate stay the same while the effective rate creeps up.

To keep results fast and honest, this estimator covers federal income tax only and uses the standard deduction. It does not include:

• State income tax (varies widely - California, New York, and Oregon take meaningful bites; Texas, Florida, and Washington take none)
• FICA (Social Security + Medicare = 7.65% from your paycheck if W-2; 15.3% if self-employed - see our LLC vs S-Corp calculator)
• Itemized deductions (mortgage interest, charitable giving, SALT cap)
• Tax credits (Child Tax Credit, EITC, retirement savings credit)
• AMT (rare but real for high earners with significant ISO exercises or large state tax deductions)

For any of these, talk to a CPA or use our Tax Copilot for a tailored walkthrough.

If your marginal rate is 22% or higher, these moves are usually worth running the math on:

1. Max your 401(k) - up to $23,000 in 2024 ($30,500 if 50+). At 24% marginal, that saves $5,520 in federal tax this year.
2. Open and fund an HSA if you have a qualifying high-deductible plan - $4,150 single / $8,300 family limit. Triple tax-advantaged.
3. Front-load charitable giving in a single year (bunching) to clear the standard deduction and itemize.
4. Harvest investment losses in taxable accounts to offset gains and up to $3,000 of ordinary income.
5. Backdoor Roth IRA if your income is over the direct-contribution limit ($161k single / $240k married in 2024).