The math behind this calculator (click to expand)
Federal income tax uses progressive brackets that stack: each dollar of taxable income is taxed at the bracket it falls into, not your highest bracket. The formula is the sum across brackets of (min(taxable, bracket.max) - bracket.min) * bracket.rate when taxable > bracket.min.
For 2026 single: 10% up to $12,400, 12% to $50,400, 22% to $105,700, 24% to $201,775, 32% to $256,225, 35% to $640,600, 37% above. MFJ: rate breakpoints at $24,800, $100,800, $211,400, $403,550, $512,450, and $768,700. HoH: $17,700, $67,450, $105,700, $201,775, $256,200, and $640,600. Marginal rate is the bracket your last dollar lands in. Effective rate is total tax divided by taxable income, always lower than the marginal rate when some income falls in lower brackets.
Implementation by Michael.
Marginal vs. Effective Rate: The Most Misunderstood Concept in Personal Finance
A single filer with $95,000 in taxable income sits in the 22% bracket for 2026. But they don't pay 22% on $95,000 - they pay 22% on only the portion between $50,400 and $95,000. The first $12,400 is taxed at 10% ($1,240). The slice from $12,400 to $50,400 is taxed at 12% ($4,560). And the remaining $44,600 above $50,400 is taxed at 22% ($9,812). Total tax: $15,612. That's an effective rate of about 16.4% - more than five full percentage points below the marginal rate.
This gap between marginal and effective rates widens as income increases. A married couple filing jointly with $200,000 in taxable income has a marginal rate of 24%, but their effective rate is closer to 17%. The progressive structure front-loads lower rates on the first dollars earned, which compresses the effective rate significantly below the marginal rate at every income level.
2026 Federal Tax Brackets
The IRS adjusts bracket thresholds annually for inflation. Here are the 2026 brackets (IRS Rev. Proc. 2025-32) across all three filing statuses this calculator supports:
Single Filers
| Rate | Income Range |
|---|---|
| 10% | $0 - $12,400 |
| 12% | $12,400 - $50,400 |
| 22% | $50,400 - $105,700 |
| 24% | $105,700 - $201,775 |
| 32% | $201,775 - $256,225 |
| 35% | $256,225 - $640,600 |
| 37% | $640,600+ |
Married Filing Jointly
| Rate | Income Range |
|---|---|
| 10% | $0 - $24,800 |
| 12% | $24,800 - $100,800 |
| 22% | $100,800 - $211,400 |
| 24% | $211,400 - $403,550 |
| 32% | $403,550 - $512,450 |
| 35% | $512,450 - $768,700 |
| 37% | $768,700+ |
Head of Household
| Rate | Income Range |
|---|---|
| 10% | $0 - $17,700 |
| 12% | $17,700 - $67,450 |
| 22% | $67,450 - $105,700 |
| 24% | $105,700 - $201,775 |
| 32% | $201,775 - $256,200 |
| 35% | $256,200 - $640,600 |
| 37% | $640,600+ |
How the Standard Deduction Reduces Your Taxable Income
Enter gross income in this calculator. It automatically subtracts the 2026 basic standard deduction - $16,100 for single filers, $32,200 for married filing jointly, or $24,150 for head of household - before applying the brackets. If your salary is $111,100 and you're single with no itemized deductions, the calculator uses $95,000 as taxable income.
Itemizers replace the standard deduction with the sum of mortgage interest, eligible state and local taxes, charitable contributions, and other qualifying expenses. For 2026, the ordinary SALT cap is $40,400 ($20,200 if married filing separately), subject to the income-based phase-down described below. If your itemized total exceeds the standard deduction, itemizing lowers your taxable income further - and potentially drops you into a lower marginal bracket.
Strategic Bracket Management
Understanding where you sit relative to bracket boundaries creates opportunities. A single filer earning $107,350 in taxable income is $1,650 into the 24% bracket. A $1,650 traditional 401(k) contribution pulls that income back to $105,700 - exactly at the 22%/24% boundary. That $1,650 contribution saves $396 in federal tax ($1,650 x 24%) on top of the tax-deferred growth.
HSA contributions work similarly. The 2026 limit is $4,400 for self-only coverage. For the same filer at $105,000, maxing the HSA plus contributing $1,650 to a 401(k) would pull taxable income to $98,950 - comfortably in the 22% bracket. Every dollar redirected from the 24% bracket to pre-tax accounts saves $0.24 in current-year federal tax.
Timing matters too. If you control when you recognize income - say, you can choose when to exercise ISOs or sell assets - bunching income in one tax year and keeping the next year lean can keep more total income in lower brackets over a two-year period, particularly if one year's income would otherwise straddle the 24%/32% boundary at $201,775 (single).
The "Higher Bracket" Myth, Debunked with Real Numbers
"I don't want a raise because it'll push me into a higher bracket." This misunderstanding costs people money and career opportunities. Here's why it's wrong, using the 2026 brackets:
A single filer earning $103,000 in taxable income pays $17,372 in federal tax (effective rate: 16.9%). They get a $5,000 raise, pushing taxable income to $108,000. The additional $5,000 breaks down: $2,700 is taxed in the 22% bracket ($105,700 - $103,000 = $2,700 x 22% = $594), and $2,300 is taxed at 24% ($108,000 - $105,700 = $2,300 x 24% = $552). Total new tax: $17,372 + $594 + $552 = $18,518. After-tax income increased from $85,628 to $89,482 - a net gain of $3,854. The raise put them "in a higher bracket," but they still took home more money. Always.
A Note on AMT
The Alternative Minimum Tax is a parallel tax system that can override the bracket math shown above. If you have significant ISO exercises, large state/local tax deductions, or other AMT preference items, your actual effective rate may differ. The 2026 AMT exemption is $90,100 for single filers and $140,200 for married filing jointly. The exemption phase-out begins at $500,000 and $1,000,000, respectively, and reduces the exemption by 50 cents per excess dollar. This calculator does not model AMT.
Why the Calculator Shows Every Bracket
Crossing a federal income-tax threshold does not subject all prior taxable income to the higher rate. Only the portion above that threshold enters the next bracket, which is why additional taxable income still increases after-federal-tax income in the worked example above. Other programs, credits, and benefits can have separate phaseouts or cliffs that this federal bracket calculation does not model.
The bracket-by-bracket breakdown shows the taxable dollars and tax attributed to each rate, along with marginal and effective rates. It can support a 2026 federal estimate or a first-pass Roth-conversion scenario, but it does not model every credit, deduction, surtax, state tax, or the Alternative Minimum Tax.
What might change in the next 24 months
The TCJA individual provisions were originally scheduled to sunset at the end of 2025. The One Big Beautiful Bill Act, signed in 2025, made the seven-bracket structure, the 37% top rate, the higher standard deduction, and the elimination of personal exemptions permanent - so the old "what happens when TCJA expires" cliff is off the table. The pre-2018 schedule (10%, 15%, 25%, 28%, 33%, 35%, 39.6%) is no longer the default that returns automatically.
Bracket thresholds are inflation-indexed annually under chained CPI (per TCJA's switch from regular CPI). Standard deductions move with the brackets. The 2026 Alternative Minimum Tax exemption is $90,100 single / $140,200 MFJ, with phase-out thresholds of $500,000 and $1,000,000.
Watch the SALT cap most closely. OBBBA raised the ordinary limit to $40,000 for 2025, indexed to $40,400 for 2026. The 2026 cap phases down by 30% of MAGI above $505,000 but not below $10,000. The enhanced cap is scheduled to revert after 2029. For high-property-tax states, the cap and phase-down can materially change the after-tax cost of homeownership for itemizers.