2003 Federal Tax Brackets
The official IRS tax brackets for tax year 2003, frozen as filed — for amended returns, back taxes and research. 6 rates from 10% to 35%; standard deduction $4,750 single / $9,500 joint.
In 2003, federal income tax rates were 10%, 15%, 25%, 28%, 33%, 35%. The top rate applied above $311,950 (single).
- Rates10% · 15% · 25% · 28% · 33% · 35%
- Std. deduction (single / joint)$4,750 / $9,500
- Personal exemption$3,050
- Source2003 Form 1040 instructions (JGTRRA rates)
Enter taxable income (after deductions). Ordinary-income brackets only — capital gains, credits, AMT and phase-outs are separate.
2003 brackets — all filing statuses
Single
| Rate | 2003 taxable income |
|---|---|
| 10% | $0 – $7,000 |
| 15% | $7,001 – $28,400 |
| 25% | $28,401 – $68,800 |
| 28% | $68,801 – $143,500 |
| 33% | $143,501 – $311,950 |
| 35% | $311,951 and up |
Married filing jointly
| Rate | 2003 taxable income |
|---|---|
| 10% | $0 – $14,000 |
| 15% | $14,001 – $56,800 |
| 25% | $56,801 – $114,650 |
| 28% | $114,651 – $174,700 |
| 33% | $174,701 – $311,950 |
| 35% | $311,951 and up |
Head of household
| Rate | 2003 taxable income |
|---|---|
| 10% | $0 – $10,000 |
| 15% | $10,001 – $38,050 |
| 25% | $38,051 – $98,250 |
| 28% | $98,251 – $159,100 |
| 33% | $159,101 – $311,950 |
| 35% | $311,951 and up |
Married filing separately
| Rate | 2003 taxable income |
|---|---|
| 10% | $0 – $7,000 |
| 15% | $7,001 – $28,400 |
| 25% | $28,401 – $57,325 |
| 28% | $57,326 – $87,350 |
| 33% | $87,351 – $155,975 |
| 35% | $155,976 and up |
Standard deduction & exemption
| Filing status | Standard deduction |
|---|---|
| Single | $4,750 |
| Married filing jointly | $9,500 |
| Head of household | $7,000 |
| Married filing separately | $4,750 |
Personal exemption: $3,050 per person.
The 2003 brackets in today’s dollars
Adjusted with the CPI-U (2003 annual average → May 2026), a factor of ×1.82. Useful for comparing bracket creep across eras.
| Single-filer threshold | 2003 dollars | Today’s dollars |
|---|---|---|
| 15% bracket started at | $7,001 | ≈ $12,800 |
| 25% bracket started at | $28,401 | ≈ $51,700 |
| 28% bracket started at | $68,801 | ≈ $125,300 |
| 33% bracket started at | $143,501 | ≈ $261,400 |
| 35% bracket started at | $311,951 | ≈ $568,200 |
← 2002 bracketsAll years2004 brackets →
Frequently asked questions
What were the federal tax brackets in 2003?
There were 6 rates in 2003: 10%, 15%, 25%, 28%, 33%, 35%. For single filers the top 35% rate applied to taxable income over $311,950.
What was the standard deduction in 2003?
$4,750 for single filers, $9,500 married filing jointly, $7,000 head of household; the personal exemption was $3,050.
Marginal vs. effective rate — what's the difference?
Your marginal rate is the tax on your last dollar (your bracket). Your effective rate is total tax divided by taxable income — always lower, because earlier dollars fill the lower brackets first. The calculator above shows both.
Why would I need 2003 brackets now?
Filing or amending a 2003 return, negotiating back taxes for that year, checking an audit figure, or research. Brackets never change retroactively once the year closes.
Sources & methodology
Sources: 2003 Form 1040 instructions (JGTRRA rates) · All years: Tax Foundation historical brackets.
Figures transcribed from the primary source listed and cross-checked against the Tax Foundation and Tax Policy Center datasets. Not tax advice.