2018 Usa Lincome Tax Calculator
'/%3E%3Ccircle cx='48' cy='39' r='19' fill='%23f2c9a5'/%3E%3Cpath d='M27 35c3-16 39-17 42 2-8-8-27-9-42-2z' fill='%23374151'/%3E%3Cpath d='M21 86c5-24 49-28 56 0z' fill='%232563eb'/%3E%3Ccircle cx='41' cy='41' r='2' fill='%23111827'/%3E%3Ccircle cx='55' cy='41' r='2' fill='%23111827'/%3E%3Cpath d='M42 52c4 3 9 3 13 0' stroke='%2392400e' stroke-width='3' fill='none' stroke-linecap='round'/%3E%3C/svg%3E)
Reviewed by Calculator Editorial Team
Calculate your 2018 USA federal income tax with this accurate tax calculator. Enter your gross income and filing status to determine your tax liability according to the 2018 tax brackets and rates.
How to Use This Calculator
Using this calculator is simple:
- Enter your gross income in the first field.
- Select your filing status from the dropdown menu.
- Click "Calculate" to see your estimated tax liability.
- Review the breakdown of your tax calculation.
The calculator uses the 2018 USA federal income tax brackets and rates to provide an accurate estimate of your tax liability.
How the 2018 USA Tax System Works
The 2018 USA federal income tax system uses progressive tax brackets, meaning higher income levels are taxed at higher rates. The tax brackets and rates for 2018 were as follows:
| Tax Bracket | Single Filers | Married Filing Jointly | Married Filing Separately | Head of Household |
|---|---|---|---|---|
| 10% | $0 - $9,525 | $0 - $19,050 | $0 - $9,525 | $0 - $13,600 |
| 12% | $9,526 - $38,700 | $19,051 - $77,400 | $9,526 - $38,700 | $13,601 - $51,800 |
| 22% | $38,701 - $82,500 | $77,401 - $165,000 | $38,701 - $82,500 | $51,801 - $82,500 |
| 24% | $82,501 - $157,500 | $165,001 - $315,000 | $82,501 - $157,500 | $82,501 - $157,500 |
| 32% | $157,501 - $200,000 | $315,001 - $400,000 | $157,501 - $200,000 | $157,501 - $200,000 |
| 35% | $200,001 - $500,000 | $400,001 - $600,000 | $200,001 - $300,000 | $200,001 - $500,000 |
| 37% | $500,001+ | $600,001+ | $300,001+ | $500,001+ |
Tax Calculation Formula
The tax is calculated by applying the appropriate tax rate to each portion of income that falls within a specific tax bracket. The formula is:
Tax = (Income in Bracket 1 × Rate 1) + (Income in Bracket 2 × Rate 2) + ... + (Income in Bracket N × Rate N)
Standard deductions were also available for 2018:
- Single filers: $6,350
- Married filing jointly: $12,700
- Married filing separately: $6,350
- Head of household: $9,350
Important Note
This calculator provides an estimate based on the 2018 tax brackets and rates. Actual tax liability may vary based on additional factors such as state taxes, deductions, credits, and exemptions not accounted for in this simplified calculation.
Worked Examples
Example 1: Single Filer with $50,000 Gross Income
For a single filer with $50,000 gross income:
- $9,525 at 10% = $952.50
- $29,175 at 12% = $3,501.00
- $9,300 at 22% = $2,046.00
Total tax = $952.50 + $3,501.00 + $2,046.00 = $6,499.50
Example 2: Married Filing Jointly with $100,000 Gross Income
For a married couple filing jointly with $100,000 gross income:
- $19,050 at 10% = $1,905.00
- $58,350 at 12% = $7,002.00
- $22,600 at 22% = $4,972.00
Total tax = $1,905.00 + $7,002.00 + $4,972.00 = $13,879.00
Frequently Asked Questions
- What is the difference between gross income and taxable income?
- Gross income is your total earnings before any deductions. Taxable income is your gross income minus any eligible deductions and exemptions.
- Are there any deductions or credits not accounted for in this calculator?
- Yes, this calculator provides a simplified estimate. Actual tax liability may differ based on additional deductions, credits, and exemptions you qualify for.
- How do I know if I'm in the correct tax bracket?
- Your tax bracket is determined by your filing status and taxable income. The table in the "How the 2018 USA Tax System Works" section shows the brackets for each filing status.
- Is this calculator accurate for my specific situation?
- This calculator provides an estimate based on the 2018 tax brackets and rates. For precise tax information, consult a tax professional or use official tax preparation software.