2018 Federal Income Tax Calculator Irs
'/%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 federal income tax using this IRS-approved calculator. Enter your taxable income and deductions to determine your federal tax liability for the year 2018. The calculator uses the official 2018 tax brackets and standard deduction amounts.
How to Use This Calculator
To calculate your 2018 federal income tax:
- Enter your total taxable income for the year.
- Select your filing status (Single, Married Filing Jointly, etc.).
- Enter any applicable deductions or adjustments.
- Click "Calculate" to see your estimated federal income tax.
The calculator will display your tax liability, effective tax rate, and a breakdown of how much tax is owed in each bracket.
Tax Formula and Brackets
The 2018 federal income tax is calculated using progressive tax brackets. The formula is:
Tax Calculation Formula
Federal Income Tax = Sum of (Taxable Income × Tax Rate for Each Bracket)
Where Taxable Income is calculated as:
Taxable Income = Gross Income - Deductions - Exemptions
The 2018 tax brackets for single filers are:
| Taxable Income | Tax Rate |
|---|---|
| $0 - $9,525 | 10% |
| $9,526 - $38,700 | 12% |
| $38,701 - $82,500 | 22% |
| $82,501 - $157,500 | 24% |
| $157,501 - $200,000 | 32% |
| $200,001 - $500,000 | 35% |
| $500,001+ | 37% |
The standard deduction for single filers in 2018 was $6,350.
Example Calculation
Let's calculate the federal income tax for a single filer with $50,000 in taxable income:
- First $9,525 at 10% = $952.50
- Next $29,175 ($38,700 - $9,525) at 12% = $3,501.00
- Remaining $8,305 ($50,000 - $38,700) at 22% = $1,827.10
Total federal income tax = $952.50 + $3,501.00 + $1,827.10 = $6,280.60
Effective tax rate = ($6,280.60 / $50,000) × 100 = 12.56%
Common Questions
What is the difference between taxable income and gross income?
Gross income is all income before any deductions. Taxable income is gross income minus deductions, exemptions, and other adjustments.
How do I find my taxable income?
Subtract your deductions and exemptions from your gross income to get your taxable income.
What is the standard deduction?
The standard deduction reduces your taxable income by a fixed amount. In 2018, the standard deduction for single filers was $6,350.
Frequently Asked Questions
- What is the 2018 federal income tax rate?
- The 2018 federal income tax rates range from 10% to 37%, depending on your taxable income and filing status.
- How do I calculate my federal income tax?
- Enter your taxable income, filing status, and any deductions into the calculator to determine your federal income tax.
- What is the standard deduction for 2018?
- The standard deduction for single filers in 2018 was $6,350. Married filing jointly filers had a standard deduction of $12,700.
- How does the tax bracket system work?
- The tax bracket system applies different tax rates to different portions of your taxable income. The first portion is taxed at the lowest rate, and each subsequent portion is taxed at a higher rate.
- What is the difference between taxable income and gross income?
- Gross income is all income before any deductions. Taxable income is gross income minus deductions, exemptions, and other adjustments.