Income Tax Usa 2018 Calculator
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Reviewed by Calculator Editorial Team
Calculate your 2018 US federal income tax with this accurate calculator. The tool uses the 2018 tax brackets, standard deductions, and filing status options to provide an estimate of your federal income tax liability.
How the 2018 US Income Tax Calculator Works
The 2018 US income tax calculator estimates your federal income tax based on your taxable income and filing status. The calculation follows these steps:
- Subtract your standard deduction from your total income to get taxable income
- Apply the progressive tax brackets to your taxable income
- Calculate the total federal income tax owed
Key Formula
Taxable Income = Total Income - Standard Deduction
Federal Income Tax = Sum of (Taxable Income × Tax Rate for each bracket)
The calculator uses the 2018 tax brackets published by the Internal Revenue Service (IRS). It does not account for state taxes, local taxes, or tax credits.
2018 Federal Income Tax Brackets
The 2018 federal income tax brackets are progressive, meaning higher income levels are taxed at higher rates. Here are the brackets for single filers:
| Taxable Income Range | 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% |
Other filing statuses have different brackets. The calculator automatically applies the correct brackets based on your selection.
Filing Status Options
The US tax code offers several filing status options that affect your tax bracket and standard deduction:
- Single - For individuals who were not married or were married but filed separately
- Married Filing Jointly - For married couples who file a single return
- Married Filing Separately - For married couples who choose to file separate returns
- Head of Household - For individuals who qualify as the head of household
- Qualifying Widow(er) - For certain widows or widowers with dependent children
The calculator uses the appropriate standard deduction and tax brackets for each filing status.
Standard Deduction Amounts
The standard deduction reduces your taxable income. Here are the 2018 standard deductions:
| Filing Status | Standard Deduction |
|---|---|
| Single | $6,350 |
| Married Filing Jointly | $12,700 |
| Married Filing Separately | $6,350 |
| Head of Household | $9,350 |
| Qualifying Widow(er) | $12,700 |
If you itemize deductions instead of using the standard deduction, your taxable income may be lower, potentially reducing your tax liability.
How to Use This Calculator
To use the income tax calculator:
- Enter your total income for the year
- Select your filing status from the dropdown menu
- Click "Calculate" to see your estimated federal income tax
- Review the result and any assumptions used
This calculator provides an estimate. For exact tax calculations, consult a tax professional or use official IRS tax software.
Frequently Asked Questions
What is the difference between taxable income and total income?
Total income includes all income you receive during the year, while taxable income is your total income minus any deductions you qualify for. The standard deduction is the most common type of deduction.
Does this calculator include state taxes?
No, this calculator only calculates federal income tax. State taxes vary by location and are not included in this estimate.
How accurate is this tax calculator?
The calculator provides an estimate based on the 2018 tax brackets and standard deductions. For precise tax calculations, consult a tax professional or use official IRS tax software.
What if I have tax credits or deductions?
This calculator does not account for tax credits or itemized deductions. If you have significant credits or deductions, your actual tax liability may be lower than the estimate provided.
When were the 2018 tax brackets updated?
The 2018 tax brackets were published by the IRS in 2017. The calculator uses these official brackets for accurate estimates.