2018 State and Federal Tax Calculator
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Reviewed by Calculator Editorial Team
Use this 2018 state and federal tax calculator to estimate your income taxes for the year 2018. The calculator provides estimates for federal income tax, state income tax, and tax deductions based on your income and filing status.
How the 2018 Tax Calculator Works
The 2018 state and federal tax calculator uses the tax brackets and rates that were in effect during that year. It calculates your estimated tax liability by applying the appropriate tax rates to your taxable income after deductions.
Formula Used
Taxable Income = Gross Income - Deductions
Federal Tax = Taxable Income × Federal Tax Rate
State Tax = Taxable Income × State Tax Rate
Total Tax = Federal Tax + State Tax
The calculator uses progressive tax brackets, meaning higher income levels are taxed at higher rates. The exact rates depend on your filing status (Single, Married Filing Jointly, etc.) and the state you reside in.
2018 Federal Income Tax Rates
The 2018 federal income tax rates were as follows:
| Tax Bracket | Single | Married Filing Jointly | Married Filing Separately | Head of Household |
|---|---|---|---|---|
| 0% to $9,525 | 10% | 10% | 10% | 10% |
| $9,526 to $38,700 | 12% | 12% | 12% | 12% |
| $38,701 to $82,500 | 22% | 22% | 22% | 22% |
| $82,501 to $157,500 | 24% | 24% | 24% | 24% |
| $157,501 to $200,000 | 32% | 32% | 32% | 32% |
| $200,001 to $500,000 | 35% | 35% | 35% | 35% |
| $500,001+ | 37% | 37% | 37% | 37% |
These rates are subject to change based on your specific circumstances and any applicable deductions or credits.
2018 State Income Tax Rates
State income tax rates varied significantly across the United States in 2018. The calculator uses the most common state tax rates for each filing status. Note that some states have additional deductions or exemptions that may affect your tax liability.
For an accurate estimate, you should consult a tax professional or use the official tax forms provided by your state's revenue department.
How to Use This Calculator
- Enter your gross income for the year 2018.
- Select your filing status (Single, Married Filing Jointly, etc.).
- Choose your state of residence.
- Enter any applicable deductions.
- Click "Calculate" to see your estimated tax liability.
Example Calculation
Let's calculate the estimated taxes for a single filer with a gross income of $50,000 in California in 2018.
Worked Example
Gross Income: $50,000
Standard Deduction (Single): $12,000
Taxable Income: $50,000 - $12,000 = $38,000
Federal Tax: $38,000 × 12% = $4,560
California State Tax: $38,000 × 1% = $380
Total Estimated Tax: $4,560 + $380 = $4,940
This example shows that a single filer with $50,000 in California would estimate paying approximately $4,940 in federal and state income taxes for 2018.
Frequently Asked Questions
Is this calculator accurate for my specific tax situation?
This calculator provides estimates based on standard tax brackets and rates. For an exact calculation, consult a tax professional or use official tax forms.
Do I need to pay estimated taxes throughout the year?
Yes, if you expect to owe more than $1,000 in taxes after subtracting your withholding and credits, you may need to pay estimated taxes throughout the year.
What are the standard deductions for 2018?
Standard deductions for 2018 were $12,000 for single filers, $24,000 for married filing jointly, and $18,000 for head of household.
Are there any tax credits I should be aware of?
Yes, there are various tax credits available depending on your circumstances, such as the Earned Income Tax Credit (EITC) and the Child Tax Credit. These can significantly reduce your tax liability.