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Tax Return Calculator Usa 2018

Reviewed by Calculator Editorial Team

Use this tax return calculator to estimate your 2018 US federal income tax liability. The calculator provides a simplified estimate based on standard deductions and tax brackets for single filers. For exact calculations, consult a tax professional or use official IRS forms.

How to Use This Calculator

To estimate your 2018 US federal income tax:

  1. Enter your total taxable income for 2018 in the calculator.
  2. Select your filing status (Single, Married Filing Jointly, etc.).
  3. Click "Calculate" to see your estimated tax liability.
  4. Review the breakdown of your tax calculation.

The calculator uses the 2018 tax brackets and standard deductions. It does not account for itemized deductions, tax credits, or state taxes.

Formula Used

The tax calculation follows these steps:

  1. Subtract the standard deduction from your taxable income.
  2. Apply the progressive tax rates to the taxable amount.
  3. Sum the taxes from each bracket.
Taxable Amount = Taxable Income - Standard Deduction Tax = Σ (Taxable Amount × Rate for each bracket)

The standard deductions for 2018 were:

  • Single: $6,350
  • Married Filing Jointly: $12,700
  • Head of Household: $9,350

Worked Example

Let's calculate the tax for a single filer with $50,000 taxable income:

  1. Taxable Amount = $50,000 - $6,350 = $43,650
  2. Apply 2018 tax brackets:
    • $0 - $9,525: 10% → $952.50
    • $9,526 - $38,700: 12% → $3,314.40
    • $38,701 - $43,650: 22% → $1,151.10
  3. Total Tax = $952.50 + $3,314.40 + $1,151.10 = $5,418.00

This is an estimate. Actual tax may differ based on your specific situation and changes to tax laws.

Frequently Asked Questions

Is this calculator accurate for my exact tax situation?
No, this is a simplified estimate. For exact calculations, use official IRS forms or consult a tax professional.
Does this calculator include state taxes?
No, this calculator only estimates federal income tax. State taxes are calculated separately.
What if I have itemized deductions?
The calculator uses standard deductions. If you have significant itemized deductions, your actual tax may be lower.
Are there any tax credits I should know about?
Common credits like the Earned Income Tax Credit (EITC) or Child Tax Credit are not included in this estimate.
When should I file my 2018 tax return?
Tax returns for 2018 were due April 17, 2019. If you filed an extension, you had until October 15, 2019.