2015 Federal Withholding Calculator

How Federal Withholding Works

Federal income tax withholding is the amount of tax the IRS deducts from your paycheck before you receive it. The amount withheld is based on your annual salary and the number of allowances you claim.

In 2015, the IRS used a progressive tax bracket system where different portions of your income were taxed at different rates. The standard deduction for single filers was $6,300, and married filing jointly filers could claim $12,600.

How to Use This Calculator

Enter your annual salary and select your filing status. The calculator will show you the monthly withholding amount and your estimated take-home pay.

The calculator assumes you claim the standard deduction and no other adjustments. For more precise results, you may need to consult a tax professional.

Formula and Assumptions

The federal withholding amount is calculated using the following steps:

1. Calculate the annual taxable income by subtracting the standard deduction from your annual salary
2. Apply the progressive tax brackets to determine the annual tax liability
3. Divide the annual tax liability by 12 to get the monthly withholding amount

Assumptions:

• No additional deductions or credits beyond the standard deduction
• No state or local taxes
• No changes to tax brackets or deductions during the year

Worked Example

Let's calculate the withholding for a single filer with an annual salary of $50,000.

1. Annual salary: $50,000
2. Standard deduction: $6,300
3. Taxable income: $50,000 - $6,300 = $43,700
4. Tax bracket: 10% on first $9,225, 15% on next $23,450, 25% on next $14,250, 28% on next $14,250, and 33% on remaining $5,950
5. Annual tax: ($9,225 × 0.10) + ($23,450 × 0.15) + ($14,250 × 0.25) + ($14,250 × 0.28) + ($5,950 × 0.33) = $11,528.75
6. Monthly withholding: $11,528.75 / 12 = $960.73

Your take-home pay would be approximately $50,000 - $960.73 × 12 = $41,071.28.