Calculator Comparison

Quarterly Tax Calculator vs Self-Employment Tax Calculator

Not sure which calculator to use? Here's a side-by-side comparison of the Quarterly Tax Calculator and Self-Employment Tax Calculator to help you pick the right one for your needs.

Quarterly Tax Calculator

Tax Planning

Calculate estimated quarterly tax payments for self-employed individuals and those with income not subject to withholding.

What you enter

Expected Annual Income
Self-Employment Income
Filing Status
Tax Already Withheld (YTD)
Prior Year Total Tax
Estimated Deductions

What you get

Quarterly Payment Due(primary)
Estimated Annual Tax
Safe Harbor Payment
Total Remaining (3 quarters)

Includes visual bar chart breakdown

Use Quarterly Tax Calculator

Self-Employment Tax Calculator

Tax

Calculate your self-employment tax (Social Security and Medicare) as a freelancer, contractor, or small business owner.

What you enter

Net Self-Employment Income
Other W-2 Income
Filing Status

What you get

Self-Employment Tax(primary)
Social Security (12.4%)
Medicare (2.9%)
Deductible Portion (50%)

Use Self-Employment Tax Calculator

Key Differences

Feature	Quarterly Tax Calculator	Self-Employment Tax Calculator
Category	Tax Planning	Tax
Inputs	6 required fields	3 required fields
Outputs	4 results	4 results
Chart	bar chart	No chart
FAQs	3 answered	3 answered

Input Comparison

Shared Inputs

Filing Status

Only in Quarterly Tax Calculator

Expected Annual Income
Self-Employment Income
Tax Already Withheld (YTD)
Prior Year Total Tax
Estimated Deductions

Only in Self-Employment Tax Calculator

Net Self-Employment Income
Other W-2 Income

Which Calculator Should You Use?

Use the Quarterly Tax Calculator if you need to:

Calculate quarterly payment due
When you know your expected annual income and self-employment income
Want a visual bar chart breakdown

Use the Self-Employment Tax Calculator if you need to:

Calculate self-employment tax
When you know your net self-employment income and other w-2 income

Frequently Asked Questions

When are quarterly taxes due?

Quarterly estimated taxes are due April 15 (Q1), June 15 (Q2), September 15 (Q3), and January 15 of the following year (Q4). If the date falls on a weekend or holiday, the deadline is the next business day. Missing deadlines triggers underpayment penalties.

What is the safe harbor rule?

The safe harbor rule protects you from underpayment penalties if you pay either 90% of current year tax or 100% of prior year tax (110% if AGI exceeds $150k). Many self-employed people use the prior year method for predictability, then settle up at tax time.

What is self-employment tax?

Self-employment tax is 15.3% (12.4% Social Security + 2.9% Medicare) applied to 92.35% of your net self-employment income. It's the self-employed equivalent of FICA taxes that employers normally split.

Can I deduct self-employment tax?

Yes, you can deduct 50% of your self-employment tax on your Form 1040 as an adjustment to income. This reduces your adjusted gross income, lowering your overall income tax.

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Bottom Line

Choose the Quarterly Tax Calculator if you need to calculate quarterly payment due. Use the Self-Employment Tax Calculator if you need to calculate self-employment tax. Both calculators are free and require no sign-up.

Use Quarterly Tax Calculator Use Self-Employment Tax Calculator

Feature