How to Estimate Self-Employment Tax and Set Money Aside

The bill that catches new freelancers is not income tax — it is the self-employment tax on top of it. Employees never see it because their employer pays half; when you work for yourself, you pay both halves.

What the Self-Employment Tax does

Calculates self-employment tax at 15.3% — which is 12.4% social security plus 2.9% Medicare, both halves — and applies the standard 92.35% adjustment to net profit before the rate.

That 92.35% exists because you are allowed to exclude the employer-equivalent portion from the base. It is not a rounding; it is written into the calculation.

Open the Self-Employment Tax and follow the settings and checks below.

Rates and method

Setting	What it means
SE tax rate	15.3% — default
Made up of	12.4% social security + 2.9% Medicare
Applied to	92.35% of net profit, not 100%
Why 92.35%	Excludes the employer-equivalent half from the base
Net profit	Revenue minus allowable expenses
Default revenue / expenses	80,000 / 15,000
Income tax	Separate — enter your rate, default 22%
Knows your country’s rules?	No

How to use it

1. Enter revenue and allowable expenses — the tax is on profit, not turnover.
2. Check the SE rate against current rules.
3. Add your income tax rate to see the combined burden.

Practical advice

Set aside a percentage of every payment as it arrives, not at year end. Between self-employment tax and income tax, 25–30% of profit is a common holding figure — and the freelancers who get into trouble are almost never the ones who earned too little, but the ones who spent money that was never theirs.

Common questions

Why 92.35% and not the full profit?

Because you may exclude the employer-equivalent portion of the tax from the base it is calculated on — employees are not taxed on their employer’s half either. The 7.65% reduction is what makes the treatment comparable.

Why is the rate 15.3% when employees pay 7.65%?

Employees pay half and their employer pays the other half. Self-employed people are both, so they pay both halves. This is the single biggest surprise in a first year of freelancing.

Is this the same as income tax?

No, and it is in addition to it. Self-employment tax funds social security and Medicare; income tax is separate and applies to the same profit. The tool shows both so the combined figure is visible.

Does this apply outside the US?

The 15.3% structure is US-specific. Most countries have an equivalent self-employed social contribution with different rates and thresholds. Change the rate to your own, and check with a local accountant — this knows no jurisdiction.

Useful next tools

• Income Tax Estimator — Rough tax due or refund on a year's income.
• Hourly Rate Calculator — The rate you must charge to hit your income target.
• Take-Home Pay — Estimate net pay from gross salary.
• Invoice Generator — Build a clean invoice with line items and export a PDF.
• Profit Margin — Margin, markup and selling price from cost.
• 50/30/20 Budget Calculator — Split take-home pay into needs, wants and savings.

Vootkit provides general educational calculations, not tax, accounting, legal or payroll advice. Rates, thresholds, allowances and filing rules vary by country and can change. Verify current figures with the relevant tax authority or a qualified professional.