Budgeting a trading operation: fixed costs, income volatility, health insurance and pension contributions when self-employed

What you will learn

• How to separate the fixed costs of the operation from the fixed costs of your life and why both must be covered by volatile income.
• How statutory health insurance contributions are calculated for a self-employed trader in Germany, with the 2026 figures.
• Why traders are usually not compulsorily insured in the statutory pension and what that means for your budget.
• How to size a reserve and a required payout level from a payout history.

Explanation

Household budgeting was covered in the course Personal Finance (lesson pf02). Here the income is a stream of irregular payouts and the costs include items an employee never sees. General orientation for Germany as of 2026; figures change yearly.

Three layers of fixed costs

Operation costs: data feed, platform, software, fees, hardware replacement, bookkeeping and the Steuerberater. Social costs: health and long-term-care insurance and retirement saving; an employer pays half of these for an employee, a self-employed trader pays all. Living costs: rent, food, transport, private insurance. The operation is viable only if the median monthly payout covers all three layers after tax.

Health insurance when self-employed

A self-employed trader can stay in the statutory system as a freiwillig Versicherter (voluntary member of the gesetzliche Krankenversicherung, GKV) or choose private insurance (PKV). The GKV contribution is a percentage of total income between a floor and a cap. For 2026: general rate 14.6 percent plus the fund's Zusatzbeitrag (average 2.9 percent, varies by fund); long-term-care insurance (Pflegeversicherung) 3.6 percent plus 0.6 percent for members without children; Mindestbemessungsgrundlage (minimum assessable income) €1,318.33 per month; Beitragsbemessungsgrenze (cap) €5,812.50 per month. Contributions are set provisionally from the last tax assessment and corrected retroactively, so a good year produces a back payment one or two years later. PKV premiums depend on age and health, not income, and do not fall in a bad year.

Pension: usually voluntary, therefore your decision

Self-employed traders are not among the professions with compulsory statutory pension insurance, so nothing is deducted automatically. Options: voluntary contributions to the Deutsche Rentenversicherung (18.6 percent of a chosen amount within limits), a Basisrente ("Rürup") contract, or your own ETF portfolio (course ETFs, Funds and Long-Term Investing). Treat a fixed percentage of each payout as a non-negotiable cost line.

Taxes as a monthly cost

Income tax is paid in quarterly advance payments (10 March, June, September, December) once the Finanzamt has an estimate, with the balance after the return. Move a fixed share of every payout to a separate tax account; 25 to 35 percent is a common working range, but calculate your own rate with a Steuerberater.

Reserve and required income

Two rules of thumb: a reserve of at least six months of all three layers, because failed evaluations and payout reviews stop income for months; and a required gross payout = monthly costs ÷ (1 − tax share − retirement share), compared with the median of past payouts, not the mean.

Worked example

Hypothetical example: A trader without children, in the GKV, with no other income. Living costs: rent €950, food €400, insurance €80, phone and internet €60, transport €110, other €300. Operation costs: €150 per month for data and platform (fees are paid from the reserve). Expected profit about €3,000 per month, so the fund assesses contributions on €3,000. Tax reserve 25 percent, retirement 10 percent. Hypothetical Zusatzbeitrag 2.9 percent.

1. Living costs: 950 + 400 + 80 + 60 + 110 + 300 = €1,900.
2. Health insurance: 3,000 × (14.6% + 2.9%) = €525.00; care insurance: 3,000 × (3.6% + 0.6%) = €126.00; together €651.00. (At the minimum base the same rates would give 1,318.33 × 21.7% = €286.08; at the cap 5,812.50 × 21.7% = €1,261.31.)
3. Total monthly costs: 1,900 + 651 + 150 = €2,701.
4. Required gross payout: 2,701 ÷ (1 − 0.25 − 0.10) = 2,701 ÷ 0.65 = €4,155.38 per month.
5. Reserve target: 6 × 2,701 = €16,206.
6. Last twelve months of payouts (euros): 0, 0, 3,200, 0, 6,800, 1,500, 0, 4,100, 0, 0, 9,000, 2,600. Total €27,200; mean €2,266.67; sorted, the median is (0 + 1,500) ÷ 2 = €750.

The mean is about half the requirement and the median far below it: the operation cannot carry the household yet and needs a second income until the median approaches €4,200. Health-fund back payments and Gewerbesteuer are ignored.

Common mistake

Practice activity

On paper: a trader with one child has living costs of €1,650, operation costs of €120 and an assessed income of €2,200 per month in the GKV (rate 14.6 percent, Zusatzbeitrag 2.5 percent, care insurance 3.6 percent). She reserves 28 percent for tax and 8 percent for retirement. (a) Calculate her monthly health and care contribution. (b) Calculate the required gross payout. (c) Her median payout over 18 months is €3,300. Is the operation covering her costs?

Key takeaways

• Volatile payouts must cover operation, social and living costs; compare the required gross payout with the median, not the mean.
• In 2026 a self-employed GKV member pays about 21 to 22 percent of assessed income between €1,318.33 and €5,812.50 per month, with retroactive corrections.
• There is no automatic pension for a trader; a fixed retirement percentage of every payout is a cost line, not an option.
• Hold a six-month reserve separate from the attempts budget and a separate tax account.

Next step

The next lesson compares the legal forms available to a trader in Germany, from sole trader to UG and GmbH, and examines the Trading-GmbH idea.