Converting a Sole Proprietorship to a GmbH in Germany 2026

Your sole proprietorship is doing well, profits are rising — and so are your tax bill and your personal liability. At some point the question comes up: is it worth switching to a GmbH? The good news: you can convert your existing Einzelunternehmen into a GmbH without starting from scratch — and, under certain conditions, even tax-neutrally.

"Converting" is the everyday term. Legally, you transfer your business to a new GmbH — either by spinning it off under the German Transformation Act (Umwandlungsgesetz) or by contributing it in kind. Which route fits depends mainly on whether your sole proprietorship is entered in the commercial register (Handelsregister).

This guide shows you when the move is worth it, the three available routes, how § 20 UmwStG lets you avoid taxing hidden reserves, and what to watch for with share capital, the notary and your bookkeeping.

When converting to a GmbH pays off

The switch is not an end in itself — it tends to pay off in these situations:

• Liability: As a sole proprietor you are personally liable without limit. The GmbH limits liability to the company's assets.
• Tax on high profits: A GmbH taxes retained profits at roughly 15% corporate income tax plus solidarity surcharge plus trade tax — together around 30% depending on the municipal rate. A sole proprietorship is taxed at your personal income tax rate of up to 42% (45% top rate).
• Reinvestment: If you leave profits in the company instead of withdrawing them, you benefit from the lower corporate rate.
• Credibility and investors: Banks, large clients and investors often take the GmbH form more seriously — and shares are easier to transfer.

Rule of thumb: once you have a consistently high five-figure annual profit that you don't fully spend privately, a GmbH starts to make sense tax-wise. Still, run the exact numbers with your tax advisor or in Norman — the conversion has costs that only amortize over the years.

Three routes: spin-off, contribution in kind, or cash formation

There isn't one path but three:

• Spin-off under the Transformation Act (§ 152 ff. UmwG): Only possible if your business is registered as a registered merchant (eingetragener Kaufmann, e.K.) in the commercial register. The advantage: contracts, accounts and employees pass to the GmbH automatically by universal succession — you don't have to ask each counterparty individually.
• Contribution in kind (Sachgründung): The standard route for sole proprietors not in the register. You form a new GmbH and contribute your business as a contribution in kind. Each asset and contract is transferred individually (singular succession), and key contracts need the other side's consent.
• Cash formation plus sale: You form the GmbH the classic way with €25,000 in cash, then sell your business assets to it. Easier to value, but it can immediately expose hidden reserves to tax.

Tax-neutral thanks to § 20 UmwStG

The key lever: if you contribute your entire business in exchange for new shares, § 20 UmwStG lets you carry forward the book values. The hidden reserves — the value above the book value of your fixed assets, client base and goodwill — are then not taxed immediately.

Two things to keep in mind:

• Seven-year lock-up (§ 22 UmwStG): If you sell the GmbH shares within seven years, the contribution gain is taxed retroactively — reduced by one-seventh for each full year that has passed.
• Retroactivity up to 8 months: The contribution can be backdated for tax purposes to a reference date up to eight months in the past, for example to an existing year-end balance sheet.

Watch out for property: if real estate is part of the business, the transfer can trigger real estate transfer tax (Grunderwerbsteuer).

Share capital and the contribution-in-kind report

A GmbH needs share capital of €25,000. With a contribution in kind, the value of your contributed business counts toward this capital — so you don't have to pay in extra cash, provided the business is worth enough.

In return, the registry court requires a Sachgründungsbericht (contribution-in-kind report) proving the value of the contribution. If the business is worth less than the share capital claimed, you are liable for the difference (Differenzhaftung). A clean valuation of your fixed assets and a look at the opening balance sheet are decisive here.

Step by step

1. Inventory & valuation: Closing balance sheet of the sole proprietorship; value fixed assets, inventory and goodwill.
2. Choose the route: Spin-off (e.K. only), contribution in kind, or cash formation.
3. Notary appointment: Articles of association, contribution-in-kind report if applicable, notarization.
4. Commercial register: Registration and entry of the GmbH.
5. Opening balance sheet: The GmbH prepares its opening balance sheet as of the transfer date.
6. Organize the handover: Move contracts, business account, insurance and ongoing obligations to the GmbH; re-register your trade.

The GmbH formation itself runs like any new formation — except your contribution is your existing business rather than cash. If you're coming from a UG instead of a sole proprietorship, the path is different: see converting a UG into a GmbH.

What changes in your bookkeeping

The biggest operational jump: as a sole proprietor you could often use the simple cash-basis income statement (EÜR). A GmbH is always required to keep double-entry bookkeeping with a balance sheet, profit-and-loss statement, annual accounts and publication in the Federal Gazette — from day one.

That means more obligations, but with the right software no slowdown. Norman's AI bookkeeping captures receipts automatically, posts them under the SKR03/04 chart of accounts and prepares your VAT returns and annual accounts — built for the new GmbH structure.

Conclusion

Converting a sole proprietorship into a GmbH is very doable — and thanks to § 20 UmwStG even without an immediate tax hit, as long as you contribute the whole business for shares and keep the seven-year period. What matters is choosing the right route (spin-off, contribution in kind, or cash formation), a clean valuation for the share capital, and the switch to double-entry bookkeeping. Run the tax advantage carefully beforehand — then the move becomes a real growth step rather than an expensive end in itself.