Converting a sole trader into a limited liability company changes the taxpayer and the settlement rules. The conversion itself generally produces neither PIT revenue nor a transaction taxable for VAT, but that does not eliminate all charges: calculate PCC and procedural costs, and assess Article 7aa CIT when entering the Estonian CIT regime. After registration, payments to the owner also need a proper legal basis. Make the key decisions before the conversion.
The Commercial Companies Code route and two paths to a company
The conversion of a sole trader is a separate institution of the Commercial Companies Code (Kodeks spółek handlowych, the CCC), not a variant of a contribution in kind — and that distinction drives every tax consequence that follows.
The basis is Article 551 § 5 (art. 551 § 5) of the CCC, and the procedure is governed by Articles 584(1)–584(13) (art. 584(1)–584(13)) of the CCC: a conversion plan in the form of a notarial deed; annexes comprising the draft conversion statement, the draft articles of association, a valuation of assets and liabilities and financial statements prepared for the purposes of the conversion; an opinion of a statutory auditor appointed by the registry court; and finally registration of the company and removal of the sole trader from the CEIDG business register (Article 584(5) of the CCC). The conversion date is the date of registration, not the date the deed is signed or the application filed (Article 584(1) of the CCC). If the sole trader does not keep accounting books, the statements prepared for the conversion are based on a summary of the entries in the tax revenue and expense ledger (podatkowa księga przychodów i rozchodów), other registers and a physical inventory (Article 584(7) § 3 of the CCC).
The Director of the National Revenue Information Service (Dyrektor Krajowej Informacji Skarbowej, the Director of the KIS) captured the nature of the transaction in an individual tax ruling of 11 July 2025, no. 0114-KDIP1-1.4012.249.2025.2.EW: "the conversion (…) does not result in the liquidation of the business activity you carry on, but only in a change of the form in which that activity will continue to be carried on" (translation by the author).
Settle the choice between the Commercial Companies Code route and a contribution in kind of the enterprise at the outset. Both routes end in a sp. z o.o., but they differ in when the assets pass, what becomes of administrative decisions, how far succession reaches and whether the lump-sum corporate income tax (Estonian CIT) is available.
| Criterion | Conversion under the Commercial Companies Code | Contribution in kind of the enterprise to a company | Legal basis |
|---|---|---|---|
| Nature of the transaction | Change of legal form of the same enterprise | Contribution in kind in exchange for shares | Article 551 § 5 and Article 584(1) of the CCC; Article 158 of the CCC |
| Transfer of assets | By operation of law, on registration of the company | Transfer of individual assets, each in the form required for it | Article 584(1) of the CCC; Articles 55(1) and 75(1) of the Civil Code |
| Tax succession | Succession to the sole trader's rights; liabilities stay with the natural person | No general succession on a contribution to a capital company | Article 93a § 4 and § 5 of the Tax Ordinance |
| Permits and licences | The company remains their holder unless a statute or the decision provides otherwise | No general rule on the transfer of administrative decisions | Article 584(2) § 2 of the CCC |
| Examination of asset values | The plan must be examined by an auditor appointed by the court | Sp. z o.o.: no general requirement for an auditor’s opinion on the contribution. S.A.: examination of the founders’ report, subject to Article 312¹ CCC exceptions | KSH: 584⁵(1), 584⁸, 158, 175, 312, 312¹ |
| VAT | Outside the scope of the tax — neither a supply of goods nor a supply of services | Outside the scope of the Act, with the adjustment continued by the acquirer | Article 5(1)(1) and Articles 7 and 8 of the VAT Act; Article 6(1) and Article 91(9) of the VAT Act |
| Initial value | The value from the sole trader's schedule and registers, with the method and the charges carried over | Values carried over from the contributor's registers for assets recorded there | Article 16g(1)(4b) and Article 16h(3d) in conjunction with Article 16h(3) of the CIT Act; Article 16g(9) and (10a) and Article 16h(3) and (3a) of the CIT Act |
| Lump-sum corporate income tax | The list of exclusions does not mention the conversion of a sole trader | An enterprise/ZCP contribution or its assets exceeding EUR 10,000 equivalent in the creation year or the next can exclude the regime for the commencement year and the next, at least 24 months from creation; separately assess an existing recipient under paragraph 2 | CIT: 28k(1)(5)(c), 28k(2) |
| PCC | The articles of association of the converted company; the base is the share capital, the rate is 0.5% | Formation of the company and the capital increase are assessed separately; the exclusion covers an enterprise of a capital company | Article 1(1)(1)(k), Article 6(9) and Article 7(1)(9) of the PCC Act; Article 2(6) of the PCC Act |
| Liability for the past | Civil law: the individual is jointly and severally liable with the company for 3 years. Tax law: the individual’s own arrears and the company’s separate liability; no common three-year expiry | Separate civil and tax rules for the acquirer, with limits and exceptions; tax liability requires an authority’s decision | Article 584(13) of the CCC and Article 112b of the Tax Ordinance; Article 55(4) of the Civil Code and Article 112 of the Tax Ordinance |
Succession: broad under the Code, narrow under the Tax Ordinance
The company takes over all the sole trader's civil-law rights and obligations, but in tax law it succeeds only to his rights — not to his liabilities.
Under the Commercial Companies Code the company holds all the rights and obligations of the sole trader and remains the holder of permits, licences and reliefs (Article 584(2) § 1 and § 2 of the CCC). Article 93a § 4 (art. 93a § 4) of the Tax Ordinance (Ordynacja podatkowa) narrows this considerably: the company succeeds to those rights of the sole trader provided for in tax law that relate to the business carried on, except for rights that cannot be continued under the rules on the taxation of capital companies.
The authority explained the difference directly in the ruling cited above, no. 0114-KDIP1-1.4012.249.2025.2.EW: "as a result of the conversion of a sole trader who is a natural person into a single-member capital company, full tax succession does not occur, because it does not cover liabilities, only rights".
The trader’s VAT and PIT arrears remain the individual’s liabilities, alongside the company’s separate liability under Article 112b of the Tax Ordinance. Rights that cannot continue under the company’s tax regime do not pass to it; they do not automatically expire for the individual. A PIT loss, for example, cannot be deducted by the company against CIT, while further use by the trader depends on PIT rules and subsequent income. Review each permit, concession and subsidy decision under Article 584² §2 of the Commercial Companies Code and special legislation.
The sole trader's PIT position on the conversion date
The conversion itself creates no revenue, but it closes the sole trader's tax accounts and fixes values that will operate for years.
Prepare the asset inventory under Article 24(3a) and (3f) PIT at conversion and reconcile the individual’s closing accounts with the company’s opening accounts. For a tax revenue and expense ledger, separately assess stocktaking and the stock difference; the asset inventory does not replace it. On a later sale of shares, Article 22(1ł) PIT refers to tax asset values in the books, records and inventory at acquisition of the shares, capped at their value determined under Article 17(1)(9). This is not automatically the market value of the enterprise or simply the share capital. Continued depreciation in the company remains subject to CIT exclusions and limits for particular assets.
Funds generated before the conversion are a separate issue. If they are to reach the owner after the registration date, decide before that date whether they remain part of the company's capital or constitute a liability of the company to the natural person. The fact that the income was already taxed under PIT does not exempt the later payment out of the company — what governs is the legal title to the payment, not the description on the transfer or the analytics of the supplementary capital account.
CIT in the company: initial value, depreciation, losses
The company carries over the sole trader's tax values, but it does not take over his loss and it does not step the assets up to market value.
Article 15(1w) CIT refers to the asset inventory on conversion. On a later sale, Article 15(1x) distinguishes fixed assets and intangibles (initial value under Article 16g(1)(4b), less depreciation) from other assets (purchase or production expenditure not previously deducted). Article 16h(3d), read with paragraph 3, governs continuation of the method and deductions. The company cannot deduct the trader’s PIT loss. The 9% rate restriction covers the tax year in which the company starts business and the following tax year (Article 19(1a)(2)).
The carry-over also extends to items accounted for over time. In an individual tax ruling of the Director of the KIS of 30 May 2025, no. 0114-KDIP2-2.4010.169.2025.1.RK/AS, the authority held that "the converted company may include in its tax-deductible costs (…) costs/expenses incurred by the sole trader (…) before the conversion date, recorded in that sole trader's accounting registers, but which fall to be accounted for (deducted) as a tax-deductible cost for corporate income tax purposes only after the conversion date".
Agree a single schedule of accounting, tax and register values with the accounting team before the plan is drawn up — a discrepancy that surfaces after registration means correcting the tax accounts of both parties.
VAT and the transition around the registration date
The conversion itself is not a sale of the enterprise. During the transition, invoices, returns and authorisations must nevertheless be assigned correctly to the individual or the company.
For the CCC conversion described in ruling 0114-KDIP1-1.4012.249.2025.2.EW, the authority found no taxable supply, no cessation requiring an inventory under Article 14(5), and no Article 90a or 91 adjustment arising merely from the change of legal form. This does not remove adjustments triggered by other events, such as a change in an asset’s use, or ongoing adjustment duties. Separately assess asset withdrawals before conversion, changed use and additional transactions. Do not extend the conclusion about conversion itself to an entire project without examining its transactions.
The problem lies elsewhere. The company receives its own tax identification number (NIP), so from the registration date it documents sales under its own details, while earlier events have to be classified by the date of the transaction and by the entity that carried it out. Purchase invoices must identify the actual purchaser; an error in naming a party to the transaction is corrected by the issuer by way of a corrective invoice (Article 106j of the VAT Act) — Article 106k, on corrective notes, has been repealed as at the state of the law adopted here. Before the registration date, prepare the VAT-R and NIP-8 filings, the bank accounts together with their notification to the white list of VAT taxpayers, the cash registers, the authorisations in KSeF (the National e-Invoicing System) and the UPL-1 and PPS-1 powers of attorney.
PCC on the articles of association of the converted company
The absence of current revenue from the conversion itself does not remove PCC: the new company’s formation document must be assessed under the relevant rules. Any obligations on choosing Estonian CIT are assessed separately.
In a typical conversion of a sole trader into a Polish sp. z o.o., PCC applies to the resulting company agreement (Article 1(1)(1)(k)). Check territorial scope under Article 1(5) and any exclusions or exemptions. The base is share capital after Article 6(9) deductions, taxed at 0.5% under Article 7(1)(9). Asset value allocated to supplementary capital does not increase that base. The notary collects the tax for a notarial deed (Article 10(2)). A PSA falls outside the Article 1a(2) PCC definition of a capital company: its agreement and amendments are not subject to PCC as a company agreement. Its other transactions require separate assessment.
The amount of the share capital is therefore a decision with a tax dimension, taken when the draft articles of association are prepared. Budget for PCC alongside the notarial fee, the court fees and the auditor's remuneration.
Estonian CIT: the dispute over the status of a taxpayer starting business activity
When choosing Estonian CIT, distinguish the statutory entry and rate conditions from protection under a ruling. The decisions below illustrate a dispute over start-up status. A taxpayer’s own ruling does not create an entitlement to a preference, but may provide protection within its addressee, facts and applicable law.
Article 28j(2) CIT treats the revenue-composition condition as satisfied for a taxpayer commencing business in its first lump-sum year. The employment condition does not apply in the commencement year and the next two tax years, but from year two employment must increase each year by at least one full-time post until the required level is reached. Article 28o(1)(1) sets 10% for small taxpayers and taxpayers commencing business. Article 28k(1) does not list the conversion of a sole trader into a capital company itself; all other conditions still need to be met.
Two rulings from the same day illustrate divergent practice and the significance of earlier judgments in the individual case. In an individual tax ruling of the Director of the KIS of 16 June 2025, no. 0111-KDIB1-3.4010.302.2025.1.ZK, the authority held the taxpayer's position to be incorrect: "a sp. z o.o. that has arisen from the conversion of a sole trader's business is not a taxpayer starting business activity. Accordingly, Article 28j(2) will not apply to your Company". The same authority decided the opposite way in a ruling of 16 June 2025, no. 0111-KDIB1-2.4010.591.2023.11.MK, issued following the judgment of the Provincial Administrative Court in Wrocław (Wojewódzki Sąd Administracyjny) of 4 July 2024, case ref. I SA/Wr 105/24, and the judgment of the Supreme Administrative Court (Naczelny Sąd Administracyjny) of 11 March 2025, case ref. II FSK 1412/24, dismissing the authority's cassation appeal: "I take into account the legal assessment and the procedural directions expressed by the Provincial Administrative Court in Wrocław and by the Supreme Administrative Court (…); I find that the position you presented in the application is correct". The argument underlying that line is that a sole trader does not carry on business activity within the meaning of the CIT Act, and that carrying it on in that sense begins only on the conversion date.
Small taxpayer status is a separate basis for the 10% rate. However, ruling 0111-KDIB1-3.4010.656.2025.2.AN of 8 December 2025 concerned a specific sequence: conversion in October 2023, ordinary CIT until the end of 2023 and entry into the lump-sum regime in January 2024. The authority assessed the company’s sales including VAT in its previous tax year, from 31 October to 31 December 2023. This does not automatically establish small taxpayer status for every company electing the regime on its conversion date.
Check all entry conditions in Article 28j, exclusions in Article 28k and the rate basis in Article 28o CIT separately. The absence of sole-trader conversion from the exclusion list is not sufficient. For small taxpayer status, identify the relevant previous tax year and sales including VAT; separately assess the relaxed employment condition in Article 28j(3). If relying on disputed start-up status, plan a ruling request sufficiently early. Filing it does not extend the ZAW-RD deadline, generally the end of the first month of the first lump-sum tax year. Also assess the initial adjustment and conversion income under Article 7aa, particularly paragraph 2(3) and paragraphs 8–9: prior records, accounting and tax values, and whether the first post-conversion year is also the first lump-sum year. These obligations are separate from choosing the 10% or 20% rate.
Liability for obligations arising before the conversion
Moving into a company does not end the sole trader's personal liability for the past — it only changes who is liable for obligations arising after the registration date.
The natural person is jointly and severally liable with the company for obligations connected with the business carried on that arose before the conversion date, for three years from that date (Article 584(13) of the CCC). In parallel, the company is liable with all its assets, jointly and severally with the natural person, for the sole trader's tax arrears that arose up to the conversion date (Article 112b of the Tax Ordinance), and the tax authority rules on third-party liability by way of a decision (Article 108 § 1 of the Tax Ordinance). The three-year period in the Commercial Companies Code concerns the civil-law regime described here; it is not the expiry period for the individual’s own tax arrears or the company’s tax liability.
The two regimes run in opposite directions and both have to be taken into account. Describe the items still open as at the registration date — disputed invoices, audits in progress, JPK corrections — and assign each of them to a specific party before the conversion.
The most common mistake
The most common mistake is to begin the notarial and registration steps before deciding what happens to the leases, loans, grants, permits and account numbers — on the assumption that everything passes automatically.
Article 584²(1)–(2) CCC provides for continuity of rights, obligations and licences, subject to statutory or decision-specific exceptions. Check leases, loans, factoring and funding agreements for notices, consents and change-of-control or legal-form clauses. Arrange reporting of company accounts and check their appearance in the VAT taxpayer list before planned payments. There is no separate universal statutory deadline of “before the first transfer”: reporting duties and payment consequences depend on the applicable rules and the type and value of the transaction.
Before the plan is signed, build a matrix of contracts and decisions in four categories: continuing with no action, requiring notification, requiring consent, requiring an amendment. Assign a deadline and an owner to each item, and assemble the documents on which consent depends before the KRS application is filed.
Summary
- Prepare the inventory and reconcile tax values with the books and records. Separately determine the company’s initial asset values and the cost and cap under Article 22(1ł) PIT on a later share sale.
- Assume that tax succession covers rights and not liabilities, and assign the items still open from before the registration date to the natural person.
- Decide the status of funds generated before the conversion and document the legal title to every later payment.
- For Estonian CIT, check every entry condition and the rate basis, including the correct previous year for small taxpayer status. If relying on disputed commencement status, plan a ruling request early; it does not extend the ZAW-RD deadline.
- Close out the review of contracts, administrative decisions, bank accounts and system authorisations before the date of registration.
Sources cited
All quotations from Polish-language sources — statutes, tax rulings and court judgments — are given here in the author's translation; the Polish wording is authoritative.
- Individual tax ruling of the Director of the National Revenue Information Service of 16 June 2025, no. 0111-KDIB1-2.4010.591.2023.11.MK — a sp. z o.o. arising from the conversion of a sole trader's business as a taxpayer starting business activity within the meaning of Article 28j(2) of the CIT Act; the taxpayer's position held to be correct. The ruling was issued following a court judgment; the authority dispensed with the legal reasoning for its assessment under Article 14c § 1 of the Tax Ordinance, so the passage quoted comes from the part of the document giving effect to the judgments. Date of issue per the document metadata: 16 June 2025; date of publication: 26 June 2025. https://eureka.mf.gov.pl/informacje/podglad/644477
- Individual tax ruling of the Director of the National Revenue Information Service of 16 June 2025, no. 0111-KDIB1-3.4010.302.2025.1.ZK — the opposite position: a company arising from a conversion is not a taxpayer starting business activity; the taxpayer's position held to be incorrect. https://eureka.mf.gov.pl/informacje/podglad/644090
- Individual tax ruling of the Director of the National Revenue Information Service of 11 July 2025, no. 0114-KDIP1-1.4012.249.2025.2.EW — no VAT on the conversion, no physical inventory under Article 14(5) of the VAT Act, no input tax adjustment, and the scope of succession under Article 93a § 4 of the Tax Ordinance. https://eureka.mf.gov.pl/informacje/podglad/648323
- Individual tax ruling of the Director of the National Revenue Information Service of 30 May 2025, no. 0114-KDIP2-2.4010.169.2025.1.RK/AS — deduction in the company of costs incurred by the sole trader before the conversion date, and the value of assets under Article 15(1w) and (1x) of the CIT Act. https://eureka.mf.gov.pl/informacje/podglad/643018
- Individual tax ruling of the Director of the National Revenue Information Service of 8 December 2025, no. 0111-KDIB1-3.4010.656.2025.2.AN — the 10% lump-sum rate for a company arising from a conversion, based on small taxpayer status under Article 4a(10) of the CIT Act. https://eureka.mf.gov.pl/informacje/podglad/670684
- Judgment of the Supreme Administrative Court of 11 March 2025, case ref. II FSK 1412/24 — dismissal of the cassation appeal of the Director of the KIS against the judgment setting aside the ruling on the status of a taxpayer starting business activity. The case reference, the date and the content of the decision are confirmed in the document of ruling no. 0111-KDIB1-2.4010.591.2023.11.MK, which gives effect to that judgment.
- Judgment of the Provincial Administrative Court in Wrocław of 4 July 2024, case ref. I SA/Wr 105/24 — setting aside ruling no. 0111-KDIB1-2.4010.591.2023.1.MK. The case reference and the date are confirmed in the document of ruling no. 0111-KDIB1-2.4010.591.2023.11.MK.
Source use: rulings 644477 and 648323 were checked in official EUREKA exports. For 644090, 643018 and 670684, cited passages were compared with reproductions of the full documents; a fresh official download was unavailable. Dates and outcomes of I SA/Wr 105/24 and II FSK 1412/24 are reported through ruling 644477, without claiming a separate review of the full judgments.
Current statutory texts: KSH CIT PIT VAT PCC NIP
E-book reference
A full account of the procedure for converting a sole trader — together with a list of documents, a working timetable around the registration date, a schedule of tax values and a comparison with a contribution in kind and a sale of the business — is set out in the e-book JDG → spółka z o.o. Procedura, podatki i pierwsze rozliczenia (Sole trader to sp. z o.o.: procedure, taxes and first settlements; Zbyszko Pora, JTWPOLAND) from the Biblioteka Restrukturyzacji series. The PDF is available free of charge in the e-book section; the publication is available in all five languages of the portal.
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Get in touch →Legal basis: Act of 15 September 2000 — Commercial Companies Code (Dz.U. z 2024 r. poz. 18, as amended): Article 551 § 5, Articles 584(1)–584(13), in particular Articles 584(2), 584(5), 584(6), 584(7) § 3, 584(8), 584(12) and 584(13); Articles 158, 175 and 312.; Act of 29 August 1997 — Tax Ordinance (Dz.U. z 2026 r. poz. 622, as amended): Article 93a § 4 and § 5, Article 93e, Article 108 § 1, Articles 112 and 112b, Article 14b et seq., Article 119a et seq.; Act of 15 February 1992 on corporate income tax (Dz.U. z 2026 r. poz. 554, as amended): Article 4a(10), Article 7(3)(4), Article 7aa, Article 15(1w) and (1x), Article 15(4)–(4e), Article 16g(1)(4b), Article 16g(9) and (10a), Article 16h(3), (3a) and (3d), Article 19(1a)(2), Articles 28j, 28k and 28o.; Act of 26 July 1991 on personal income tax (Dz.U. z 2026 r. poz. 592, as amended): Article 22(1ł), Article 24(3f), Article 24(5), Article 30a(1)(4), Article 30b.; Act of 11 March 2004 on the tax on goods and services (Dz.U. z 2026 r. poz. 1263): Article 5(1)(1), Article 6(1), Articles 7 and 8, Article 14(5), Articles 90a and 91, Article 96, Articles 106e and 106j.; Act of 9 September 2000 on the tax on civil law transactions (Dz.U. z 2026 r. poz. 191): Article 1(1)(1)(k), Article 1a(2), Article 2(6), Article 6(1)(8)(a) and Article 6(9), Article 7(1)(9).; Act of 23 April 1964 — Civil Code (Dz.U. z 2026 r. poz. 795): Articles 55(1), 55(4) and 75(1).; Act of 29 September 1994 on accounting (Dz.U. z 2026 r. poz. 522, as amended): Article 2, Article 10, Article 12(1) and (2).; KSH: 312¹; PIT: 17(1)(9), 24(3a); PCC: 1(5), 10(2); NIP: 5, 12 (Dz.U. 2026, poz. 151 ze zm.).