The legal form of a business in 2026 – what to actually compare before choosing

An entrepreneur choosing a legal form usually compares rates: 12% and 32%, 19%, 9%. Such a comparison is misleading, because it leaves out the owner’s contributions, the tax on the distribution of profit and administration costs. Using a single hypothetical example – a result of PLN 400,000, one owner, full distribution of profit – we calculate, from the same amount, the figures for a sole trader (jednoosobowa działalność gospodarcza, JDG) under the tax scale and under the flat tax. We do the same for a spółka z ograniczoną odpowiedzialnością (sp. z o.o.), the Polish limited liability company, under standard CIT and under lump-sum corporate income tax (ryczałt od dochodów spółek, “Estonian CIT”). We also explain when a given option is available and what, apart from taxes, may tip the balance.

One base and the full burden

You will compare legal forms reliably only if you calculate each option from the same amount and add all the levies charged on the way to the owner.

The base is the result before tax and before the owner’s contributions. For a sole trader, that result bears PIT under the tax scale or the 19% flat tax (Article 30c(1) of the PIT Act (ustawa o PIT)), as well as social security contributions and the health contribution. In a sp. z o.o., two levels of tax apply: CIT (Article 19(1) of the CIT Act (ustawa o CIT)) and 19% PIT on dividends (Article 30a(1)(4) of the PIT Act), and on top of that the sole shareholder’s contributions.

The Minister of Finance (Minister Finansów) also calculates on this basis in the tax explanatory notes of 23 December 2021 on the lump-sum corporate income tax, in example 50: “The total burden of CIT and PIT on the company’s net profits paid to Ms X amounts to PLN 80,000, which represents 20% of the net profits attributable to her” (translation by the author).

Assumptions of the example: revenue of about PLN 2,000,000 a year, a tax result equal to the accounting result, and no other income or reliefs. The business employs, under employment contracts, at least 3 persons who are not shareholders, in full-time equivalents, and their remuneration is charged against the result equally in each form. The company is a small taxpayer, falls within the revenue limit for the 9% rate and is not subject to the waiting period under Article 19(1a) of the CIT Act. The owner pays full social security contributions, including voluntary sickness insurance, for 12 months, without any preferential treatment. In the company the owner draws no remuneration and receives the whole profit as a dividend. When doing your own calculation, change the assumptions one at a time.

Sole trader – tax scale or flat tax

For a sole trader, the tax and the health contribution depend on the same income; at a result of PLN 400,000, the flat tax produces a burden PLN 39,525 lower than the tax scale.

You deduct the social security contributions you pay for yourself from income under the tax scale (Article 26(1)(2)(a) of the PIT Act) and under the flat tax (Article 30c(2)(1)). In 2026 they are calculated on an assessment base of PLN 5,652 and, together with the contribution to the Labour Fund and the Solidarity Fund (Fundusz Pracy i Fundusz Solidarnościowy, FP and FS), amount to PLN 1,926.76 a month. In the example we treat the FP and FS contribution as a business cost (Article 22(1) of the PIT Act); otherwise the burden would rise by PLN 682 under the tax scale and by PLN 397 under the flat tax.

The health contribution is 9% of income under the tax scale and 4.9% under the flat tax. According to the Social Insurance Institution (Zakład Ubezpieczeń Społecznych, ZUS), its base is reduced by social security contributions not treated as tax-deductible costs. Under the tax scale the health contribution does not reduce the tax, while under the flat tax it reduces income by no more than PLN 14,100 a year (Article 30c(2)(2)).

In a ruling of 15 June 2026, no. 0112-KDIL2-2.4011.446.2026.2.MG, the Director of the National Revenue Information Service (Dyrektor Krajowej Informacji Skarbowej, the Director of the KIS) stated that “the deduction of social security contributions and health insurance contributions – to the extent provided for by the provisions in force in a given tax year – in the PIT-36L return is the taxpayer’s entitlement, not the taxpayer’s obligation”. Use this entitlement up to the full limit: in the example it reduces the tax by PLN 14,100 × 19% = PLN 2,679.

If you remain a sole trader, recalculate both forms of taxation before making your choice for the following year.

The sp. z o.o. – CIT, the dividend and the sole shareholder’s contributions

In a sp. z o.o. you pay tax twice – in the company and on the dividend – and the sole shareholder’s contributions are also due when the company pays out nothing.

The 9% rate covers revenue other than from capital gains where the revenue for the tax year has not exceeded the equivalent of EUR 2,000,000 (Article 19(1)(2) of the CIT Act) and the taxpayer is a small taxpayer (Article 19(1d) in conjunction with Article 4a(10)). In 2026 the limits are PLN 8,431,000 for the year’s revenue and PLN 8,517,000 for the status, which is calculated on sales including VAT for the previous year. In the year in which business activity starts, the status condition does not apply (Article 19(1e)).

However, a taxpayer formed through the conversion of a sole trader, or through the contribution of an enterprise or its components worth more than EUR 10,000, does not apply the 9% rate in the year in which it starts business activity or in the following year (Article 19(1a)(2), (3) and (5)). A ruling of 23 January 2025, no. 0111-KDIB1-2.4010.697.2024.2.ANK, concerned a company to which an organised part of an enterprise (zorganizowana część przedsiębiorstwa) from a sole trader’s business had been contributed. In it, the Director of the KIS pointed to “Article 19(1a)(5) of the CIT Act, which establishes a two-year waiting period for applying the preferential tax rate”. A company whose first tax year ran from August 2023 to the end of 2024 applies the 9% rate only from 2026. The authority may argue that the waiting period covers every company that takes over a sole trader’s business. The provision, however, links it to the manner in which the company was formed and to the contributions made towards its capital. Establish both facts and a two-year revenue forecast before you include the 9% rate in your business plan; until then, calculate the option with 19% CIT.

Under Article 8(6) of the Social Insurance System Act (ustawa o systemie ubezpieczeń społecznych), the sole shareholder is, for ZUS purposes, a person carrying on non-agricultural activity (osoba prowadząca pozarolniczą działalność). The shareholder pays social security contributions on an assessment base of at least PLN 5,652 and a health contribution of PLN 830.58 a month from each company (Article 81(2za) of the Health Care Services Act (ustawa o świadczeniach opieki zdrowotnej finansowanych ze środków publicznych)). These contributions cannot be deducted from the dividend, because Article 26(1) of the PIT Act does not apply to income taxed under Articles 29–30cb. Annually this amounts to (PLN 1,926.76 + PLN 830.58) × 12 = PLN 33,088.

Estonian CIT – a lower figure only once the conditions are met

The lump-sum corporate income tax reduces the taxes on distributed profit to about 18.18% of the result before tax, but a single-shareholder company without employees cannot, as a rule, elect it.

The company pays the lump-sum tax on net profit earmarked for distribution: 10% as a small taxpayer or a taxpayer starting business activity, and 20% in other cases (Article 28o(1) of the CIT Act). The shareholder’s PIT (19%) is reduced by 90% or 70% of the lump-sum tax attributable to the shareholder (Article 30a(19) of the PIT Act). According to the explanatory notes of the Ministry of Finance (Ministerstwo Finansów, MF), this gives 20% or 25% of the distributed net profit. However, the company pays the lump-sum tax on top of the dividend, so in relation to the result before tax this is about 18.18% or 20.83%.

The conditions are listed in Article 28j(1) of the CIT Act. Under point 4, only natural persons may be shareholders, and the lump-sum tax may also be elected by, among others, a limited partnership (spółka komandytowa) and a limited joint-stock partnership (spółka komandytowo-akcyjna). The company must employ, under employment contracts, at least 3 persons in full-time equivalents “who are not shareholders, stockholders or partners of that taxpayer”, for at least 300 days in the tax year (point 3(a)). The alternative is monthly expenditure of at least three times the average wage in the enterprise sector on the remuneration of 3 such persons under other contracts, where the company is the remitter of their PIT or contributions (point (b)). The employment condition does not apply to a taxpayer starting business activity in the year it starts and in the 2 following years, but from the second year onwards it must add at least 1 full-time position every year (Article 28j(2)).

The authority may argue that the company started business activity earlier than it assumed. In a ruling of 7 May 2025, no. 0111-KDIB1-2.4010.139.2025.2.END, the Director of the KIS held that “the day on which business activity starts is to be identified with the day on which the taxpayer came into existence, i.e., the conclusion of the articles of association of the sp. z o.o.”. The Director found a notification electing the lump-sum regime (ZAW-RD) filed after the deadline calculated from that date to be ineffective. The authorities and the courts have ruled divergently on whether a company formed by the conversion of a sole trader starts business activity – see Converting a sole trader into a sp. z o.o. — what actually happens to the tax position.

On 22 and 29 September 2026 the Council of Ministers (Rada Ministrów) adopted bills amending the PIT, CIT and Lump-Sum Income Tax Acts (ustawy o PIT, CIT i ryczałcie). The bills cover Estonian CIT, the rules for a small taxpayer and for a taxpayer starting business activity, and – according to press reports – the tax scale. Planned entry into force: 1 January 2027; until the acts are passed and promulgated, the provisions described above apply. Include Estonian CIT in your calculation only if the company meets the conditions from the first lump-sum tax year and you file the ZAW-RD by the end of that year’s first month (Article 28j(1)(7)).

Outcome of the comparison at PLN 400,000

The burden of the options differs by PLN 64,833 a year, and the ranking is decided by the contributions and the tax on distribution, not by the tax rate in the business alone.

Total burden at a result of PLN 400,000 and full distribution of profit in 2026 (hypothetical example)

Method: for a sole trader, the base for PIT and the health contribution is PLN 400,000 − PLN 1,926.76 × 12 = PLN 376,878.88. Tax scale: PLN 120,000 × 12% − PLN 3,600 + (PLN 376,879 − PLN 120,000) × 32% = PLN 93,001; health contribution PLN 376,878.88 × 9% = PLN 33,919. Flat tax: health contribution PLN 376,878.88 × 4.9% = PLN 18,467; tax (PLN 376,878.88 − PLN 14,100) × 19% = PLN 68,928. Company: CIT PLN 400,000 × 9% = PLN 36,000 and PIT PLN 364,000 × 19% = PLN 69,160; with 19% CIT – PLN 76,000 and PLN 324,000 × 19% = PLN 61,560. Estonian CIT: net profit PLN 400,000 / 1.1 = PLN 363,636, lump-sum tax PLN 400,000 − PLN 363,636 = PLN 36,364, PIT PLN 363,636 × 19% − PLN 36,364 × 90% = PLN 69,091 − PLN 32,728 = PLN 36,363. Shareholder’s contributions: PLN 23,121 and PLN 830.58 × 12 = PLN 9,967. Amounts are rounded to whole złoty.

A sole trader on the flat tax costs PLN 27,732 less than a company with 9% CIT, and Estonian CIT is PLN 4,701 lower than the flat tax. However, each additional złoty of the company’s administration costs reduces the amount for the shareholder by about PLN 0.82 (PLN 1 / 1.1 × 90%). The advantage therefore disappears where administration costs exceed those of a sole trader by about PLN 5,746 a year (PLN 4,701 / 0.8182).

If the profit stays in the business, the calculation changes: for a sole trader, tax and the health contribution arise on the whole income; in a company under standard CIT, retained profit bears only CIT; and under Estonian CIT the tax is deferred until distribution. Compare the options, therefore, for your planned distribution policy.

Liability – the shareholder, the management board and Article 116 of the Tax Ordinance

A sp. z o.o. separates the assets of the business from those of the shareholder, but its management board members are liable for its tax arrears – in a single-shareholder company, usually the owner personally.

In the case of a sole trader, the entrepreneur is the natural person carrying on business activity in their own name, so the debts of the business are that person’s debts. Management board members are jointly and severally liable with all their assets for the tax arrears of a sp. z o.o. if enforcement against the company’s assets has proved wholly or partly ineffective (Article 116 § 1 of the Tax Ordinance (Ordynacja podatkowa)). A management board member is released from liability by showing that, at the appropriate time, a bankruptcy petition (wniosek o ogłoszenie upadłości) was filed, restructuring proceedings were opened or an arrangement was approved, or that the failure to file the petition occurred without fault on the member’s part. The member is also released by indicating company assets from which enforcement will allow the arrears to be satisfied to a substantial extent.

The authority may therefore argue that the shareholder’s limited liability does not protect a shareholder-president of the management board. That is correct, but the defence does not end with the conditions in Article 116. On 29 August 2025 the Minister of Finance and Economy (Minister Finansów i Gospodarki) issued general tax ruling no. DTS2.8012.5.2025 in connection with the judgments of the Court of Justice of the European Union in Cases C-277/24 (Adjak) and C-278/24 (Genzyński). In it, the Minister took the position that a management board member may challenge the findings of fact and the legal classification in the decision issued to the company and has access to the case file of its proceedings. In the member’s own case, that decision is only evidence, which the member may rebut with counter-evidence – in respect of every tax.

If you choose a company for liability reasons, monitor its liquidity in respect of tax payments and the deadline for the bankruptcy petition.

Administration and the route by which money reaches the owner

A company requires full accounting and a legal title for every payment to the owner – take this into account in your calculation.

As a legal person, a sp. z o.o. is a CIT taxpayer (Article 1(1) of the CIT Act) and opens books of account as at the day on which it starts business activity (Article 12(1)(1) of the Accounting Act (ustawa o rachunkowości)). For a natural person, that obligation applies only from revenue of EUR 2,500,000 (PLN 10,646,500 in 2026), so the sole trader in the example may keep a tax revenue and expense ledger (podatkowa księga przychodów i rozchodów). The National e-Invoicing System (Krajowy System e-Faktur, KSeF) does not distinguish between the forms: from 1 April 2026 it covers, as a rule, both the sole trader and the company.

For a sole trader, profit is the owner’s income at the moment it is earned, so you transfer funds from the business account to your private account without any additional tax. In a company, every payment requires a legal title – a dividend, remuneration or a contract – each with different consequences for PIT and for contributions. Under Estonian CIT there is an additional record-keeping requirement. According to the Ministry of Finance’s explanatory notes, without separate identification in equity of the profits from the lump-sum period, “the PIT on the company’s distributed profits paid out of the distribution of such profits cannot be reduced by the part of the lump-sum tax due” (point 104).

Ask an accounting firm for a quote for administering both forms and add the difference to the table; for the Estonian option, compare it with the threshold of about PLN 5,746.

Succession, financing and the entry of an investor

A company continues regardless of changes of owner, whereas a sole trader’s business remains tied to the person of the entrepreneur – and this is decisive for succession, financing and the entry of an investor.

When the articles of association are concluded, a sp. z o.o. in organisation comes into being (Article 161 § 1 of the Commercial Companies Code (Kodeks spółek handlowych)), which – as the Director of the KIS noted in the ruling of 7 May 2025 – “has legal subjectivity and may be a party to legal relations”. The death of a shareholder therefore does not interrupt its business; check what the articles of association provide for in that event. The continuation of a sole trader’s business after the entrepreneur’s death is governed by the Act on succession management of a natural person’s enterprise (ustawa o zarządzie sukcesyjnym przedsiębiorstwem osoby fizycznej) – plan its application in advance.

An investor can join a company as a shareholder, but cannot join a sole trader’s business. However, an investor that is a company rules out the lump-sum tax (Article 28j(1)(4) of the CIT Act).

The transition itself from a sole trader to a company has its own consequences: on a conversion, the company succeeds to the entrepreneur’s tax rights but not to the entrepreneur’s liabilities, it continues the tax values of the assets, and the articles of association are subject to the tax on civil law transactions. We discuss them in the article on conversion and in the e-book “Sole trader to sp. z o.o.: procedure, taxes and first settlements”.

The most common mistake

The most common mistake is choosing a company after comparing the rates alone: 9% CIT against the 19% flat tax or 32% under the tax scale.

Such a comparison leaves out three items. The first is 19% PIT on dividends: with 9% CIT, taxes absorb 26.29% of the result, and with 19% CIT – 34.39%. The second is the sole shareholder’s contributions – PLN 33,088 a year, due also where there are no distributions and not deductible from the dividend. The third is the company’s administration costs: full accounting, financial statements, resolutions. As a result, in the example a company with 9% CIT costs PLN 27,732 more than a sole trader on the flat tax.

How to avoid it: calculate each option from the same result, add the tax on distribution, the contributions and the difference in administration costs, and only then compare.

Summary

1. Calculate all options from the result before tax and before the owner’s contributions, adding the tax on distribution and the contributions.
2. Check the conditions for the 9% rate: small taxpayer status, the revenue limit for the year and the two-year waiting period after the conversion of a sole trader or the contribution of an enterprise.
3. Treat Estonian CIT as a conditional option: if neither the employment condition in Article 28j(1)(3) nor the status of a taxpayer starting business activity is met, it does not enter the calculation; file the ZAW-RD by the end of the first month of the lump-sum tax year.
4. Assess liability realistically: as a management board member of your own company, you are liable for its tax arrears under the rules of Article 116 of the Tax Ordinance.
5. Add the difference in administration costs and plan the route by which money reaches the owner, succession and the entry of an investor before you register a company or convert your sole trader’s business.

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 23 January 2025, no. 0111-KDIB1-2.4010.697.2024.2.ANK – a company to which an organised part of an enterprise from a sole trader’s business was contributed applies the 9% rate only after the two-year waiting period under Article 19(1a)(5) of the CIT Act. https://eureka.mf.gov.pl/informacje/podglad/623412
• Individual tax ruling of the Director of the National Revenue Information Service of 7 May 2025, no. 0111-KDIB1-2.4010.139.2025.2.END – the business activity of a sp. z o.o. starts on the day on which the articles of association are concluded, and a notification electing the lump-sum regime filed after the deadline under Article 28j(1)(7) of the CIT Act is ineffective. https://eureka.mf.gov.pl/informacje/podglad/637935
• Individual tax ruling of the Director of the National Revenue Information Service of 15 June 2026, no. 0112-KDIL2-2.4011.446.2026.2.MG – the deduction of social security and health contributions under the flat tax, within the PLN 14,100 limit under Article 30c(2) of the PIT Act, is the taxpayer’s entitlement. https://eureka.mf.gov.pl/informacje/podglad/696495
• Tax explanatory notes of 23 December 2021 on the lump-sum corporate income tax – the total burden of the company’s and the shareholder’s tax on a distribution of profit (example 50) and the condition of separately identifying in equity the profits from the lump-sum period in order to reduce PIT (points 104–106). https://eureka.mf.gov.pl/informacje/podglad/481345
• General tax ruling no. DTS2.8012.5.2025 of the Minister of Finance and Economy of 29 August 2025 on the application of Article 116 of the Act – Tax Ordinance in connection with the judgments of the Court of Justice of the European Union of 27 February 2025 in Case C-277/24 (Adjak) and of 30 April 2025 in Case C-278/24 (Genzyński) (Dz. Urz. Min. Fin. i Gosp. z 2025 r. poz. 10) – the right of a management board member to raise objections to the findings of fact and legal classifications in the assessment decision issued to the company, access to the case file of its proceedings, and the decision as evidence that may be rebutted by counter-evidence – in respect of all taxes. https://www.gov.pl/web/finanse/interpretacja-ogolna-nr-dts2801252025-ministra-finansow-i-gospodarki
• Social Insurance Institution, “Annual assessment base for the health insurance contribution of persons carrying on business activity” (Roczna podstawa wymiaru składki na ubezpieczenie zdrowotne osób prowadzących działalność gospodarczą) of 17 February 2023 – the income constituting the base for the health contribution is reduced by social security contributions not treated as tax-deductible costs. https://www.zus.pl/-/roczna-podstawa-wymiaru-sk%C5%82adki-na-ubezpieczenie-zdrowotne-os%C3%B3b-prowadz%C4%85cych-dzia%C5%82alno%C5%9B%C4%87-gospodarcz%C4%85
• Ministry of Finance, the podatki.gov.pl website, “Deduction of social security contributions (PIT)” (Odliczenie składek na ubezpieczenie społeczne (PIT)), update of 24 June 2026 – an entrepreneur’s social security contributions are deducted from income under the tax scale and the flat tax, or treated as tax-deductible costs. https://www.podatki.gov.pl/ulgi-i-odliczenia/odliczenie-skladek-na-ubezpieczenie-spoleczne-pit

Related materials

• ZUS and health contributions of entrepreneurs and shareholders – who pays and on what base
• Estonian CIT – entry conditions, hidden profits and the real cost of distributing profit
• Tax scale, flat tax or lump sum – choosing a form of taxation with the health contribution
• JDG → spółka z o.o. (Sole trader to sp. z o.o.: procedure, taxes and first settlements) – an e-book in the Biblioteka Restrukturyzacji series; the PDF is available free of charge in the E-books section
• Advanced calculator – comparison: sole trader or sp. z o.o. (CIT, Estonian CIT, dividend)

Legal basis: Act of 26 July 1991 on personal income tax (consolidated text: Dz.U. z 2026 r. poz. 592, as amended): Article 22(1), Article 26(1)(2)(a), Article 27(1), Article 30a(1)(4) and Article 30a(19), Article 30c(1), Article 30c(2)(1) and (2); Act of 15 February 1992 on corporate income tax (consolidated text: Dz.U. z 2026 r. poz. 554, as amended): Article 1(1), Article 4a(10), Article 19(1)(1) and (2), Article 19(1a)(2), (3) and (5), Article 19(1d) and (1e), Article 28j(1)(3), (4) and (7), Article 28j(2), Article 28o(1); Act of 29 August 1997 – Tax Ordinance (consolidated text: Dz.U. z 2026 r. poz. 622, as amended): Article 116 § 1; Act of 13 October 1998 on the social insurance system (consolidated text: Dz.U. z 2026 r. poz. 199, as amended): Article 8(6); Act of 27 August 2004 on health care services financed from public funds (consolidated text: Dz.U. z 2025 r. poz. 1461): Article 81(2za); Act of 29 September 1994 on accounting (consolidated text: Dz.U. z 2026 r. poz. 522): Article 12(1)(1); Act of 15 September 2000 – Commercial Companies Code (consolidated text: Dz.U. z 2024 r. poz. 18, as amended): Article 161 § 1; Act of 5 July 2018 on succession management of a natural person’s enterprise and other facilitations relating to business succession (consolidated text: Dz.U. z 2021 r. poz. 170): provisions on succession management; Act of 5 August 2025 amending the Act on the tax on goods and services and the Act amending the Act on the tax on goods and services and certain other acts (Dz.U. z 2025 r. poz. 1203): provisions introducing the KSeF obligation.