Setting up a sole proprietorship in Poland is currently relatively simple from a technical perspective. The application can be submitted online through CEIDG, and starting a business does not require visiting several offices. However, this does not mean that setting up a business should be treated as a quick formality.

The most important decisions are made by the entrepreneur before registration. These primarily concern the choice of the form of taxation, VAT analysis, determining ZUS obligations, checking the obligation to use a cash register, selecting PKD codes, and preparing the rules for bookkeeping and invoicing.

A mistake made at the beginning may have real financial consequences: higher tax, incorrectly calculated health insurance contribution, ZUS arrears, VAT problems, or the need to correct documents.

1. Where should business planning begin?

Before submitting the CEIDG application, it is worth answering several basic questions:

• what exactly will I sell,
• who will I sell to: businesses or private individuals
• will my clients be from Poland, the European Union, or outside the EU,
• will the activity be carried out on-site, online, or in a hybrid model,
• will I operate independently, or with employees or associates,
• what costs will I incur,
• does the activity require a concession, permit, registration in a register, or meeting specific industry requirements.

This is important because a programmer providing services to a foreign company will have different obligations, a beautician serving private individuals will have different obligations, and an online store selling goods to customers from various EU countries will have different obligations.

Already at this stage, it is necessary to check whether the activity may benefit from a VAT exemption, whether it requires a cash register, whether lump-sum taxation will be possible, and whether the selected cooperation model does not generate additional tax obligations.

2. Choosing the form of business activity

The simplest form of starting a business is a sole proprietorship. It works well when the entrepreneur operates independently, does not plan a complicated structure, and wants to limit formal costs.

However, it must be remembered that in the case of a sole proprietorship, the entrepreneur is liable for the business obligations with all of their assets. There is no separate legal personality here, unlike in a limited liability company.

When is a sole proprietorship sufficient?

A sole proprietorship may be a good choice when:

• the activity is to be conducted independently,
• the business risk is moderate,
• the entrepreneur does not need a partner,
• the costs of running the business are to be as low as possible,
• bookkeeping is to be simplified

When is it worth considering a company?

A company, especially a limited liability company, is worth considering when:

• the activity involves greater financial risk,
• the business is to be conducted with a partner,
• larger investments are planned,
• the entrepreneur wants to limit personal liability,
• the business is to have a more formal structure,
• in the future it may be possible to obtain an investor or sell shares.

A limited liability company provides greater protection of assets, but it also means full accounting, reporting obligations, higher service costs, and greater formalism.

3. Choosing PKD codes

PKD codes define the types of activity performed by the entrepreneur. They are provided in the CEIDG application. More than one code may be indicated, but one should be marked as the predominant activity.

The choice of PKD codes has practical significance. It may affect, among other things:

• the possibility of applying lump-sum taxation,
• the correct lump-sum tax rate,
• the obligation to register for VAT,
• the obligation to have a cash register,
• required permits or concessions,
• the possibility of using grants or industry programmes.

Codes should not be entered at random. On the other hand, it is necessary to include not only what the entrepreneur will do on the first day of business, but also the services or sales that are realistically planned.

4. Choosing the form of taxation

This is one of the most important decisions when setting up a business. A natural person conducting business activity currently has primarily three forms to choose from: the tax scale, flat-rate tax, and lump-sum tax on recorded revenue.

Tax scale

The tax scale means taxation at the rates of 12% and 32%. The current scale provides for 12% up to the tax base of PLN 120,000 and 32% on the excess over PLN 120,000; the tax-reducing amount is PLN 3,600.

The tax scale may be advantageous when the entrepreneur:

• has lower or medium income,
• wants to use the tax-free amount,
• plans to file jointly with a spouse,
• wants to use tax reliefs,
• incurs business costs,
• is not sure whether income will be high from the very beginning.

Under the tax scale, tax is paid on income, i.e. revenue reduced by costs. This means that properly documented business expenses may reduce the tax base.

However, it must be remembered that after exceeding the tax threshold, the surplus income is taxed at the rate of 32%.

Flat-rate tax

The flat-rate tax is 19%. The rate is fixed regardless of the amount of income. It may be advantageous at high income levels, but it will not always be the best choice.

Flat-rate tax may be advantageous when the entrepreneur:

• achieves high income,
• does not want to use joint taxation with a spouse,
• does not use reliefs available under the tax scale,
• incurs business costs,
• wants to avoid entering the second tax bracket.

Under flat-rate tax, income is also settled, which means that tax-deductible costs may be taken into account. The limitation, however, is the lack of some preferences available under the tax scale, in particular joint filing with a spouse.

The health insurance contribution under flat-rate tax is calculated differently than under the tax scale. As a rule, it is 4.9% of the assessment base, taking into account the minimum health insurance contribution.

Lump-sum tax on recorded revenue

Lump-sum taxation means taxation of revenue, not income. The entrepreneur does not reduce the tax base by business costs. The rate depends on the type of activity performed.

Lump-sum taxation may be advantageous when:

• business costs are low,
• the entrepreneur provides services covered by a favourable rate,
• the activity is simple from a cost perspective,
• the entrepreneur wants simplified records,
• the correct lump-sum rate can be properly determined.

Lump-sum taxation may be disadvantageous when the business incurs significant costs, for example purchases goods, equipment, subcontractor services, materials, or incurs high marketing costs.

For 2026, the revenue limit for 2025 entitling a taxpayer to lump-sum taxation is EUR 2,000,000, i.e. PLN 8,517,200. The limit for quarterly settlement of lump-sum tax is EUR 200,000, i.e. PLN 851,720.

How should the form of taxation be chosen?

The form of taxation should not be selected solely based on the tax rate. It is necessary to calculate:

• projected revenue,
• expected costs,
• income,
• the health insurance contribution,
• the possibility of joint filing,
• tax reliefs,
• the type of services,
• the risk of applying an incorrect lump-sum rate,
• planned investments.

Example: lump-sum taxation may look attractive at a low rate, but if the entrepreneur has high costs, tax on revenue may be less advantageous than taxation of income. Flat-rate tax may be favourable at high income levels, but not always if the entrepreneur could file jointly with a spouse under the tax scale.

5. Registration of business activity in CEIDG

A sole proprietorship is registered in CEIDG. The CEIDG-1 application applies to a natural person conducting business activity and at the same time constitutes a notification to GUS, the tax office, and ZUS/KRUS.

The application may be submitted online through Biznes.gov.pl, and business registration is a service available electronically.

The CEIDG application includes, among other things:

• the entrepreneur’s details,
• the business name,
• the address for service,
• the address where the activity is conducted, if any,
• the date of commencement of activity,
• PKD codes,
• the form of taxation,
• bank account details,
• information concerning ZUS,
• details of the accounting office, if already selected.

Business activity may be commenced from the date indicated in the application. This may be the date of submitting the application or a later date. It is worth planning this date consciously because obligations in ZUS, taxes, and bookkeeping depend on it.

6. ZUS and contributions

After setting up the business, the entrepreneur must determine which insurance schemes they should register for. As a rule, the entrepreneur has 7 days from the start of business activity to register themselves for the appropriate insurance. Registration is made, among others, on the ZUS ZUA or ZUS ZZA form, depending on the scope of insurance.

Start-up relief

A beginning entrepreneur may, after meeting the conditions, use start-up relief. This means no obligation to pay social insurance contributions for the first 6 months of running the business. The relief does not apply to the health insurance contribution - the entrepreneur pays the health insurance contribution.

This solution reduces costs at the beginning of the activity, but it must be remembered that the lack of social insurance contributions also means the lack of protection under these insurance schemes during this period, for example in relation to sickness benefit.

Preferential ZUS contributions

After start-up relief, the entrepreneur may usually use preferential contributions for 24 months, provided that the conditions are met. In 2026, the minimum wage is PLN 4,806, and the lowest basis for preferential contributions is 30% of this amount, i.e. PLN 1,441.80. The lowest preferential social security contributions in 2026 amount to PLN 456.18.

Small ZUS Plus

Small ZUS Plus is intended for entrepreneurs conducting activity on a smaller scale, after meeting statutory conditions. From 1 January 2026, new rules apply for counting the periods of using this relief. An entrepreneur who meets the conditions may use Small ZUS Plus for 36 months in each period of 60 calendar months of conducting business activity.

One of the conditions for Small ZUS Plus is the revenue limit from the previous year - as a rule, PLN 120,000.

Health insurance contribution

The health insurance contribution depends on the form of taxation. It is monthly and indivisible. Under flat-rate tax, as a rule, it amounts to 4.9% of the assessment base, while under the tax scale the basic mechanism is different and requires a separate calculation.

In 2026, the minimum health insurance contribution under the tax scale and flat-rate tax is: for January 2026 - PLN 314.96, and from February 2026 - PLN 432.54.

Under lump-sum taxation, the health insurance contribution depends on revenue. In 2026, the monthly amounts are: PLN 498.35 for revenue up to PLN 60,000; PLN 830.58 for revenue above PLN 60,000 and up to PLN 300,000; PLN 1,495.04 for revenue above PLN 300,000.

ZUS payment deadlines

For most entrepreneurs conducting a sole proprietorship, the deadline for submitting settlement documents and paying contributions is the 20th day of the following month. If the deadline falls on a Saturday, Sunday, or public holiday, it is moved to the next business day.

7. VAT

Not every entrepreneur must be an active VAT taxpayer from the first day of business. However, it is necessary to check whether an exemption may be used and whether the type of activity does not exclude the exemption.

VAT covers, among other things, the paid supply of goods, the paid provision of services, export and import of goods, intra-Community supply of goods, and intra-Community acquisition of goods, if the place of taxation is Poland.

VAT exemption

As at 17 May 2026, the limit for the subjective VAT exemption is PLN 240,000 of sales value. However, this does not mean that every entrepreneur may use the exemption. Some types of sales or services exclude the right to exemption and require VAT registration regardless of the limit.

When is voluntary VAT registration worthwhile?

Voluntary VAT registration may be advantageous when the entrepreneur:

• buys goods or services with VAT,
• incurs high investment expenses,
• cooperates mainly with businesses that are VAT taxpayers,
• wants to deduct input VAT on purchases.

It may be less advantageous when the clients are mainly consumers who do not deduct VAT. In that case, VAT may increase the gross price or reduce the entrepreneur’s margin.

VAT-R, VAT UE, and reverse charge

VAT registration is made using the VAT-R form. In the case of transactions with EU contractors, registration for VAT UE may be necessary.

Services provided to foreign contractors require particular analysis. In many cases, the place of taxation may be the buyer’s country, and the reverse charge mechanism appears on the invoice. However, this does not release the entrepreneur from the obligation to properly report the transaction in the records.

Before starting, the entrepreneur should determine whether their clients will be from Poland, the EU, or outside the EU. This may change the invoicing method, VAT obligations, and reporting.

8. KSeF, invoices, and documenting sales

From 2026, the National e-Invoicing System is a very important element of running a business. The obligation to issue invoices in KSeF entered into force in stages: from 1 February 2026 for taxpayers who achieved gross sales exceeding PLN 200 million in 2024, and from 1 April 2026 for other taxpayers.

A transitional simplification has been provided for the smallest taxpayers: if the monthly value of sales documented by invoices does not exceed PLN 10,000 gross, the obligation to issue invoices in KSeF may be postponed until 1 January 2027.

Importantly, the obligation to receive invoices in KSeF applies from 1 February 2026, subject to statutory exceptions.

In practice, before starting business activity the entrepreneur should determine:

• in which system they will issue invoices,
• whether they must issue invoices in KSeF immediately,
• whether they may use the transitional PLN 10,000 limit,
• how they will receive cost invoices,
• who will have access to KSeF,
• how documents will be delivered to the accounting office.

9. Business bank account and the VAT taxpayers white list

A sole proprietorship does not always have to have a separate business bank account, but in practice it is highly recommended. Separating private and business finances makes bookkeeping, payment control, and documenting costs easier.

A business bank account is particularly important when the entrepreneur:

• is an active VAT taxpayer,
• receives payments from businesses,
• makes transactions of higher value,
• wants to be correctly visible on the VAT taxpayers white list,
• may receive payments under the split payment mechanism.

The VAT taxpayers white list has practical significance for contractors. If the account is not properly reported, the contractor may have a problem making a payment safely.

The split payment mechanism means that the net amount goes to the ordinary bank account, and VAT goes to the VAT account. In certain cases, this mechanism is mandatory. Therefore, an active VAT taxpayer should ensure that they have an account appropriate for business settlements.

10. Cash register

The obligation to have a cash register depends primarily on whom the entrepreneur sells to and what type of goods or services they offer.

Most often, the issue of a cash register concerns sales to:

• private individuals not conducting business activity,
• flat-rate farmers.

Some activities may benefit from an exemption, but certain types of sales are excluded from that exemption. The current rules for exemptions from the obligation to keep sales records using cash registers result from the Regulation of the Minister of Finance of 17 December 2024 on exemptions from the obligation to keep sales records using cash registers, as amended and also applicable in 2026.

Before starting business activity, it is necessary to check:

• whether sales will be made to private individuals,
• whether the given service or goods do not exclude the right to exemption,
• whether sales will be paid by bank transfer,
• whether an online cash register will be needed,
• from when recording must begin.

It should not be automatically assumed that a beginning entrepreneur may always use the cash register exemption. In some industries, the obligation may arise from the first sale.

11. Bookkeeping and documentation

The form of bookkeeping depends on the selected form of taxation.

Under the tax scale and flat-rate tax, the entrepreneur usually keeps a tax revenue and expense ledger, i.e. KPiR. Under lump-sum taxation, a revenue register is kept because costs do not reduce the tax base.

The entrepreneur should collect, among other things:

• sales invoices,
• cost invoices,
• payment confirmations,
• contracts with contractors,
• documents concerning fixed assets,
• leasing documents,
• HR documents if employees are employed,
• documents concerning the import of services, intra-Community acquisition of goods, intra-Community supply of goods, or export, if they occur.

A tax-deductible cost should be related to the business activity and properly documented. Not every expense paid from a business bank account is automatically a tax-deductible cost.

12. Obligations after setting up the business

After registering the business, the entrepreneur should keep track of ongoing obligations. The most important include:

• issuing invoices,
• handling KSeF, if applicable,
• transferring documents to bookkeeping,
• paying PIT advances or lump-sum tax,
• paying ZUS contributions,
• submitting ZUS settlement documents,
• submitting JPK_V7 by active VAT taxpayers,
• settling VAT UE, if applicable,
• monitoring cash register obligations,
• annual PIT settlement,
• updating data in CEIDG,
• obligations towards employees or contractors.

Changes in business data, such as address, PKD, bank account, or the form of conducting the activity, may be reported through CEIDG.

13. The most common mistakes made by beginning entrepreneurs

Choosing the form of taxation without calculation

This is one of the most common mistakes. The entrepreneur chooses lump-sum taxation because the rate seems low, but does not take costs into account. Or they choose flat-rate tax even though under the tax scale they could use the tax-free amount, reliefs, and joint filing.

No VAT analysis

Some entrepreneurs assume that if they are just starting, VAT does not concern them. This is not always true. The type of activity, foreign contractors, EU transactions, or exclusions from exemption may create VAT obligations from the beginning.

Incorrect PKD

Incorrect PKD may cause problems with lump-sum taxation, concessions, grants, or industry obligations.

No proper registration with ZUS

Entry in CEIDG does not close the topic of insurance. It is necessary to determine the correct registration code, the scope of insurance, and the right to reliefs.

Mixing private and business expenses

Private purchases paid from the business account and business costs paid from a private account make bookkeeping more difficult and increase the risk of errors.

Not taking the health insurance contribution into account

The health insurance contribution is very important when comparing forms of taxation. The tax rate alone is not enough to make a decision.

Contacting the accountant too late

It is best to consult an accounting office before registering the business. After submitting the application, some decisions can be changed, but this often requires corrections, additional registrations, or explanations.

Incorrect documentation of costs

A cost must be related to the business, properly documented, and economically justified. An invoice alone is not always sufficient.

No control over deadlines

ZUS, PIT, VAT, JPK, KSeF, and cash registers have specific deadlines. Failure to meet them may result in interest, corrections, sanctions, or additional explanatory activities.

14. Checklist before setting up a business

Before registering a business, it is worth answering the following questions:

1. What exactly will I sell?

2. Who will I sell to: businesses or private individuals?

3. Will clients be from Poland, the EU, or outside the EU?

4. Will the activity be online, on-site, or mixed?

5. What will my monthly costs be?

6. Will I employ employees or associates?

7. Which PKD best describes my activity?

8. Which PKD code will be predominant?

9. Does the activity require a permit, concession, or registration in a register?

10. Which form of taxation is the most advantageous after taking the health insurance contribution into account?

11. Can I and do I want to use joint filing with a spouse?

12. Am I entitled to tax reliefs?

13. Should I be an active VAT taxpayer?

14. Do I have to register for VAT UE?

15. Will I issue invoices in KSeF from the beginning?

16. Can I use the transitional simplification in KSeF up to PLN 10,000 per month?

17. Do I need a cash register?

18. Can I use start-up relief?

19. After start-up relief, will I be entitled to preferential contributions?

20. May I use Small ZUS Plus in the future?

21. Do I have the right bank account?

22. Should the account be reported to the white list?

23. How will I issue invoices?

24. How will I transfer documents to bookkeeping?

25. Have I chosen an accounting office before registration?

15. How can an accounting office help?

An accounting office can help the entrepreneur even before submitting the CEIDG application. This is the best moment to check the tax consequences and avoid incorrect decisions.

The scope of support may include:

• analysis of the form of taxation,
• comparison of tax and the health insurance contribution,
• VAT analysis,
• determining whether VAT or VAT UE registration is necessary,
• verification of PKD codes,
• checking the right to ZUS reliefs,
• assistance with the CEIDG application,
• preparation of ZUS registrations,
• analysis of the cash register obligation,
• preparation for KSeF,
• determining invoicing rules,
• keeping the KPiR or revenue register,
• submitting JPK_V7,
• reminders about deadlines,
• ongoing support with costs and documents.

Summary

Setting up a sole proprietorship is formally simple, but it requires well-considered decisions. The most important issues are the form of taxation, VAT, ZUS, the health insurance contribution, cash register, KSeF, PKD, and the method of bookkeeping.

It is not worth setting up a business “quickly” without analysis. Some mistakes can be corrected later, but this often means corrections, additional registrations, and unnecessary stress.

If you are planning to start a business, consult an accounting office before registration. This will allow you to choose the correct form of taxation, verify VAT and ZUS obligations, and start the business with orderly bookkeeping from the first day.