For a Polish private investor, a workspace budget and tax-deductible instrument costs are different calculations. Do not assume that rent, electricity, internet or equipment becomes deductible on PIT-38 simply because it supports trading. A business or company comparison first requires the appropriate income classification and examination of each expense.

Home plus PIT-38 — check which costs qualify

For qualifying private instrument income in Poland, PIT-38 reports the relevant revenue and eligible costs. Article 30b(1) applies a 19% rate to its specified income categories. The label forex does not classify every currency transaction, and virtual-currency income has separate rules even though it uses the same form. First identify the instrument and income category.

Separate documented acquisition, disposal and settlement costs from general household spending. A mixed-use expense needs a legal basis and evidence before any deduction is considered; paying a subscription or utility bill is not enough. NBP conversion values foreign-currency amounts and is not itself a separate purchase cost.

The distinction matters before comparing budgets. Article 30b(4) excludes its private-investment regime where the relevant transactions occur in business activity. Registering a business or trading frequently does not settle that qualification on its own. Describe the instrument, actual activity and records to a Polish tax adviser; a cash-budget comparison cannot decide the income category.

Sole proprietorship and company — when part of the apartment becomes a cost

Registering a sole proprietorship does not by itself turn private instrument income into business income. If the transactions occur in business activity and a regime is available, assess deductible expenses, record-keeping and applicable insurance obligations under that regime. Costs remain subject to the statutory revenue connection and exclusions.

For a business-income scenario, Article 22 requires the statutory connection with revenue or its source and examination of Article 23 exclusions. Explain and document actual business use of premises and a defensible allocation. Floor-area arithmetic alone does not establish deductibility, and a dedicated room is not a universal statutory condition for every expense.

A Polish limited company (sp. z o.o.) and its owner are separate taxpayers. Before charging apartment expenses to the company, identify the contractual arrangement, who pays each bill and how the premises serve company revenue. A registered address alone does not establish a deductible cost under Article 15 of the CIT Act. For the registration mechanics see the piece on sole proprietorship versus company; for the broader record-keeping backdrop, see our taxes section.

A hypothetical example — Marek, 80 m² apartment in Wrocław

Take a hypothetical Marek in an 80 m² apartment in Wrocław. A 20 m² workspace occupies 25% of the area. Assume monthly spending of PLN 1,200 rent and building fees, PLN 300 electricity, PLN 500 heating and PLN 80 internet: PLN 2,080 monthly or PLN 24,960 annually. Applying 25% uniformly produces a model allocation of PLN 6,240 annually. This is arithmetic, not proof that each utility has the same business share; justify allocation expense by expense. These amounts are assumed, not rental-market quotes.

The hypothetical annual workspace allocation is PLN 6,240. If that entire amount is eligible and sufficient income is taxed at 19%, the basic tax reduction is 6,240 × 19% = PLN 1,185.60. At 9% it would be PLN 561.60, but classical CIT 9% does not cover capital gains; a company trading such instruments must not apply that rate merely because it is small. This calculation excludes insurance, distribution taxes and other obligations.

In the hypothetical 19% case, PLN 6,240 less the PLN 1,185.60 tax reduction leaves PLN 5,054.40 of spending after that effect. The entire PLN 6,240 must still be paid. If there is no current tax to reduce, the model gives no immediate tax saving; it does not predict a refund or assess future loss relief.

Lower rent can mean a larger budget

Add travel spending to the comparison and track time separately. A hypothetical month with 18 working days shows how a PLN 200 rent difference can disappear.

Scroll sideways to see the full diagram

The full workspace budgetThe bars share a spending scale. A costs PLN 800 rent plus PLN 270 travel, or PLN 1,070 monthly. B has no commute and costs PLN 1,000. With 18 days, two journeys daily and 35 minutes each, A also requires 21 hours of travel.RENT IS ONLY PART OF THE BUDGETA: with a commuteRent PLN 800Travel PLN 270B: no commuteRent PLN 1,000A: 800 + 270 = PLN 1,070 / monthB: 1,000 + 0 = PLN 1,000 / monthA also takes 21 hours of travel

Hypothetical monthly Polish budget in 2026. A: PLN 800 rent, 18 days, two journeys daily, each costing PLN 7.50 and taking 35 minutes. B: PLN 1,000 rent and no commute. Other spending is identical; tax and VAT are excluded. The document PIT Act: Articles 22 and 23 confirms that Article 22(1) makes deductibility conditional on the connection with revenue or its source and the exclusions in Article 23. A budget expense alone does not establish deductibility.

Spending uses a common scale. Time has no assigned PLN value.

A's journeys cost 18 × 2 × 7.50 = PLN 270 and take 18 × 2 × 35 = 1,260 minutes, or 21 hours. Under these assumptions A requires PLN 70 more cash than B despite its lower rent. This budget comparison does not determine tax deductibility or the value you place on time, quiet or working conditions.

A rented office — full cost, but a real net figure

Hypothetical dedicated office spending is PLN 1,850 monthly or PLN 22,200 annually. Sole business use may simplify allocation, but does not itself make every charge deductible. Establish the revenue connection, statutory exclusions and supporting documents before calculating a tax reduction.

If the whole PLN 22,200 qualifies and reduces sufficient income taxed at 19%, the model tax reduction is PLN 4,218 and spending after that effect is PLN 17,982. With no current tax to reduce, the immediate cash outlay remains PLN 22,200. Neither calculation includes VAT recovery, insurance or other obligations. Compare the incremental budget with the actual work benefit, rather than treating a deduction as reimbursement.

Cash before the tax effect

Suppose the office contract requires a refundable PLN 3,700 deposit and six monthly payments of PLN 1,850. First-month cash is PLN 5,550. The six-month commitment requires PLN 14,800 including the deposit; after full repayment of that deposit, spending is PLN 11,100. After month one, five assumed payments still total PLN 9,250. These are hypothetical contract terms, not a statutory notice period.

Renting an office does not itself establish business activity. Check the registered address, the records that require an update and the lease terms with the company documents. Read the proposed lease for its actual term, deposit and exit rules rather than assuming a standard commitment.

For a business-income expense, examine the statutory revenue connection, exclusions and actual-use documentation before claiming a deduction. A spending allocation alone does not establish eligibility.

What goes in and what stays out

For private Article 30b(1) income, establish eligible instrument-related costs from law and records. Do not treat all broker charges as certain deductions or assume every third-party service is categorically excluded without examining its legal connection. Foreign-currency conversion is a valuation method and must not be counted as an additional expense.

For business income, rent, utilities, equipment, software or professional services are candidate expenses rather than an automatically accepted list. Check the revenue connection, actual business use, invoice or contract and statutory exclusions for each one. An area percentage may help explain some costs but cannot by itself allocate every bill. Private spending does not acquire a business purpose merely through its description.

Your next step

  1. Build a complete cash budget for home, an office and coworking. Separate payments, any refundable deposit, remaining lease commitment and only then a conditional tax effect. Assess income classification separately from expected profit.
  2. Ask a Polish tax adviser how the instrument and actual activity are classified, and which premises expenses could meet the relevant cost rules. A PIT-38 filing or business registration alone does not answer every expense question.
  3. Document actual use and an expense-specific allocation. Measurements, a floor plan and records can support the explanation; they are not a guarantee that the tax authority will accept every deduction.
  4. Obtain comparable quotes for offices and coworking arrangements, including travel, utilities and exit costs. Compare the complete cash budget and time implications with your current workspace; no universal price multiple is assumed.
  5. Read the applicable cost provisions and retain supporting records through the relevant limitation period. In Poland, Article 70 generally counts five years from the end of the year in which payment was due, but suspension or interruption can change that endpoint. Article 86 ties retention of tax books and related documents to limitation; do not destroy them automatically after five calendar years.