01/07
Basics · Part C · E · 7 min read
What Can You Deduct in PIT-38? (Purchase, Commissions, Fees)
Lower your Belka tax by deducting the right costs. Learn which commissions, fees and expenses are legitimate 'Tax Deductible Costs' (KUP) in PIT-38.
A guide to the PIT-38 return · tax year 2025
PIT-38 without the guesswork.
Stocks, ETFs, dividends and crypto — explained in plain language, checked against the Ministry of Finance brochure and converted at the right NBP rate.
- 30.04.2026
- last day to file the 2025 return
- 7
- guides, in reading order
- D−1
- NBP rate from the day before the transaction
Tax duePLN 42
Part D · field 3519% × PLN 222 = 42.18 → PLN 42
01 — Topics
Four topics. Each has one number worth remembering.
The bar under each number draws it to scale — 19% really is less than a fifth.
- 19%Basicsthe tax rate on income from stocks, ETFs and crypto2 guides
- 50%Stocksthe most of a stock loss you can deduct in any one year — over the next 5 years1 guide
- 15%ETFs & dividendsUS withholding tax when you have filed a W-8BEN form1 guide
- 100%Cryptoexcess crypto costs carry into the next year in full3 guides
02 — Guides
Seven guides. Each one starts with a diagram.
All guides (7) →02/07
Stocks · Part C · 7 min read
Cost Basis Explained: Understanding FIFO in PIT-38
Confused about calculating your stock cost basis for tax? Learn why Poland uses the FIFO (First-In, First-Out) rule and why using an 'Average Price' can get you into trouble.
03/07
ETFs & dividends · Part C · G · 9 min read
How to Declare ETF Income and Dividends in PIT-38
A complete guide to declaring ETF capital gains and dividends in PIT-38. Learn how to calculate taxes for Revolut, eToro, and other foreign brokers.
03 — Currency Converter
The rate from the day before. Not from the day itself.
The converter steps back to the last business day before the date you enter — skipping weekends and holidays — and returns the table number for your records.
- 1,000.00 EUR × 4.2782
- PLN 4,278.20
- EUR mid rate · Table A
- 4.2782
04 — Sources
What we rely on.
MF brochure
The Ministry of Finance information brochure for the 2025 PIT-38 return.
The PIT Act
Art. 9, 11a, 17, 22, 30a and 30b of the Polish Personal Income Tax Act.
NBP rates
Average rates from Table A, from the last business day before the transaction.