Business revenue under flat-rate PIT: more than sales

Below we discuss the revenue categories identified in the Ministry of Finance guidance on flat-rate income tax. This is a narrowly focused overview, not a determination of how to account for a particular event.

Which revenue categories does the Ministry list?

The Ministry states that business revenue includes revenue from, among other things:

• sales of goods,
• services provided,
• grants received,
• interest received on business bank accounts,
• liabilities that have been cancelled or become time-barred,
• exchange differences.

“Among other things” means that this is not an exhaustive list. Do not treat it as confirmation that every grant or every bank account transaction is taxable. For bank accounts, the Ministry specifically lists interest received on business accounts. This guide does not assess whether a particular grant is exempt or the consequences of a particular liability being cancelled or becoming time-barred.

VAT-taxable sales: reducing revenue

If you sell goods and services subject to VAT, you must reduce the revenue from those sales by the VAT due. This rule concerns the specified VAT-taxable sales—we do not determine here whether VAT is due on individual events or how much is due.

Revenue, income and loss

The Ministry gives the following formula:

Income = revenue − tax-deductible costs.

If the tax-deductible costs incurred exceed revenue, there is a loss. We do not discuss how to account for that loss here.

Tax-deductible costs are costs incurred to generate revenue or to preserve or safeguard its source, except for costs listed in Article 23 of the Polish PIT Act. This purpose-related connection and the statutory exclusion are part of the definition; we do not provide a catalogue of expenses or classify particular purchases here.

Optional checklist for organizing documents

As an organizational recommendation, we suggest gathering the following in one place, where relevant to your business:

• documents concerning grants received,
• bank statements or summaries showing interest received on business accounts,
• documents concerning liabilities that have been cancelled or become time-barred,
• foreign-currency transaction documents for a separate analysis of exchange differences.

This is an optional supporting checklist, not a source-established list of documentation obligations. Gathering documents does not, by itself, determine the tax treatment of the events.

Limits of this guide

This text is not a general catalogue of costs, instructions for investigating an underpaid invoice, or a guide to calculating exchange differences. We do not determine when revenue arises, tax rates, advance tax payments or individual settlement amounts.

Source of the rules: Ministry of Finance — Flat-rate income tax, “How to calculate income or loss” section.