The currency is the złoty, not the euro
Poland is a European Union member but has not adopted the euro, and its official currency is the złoty, abbreviated PLN and divided into 100 grosz. Prices in shops, restaurants, transport tickets and admission fees are quoted in złoty. Some businesses very close to major tourist sites may informally accept euros or quote prices in them, but this is not the norm across the country, and doing so typically means accepting whatever informal exchange rate that specific vendor sets, which is rarely in your favour compared to paying in local currency.
Cards and contactless payment
Contactless debit and credit cards are widely accepted across Polish cities, in line with the broader shift toward cashless, phone-based payment described in VoyageWindow's separate guide to BLIK and Poland's cashless culture. A foreign-issued contactless card, or a phone's contactless wallet linked to one, will work at the vast majority of card terminals you encounter in Warsaw, Kraków or Gdańsk.
BLIK itself — the six-digit code system described on BLIK's own site as generated inside a Polish bank's mobile app — is not usable with a foreign card or a non-Polish bank account. If you see a payment terminal or a shop advertising BLIK specifically, that is a signal about how locals pay there, not an option available to you as a visitor without a Polish bank account.
The dynamic currency conversion trap
The single most common way visitors lose money on card payments abroad, including in Poland, is dynamic currency conversion (DCC) — being offered, at a card terminal or an ATM, the choice to be charged in your home currency instead of the local one. This sounds like a convenience, since you can see the amount in a currency you recognise before confirming. In practice, the exchange rate applied by the terminal or ATM operator in a DCC transaction is typically worse than the rate your own card network would apply if you simply chose to be charged in złoty and let your bank handle the conversion.
This applies just as much at ATMs as at card terminals. Some standalone, independent ATMs — the kind not directly branded as a specific Polish bank, sometimes found in tourist-heavy areas — are more likely to default to or push a DCC conversion, and can also carry higher withdrawal fees than a bank-branded machine. Where you have a choice, using an ATM attached to or inside a recognisable Polish bank branch, and always selecting the "charge in PLN / local currency" option when prompted, avoids the worst outcomes of both higher fees and worse conversion rates.
Cash still has a place
Despite Poland's fast-moving shift toward contactless and app-based payment, cash has not disappeared, and treating the country as fully cashless would be a mistake. Some smaller vendors, market stalls, and more traditional establishments — including some of the milk bars covered in VoyageWindow's separate guide to that topic — prefer or require cash. Carrying a modest amount of złoty as a backup, rather than relying entirely on cards and contactless payment, avoids being caught out at the specific businesses that haven't fully moved away from cash.
What this guide does not cover
This guide covers the general shape of paying in Poland as a visitor: currency, card acceptance, BLIK's limits for foreign visitors, and the dynamic currency conversion trap. It does not cover current exchange rates, specific bank fee schedules, or tax-free shopping refund procedures for visitors from outside the EU — those depend on your own bank's terms and change too often to state reliably here, so check with your card issuer and, for tax refunds, with the retailer directly before you rely on a number from any source, including this one.