As of January 1, 2020, stamp duty must be paid to one common bank account:
Urząd Miasta Stołecznego Warszawy (The City of Warsaw)
Centrum Obsługi Podatnika (Taxpayer Service Center)
21 1030 1508 0000 0005 5000 0070
NIP (Taxpayer Identification Number) 525-22-48-481
For payment of stamp duty from abroad:
SWIFT CODE: CITIPLPX
IBAN PL 21 1030 1508 0000 0005 5000 0070
UNIT IN CHARGE:
Centrum Obsługi Podatnika (Taxpayer Service Center)
Ul. Obozowa 57
01-161 Warszawa