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The key dates every month and every year. A deadline that falls on a weekend or public holiday moves to the next working day.

Monthly deadlines (for the previous month)
Deadline	What and for whom
by the 15th	PPK contributionsemployers running an employee capital plan (PPK)
by the 15th	ZUS contributions and the ZUS declarationlegal persons: limited companies (sp. z o.o., S.A.), foundations, associations, cooperatives
by the 20th	ZUS contributions and the ZUS declarationsole traders, partnerships and other payers that are not legal persons (budget units: by the 5th)
by the 20th	Advance income tax (PIT, CIT, lump-sum tax)sole traders and companies
by the 20th	Tax withheld from salaries and contractsemployers and other remitters
by the 20th	PFRON contributionsemployers with at least 25 full-time employees
by the 25th	VAT and the JPK_V7 fileactive VAT payers (quarterly filers pay VAT after the quarter)

31 JanuaryPIT-11, PIT-4R and PIT-8AR to the tax officeemployers and other remitters
31 JanuaryZUS IWA (accident insurance information)payers insuring at least 10 people
end of FebruaryPIT-11 to employees and contractorsemployers and other remitters
31 MarchCIT-8 annual return and financial statements drawn upcompanies and others keeping full accounts
30 AprilAnnual returns (PIT-36, PIT-36L, PIT-28) and tax paymentsole traders and partners in partnerships
20 MayAnnual health contribution settlement (ZUS declaration for April)sole traders on the tax scale, flat rate or lump-sum tax
30 JuneApproval of financial statements (then 15 days to file with the KRS)companies and others keeping full accounts

These are general deadlines - yours may differ, e.g. with quarterly settlement or a non-calendar tax year. If in doubt, ask us.