20 September 2026 Latvia UIN (corporate income tax) Latvia: monthly corporate income tax (UIN) declaration due by the 20th when profit is distributed Recurring 20 September 2026 Latvia PVN – EU supplies recapitulative statement Latvia: report on supplies of goods and services within the EU due by the 20th Recurring 20 September 2026 Latvia PVN (VAT) return Latvia: VAT (PVN) return and payment due by the 20th Recurring 15 October 2026 Latvia micro-enterprise tax (MUN) Latvia: micro-enterprise tax (MUN) quarterly declaration due by the 15th Recurring 17 October 2026 Latvia self-employed VSAOI/IIN Latvia: self-employed person's quarterly VSAOI/IIN report due by the 17th Recurring 20 October 2026 Latvia UIN (corporate income tax) Latvia: monthly corporate income tax (UIN) declaration due by the 20th when profit is distributed Recurring 20 October 2026 Latvia PVN – EU supplies recapitulative statement Latvia: report on supplies of goods and services within the EU due by the 20th Recurring 20 October 2026 Latvia PVN (VAT) return Latvia: VAT (PVN) return and payment due by the 20th Recurring 31 October 2026 Latvia / EU One Stop Shop (OSS) VAT Latvia: OSS quarterly VAT return due by the end of the following month Recurring 20 November 2026 Latvia UIN (corporate income tax) Latvia: monthly corporate income tax (UIN) declaration due by the 20th when profit is distributed Recurring 20 November 2026 Latvia PVN – EU supplies recapitulative statement Latvia: report on supplies of goods and services within the EU due by the 20th Recurring 20 November 2026 Latvia PVN (VAT) return Latvia: VAT (PVN) return and payment due by the 20th Recurring 2 December 2026 EU AI Act AI Act: end of grace period for marking AI-generated content in pre-existing systems; ban on non-consensual intimate deepfake generators 20 December 2026 Latvia UIN (corporate income tax) Latvia: monthly corporate income tax (UIN) declaration due by the 20th when profit is distributed Recurring 20 December 2026 Latvia PVN – EU supplies recapitulative statement Latvia: report on supplies of goods and services within the EU due by the 20th Recurring 20 December 2026 Latvia PVN (VAT) return Latvia: VAT (PVN) return and payment due by the 20th Recurring 24 December 2026 eIDAS 2 EU Digital Identity Wallet: every Member State must offer a wallet; public bodies must accept it 1 January 2027 Latvia micro-enterprise tax (MUN) Latvia: proposed simplified 10% micro-enterprise tax for individuals serving other individuals 12 January 2027 Data Act Data Act: cloud providers must stop charging switching and data-egress fees 15 January 2027 Latvia micro-enterprise tax (MUN) Latvia: micro-enterprise tax (MUN) quarterly declaration due by the 15th Recurring 17 January 2027 Latvia self-employed VSAOI/IIN Latvia: self-employed person's quarterly VSAOI/IIN report due by the 17th Recurring 20 January 2027 Latvia UIN (corporate income tax) Latvia: monthly corporate income tax (UIN) declaration due by the 20th when profit is distributed Recurring 20 January 2027 Latvia PVN – EU supplies recapitulative statement Latvia: report on supplies of goods and services within the EU due by the 20th Recurring 20 January 2027 Latvia PVN (VAT) return Latvia: VAT (PVN) return and payment due by the 20th Recurring 31 January 2027 Latvia / EU One Stop Shop (OSS) VAT Latvia: OSS quarterly VAT return due by the end of the following month Recurring 20 February 2027 Latvia UIN (corporate income tax) Latvia: monthly corporate income tax (UIN) declaration due by the 20th when profit is distributed Recurring 20 February 2027 Latvia PVN – EU supplies recapitulative statement Latvia: report on supplies of goods and services within the EU due by the 20th Recurring 20 February 2027 Latvia PVN (VAT) return Latvia: VAT (PVN) return and payment due by the 20th Recurring 20 March 2027 Latvia UIN (corporate income tax) Latvia: monthly corporate income tax (UIN) declaration due by the 20th when profit is distributed Recurring 20 March 2027 Latvia PVN – EU supplies recapitulative statement Latvia: report on supplies of goods and services within the EU due by the 20th Recurring 20 March 2027 Latvia PVN (VAT) return Latvia: VAT (PVN) return and payment due by the 20th Recurring 15 April 2027 Latvia micro-enterprise tax (MUN) Latvia: micro-enterprise tax (MUN) quarterly declaration due by the 15th Recurring 17 April 2027 Latvia self-employed VSAOI/IIN Latvia: self-employed person's quarterly VSAOI/IIN report due by the 17th Recurring 20 April 2027 Latvia UIN (corporate income tax) Latvia: monthly corporate income tax (UIN) declaration due by the 20th when profit is distributed Recurring 20 April 2027 Latvia PVN – EU supplies recapitulative statement Latvia: report on supplies of goods and services within the EU due by the 20th Recurring 20 April 2027 Latvia PVN (VAT) return Latvia: VAT (PVN) return and payment due by the 20th Recurring 30 April 2027 Latvia / EU One Stop Shop (OSS) VAT Latvia: OSS quarterly VAT return due by the end of the following month Recurring 20 May 2027 Latvia UIN (corporate income tax) Latvia: monthly corporate income tax (UIN) declaration due by the 20th when profit is distributed Recurring 20 May 2027 Latvia PVN – EU supplies recapitulative statement Latvia: report on supplies of goods and services within the EU due by the 20th Recurring 20 May 2027 Latvia PVN (VAT) return Latvia: VAT (PVN) return and payment due by the 20th Recurring 31 May 2027 Latvia annual report filing Latvia: annual report (gada pārskats) yearly filing deadline for micro and small companies Recurring 1 June 2027 Latvia personal income tax (IIN) — annual declaration Latvia: mandatory annual income declaration (gada ienākumu deklarācija) due 1 June Recurring 20 June 2027 Latvia UIN (corporate income tax) Latvia: monthly corporate income tax (UIN) declaration due by the 20th when profit is distributed Recurring 20 June 2027 Latvia PVN – EU supplies recapitulative statement Latvia: report on supplies of goods and services within the EU due by the 20th Recurring 20 June 2027 Latvia PVN (VAT) return Latvia: VAT (PVN) return and payment due by the 20th Recurring 9 July 2027 Instant Payments Regulation Instant Payments Regulation: sending instant euro payments and Verification of Payee mandatory for non-euro-area banks (Poland, Sweden, Czechia, etc.) 15 July 2027 Latvia micro-enterprise tax (MUN) Latvia: micro-enterprise tax (MUN) quarterly declaration due by the 15th Recurring 17 July 2027 Latvia self-employed VSAOI/IIN Latvia: self-employed person's quarterly VSAOI/IIN report due by the 17th Recurring 20 July 2027 Latvia UIN (corporate income tax) Latvia: monthly corporate income tax (UIN) declaration due by the 20th when profit is distributed Recurring 20 July 2027 Latvia PVN – EU supplies recapitulative statement Latvia: report on supplies of goods and services within the EU due by the 20th Recurring 20 July 2027 Latvia PVN (VAT) return Latvia: VAT (PVN) return and payment due by the 20th Recurring 31 July 2027 Latvia / EU One Stop Shop (OSS) VAT Latvia: OSS quarterly VAT return due by the end of the following month Recurring 20 August 2027 Latvia UIN (corporate income tax) Latvia: monthly corporate income tax (UIN) declaration due by the 20th when profit is distributed Recurring 20 August 2027 Latvia PVN – EU supplies recapitulative statement Latvia: report on supplies of goods and services within the EU due by the 20th Recurring 20 August 2027 Latvia PVN (VAT) return Latvia: VAT (PVN) return and payment due by the 20th Recurring