| April 2026 |
| 10 Apr 2026 Friday | Commercial tax and specific goods tax payment for March 2026 | Calculated from the statutory deadline | |
| May 2026 |
| 10 May 2026 Sunday | Commercial tax and specific goods tax payment for April 2026 Falls on a Sunday. IRD may move it to the next working day. | Calculated from the statutory deadline | |
| June 2026 |
| 10 Jun 2026 Wednesday | Commercial tax and specific goods tax payment for May 2026 | Calculated from the statutory deadline | |
| 30 Jun 2026 Tuesday | Income tax return, annual salary statement and annual commercial tax return for 1 April 2025 to 31 March 2026 (FY2025-26) | IRD notice of 28 April 2026 | |
| July 2026 |
| 10 Jul 2026 Friday | Commercial tax and specific goods tax payment for June 2026 Corporate income tax advance payment (April–June 2026 quarter) Specific goods tax quarterly return (April–June 2026) | Calculated from the statutory deadline | |
| 31 Jul 2026 Friday | Commercial tax quarterly return (April–June 2026) | Calculated from the statutory deadline | |
| August 2026 |
| 10 Aug 2026 Monday | Commercial tax and specific goods tax payment for July 2026 | Calculated from the statutory deadline | |
| September 2026 |
| 10 Sep 2026 Thursday | Commercial tax and specific goods tax payment for August 2026 | Calculated from the statutory deadline | |
| October 2026 |
| 10 Oct 2026 Saturday | Commercial tax and specific goods tax payment for September 2026 Corporate income tax advance payment (July–September 2026 quarter) Specific goods tax quarterly return (July–September 2026) Falls on a Saturday. IRD may move it to the next working day. | Calculated from the statutory deadline | |
| November 2026 |
| 2 Nov 2026 Monday | Commercial tax quarterly return (July–September 2026) | Shown on IRD calendar; the statutory date of 31 October is a Saturday | |
| 10 Nov 2026 Tuesday | Commercial tax and specific goods tax payment for October 2026 | Shown on IRD calendar | |
| December 2026 |
| 10 Dec 2026 Thursday | Commercial tax and specific goods tax payment for November 2026 | Calculated from the statutory deadline | |
| January 2027 |
| 10 Jan 2027 Sunday | Commercial tax and specific goods tax payment for December 2026 Corporate income tax advance payment (October–December 2026 quarter) Specific goods tax quarterly return (October–December 2026) Falls on a Sunday. IRD may move it to the next working day. | Calculated from the statutory deadline | |
| 31 Jan 2027 Sunday | Commercial tax quarterly return (October–December 2026) Falls on a Sunday. IRD may move it to the next working day. | Calculated from the statutory deadline | |
| February 2027 |
| 10 Feb 2027 Wednesday | Commercial tax and specific goods tax payment for January 2027 | Calculated from the statutory deadline | |
| March 2027 |
| 10 Mar 2027 Wednesday | Commercial tax and specific goods tax payment for February 2027 | Calculated from the statutory deadline | |