The deadline to lodge a tax return depends on your country and specific circumstances. For Australia, the standard due date for individuals and trusts is October 31, 2025, unless you are using a registered tax agent, in which case deadlines may be extended. If lodged personally, the deadline is October 31; through a tax agent, you may have a longer window into 2026.

In the UK, the deadline for self-assessment tax returns is usually January 31 following the end of the tax year, which runs from April 6 to April 5. For example, for the tax year ending April 5, 2025, the deadline is January 31, 2026.

In the UK, you must send your self-assessment tax return by January 31 after the tax year ends to avoid penalties.

Please specify your country if you need more precise information.