Blog > Windows 8.1 or earlier no longer supported by HMRC for MTD VAT submissions
From 7 May 2024, HMRC removed support for CBC ciphers (ciphers are a method of encrypting transmitted data). As a result of this, Windows 8.1 or earlier cannot be used to submit MTD for VAT returns to HMRC.
Any users who are using Windows 8.1 and who wish to submit MTD VAT returns to HMRC, will need to upgrade their PC/operating system to Windows 10 or 11.
Windows 8.1 is an old version of Windows so this change is unlikely to affect most users.
If you are unsure which version of Windows you are using, you can check this by following the steps at Check Windows version.
