Thanks for reaching out to us today, @userangie-clift04,
Our QuickBooks Self-Employed program for United Kingdom is preset to the tax year mandated by the HMRC. The cycle usually starts from April 6 - April 5 of next year. For now, changing the tax year within the program is currently unavailable.
You may visit the gov.uk website to get further information about this.
Being able to update the year manually would be handy for businesses using a different accounting period. We're taking not of this for review and we appreciate your time visiting us today.
If you have any questions or need further assistance with anything in QuickBooks, I'll be right here to help. Keep me posted in the comments below. Have a lovely week ahead!