"i have an additional salary that i pay tax and NI on via paye as well as my self employed income, can i add this to my quickbooks as it will affect the amount of tax i pay?"

It's a pleasure to have you here, @ajhealey123-gmai. I'm here to provide some insights about adding your salary and Paye earnings.

QuickBooks Self-Employed is outlined to track your self-employment income and expense as the basis for calculating your self-assessment. This version of QuickBooks is unable to calculate PAYE earnings. Although you can enter it on the Tax Profile page, I suggest reaching out to a tax accountant for some guidance.

To properly enter and track your salaries and owner’s draw, you may want to consider switching over to QBO Payroll. You can sign up for a 30-day free trial or access the sample company to see how QuickBooks Online works.

Please visit this website for more information: https://quickbooks.intuit.com/uk/online/.

You can also check this article about QuickBooks Self-Employed UK Tax Profile Set Up for more information.

Keep me in the loop if you need more help with managing your taxes in QuickBooks. I'll be happy to always to assist you. Stay safe always.