https://help.gosimpletax.com/hc/en-gb/articles/207652843-Using-SimpleTax-A-Complete-Guide-SA100
Create an account with SimpleTax by entering your details and creating a password on the signup page:
Select your estimated income and the Personal Tax Return option
Select from the list the type of Income you receive. In this case we have used Property Income
A quick tour will show you the main features of creating your return:
Choose the appropriate category and then enter the values on the appropriate lines.
Before submission update your personal details:
Do not forget to enter your UTR number.
Then Subscribe for your account.
You can add other users on your account and submit for them (Click here to read more on how to do this)
Then VALIDATE your Tax Return
Answer a few final questions before submitting your return on the ALMOST THERE PAGE:
We need to validate your ID by sending you a code via text:
Enter the code and submit your return:
We will then confirm your submission: