Self employed - self assessment expenses

rayc333_2

I'm hesitating to file my first ever self-assessment because I can't find info on how to deal with expenses reimbursed to me directly in my 'pay' for each job.  The Gov tax site asks for total turnover right at the beginning - should I simply deduct my expense payments from the total I've invoiced?
For other expenses like public transport costs (that I buy out of my pay to do each job) I understand that they are covered by the 'allowable expenses' section. Thanks.

rayc333_2

*I've been invoiced.

DullGreyGuy

No, your turnover is your total amount you've billed your clients (or been paid by your clients if you are doing cash accounting). Your expenses are entered as a separate line later and equally could be billed or paid depending on if you are accrual or cash accounting.