Self-Assessment, Tax return - Cash basis or not?

Hi ladies and gents :)

Need a question answered outright! Got a tax return to send back to HMRC, one question ask's are we Cash Basis or not?

Everything we do is paid for when an invoice is generated. Only free funding is paid partly, afaik?

My partner needs to know so we can get the forms sent back and done.

Thanks everyone :)

I do cash basis, it is the easy way I believe.