[ElBarto]

It's not more complicated or more expensive to form a company.

For a Saas trading as a sole trader does not make much sense to me, as you are personally responsible, not a company. And you'll likely want to move to a company sooner than later, anyway.

[chdaniel]

That goes without saying, yes.

Dude asked for the leanest version, that'd be it — I'd go sole trader and have it legal, all while seeing whether the SaaS lifts itself off the ground or not

[ElBarto]

>That goes without saying, yes.

It's arguably not the leanest, then.

IMHO, with payments processing to be setup and legal liabilities it is a good idea to completely separate that from your personal finances. On a more subjective note, it also projects a more profesional image.

It would be good if Jackypot would reply to comments so we could understand what is his issue with setting up a company.

Note, btw that it is not accurate to say that for a sole trader profits up to £12.5k are untaxed as this is the "personal allowance": This amount relates to your personal income as a whole.