Basic question regarding new Limited Co and tax

[hobnob]

Or do I need to do a Personal return for invoices during the period before company (Apr - Aug) and then also a company return for company invoices Aug-Apr?

Following up on what jamesbrown said, your personal tax year runs from Apr-Apr, while the company's tax year will run from Sep-Aug. That means that you'll still need to do a SATR as normal after Apr 2025, which includes any sole trader income and any income you get from the limited company (salary/dividends). Your company will also have to submit its own year end accounts after Aug 2025, and you'll need an accountant to help you with that.

[hobnob]

Why don't you have an accountant?

In fairness, that would be a bit premature if the company doesn't exist yet (and won't exist for another 6 months).

[northernladuk]

In fairness, that would be a bit premature if the company doesn't exist yet (and won't exist for another 6 months).

That's fair but finding one and getting some advice upfront on the promise of business from August could save him time and problems.