Working for a US Company

I have been self employed (LTD) for 20 years, I have been doing some work for a US company for the last 8 months and they have offered me a job. Do I need to use an umbrella company for this as they are US based? I ideally want to close down my business and work for them rather than for myself.

Hi,
 

No. You can show this as self employment. If they deduct tax in the US, you will also show it as foreign income in order to claim foreign tax credit relief  . Thank you.

But should I NOT want to be self employed, and work for the company to make it easier to get a mortgage = would I need an umbrella company?

Hi Davo1975,
You do not need an umbrella complany to work as an employee of an overseas company in the UK.
If you work for a non UK employer, you will be in receipt of overseas employment income and this would need to be declared in SA102 and SA106 of a Self Assessment tax return, so that UK tax can be calculated on the employment income.
Thank you.