If you are an employee of a limited company receiving a PAYE salary and taxes and NI being deducted then IR35 does not apply. However, many mid to large corporate companies are dictating that inside IR35 roles can only be fulfilled via an umbrella organisation. Some smaller end clients may be OK for you to carry on using your limited company for inside IR35 as long as you can show all your income is going through PAYE but unfortunately this pragmatic approach isn’t very widespread at the moment.
Speak with an IR35 expert