How To Register Yourself As Self Employed
If you are new to self-employment you must register with HMRC for a UTR (Unique Tax Reference) number to confirm you are eligible to work in this manner.
If you fail to register within three months of taking up your first assignment you may incur a penalty of £100. If you do not register at all you will be breaking the law and could be liable for further penalties.
To register you must complete the following forms:
FORM CWF1 – Becoming self employed and registering for National Insurance and/or tax
FORM CA5611 – Application to pay National Insurance contributions by direct debit
These forms can be obtained through the HMRC website (although the direct links are above) . If you need assistance with registration call the National Insurance helpline number on 0300 200 3505.