You should register only when you start trading unless you need to prove you’re self-employed, for example to claim Tax-Free Childcare you want to make voluntary Class 2 National Insurance payments to help you qualify for benefits. Please see link
When you register as self-employed for Self Assessment, you are registering your business. So you don't have to register again. You do not need to register if you earned £1000 or less from self-employment in the tax year unless you need to prove you're self employed, for example to claim free childcare or you want to make voluntary Class 2 National Insurance payments to help you qualify for benefits.
Please see the below link to the relevant page on our website.
Hi im taking over my brothers accounts for his Limited company he set up earlier this year, I invoice the clients and they deduct tax at 20%, I also pay the men or sub-contractors and deduct 20% - ive logged online HMRC CIS but his accountant isnt doing his job and he now owes quite a lot of money, how do i go about offsetting the tax hes had deducted please is this under the Self Assessment at the end of the year or can it be done monthly in line with the EPS due on the 5th please?
A limited company subcontractor can claim CIS deductions suffered, in year against their PAYE liabilities. To do this the company needs to send an Employment Payment Summary (EPS) by the 19th of the month showing the amount of CIS deductions suffered. HMRC will then take the CIS deductions from what is owed in PAYE and National Insurance, any balance of PAYE and NI will be due by the usual date. If you still have CIS deductions to claim back once you have reduced your PAYE bill to zero, carry these forward to the next month or quarter. You need to keep a record of any amounts set against your PAYE liabilities and can do this on a form CIS132 .
More information on how to pay tax and claim back deductions as a subcontractor can be found on Gov.uk here:
If you are unable to claim back your CIS deductions in year you can make a claim after the end of the tax year and HMRC will refund any overpayment to you or you can ask HMRC to set the repayment against other liabilities such as Corporation Tax.
You can find out how to claim a refund of CIS deductions if you’ve paid too much tax or National Insurance, after the end of the tax year here: