VAT Domestic Reverse charge and VAT refund on materials (CIS)

Hello, I am subcontractor CIS and VAT registered Limited Company Am I doing everything correct? I do work for contractor (who is not end client and is VAT and CIS registered also). Work is £2000 total, £1000 Labour + £1000 Materials, I send him invoice for £2000 (do not have to break down which part is labour which is materials) with 0% VAT and with"*Domestic reverse charge applies" on the invoice. I Buy materials, keep the receipts/invoices, do the work, than ask for 20% refund VAT for materials from HMRC and get 200£ refunded from this 1000£. Correct? if no, please explain what I did wrong if yes, do I pay corporate tax on this 200£ VAT refunded? Thank you

Hi Alexander Koselev,
You have decribed this process correctly.
You are charging no VAT on your total supply but leeting your business customer know that they must account for the VAT using the reverse charge procedure.
The VAT on the materials you purchase is your input tax and is claimable as long as conditions are met below:
10. Introduction to input tax
Please speak to Corporation Tax on your other query
Corporation Tax: general enquiries
Thank you.