You're not doing it right HZ , others will disagree but there was always a disagreement with ,say , employing others and/or expenses.
If you are sub-contracting to a builder ,say, your invoice should present him with the amount of YOUR labour which is subject to 20% tax deduction .
Materials, travel, expenses are all lumped together in another column . HE DOES'NT STOP TAX ON YOUR EXPENSES.
And the biggest thing of all is.......HE MUST GIVE YOU SOME KIND OF STATEMENT SHOWING YOUR DEDUCTION FOR EVERY INVOICE.
I know of numerous subbies , chippies , brickies, who had no statements showing tax stopped, the guy, often an agent or ganger ,dissapears and they are made to pay the tax again because the guy stopped it from their money but never paid it on to HMRC.
I had a constant argument with main contractors , because I employed two subbies but would only present MY OWN labour for CIS tax . Their labour was in with my exes and materials . I would then deduct their tax when I paid them .
Thing is , theres a contract between me and the main contractor and he stops MY tax but has no right or obligation to stop tax from someone subbing to ME ( They're working for me not him )
Many guys in construction , some painters I know of, were paying the tax twice , then saying there was some airy fairy system of claiming it back at year end .
Many don't agree with me , but I've elected to be removed from the stupid system now but you need to think about it , especially the statements from Builder.