Re: False information
If you're actually spending significant sums on equipment, there is no way you are inside IR35 and you should not be in that contract. If you're inside IR35 you don't need an accountant.
Outside IR35 I was taxed at a lower rate by being able to employ my spouse as a director (they don't have another paid job). That effectively doubles all the tax rate thresholds, and makes a big difference. I'm now forced inside IR35 and have put my rate up by 36%. Luckily this client has agreed, but the next one may not.