MCN23 N

Hi, apologise if this is not the correct way to post a question. In Job A (main job) earnings are £38,000 With normal allowance and tax code and taxted at 20%. Job B (Private Pension) is £20,000 takes us into 40% bracket. Tax code DO has been assigned meaning the whole amount will be taxed at 40% even though £12,000ish (round up/down) should still be charged at 20% and only the remaining £8,000 should be taxed at 40%. Should also point out that on last 3 Pension payslips they have actually taken 50% tax. I know you cant discuss individual codes. But just trying to understand how it works. thanks