Just looked at my last few payslips and notice i'm on the wrong tax code. I'm on 647L same as my day job, so Im getting my tax allowance twice. Ive not paid tax on TA job when I should have so I now owe the tax man a couple of hundred quid. This is due to mobilising last year and after demobbing last May it seems my tax code wasnt changed back. Its also happened to some lads I went on tour with. Just advising those whose demobbed recently to have a check the tax code should start with BR. If your on the wrong tax code a simple call to the tax office will rectify the problem.