Hi Rosa, So our Payroll product is heavily tested so it rarely throws up a bug. I think twice in the past 5yrs, and they were for fringe cases. Any issue we've had has been over manual creation. This gets compounded by the pay Revenue take tax, tax allowances and thresholds that's why you can get spikes in salary tax. Either way you'll need to contact Revenue, then let us know what they said and we'll have a look. But it's 100% of the time manual errors from employees created manually. It's tricky so it happens. Good work on only using the P2C file. I think we might end up hiding the manual entry next year. The P2C is efficient and always correct, why add the hassle! Let me know what revenue say. I then start with checking the entries that the manual employees have against what revenue say. You can also get issues where someone's tax wasn't done correctly in a previous job and then their tax this year gets bumped up, wrong USC rate etc. Anyway let me know what Revenue say and we'll have a look.