It is important to avoid being put on emergency basis of tax in a situation where you have a job or pension and you take up a second job.
Your first employer will already have instructions from Revenue, which gives you all the Tax Credits and Standard Rate Cut-Off Point (SRCOP) to which you are entitled. Unless you advise Revenue to issue new certificates, one to each employer, allocating the Tax Credits and SRCOP between the two employments, as required by you, your new employer is obliged to deduct tax on the emergency basis, when paying wages or salary.
This will mean that you will benefit from more tax credits than you are entitled to, resulting in an underpayment of tax, which will have to be paid by you at the end of the tax year. Therefore it is essential to notify Revenue immediately on taking up a second employment in order to get a Tax Credit Certificate issued to each employer.
You can ring Revenue PAYE help line on 1890 777 725
Any queries on same give me a call on 091 763817 or email me at oliver@taxreturnhelp.ie