This is on Revenue website. Unfortunately the figures relate to 2010 so would need some adjustment
http://www.revenue.ie/en/personal/faqs/how-do-i-work-out-my-tax.html#section5
Example 2
David is a PAYE employee. He is married and his wife is not employed outside the home. He is entitled to the following tax credits and standard rate cut-off point in 2010:
David's tax credits
Tax CreditsMarried Person's Tax Credit3,660
Employee (PAYE) Tax Credit1,830
Home Carer tax Credit900
Service Charges80
Trade Union Subscriptions70 Per year
6,540 per year (125.77 per week)Standard Rate Cut-Off Point45,400 per year (873.08 per week)
A Tax Credit Certificate showing these tax credits and standard rate cut-off point, issued to David. His employer received notification of the total amounts.
David earns €750 per week. His weekly figure of tax is calculated as follows:
David's weekly taxStepTaxable Pay €750
1Tax @ 20%€750€150.00Apply standard rate 20% up to a maximum of the standard rate cut-off point (€873.08) as advised by Revenue in the tax credit certificate
2Tax @ 41%NilNilAs David's weekly earnings (€750) are below his weekly standard rate cut-off point (€873.08), he will not pay tax at the higher rate of 41% this week
3Gross Tax€150.00Add the figure of tax due at standard rate to the figure of tax due at the higher rate (if any)
4Less Tax Credit(€125.77)Tax credit advised by Revenue in the Tax Credit Certificate Net tax payable by David this week€24.23Gross tax less tax credits.