Electronic Monthly and Weekly Tax Deduction Cards (TDC) are available on the Revenue website.

The electronic TDC replaces the paper Tax Deduction Card (TDC) that previously issued to some employers. On receipt of an employee's Tax Credit Certificate an employer need only enter the annual Tax Credit amount and Standard Rate Cut-Off Point shown on the Tax Credit Certificate into the electronic TDC to calculate an employee's weekly or monthly amounts of Tax Credits and Standard Rate Cut-Off Point. The TDC can be printed or saved locally on the PC for safe storage.

For full details see: http://www.revenue.ie/en/business/paye/e-tax-deduction-card.html