A lot depends on where you will be employed. Will you remain an employee of the same company in Ireland or will you be working for a company registered in Switzerland? If the former, you will be paid as an Irish employee , subject to Irish tax law, or if the latter, a Swiss employee, subject to Swiss tax law.
If you are employed in Switzerland you will pay income tax from the start of your employement there with no further liability to Irish tax law (under double taxation treaty). You may also be entitled to some rebate of tax paid in Ireland this year as your employer would have been aportioning your tax credits over the full year, whereas you did not work the full year (so have unused credits to offset against income to date of cessation of employment in Ireland).
I am not an accountant but have worked in Switzerland-but did not pay tax there. I worked for an Int Org, but some some consultants we employed were obliged to pay tax in their home country as that was their place of employment.