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You would get a copy from your employer if you misplaced the one issued to you.
If your employer does not give you a P60 at the end of each year you should contact your tax office. Revenue can contact your employer to obtain your P60 for you.
Only an employer can issue a P60. It can be provided to you either in electronic format or in hard copy. However, Revenue can provide you with details of the pay and tax for the year in question as returned by your employer, which Revenue has on file.