Look up per diem reimbursement rates and mileage deductions for business travel worldwide.

Complete
Ireland → Baja California, Mexico
Item Name Destination Amount Conditions
Meal & Lodging Mexico City, Mexico 1034.5 MXN per night Paid in addition to the vouched cost of room, reimbursed at vouched actual cost per Appendix 2 of Circular 07/2017 (destination-specific accommodation figure carried in that appendix, not repeated here); the amount shown is the supplement covering remaining meals and expenses for a 24-hour absence abroad on official business.
Vouched Accommodation (VA) Rate Mexico City, Mexico 1034.5 MXN per night Vouched Accommodation (VA) rate: paid in addition to the vouched cost of accommodation. Per Note 2 of Circular 07/2017 the VA rate should not be routinely used except for travel to Brussels, where the vouched cost of room plus the VA rate applies to all officers on overnight visits.
Daily allowance Mexico City, Mexico 689.67 MXN per day Ten-hour rate: applies to an absence abroad of ten hours or more without an overnight stay.
Daily allowance Mexico City, Mexico 344.83 MXN per day Five-hour rate: applies to an absence abroad of between five and ten hours.

Source URL:
https://www.revenue.ie/en/employing-people/documents/dper-circular-07-2017-subsistence-allowances-abroad.pdf
This source provides official travel rate information from revenue.ie.