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

Complete
Ireland → GI
Item Name Destination Amount Conditions
Meal & Lodging Gibraltar 190 GIP per night Overnight rate covering accommodation and three meals for a 24-hour absence abroad on official business.
Vouched Accommodation (VA) Rate Gibraltar 95 GIP 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 Gibraltar 63.33 GIP per day Ten-hour rate: applies to an absence abroad of ten hours or more without an overnight stay.
Daily allowance Gibraltar 31.67 GIP 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.