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

Complete
Ireland → Oslo, Norway
Item Name Destination Amount Conditions
Meal & Lodging Oslo, Norway 2040.5 NOK per night Overnight rate covering accommodation and three meals for a 24-hour absence abroad on official business.
Vouched Accommodation (VA) Rate Oslo, Norway 1020.25 NOK 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 Oslo, Norway 680.17 NOK per day Ten-hour rate: applies to an absence abroad of ten hours or more without an overnight stay.
Daily allowance Oslo, Norway 340.08 NOK 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.