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

Complete
Ireland → LV
Item Name Destination Amount Conditions
Meal & Lodging Riga, Latvia 175 EUR per night Overnight rate covering accommodation and three meals for a 24-hour absence abroad on official business.
Vouched Accommodation (VA) Rate Riga, Latvia 87.5 EUR 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 Riga, Latvia 58.33 EUR per day Ten-hour rate: applies to an absence abroad of ten hours or more without an overnight stay.
Daily allowance Riga, Latvia 29.17 EUR per day Five-hour rate: applies to an absence abroad of between five and ten hours.
Incidentals All Other, Latvia 10 EUR per day Actual-cost destination (Note 1, Circular 07/2017): the overnight rate is the vouched cost of accommodation and three meals, the ten-hour rate is the vouched cost of two meals and the five-hour rate is the vouched cost of one meal, in each case plus this incidental expenses allowance of EUR 10 per day.; Applies to locations in Latvia other than those separately listed in Appendix 2 of Circular 07/2017.

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.