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

Complete
Ireland → San Luis Obispo County, California, United States
Item Name Destination Amount Conditions
Meal & Lodging San Luis Obispo County, California, USA 99.5 USD per night Paid in addition to the vouched cost of room; the amount shown is the supplement covering remaining meals and expenses for a 24-hour absence abroad on official business.; California (2) rate (Note 4, Circular 07/2017): covers the counties of Imperial, Kern, Orange, Riverside, San Bernardino (source spelling 'San Bernadino'), San Diego, San Luis Obispo, Santa Barbara and Ventura.
Vouched Accommodation (VA) Rate San Luis Obispo County, California, USA 99.5 USD 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.; California (2) rate (Note 4, Circular 07/2017): covers the counties of Imperial, Kern, Orange, Riverside, San Bernardino (source spelling 'San Bernadino'), San Diego, San Luis Obispo, Santa Barbara and Ventura.
Daily allowance San Luis Obispo County, California, USA 66.33 USD per day Ten-hour rate: applies to an absence abroad of ten hours or more without an overnight stay.; California (2) rate (Note 4, Circular 07/2017): covers the counties of Imperial, Kern, Orange, Riverside, San Bernardino (source spelling 'San Bernadino'), San Diego, San Luis Obispo, Santa Barbara and Ventura.
Daily allowance San Luis Obispo County, California, USA 33.17 USD per day Five-hour rate: applies to an absence abroad of between five and ten hours.; California (2) rate (Note 4, Circular 07/2017): covers the counties of Imperial, Kern, Orange, Riverside, San Bernardino (source spelling 'San Bernadino'), San Diego, San Luis Obispo, Santa Barbara and Ventura.

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.