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

Complete
United Kingdom → Ninh Binh, Vietnam
Item Name Destination Amount Conditions
Meals Hanoi, Vietnam 18 USD per day Over 5 hours rate: covers subsistence expenses for a period of more than 5 but less than 10 hours, measured by reference to the times of arrival in and departure from the foreign country.
Meals Hanoi, Vietnam 74 USD per day Over 10 hours rate: covers subsistence expenses for a period of more than 10 but less than 24 hours, measured by reference to the times of arrival in and departure from the foreign country.
Meals and incidentals Hanoi, Vietnam 85.5 USD per day 24 hour rate: covers the total cost of meals and daily hotel-to-office travel for a full 24-hour period.; The actual room rate is paid in addition to this amount (source shows the rate as 'plus room rate').
Lodging Hanoi, Vietnam 154.5 USD per night No specific conditions
Breakfast Hanoi, Vietnam 0 USD per meal This amount is included in the room rate, so it is not paid separately on top of the lodging rate.
Lunch Hanoi, Vietnam 12.5 USD per meal No specific conditions
Dinner Hanoi, Vietnam 51 USD per meal No specific conditions
Incidentals Hanoi, Vietnam 4 USD per day Source row labelled 'Other': other expenses incurred during the day; employers may use the individual meal and other rates instead of the over 5 hour, over 10 hour and 24 hour rates.
Drinks Hanoi, Vietnam 10.5 USD per day No specific conditions
Transport Hanoi, Vietnam 7.5 USD per day Covers daily travel between the employee's hotel and office.
Total residual Hanoi, Vietnam 85.5 USD per day Total residual rate: intended to cover the total cost of meals in a period of 24 hours plus the cost of daily travel between the employee’s hotel and office; the 24 hour rate is the sum of the room rate and this total residual rate.
Meals Ho Chi Minh City, Vietnam 41.5 USD per day Over 5 hours rate: covers subsistence expenses for a period of more than 5 but less than 10 hours, measured by reference to the times of arrival in and departure from the foreign country.
Meals Ho Chi Minh City, Vietnam 88 USD per day Over 10 hours rate: covers subsistence expenses for a period of more than 10 but less than 24 hours, measured by reference to the times of arrival in and departure from the foreign country.
Meals and incidentals Ho Chi Minh City, Vietnam 97 USD per day 24 hour rate: covers the total cost of meals and daily hotel-to-office travel for a full 24-hour period.; The actual room rate is paid in addition to this amount (source shows the rate as 'plus room rate').
Lodging Ho Chi Minh City, Vietnam 134 USD per night No specific conditions
Breakfast Ho Chi Minh City, Vietnam 0 USD per meal This amount is included in the room rate, so it is not paid separately on top of the lodging rate.
Lunch Ho Chi Minh City, Vietnam 37.5 USD per meal No specific conditions
Dinner Ho Chi Minh City, Vietnam 42.5 USD per meal No specific conditions
Incidentals Ho Chi Minh City, Vietnam 0 USD per day Source row labelled 'Other': other expenses incurred during the day; employers may use the individual meal and other rates instead of the over 5 hour, over 10 hour and 24 hour rates.
Drinks Ho Chi Minh City, Vietnam 8 USD per day No specific conditions
Transport Ho Chi Minh City, Vietnam 9 USD per day Covers daily travel between the employee's hotel and office.
Total residual Ho Chi Minh City, Vietnam 97 USD per day Total residual rate: intended to cover the total cost of meals in a period of 24 hours plus the cost of daily travel between the employee’s hotel and office; the 24 hour rate is the sum of the room rate and this total residual rate.

Source URL:
https://www.gov.uk/guidance/expenses-rates-for-employees-travelling-outside-the-uk
This source provides official travel rate information from gov.uk.