IRS Notice 2017-54 lists the new per diem rates that can be used to substantiate business travel expenses.
(This is similar to the "standard mileage rate" that can be used by qualifying taxpayers for business vehicle expenses.)
The new rates effective October 1, 2017 for lodging, meals & incidental expenses are:
$284 for high-cost localities and $191 for other localities (high-low cost method.)
The high-low meals-only rates are $68 and $57.
Caution: Not all taxpayers can use the high-low method. Give me a call to discuss your particular situation before taking any action on this information.
The excruciating details are available at https://www.irs.gov/pub/irs-drop/n-17-54.pdf