If You received a 1099-MISC you do need to include it in your tax return and it's fully taxable. If it was a reimbursement from your employer, it should have been included in your W-2. However, some employers issue a separate form to report travel reimbursement.
See the following link for a response to a previous thread by @KathrynG3
https://ttlc.intuit.com/community/after-you-file/discussion/a-portion-of-my-income-on-1099-misc-is-r...
