Per Diem deductions

[Jjmanddr]

For 2019 I worked as an aerospace contractor in a different state than which I live.   From the contract house, I did receive a W2 from them and did receive a small amount of non-taxed per Diem every week.   My question is if the published per Diem rates for the  city were $150 per day for example, but the contract company only gave me $50 per day of per Diem,  would I not be able to claim that remaining $100 as a deduction? 

[NCperson]

do you have receipts to support the deduction? if so, then yes.  if not, then no.