I bought an rv and use it to travel for work i take the standard per diem deductution i am paying monthyl payments for my rv can i decuct any of that

[KittyM]

Yes, you may!  If you itemize your return, you can take the interest as a mortgage interest deduction on Schedule A of your return as a second home if you do not already have a second home.  If you are taking per diem travel expenses, they will cover your food and lodging costs. 

I have highlighted the relevant portion of the Schedule A instructions below and included a link to the full instructions if you are interested in researching further on your own.

https://www.irs.gov/pub/irs-pdf/i1040sca.pdf 

[TaxGuyBill]

They can take the Meal Per Diem, but any business deductions for Lodging needs to be Actual Expenses.

The business Actual Lodging Expense would possibly include the interest, so you could not enter it as BOTH business and personal mortgage interest for the same time period (double-dipping).