Tax Deductible Expenses

[Dalton Dellinger]

Hello BP! So I was creating a spreadsheet to track all my business expenses. 

Is my phone bill tax deductible since I use it for business purposes? 

I offer internet to my downstairs tenant for free (I am house-hacking in an up-down duplex), and I also run my businesses out of my home office. Is my internet bill at least partially tax deductible?

I had security cameras installed on the premises, is that considered tax deductible as well?

Thank you all for the help!