Most of the KF.c community probably know this but just in case you don't. You can write off the cost of your internet and computers, if you itemize your deductions and if you do any financial work on your computer and over your internet. Such as email your accountant, check your portfolio, check your bank account or any other financial activity. This also applies to doing your taxes, or sending information about your taxes to an advisor, or bank.
While I am on the topic of taxes. You know the giant safe you bought to keep all of your firearms locked away? Well if you have a safe and you keep important financial records in that safe it can be written off on your taxes. Like I said in the beginning of this post, most of you probably know this already, but ask your tax advisor.