In a rare move to simplify life for taxpayers, the IRS has created a new simplified optional home office deduction. The simplified home office deduction can be claimed on 2013 tax returns which are filed in 2014. You can't claim the simplified deduction on 2012 returns, which are filed in 2013.
Using the optional method, you simply deduct $5 for every square foot of your home office. However, the deduction is capped at $1,500 per year; so it can only be used for offices up to 300 square feet.
For more information, see the IRS website.