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Can I claim a tax deduction for working from home as an employee? I work there 90% of the time
The short answer is yes you probably can take the deduction for a home office because the space is used exclusively and you are working there for the convenience of your employer if you don't have a desk at your employers office. The long answer is that it may not be worth it to take the home office deduction as an employee. You're deduction is subject to a 2% AGI floor. You can only deduct a percentage of your rent or the depreciation on your home. A quick and dirty example if you make $75k/year, rent a 1200 sqft 2 bedroom apartment for $1000/month and use one bedroom (120 sqft) regularly and exclusively for your employer. You can deduct 10% (120sqft/1200sqft) of the $12000 ($1000*12 months (assumes your situation didn't change)) in rent or $1200. However because you are an employee you are subject to the 2% AGI floor so you can deduct $1200-$1500 (75000*.02 (salary * 2% floor)) = -300 so in order to deduct the first dollar you need an additional $300 worth of deductible expenses.  Depending on your situation it may or may not be worth it to take the home office deduction even if you qualify for it.