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Please see for reference IRS publication 463 - http://www.irs.gov/pub/irs-pdf/p463.pdf
If your assignment or job away from your main place of work is temporary, your tax home does not change. You are considered to be away from home for the whole period you are away from your main place of work. You can deduct your travel expenses if they otherwise qualify for deduction. Generally, a temporary assignment in a single location is one that is realistically expected to last (and does in fact last) for 1 year or less.
However, if your assignment or job is indefinite, the location of the assignment or job becomes your new tax home and you cannot deduct your travel expenses while there. An assignment or job in a single location is considered indefinite if it is realistically expected to last for more than 1 year, whether or not it actually lasts for more than one year.
You can deduct ordinary and necessary expenses you have when you travel away from home on business. This table summarizes travel expenses you may be able to deduct.
You may have other deductible travel expenses that are not covered there, depending on the facts and your circumstances.You generally might deduct transportation expenses to and from WA, lodging and daily meals and incidental expenses (M&IE) - Per Diem.You need to subtract all expenses provided or paid or reimbursed by your employer if these weer not included into your wages.