I am considering a job change. I would live in Texas but work remotely for a Washington based company. How would this affect my taxes?

[xmasbaby0]

Neither Texas nor Washington has a state income tax.   You would just continue to file a federal tax return like you have been doing.

[SweetieJean]

Nether TX nor WA has a state income tax.  But did you mean Washington, DC?

But note that, if you are a W-2 employee, you cannot deduct any home office or related expenses.

[espinozajesus394]

Yes Washington state. They also have a separate office in Idaho which could be where I would be located if I were to be onsite? Do you know if this would also make a difference? 

[Hal_Al]

You would owe ID tax on your wages for the days you worked in ID.  You would file an ID non resident return. 

See http://money.cnn.com/2013/06/28/pf/taxes/business-traveler-tax-threat/  

[espinozajesus394]

And if I was given option to work from home in Texas throughout the year how would this affect taxes? 

[Hal_Al]

If you  work from home in Texas throughout the year, you would pay no state taxes.

[Sblavo]

What about if it WAS DC. What would be the tax implications if I choose to establish domicile in TX but work in DC?

[ThomasM125]

You would have to pay tax to Washington DC on the income you earned while working there.