@real4uk , welcome to the USA and hoping this will be a great foreign assignment for you ( as mine was assigned to UK 35 years ago ).
For your W-4 , your filing status is Married Filing Joint ( MFJ ) -- this gives you the best tax outcome , generally. My assumptions here are : (a) you and your wife agree to file together and therefore are subject to your world income ( including her world income ) once you become Resident for Tax purposes --- pass the Substantial Presence Test ; (b) you are both citizen of another country ( UK ?); (c) You have US employment and your wife does not/will not have US income ( because she has a dependent visa not good for employment in the USA); (d) you both have a tax id valid in the USA ( you with SSN and she with SSN or ITIN )
Is there more I can do for you ?
