Tax Implication: Resident alien on a British work contract

This is a question of tax law, not so much immigration.

How can and long is the process for my wife who is a US Citizen to petetion her mother and 4 siblings who are under 21?

She may petitioner her mother and each sibling. The mother would be coming to the US within approximately one year, but the siblings will take...

Can I apply for Green Card Lottery if I am in the process of getting my H1B visa I am in the Request for Evidence stage

Submitting a DV Lottery application should have no impact on any H-B Petition.

It should be for your child born abroad.

I am on F2 status and my husband's status is changing from F1 to H1 on Oct 1st. Am I safe if I apply for COS to H4 before Oct1st

Yes, you can do it yourself on-line by following the instructions at www.uscis.gov.

I am present working on H1B(expiry on Oct, 2014) for company A. I just got my H1B transferred to comp B.Do i need an extensn?

This depends on whether you are talking about an extension of status and/or an extension of stay only.

Change in H1 status requires new visa stamping for H4 holder who has never entered USA, while has H4 stamp of previous company?

You can use the existing visa, but must be prepared to explain and document your wife's change of jobs.

How long does it take NVC to invoice a DS 260? I paid my AoS and it says "PAID" but my foreign wife's still says "NOT INVOICED"

It should not take more than two weeks.

Wife 's green card (earlier h4 visa holder) & husband 's GC (earlier h1b holder), will be conditional or permenant?

Only marriage- and investor-based immigrant petitions result in conditional residents status.

Citizenship application and immigration

The form requests a lot of background information.