If this seems overly-complicated, don't feel bad. We've had reports here of US based CPA's who made a mess of these instructions.
Just read through that IRS section.....might have to do it a few million more times. But what I took away was that I can switch back and forth for a particular year. Maybe I am just mixing things up.....definitely need to go through it again. But what I am reading is that we can change, but my wife would need to "revoke" her filling with me as joint by submitting a note saying she was doing so. Below are a couple of cut+pastes from http://www.irs.gov/pub/irs-pdf/p519.pdf page 9
You must file a joint income
tax return for the year you make the choice, but
you and your spouse can file joint or separate
returns in later years
You have an NRA spouse, and file jointly thereby "electing" for the NRA spouse to be treated as a US resident and a US Person. If you later decide to file as married separately (with the NRA spouse NOT filing a US 1040 return), then you must file a "revocation of election" for the NRA spouse to NOT be treated as a US resident/US Person. You may only do this once (elect/de-elect) with this particular spouse.
What the wording above means is that if the NRA spouse has elected to be treated as a resident/US Person, you may then file MFS or MFJ, but the catch is
both must file a US 1040 return every year the election is in place. One
can not file MFJ one year, and then the following year one file MFS and the NRA not file, and then the following year, both file MFJ again if the election has not been revoked (except for certain circumstances such as divorce or death).
1.
Revocation.
Either spouse can revoke
the choice for any tax year, provided he or
she makes the revocation by the due date
for filing the tax return for that tax year.
The spouse who revokes the choice must
attach a signed statement declaring that
the choice is being revoked. The state-
ment must include the name, address, and
identification number of each spouse. (If
one spouse dies, include the name and
address of the person who is revoking the
choice for the deceased spouse.) The
statement also must include a list of any
states, foreign countries, and possessions
that have community property laws in
which either spouse is domiciled or where
real property is located from which either
spouse receives income. File the state-
ment as follows.
a.
If the spouse revoking the choice
must file a return, attach the state-
ment to the return for the first year the
revocation applies.[/color]
This is the one time revocation, meaning they can never re-elect to file MFJ again.