Each one of your tax returns has to include the form 2555 if it is applicable to that tax year. So you will need to include it each time if necessary. As stated previously, you cannot combine tax returns from different years. Each tax year is completely separate, and it does not matter if you mail them on the same day. The IRS receives an immense volume of mail. Just because you mail your returns on the same day does not mean your returns will be received or processed at the same time. Furthermore, each Form 2555 is dated with the tax year on the upper right corner.
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