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You can e-file. What you need to do is to mark that as a foreign employer and the compensation is for services performed in the UK.
You cannot rely on a P60 (or P45) for US tax reporting. For one, these are reported on a fiscal year basis. Second, UK taxation of various compensation items is different from those of the US. Benefits-in-kind are reported on P11D but, again, the fiscal year reporting period and taxation of these elements do not conform the US tax law. You also need to take into account the type(s) of pension plan your client participates in, the applicability of treaty provisions, and how these may trigger F.3520/F.350-A reporting as well as PFIC (and how this may be mitigated by various elections, where applicable).
For a start, what you need is a detailed account from your client (who may be able to obtain a summary from the employer) for details of all the cash and non-cash components of his/her compensation as well as benefits and pension on a calendar year basis. It may also entail reading the employment agreement as well as other company policy documents to determine the proper US tax treatment and reporting of each component.
In terms of FTC, you will also need to understand your client's tax status in the UK as that determines the extent to which they are subject to UK tax and how the FTC may need to be scaled down.
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