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@Tiger5 wrote:

Yes recently married. she is the one with the income for 2020 and they have a child together. So would it be beneficial for her to file HOH or married filing separate?  

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You have all your client's info.  Only you'd be able to tell.  Between MFS and HoH, it should be evident which is generally a better option.  Question is more about whether MFJ could be beneficial.