Yes, that remain in place until the LLC elects to change its status by filing the requisite IRS form(s).
Most states allow a single member LLC. This is being recommended by tax practitioners to replace the sole proprietorship. In general it provides liability protection and an uncomplicated tax picture.
I suggest consulting with a tax advisor, business lawyer and CPA.
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I agree with my colleagues: the LLC's status as a C corporation is unchanged. Be advised, however, that the partnership will be required to use the accrual method of accounting as it is considered a partnership with a C corporation partner.