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In answer to your first question, it is yes. As long as you have the proper amount  in your Box 1 to include your wages and 

medical insurance premiums. Be sure that when you get the corrected amended W2 from the payroll processor, it matches correctly to the figure on that amended W2  that you issued for yourself.

 

As far as your second issue, Per the w-2 instructions:

 

Employee Solo 401k contributions (elective deferrals) made as a pre-tax contribution are not included in box 1 of the w-2 but instead are reported in Box 12 (Code D). 

 

As far as the medical deduction premium which comes off as a deduction  from your Scorp tax return as a business expense, it will be included as Compensation of officers(line 7 of the 1120S) which is equal to the total amount of Box 1 of your W2. 

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