The journal entries to correct the omission would simply involve debits to the various expense accounts (corresponding to the expense types paid by the shareholder on behalf of the corp), and a credit to the balance sheet in some liability account such as "Loan / Advance From Shareholder".
Strictly speaking, any of these expenses that were incurred in 2010 should be put onto 2010's books (the expenses on the 2010 P&L, and the liability to shareholder showing on the Dec 31 2010 balance sheet).
Also strictly speaking, the 2010 corporate tax return should be amended to reflect these expenses (and there might be some tax refund benefit to doing so). This is because technically, those 2010 expenses can't be claimed as a 2011 tax return deduction; they can only be claimed for the year in which they're incurred (pursuant to a strict interpretation of the tax law). Hence, if you don't deduct them on an amended 2010 return, you simply lose them altogether.
That's not to say that many folks wouldn't simply put them all on the '11 return and skip the extra bother of amending '10. It's also not to say that an IRS agent in a good mood wouldn't let that li'l shortcut slide, especially if the amounts were relatively immaterial. But that would have to be your call.
On a separate note, if you don't plan on having the corp repay that loan sometime pretty soon, you should consider drafting a promissory note to support the arrangement as being a valid debt. Make sure the note bears market-reasonable terms as to repayment schedule and interest rate. Otherwise, you run the risk of having IRS successfully assert that the original payments by the shareholder for various corporate expenses were actually intended to be contributions to the entity's capital by the shareholder, rather than a short-term loan.
This may or may not be any big deal, but it's possible that a subsequent repayment to the shareholder would have different tax consequences, depending on whether the advances are respected as a bona fide loan, or are deemed to be capital contributions.
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