As you became an S Corp part way through the year, you will report the business transactions for the first half of the year on your personal tax return, Schedule c. For the last half of the year you will now report the business transactions on Form 1120S, U.S. Income Tax Return for an S Corporation.
As for how assets are handled for the transition, it depends on how the "Transition" occurred. Were you originally a Single Member LLC being taxed as a sole proprietor, and elected S Corporation tax treatment part way through the year (i.e. it's the same legal entity, but you just elected to be taxed differently)? Or did you create a new entity mid-year and contribute the assets to the new entity? If you created a brand new entity, then technically you have to segregate the two businesses - your old business, operating as a sole proprietor, stopped doing business. What happened to the assets of the old sole proprietorship? Did you sell them to the new legal entity? Did you just contribute them to the new legal entity? The tax treatment will depend on how you "changed" from sole proprietor to S Corporation and whether it's still the same legal entity (just taxed differently) or if it's a new legal entity.
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