If the property is titled to a trust in your name, then the funds you received from the S-Corp were a distribution in excess of basis. Yes, you will need to amend the prior year return to report the distribution. And since this was in excess of your basis in the corporation, you will also need to amend your personal return to report a capital gain for the amount over your basis.
The only situation where this transaction is the purchase of an asset is if the S-Corp is on the title of the property with an ownership percentage relative to the cash you withdrew. For example, if the property cost $500K, then the S-Corp would own 60% of the property ($300K/$500K). In this case, you would amend the prior year return only if Form 1120S included a balance sheet. Otherwise, the purchase wouldn't affect taxable income or the member's basis.
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