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All marketable debt securities are held at cost on a company's balance sheet as a current asset, until a gain or loss is realized upon the sale of the debt instrument. Marketable debt securities are held as short-term investments and are expected to be sold within one year. If a debt security is expected to be held for longer than one year, it should be classified as a long-term investment on the company's balance sheet.
Noncurrent assets are cleverly defined as anything not classified as a current asset. The main line items in this section are long-term investments; property, plant, and equipment (PP&E); and goodwill and other intangible assets. Long-Term Investments. This is money invested in either bonds with longer terms than one year or the stock of other companies.