The conditions are mentioned in the T&C of the agreement between the issuer and investors. Some standard conditions are:
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Usually, a fixed rate of dividends need to be paid over the years.
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The company has to pay dividends from its earnings after tax.
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Other than earnings after tax, it can be repaid from share premium A/c.
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The company cannot repay from the current assets.
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The company cannot sell its fixed assets and repay them.
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The company cannot borrow & repay preference shareholders.