Deemed accumulated income permits statutory retention distinct from formal time-limited accumulation, with permitted investment modes applying where invested.

Section 343 determines deemed accumulated income from regular income after deducting amounts applied under section 341 and accumulated or set apart under section 342. The remaining amount, limited to 15% of regular income, constitutes deemed accumulated income. This statutory retention is distinct from formal accumulation for a specified purpose and limited period under section 342. Investment or deposit of deemed accumulated income must be made through a mode permitted under section 350.

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