You can get more time to file a supplementary return under section 33E if you apply to the Commissioner under section 68CB(3C) or 68CC(4C) and they approve it. You need to meet two conditions to get this extension. The time to file is extended to 30 days after the Commissioner changes the approval. You will have 30 days to file your return after the Commissioner amends the approval. This means you get a bit more time to sort out your tax return. The Commissioner's decision will affect when you need to file. The extension is available if the Commissioner approves your application. You must apply under the right sections of the law to get the extension. The extension gives you extra time to file your return.