Line 4 is your estimated tax liability and line 5 is what you have paid in, so line 6 is the tax due (line 4 minus line 5. ) The amount listed on line 6 is just an estimated tax due, so you don't have to make a payment if you think you don't owe anything. It won't cause any trouble if you file the extension showing a balance due and then don't make a payment. You would only incur penalties and interest if your actual tax return showed a balance due and you paid it late.
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