If you continue to read further down in the article you will find this:
Need to use a credit card to pay taxes owed?
If you've e-filed or mailed Form 4868 and need to pay by credit card, you can use one of several IRS approved Electronic Payment Methods. You can pay with your debit or credit card online or by phone. File your complete return by October 15, 2024.
Cautions
- If the IRS thinks your estimate of the amount of tax you owe is unreasonable, it may disallow your extension and assess a late-filing penalty.
- If you underestimate the amount of tax you owe, you'll likely have to pay interest and perhaps penalty on whatever amount you fail to pay by the original filing deadline.
- If you pay less than 90% of the tax you owe, you'll end up owing a penalty of 0.5% of the underpayment every month until you pay the remaining balance. For example, if you pay $600 by the original filing deadline, but discover when you complete your return that you really owe $1,000, you will usually owe 0.5% per month on the $400 that is overdue, or about $2 a month, until you pay the full amount owed.
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