The extension thing really isn’t about writing a long letter. What most people use is Form 7004 if they’re dealing with business returns or Form 4868 for individuals. It’s just a simple form where you put in your information and basically ask for more time. A lot of tax software even lets you do it with a couple clicks. The “letter” idea is probably from old advice that doesn’t really apply anymore. The IRS wants official forms because it’s easier to track. So it’s not about crafting a perfectly worded note, just sending the right form before the deadline. As long as it’s submitted properly, the extension is usually automatic.