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Does mailing the 83(b) on day 30 count as filing on time?

Incorporation & entity structure

Yes, under the mailbox rule, if it is postmarked within the 30-day window. Use certified mail with return receipt so you have dated proof.

The postmark is what matters, not the date the IRS opens it. Keep the receipt permanently, because the IRS does not acknowledge these filings.

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83(b) Election: What It Is, When You Need It, and How to File
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Check your EIN confirmation letter (CP 575) first. If that is gone, look at a previously filed tax return, a business bank account application, or any 1099 you have issued. Your bank or your payroll provider will also have it on file.

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