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Filing calendar
Deadlines & calendar.
Two dates drive everything on this site: March 15 for S-Corp returns and April 15 for individual returns. This page lays out both, what extensions buy you, and when to actually send your documents so a deadline never becomes a scramble.
The two dates that matter.
Form 1120S for calendar-year S-Corporations is due March 15. Form 1040 for individuals is due April 15. Both dates are fixed by the IRS regardless of when you engage us — the earlier you're in the queue, the more room we have to catch anything unusual before it's a problem.
If you need more time.
An extension moves the filing deadline, not the payment deadline. Form 7004 gives S-Corps six more months to file; Form 4868 does the same for individuals. Any tax owed is still due on the original date — an extension avoids a late-filing penalty, not a late-payment one. We file extensions as part of our extension add-on.
When to actually send documents.
Our median turnaround is 72 hours from a complete document set, but complete is the operative word. Send a full, checklist-matched set by February 15 for S-Corps and by the last week of March for individuals, and you're filing on time with room to spare. Partial documents sent early don't start the clock — SmartVault flags what's missing and we wait on the rest.
Staying ahead of it.
If you bundle monthly bookkeeping with your 1120S, your books are already closed when March arrives, and we can often file weeks ahead of the deadline. For individual filers, uploading as W-2s and 1099s arrive — rather than waiting for the full set — shortens the wait once everything's in.
Deadlines we don't set.
Quarterly estimated tax payments (typically mid-April, June, September, and January) run on a separate schedule from your annual filing and apply mainly to S-Corp shareholders and self-employed individuals. State filing deadlines usually mirror the federal date but not always — California, Missouri, and Indiana each set their own, and we flag any mismatch as part of your return, not as a surprise afterward.
Filing now · FY 2026
Pick your form.
Pick your form.
We'll take it from there.
Two forms, two deadlines, one workflow. Tell us which return you're filing and we'll send the SmartVault link and document checklist within the hour.
S-Corp · Form 1120S
Mar 15
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Individual · Form 1040
Apr 15
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