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Plain-English answers to the tax questions business owners actually ask. We keep this page fresh — bookmark it.
Section 1
The dates that matter most for 2026. Miss one and you'll pay penalties — or worse, interest that compounds daily.
| Date | Deadline | Who it's for |
|---|---|---|
| Jan 15, 2026 | Q4 2025 Estimated Tax Payment | Self-employed, partners, S-corp shareholders |
| Jan 31, 2026 | W-2s and 1099-NECs delivered | All employers, anyone paying contractors $600+ |
| Mar 15, 2026 | Partnership (Form 1065) & S-Corp (1120-S) returns | LLCs taxed as partnership, S-corps |
| Apr 15, 2026 | Individual return (1040) + C-Corp (1120) + Q1 estimate | Most individuals, C-corps, anyone paying quarterly |
| Jun 15, 2026 | Q2 2026 Estimated Tax Payment | Quarterly filers |
| Sep 15, 2026 | Q3 estimate + extended partnership & S-corp returns | Quarterly filers, anyone on extension |
| Oct 15, 2026 | Extended individual (1040) and C-corp returns | Anyone who filed an extension |
| Dec 31, 2026 | 401(k), Solo 401(k), HSA, charity, year-end moves | Most retirement & tax-planning moves close today |
Dates shift to the next business day when they fall on a weekend or federal holiday. State deadlines may differ — confirm with us if you operate in multiple states.
Section 2
Quick gut-check tools. For the real numbers, book a tax review — we'll model your actual situation.
Estimate take-home pay after federal + state withholding.
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Rough quarterly estimate for self-employed income.
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401(k), IRA, Solo 401(k), SEP — current-year contribution caps.
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Health Savings Account contribution & catch-up limits.
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Section 3
Plain-English deep-dives on the questions we hear most often.
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