2026 Quarterly Estimated Tax Dates: Form 1040-ES Calendar Through January 15, 2027

Author: Gloria Liu, CPA ｜ YCL Tax, Accounting & Advisory

Bottom line in one breath

If you are a calendar-year taxpayer with self-employment, gig, rental, interest/dividend, partnership, or S corporation K-1 income that is not fully covered by withholding, Form 1040-ES for tax year 2026 is generally due April 15, June 15, and September 15, 2026, and January 15, 2027. Today is September 19, 2026—the third installment just passed—so most Cary/RTP clients should lock the next federal date (January 15, 2027) and run compliance planning against the safe-harbor tests rather than waiting until filing season.

Background

Each year the IRS publishes Form 1040-ES, Estimated Tax for Individuals, explaining how to figure and pay tax that is not withheld. The 2026 Form 1040-ES (Catalog 11340T, dated February 12, 2026) lists the four calendar-year payment dates and footnotes that you generally may skip the January 15, 2027 voucher if you file your 2026 return and pay the full balance by February 1, 2027. IRS estimated-tax FAQs and the Taxpayer Advocate Service 2026 “important tax dates” list use the same milestones. Important nuance: estimated-tax “quarters” are not four equal calendar quarters—the second period covers only April–May and the third covers June–August.

Old vs. new

1. Tax year 2026 (in progress) due dates: 4/15/2026 → 6/15/2026 → 9/15/2026 → 1/15/2027 (as printed on Form 1040-ES; Saturday/Sunday/legal holiday → next business day).

2. Skipping January 15: Generally allowed if you file the 2026 return and pay the entire balance by February 1, 2027 (待核 holiday shift near that date).

3. Who usually must pay: You expect to owe at least $1,000 after withholding and refundable credits, and withholding plus refundable credits are less than the smaller of 90% of 2026 tax or 100% of 2025 tax (full 12-month prior return)—see higher-income rule below.

4. Higher-income safe harbor: If 2025 AGI exceeded $150,000 ($75,000 if 2026 filing status is married filing separately), use 110% of prior-year tax instead of 100%.

5. Payment periods vs. calendar quarters: Jan 1–Mar 31 → Apr 15; Apr 1–May 31 → Jun 15; Jun 1–Aug 31 → Sep 15; Sep 1–Dec 31 → Jan 15 of the following year.

6. Farming/fishing: If at least two-thirds of gross income for 2025 or 2026 is from farming or fishing, you may pay all estimated tax by January 15, 2027, or file and pay by March 1, 2027 (see form instructions).

7. State estimates: North Carolina and other states often track federal timing but confirm the current NCDOR notice (待核).

Self-check: does this affect you?

1. You have 1099 / self-employment / platform income and W-2 withholding will not cover the full federal liability.

2. You are a partner or S corporation shareholder whose K-1 income rarely has full federal withholding.

3. You expect large interest, dividends, capital gains, rents, or crypto dispositions without extra withholding.

4. Your 2025 AGI was high enough that the 110% prior-year safe harbor applies.

5. You coordinate Cary/RTP and Shanghai books and income is lumpy—annualized installments may matter.

Simplified example (illustration only; ignores interest/penalty math)

Mr. Wang in Cary expects about $20,000 of 2026 federal tax with roughly $8,000 of W-2 withholding—about a $12,000 gap:

1. Equal-installment sketch: About $3,000 per voucher on 4/15, 6/15, 9/15/2026 and 1/15/2027 (adjust for worksheet truth and amounts already paid).

2. Safe-harbor sketch: Spreading 100% or 110% of prior-year tax (as applicable) across four periods may satisfy the underpayment-penalty threshold even if current-year profit is higher—this is a timing/compliance tool, not a promise of lower tax.

3. Late-year spike: If a large gain hits in the fall, evaluate the annualized income installment method (Form 2210 Schedule AI) so early periods are not treated as short—keep workpapers (待核 case-by-case).

Action timeline

1. Now (late September 2026): Confirm whether the September 15 installment was paid at the right amount; catch up promptly and save confirmation numbers.

2. October–December 2026: Refresh the 1040-ES worksheet with updated projections; consider a new Form W-4 to raise withholding if that is cleaner than larger vouchers.

3. By January 15, 2027: Make the fourth installment—or confirm you can file and fully pay by February 1, 2027 to skip it.

4. Payment channels: Prefer IRS Online Account or IRS Direct Pay (bank account, generally no IRS fee); keep the confirmation page. See the companion Direct Pay guide.

5. At filing: Report all estimated payments on the return; prepare Form 2210 if an underpayment penalty analysis is needed.

What YCL can do

1. Form 1040-ES / Pub. 505 projections with safe-harbor cross-checks.

2. Combined W-2 withholding + estimated-tax planning for self-employed owners, partners, and S corp shareholders.

3. Annualized-installment reviews and Form 2210 workpapers when income is uneven.

4. Federal + North Carolina estimated calendars; bilingual timing for China-side cash-flow docs.

5. Support from Cary (RTP) and Shanghai with CPA Chenchen Liu and Gloria—Free Consultation at yclcpa.com.

FAQ

Q: I missed the September 15 payment—what now?

A: Pay the catch-up amount based on your latest projection and keep the confirmation. Whether a penalty applies depends on the full-year safe harbor or annualized method—Form 2210 at filing time, not a guess that “paying more later always fixes it.”

Q: Can I combine all four installments into one January payment?

A: You may pay the year’s estimate in full by April, or pay by installment. But if earlier required installments were short, catching up at year-end may still leave underpayment exposure for those earlier periods. Timing is part of compliance.

Q: How does January 15 relate to the return due date?

A: January 15 is the fourth estimated installment for tax year 2026. The 2026 Form 1040 is generally due in mid-April 2027 (or October if extended). Filing and fully paying by February 1, 2027, generally lets you skip the January voucher.

Book a consult

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Disclaimer

This article is general tax information only and is not tax, legal, or investment advice for any person or business. Application depends on your facts and the latest IRS, FinCEN, and NCDOR guidance. Items marked 待核 require verification before filing. Consult a licensed professional for advice specific to you.