NJ Q2 2026 Estimated Tax Payments: June 15 Deadline, Forms, and Safe Harbors Explained

Update (July 23, 2026): The Q2 2026 estimated tax deadline of June 15 has passed. If you missed it, pay as soon as you can. The NJ and federal underpayment penalty stops accruing on the shortfall once you pay. The next quarterly deadline is Q3: September 15, 2026, per the IRS Third Quarter Tax Calendar. The full Q3 walkthrough — including the extended 1120-S/1065 filing deadline that shares the date — is in our Q3 2026 estimated tax guide. The safe-harbor mechanics below apply to every quarter. Use our estimated tax calculator to size your Q3 payment. All dates and rates were re-verified against IRS.gov and nj.gov on July 16, 2026. Federal dates and underpayment interest rates were re-checked against IRS.gov on July 23, 2026.

Second-quarter 2026 estimated tax payments were due Monday, June 15, 2026 — for federal individual estimates, NJ individual estimates, NJ Business Alternative Income Tax (BAIT) estimates, and NJ Corporation Business Tax (CBT) estimates. That deadline has passed. The next installment is Q3, due September 15, 2026. This guide explains who needs to pay, which form to use, and how to calculate a safe-harbor payment to avoid underpayment penalties. The same mechanics apply to Q3 and Q4.

This is a deadline post for NJ business owners and self-employed individuals. If your withholding does not cover at least 90% of your current-year tax liability (or 100%/110% of last year’s), you generally owe quarterly estimates.

Planning information only — not tax advice. Last reviewed against IRS.gov and nj.gov primary sources on 2026-07-16. See Disclaimer.

Who Owes Q2 2026 Estimated Tax Payments

Federal Form 1040-ES estimated tax payments are required if you expect to owe at least $1,000 in federal tax for 2026 after withholding and refundable credits, per the IRS Form 1040-ES instructions.

In New Jersey, individuals must make NJ-1040-ES estimated payments when expected NJ tax owed exceeds $400, per NJ Division of Taxation guidance. NJ pass-through entities that have elected BAIT for 2026 owe quarterly PTE estimated payments. NJ C-corporations owe CBT-150 estimated payments.

NJ owners who typically owe Q2 estimates:

• Self-employed sole proprietors (Schedule C)
• S-corp owners (W-2 wages do not cover the K-1 distribution income)
• Partnership and multi-member LLC partners (K-1 income)
• Rental real estate owners with positive net income
• High-income W-2 earners with significant investment, RSU, or side income
• BAIT-electing pass-through entities (PTE-150)
• NJ C-corporations (CBT-150)

Federal Form 1040-ES: 2026 Second-Quarter Installment

The IRS Second Quarter Tax Calendar confirms: “6/15/2026 Individuals: Pay the second installment of 2026 estimated tax — Use Form 1040-ES.”

All four 2026 federal individual estimated tax installments:

• Q1 2026: April 15, 2026 (already past)
• Q2 2026: June 15, 2026 (passed)
• Q3 2026: September 15, 2026
• Q4 2026: January 15, 2027

If a deadline falls on a Saturday, Sunday, or legal holiday, payment is timely if made on the next business day. June 15, 2026 fell on a Monday and September 15, 2026 falls on a Tuesday, so no shift applies to either.

Federal Safe Harbor Methods

To avoid the IRS underpayment penalty, total estimated payments plus withholding must satisfy one of the safe harbors. Per IRS Form 1040-ES instructions, you generally avoid the penalty if you pay at least:

• 90% of your current-year (2026) total tax liability, OR
• 100% of your prior-year (2025) total tax liability — if your 2025 adjusted gross income was $150,000 or less ($75,000 or less if married filing separately), OR
• 110% of your prior-year (2025) total tax liability — if your 2025 AGI exceeded $150,000 ($75,000 if married filing separately)

For higher-income NJ taxpayers, the 110% safe harbor is the most common planning anchor. Pulling last year’s federal return and multiplying total tax by 110%, then dividing by four, produces the simplest safe-harbor installment figure.

ProAxis’s free Federal Estimated Tax Calculator runs the 90% / 100% / 110% safe-harbor math. It then splits the result into 2026 quarterly installments.

How to Pay the Federal Q2 Installment

Three approved methods, each documented at IRS.gov:

• IRS Direct Pay: free bank transfer at IRS Direct Pay
• EFTPS: the Electronic Federal Tax Payment System — used by most businesses and high-volume payers
• Form 1040-ES voucher by mail with check or money order

Submit IRS Direct Pay payments by 8 p.m. Eastern time on the installment due date. The IRS treats a same-day payment submitted after 8 p.m. ET as made the next business day. EFTPS payments must be scheduled at least one business day ahead. Check the current EFTPS cutoff before relying on a due-date submission. Mailed Form 1040-ES vouchers must be postmarked by the due date. Bank holidays do not extend the deadline. Source: IRS, Direct Pay help; EFTPS.gov.

NJ-1040-ES Individual Estimated Tax: Same Deadline

NJ residents and non-residents with NJ-source income use Form NJ-1040-ES for their state estimated payments. The NJ Q2 deadline matched the federal: June 15, 2026. The four installments are:

• Q1: April 15, 2026
• Q2: June 15, 2026
• Q3: September 15, 2026
• Q4: January 15, 2027

NJ Safe Harbor

NJ’s safe harbor is not the federal one. New Jersey has no 110% tier and no $150,000 income condition. Estimated payments plus withholding must total at least the lesser of these two figures:

• 80% of the current-year NJ tax liability, OR
• 100% of the prior-year NJ tax liability — available at every income level, including taxpayers whose prior-year NJ Gross Income exceeded $150,000. The prior-year return must have covered a full 12 months and shown a tax liability.
• Federal contrast: the 110% prior-year rule applies only on the federal side, for taxpayers whose prior-year AGI exceeded $150,000. New Jersey has no equivalent tier. Form NJ-2210 lists four exceptions, and none is conditioned on NJ Gross Income. (Source: NJ Division of Taxation, GIT-8, January 2026.)

For multi-state NJ owners, the safe harbor calculation gets complicated quickly. NJ taxes residents on worldwide income and non-residents on NJ-source income only; the credit for taxes paid to other jurisdictions reduces double taxation. A CPA can model the correct estimate.

How to Pay the NJ Q2 Installment

NJ offers an online payment portal at the NJ Division of Taxation website. Online payments process faster than mailed checks and provide immediate confirmation. Mailed payments must be postmarked by the installment due date — September 15, 2026 for Q3.

For NJ residents who underpaid Q1 or Q2, paying the shortfall now reduces but does not eliminate the earlier-quarter penalty. The underpayment penalty accrues by quarter, so catching up later does not undo the early-quarter shortfall.

NJ BAIT Q2 Estimated Payment (PTE-150) — Same June 15 Deadline

Pass-through entities (partnerships, S-corporations, multi-member LLCs taxed as partnerships) that have elected BAIT for the 2026 tax year owed a Q2 estimated payment on June 15, 2026. The Q3 installment is due September 15, 2026. The payment is made on Form PTE-150.

Per the NJ Division of Taxation PTE/BAIT FAQ, the four BAIT estimated payment dates for calendar-year entities are:

• Q1: April 15
• Q2: June 15
• Q3: September 15
• Q4: January 15 (following year)

BAIT Estimated Payment Calculation

The BAIT estimated payment should generally cover 25% of the entity’s expected annual BAIT liability per quarter. For entities with significantly higher income in earlier or later quarters, a quarterly true-up calculation may be more accurate than a flat-quarter estimate.

The BAIT tax is calculated on a tiered structure based on the entity’s “sum of each member’s share of distributive proceeds.” Pulling the prior-year PTE-100 return, applying the current-year rates from the PTE-100 instructions, and dividing the annual estimate by four produces a workable Q2 figure.

Why the BAIT Q2 Payment Matters

A late BAIT estimated payment costs the entity an underpayment penalty under the NJ underpayment statute. More importantly, if the entity ends the year without making sufficient estimated payments, the entity-level NJ tax may not be deductible for federal purposes in the year intended — undermining the SALT cap workaround logic that drives the BAIT election in the first place.

ProAxis covers BAIT election strategy in depth on the NJ BAIT Election service page and in our NJ SALT Tax Changes in 2026 post.

NJ CBT-150 Corporate Estimated Tax — Same Deadline

NJ Corporation Business Tax (CBT) filers also had a June 15 Q2 estimated tax deadline. Calendar-year C-corporations use Form CBT-150 for the installment.

The CBT-150 installment is calculated based on the corporation’s expected current-year CBT liability. Corporations whose prior-year CBT liability is greater than $1,500 must make installment payments. The schedule is 25% in the 4th, 6th, 9th, and 12th months of the accounting period. Corporations with $50 million or more in prior-period gross receipts follow a different schedule. They pay 25% in the 4th month, 50% in the 6th, and 25% in the 12th. A corporation whose prior-year liability is $1,500 or less may instead make a single payment. That payment is 50% of the prior-year liability, due by the original due date of the prior-year return. (2026 Form CBT-150 instructions; 2025 CBT-100 instructions, Line 7.)

For NJ corporations operating across multiple states, allocation factors (the NJ apportionment formula) and the latest combined reporting rules under the NJ Corporation Business Tax Reform affect the installment calculation. Multi-state corporations should run the apportionment calculation before paying.

What If You Missed the June 15 Deadline

Missing a federal estimated tax installment triggers the IRS underpayment penalty, calculated on Form 2210. The penalty is interest-based — it accrues from the date the installment was due until the underpayment is paid or until April 15, 2027 (whichever comes first).

The IRS interest rate for individual underpayments is set quarterly, per the IRS quarterly interest rates page. It is 7% for Q3 2026, after 6% in Q2 2026 and 7% in Q1 2026 — high enough that procrastinating estimated payments is materially expensive.

NJ underpayment penalties run on a similar mechanic, calculated on Form NJ-2210 and applied quarter-by-quarter. Catching up later does not eliminate the per-quarter underpayment penalty.

The simplest mitigation if you missed Q2: pay as soon as possible, then continue paying Q3 and Q4 on time. Re-running the safe-harbor math against your actual YTD numbers can also identify whether you have a current-year shortfall worth addressing before December. Q3 is next — the September 15 deadline stack, including the catch-up math, is covered in our Q3 2026 estimated tax guide.

Q2 2026 Estimated Tax — Frequently Asked Questions

Is the Q2 2026 federal estimated tax deadline June 15 or June 16?

For tax year 2026, the second-quarter federal estimated tax deadline is June 15, 2026 (Monday). Per the IRS Second Quarter Tax Calendar, “6/15/2026 Individuals: Pay the second installment of 2026 estimated tax — Use Form 1040-ES.” The June 16 date some sources reference was the tax year 2025 deadline (June 15, 2025 fell on a Sunday and shifted to Monday June 16, 2025).

Do I owe Q2 estimated taxes if I have W-2 withholding?

Possibly. If your W-2 withholding covers all of your tax liability (including any K-1 income, capital gains, or side business income), you generally do not owe estimates. If your withholding falls short of the safe harbor — generally 90% of current-year tax or 100%/110% of prior-year tax — the shortfall is collected through quarterly estimates.

What is the NJ estimated-tax safe harbor for high-income taxpayers?

New Jersey’s rule differs from the federal one. NJ has no 110% high-income tier and no $150,000 line. You avoid NJ underpayment interest if withholding plus timely estimates cover the lesser of two figures. Those are 80% of the current-year NJ tax or 100% of the prior-year NJ tax. The prior-year figure counts only if that return covered a full 12 months and showed a tax liability. Federally, the 110% rule does apply when prior-year AGI exceeded $150,000. Pulling the prior-year return is still the simplest planning anchor. Source: NJ Division of Taxation, GIT-8 (January 2026); IRS Form 1040-ES instructions.

When is the NJ BAIT Q2 estimated payment due?

The NJ BAIT (Business Alternative Income Tax) Q2 estimated payment is due June 15, 2026 for calendar-year pass-through entities. The payment is made on Form PTE-150. All four BAIT installments for calendar-year entities are due April 15, June 15, September 15, and January 15 of the following year.

Can I make estimated tax payments online?

Yes. The IRS offers IRS Direct Pay (free, bank account) and EFTPS (for higher-volume payers). NJ offers online payment for NJ-1040-ES, PTE-150, and CBT-150 through the NJ Division of Taxation portal. Online payments process faster than mailed checks and provide immediate confirmation.

What happens if my Q2 estimate is too low?

If your Q2 estimate plus YTD withholding plus Q1 estimate falls short of the running safe harbor, you accrue an underpayment penalty on the shortfall for the period from June 15 forward. Catching up in Q3 does not eliminate the Q2 underpayment penalty — it simply stops accruing additional underpayment from Q3 forward. Re-running the safe-harbor calculation each quarter against actual YTD income is the safest method.

Does the federal OBBB change my Q2 2026 estimated payment calculation?

OBBB (the One Big Beautiful Bill Act, Public Law 119-21, signed July 4, 2025) made the QBI deduction permanent, raised Section 179 expensing limits, and restored 100% bonus depreciation — all of which reduce 2026 federal tax liability for many NJ small business owners. If your prior-year (2025) tax already reflected OBBB provisions, the safe harbor math is unchanged. If your prior-year tax was estimated before OBBB was signed in July 2025, the 2026 safe harbor calculation may yield a lower required estimate. See our OBBB Tax Provisions for NJ Businesses in 2026 post for the full federal changes.

Sources and Primary Materials

This guide cites primary government materials only:

• IRS — Second Quarter Tax Calendar (6/15/2026 deadline)
• IRS — Third Quarter Tax Calendar (9/15/2026 deadline)
• IRS — Quarterly Interest Rates
• IRS — Estimated Taxes (Small Businesses & Self-Employed)
• IRS — Estimated Tax FAQ
• IRS — Form 1040-ES (2026)
• IRS — Direct Pay
• EFTPS — Electronic Federal Tax Payment System
• NJ Division of Taxation — PTE/BAIT FAQ (Q2 6/15 deadline)
• NJ Division of Taxation — Main Site

All references verified against the primary source URLs on 2026-05-28 and re-verified on 2026-07-16.

How ProAxis Helps with Q2 Estimated Tax Planning

ProAxis Tax & Accounting Services is a licensed CPA firm based in Hasbrouck Heights, Bergen County NJ. We are licensed in NJ and NY, AICPA members, and Authorized IRS e-File Providers. Practice focuses on small and mid-size businesses across the NYC Metro Tri-State area.

For Q2 estimated tax planning specifically, we work with NJ owners on:

• Federal and NJ safe-harbor calculations under engagement
• BAIT PTE-150 estimated payment modeling for pass-through entities
• CBT-150 calculation for NJ C-corporations
• Multi-state allocation for NJ residents with out-of-state income
• True-up calculations when income varies significantly by quarter

Every remaining federal and NJ due date for the year is listed on the NJ tax and sales tax calendar. Rate tables sit on the NJ tax rates reference.

For planning under engagement, schedule a discovery call through the contact page or call 201-800-2330.

General information only — not tax advice. Every business situation is different. The dates and rules cited above are accurate to primary government sources as of 2026-07-16 but are subject to subsequent IRS or NJ Division of Taxation guidance. No CPA-client relationship is created by reading this article. See Disclaimer and Terms of Service for the full terms.