Second-quarter 2026 estimated tax payments are 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. This guide explains who needs to pay, which form to use, and how to calculate a safe-harbor payment to avoid underpayment penalties.
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 2026-05-28. 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
- 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 falls on a Monday, so no shift applies.
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
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
Pay by 11:59 PM local time on June 15. Bank holidays do not extend the deadline.
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 matches 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 mirrors the federal structure. Estimated payments plus withholding must total at least the lesser of:
- 80% of the current-year NJ tax liability, OR
- 100% of the prior-year NJ tax liability — for taxpayers whose prior-year NJ Gross Income was $150,000 or less
- 110% of the prior-year NJ tax liability — for taxpayers whose prior-year NJ Gross Income exceeded $150,000
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 June 15, 2026.
For NJ residents who underpaid Q1, paying the Q1 shortfall along with Q2 on June 15 reduces but does not eliminate the Q1 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 owe a Q2 estimated payment on June 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 have 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 with prior-year CBT liability over $500 are generally required to make quarterly installments.
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 Miss 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 and was 8% for Q1 2025 and 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.
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 safe harbor for high-income NJ taxpayers?
For NJ taxpayers whose prior-year NJ Gross Income exceeded $150,000, the safe harbor is paying at least 110% of the prior-year NJ tax liability through withholding plus estimated payments. The federal safe harbor uses the same 110% rule when prior-year AGI exceeded $150,000. Pulling the prior-year return and applying 110% is the simplest planning anchor.
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 — 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.
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
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 2026-05-28 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.