NJ Estimated Taxes for Business Owners: 2026 Dates and Safe Harbors

Your last estimated tax payment for 2026 is due January 15, 2027, to both the IRS and New Jersey. If you own a business, it probably applies to you. The two systems use the same calendar, but the rest differs: who has to pay, how much counts as "enough," and what it costs when you come up short.

Who has to make estimated payments

Federal

The IRS says people who are in business for themselves will generally have to pay their tax this way. Estimated tax covers more than income tax. It also covers self-employment tax.

For 2026, you generally must pay estimated tax if both of these are true:

• you expect to owe at least $1,000 for 2026 after subtracting withholding and refundable credits; and
• your withholding and refundable credits will be less than the smaller of 90% of your 2026 tax or 100% of your 2025 tax.

The IRS's small-business guide (Publication 583) names sole proprietors, partners and S corporation shareholders. Each generally has to make estimated payments if they expect to owe $1,000 or more.

New Jersey

NJ's bar is much lower. For 2026, residents and nonresidents alike must make estimated payments if they expect to owe more than $400. NJ measures that after withholding and other credits. It also says you may have to make NJ estimated payments even if you don't have to make federal ones.

The four 2026 due dates

The IRS and NJ use the same four dates for 2026:

• April 15, 2026
• June 15, 2026
• September 15, 2026
• January 15, 2027

Mailing your January payment? The 2026 Form 1040-ES warns that the postmark date is the date it's processed at a USPS facility, which "may or may not be the date you drop your payment off in the mailbox."

Safe harbors: federal vs NJ

A safe harbor is the amount you need to have paid in, through withholding and on-time estimates, so you aren't charged for underpaying.

Federal: 90%, 100% or 110%

For 2026, the federal target is the smaller of:

• 90% of your 2026 tax; or
• 100% of your 2025 tax (your 2025 return must cover all 12 months).

If your 2025 adjusted gross income was more than $150,000 ($75,000 if you're married filing separately for 2026), use 110% instead of 100% for the second test.

New Jersey: 80% or 100%

NJ uses a lower current-year percentage. Under NJ's current guidance (publication GIT-8), your underpayment is measured against the lesser of 80% of this year's total tax or 100% of last year's total tax. GIT-8 doesn't add a 110% version for higher incomes. Note that GIT-8 and the NJ-1040 instructions stating this test were written for tax year 2025; the 2026 NJ-1040-ES instructions don't restate it.

To use the prior-year test in NJ, you must have filed a NJ return for the prior year that covered the full 12 months, and you must have had NJ tax for that year. If your prior-year NJ return showed no tax, NJ won't assess interest.

If your income is uneven

If your income doesn't come in evenly through the year, the IRS's annualized income installment method may let you pay less for some periods. If you use it, you file Form 2210 with Schedule AI with your 2026 return. Besides the prior-year test, NJ has three more exceptions on Form NJ-2210, including one that annualizes your income, and you can use a different exception for each quarter.

Which target should you aim for?

The prior-year test uses a number you already know from your 2025 return. The current-year test depends on how 2026 actually turns out.

More on planning around the quarters: quarterly tax planning strategies for contractors.

Federal vs NJ at a glance (tax year 2026)

What happens if you underpay

Federal: a penalty

The IRS imposes the penalty on each underpayment for the number of days it remains unpaid, and figures it separately for each payment period. That's why paying late in the year doesn't erase the cost of the quarters you missed.

The rate is the IRS's quarterly underpayment rate: the federal short-term rate plus 3 percentage points, compounded daily. Here's what it has been:

• 2025: 7% in every quarter.
• 2026: 7% in the first quarter, 6% in the second, 7% in the third and 7% in the fourth.

As of November 11, 2026, the IRS hasn't posted the rate for the first quarter of 2027.

The IRS says this penalty generally can't be waived for reasonable cause, apart from narrow exceptions such as a casualty or disaster.

New Jersey: interest, not a penalty

NJ charges interest instead. It applies if you didn't pay at least 80% of your tax during the year and your tax is more than $400 after credits. NJ says this is true "even if you pay all the taxes due by the filing deadline (April 15)," unless you meet an exception on Form NJ-2210.

• The rate: prime plus 3%, compounded annually. NJ's assessed rate is 10.00% for 2026 (prime of 7.00% plus 3%). For 2025 it was 10.75%. NJ can reset the rate for later quarters if prime moves by more than one percentage point.
• How long it runs: on an estimated-tax underpayment, GIT-8 says interest runs from the payment's due date to the date you paid, "but only up to April 15."
• Where it's figured: on Form NJ-2210, which you complete to see whether interest is due and how much.

If you were required to make NJ estimated payments and missed earlier quarters, GIT-8 says you must pay all past-due amounts with the first payment you make for that year.

Skipping the January 15 payment

Both let you skip it if you file early and pay in full:

• Federal: the 2026 Form 1040-ES says you don't have to make the January 15, 2027 payment if you file your 2026 return by February 1, 2027, and pay the entire balance due with your return.
• New Jersey: the 2026 NJ-1040-ES instructions say you don't need to make the January 15, 2027 payment if you file your 2026 return by February 15, 2027, and pay the entire balance due.

If you also receive wages, for example from your own S corp, there's another route. Both the IRS and NJ point to more withholding as an alternative to estimates: give your employer a new Form W-4 for federal tax and Form NJ-W4 for NJ tax.

A note for S corp and partnership owners: NJ BAIT

If your S corp or partnership elected NJ's Pass-Through Business Alternative Income Tax (BAIT), the business pays the tax. You get a Schedule PTE-K-1 and claim a credit for your share of the tax paid. NJ says the credit is refundable, and it treats the BAIT credit "similar to withholdings." The 2026 NJ-1040-ES worksheet lists the BAIT credit among the credits you subtract when you estimate your NJ tax.

That doesn't automatically mean you can stop paying personal estimates. NJ's own BAIT FAQ asks whether resident owners should stop making NJ-1040-ES payments once the business elects BAIT. For an S corp, BAIT is "based solely on New Jersey-sourced income." NJ's answer includes this warning:

"For tax years beginning on or after January 1, 2022, a resident member of a pass-through entity taxed as an S corporation may also be underpaid. In addition, pass-through entity owners may still need to make NJ-1040-ES estimated tax payments to cover the tax on other income they receive, aside from pass-through entity income, such as personal investment income or retirement distribution income."

NJ also says BAIT estimated payments are separate from NJ-1040-ES estimated payments and "cannot be applied to any other tax account."

For more on how an S corp affects your NJ taxes, see S corp tax savings for small business owners in New Jersey.

This is general information, not advice for your specific situation. Tax rules change; this post reflects the rules as of November 2026.

Not sure you've paid enough for 2026? Talk to Henry CPA before the January 15 payment is due.