Published June 15, 2026 · Last updated: June 2026 · NJ Tax Planning Services
Bergen County Small Business Tax Planning Calendar: Monthly Actions That Reduce Your Tax Bill
- NJ deadlines trail federal by a month. The NJ CBT-100S (S-corp) is due April 15 vs. the federal March 16; the NJ CBT-100 (C-corp) is due May 15 vs. the federal April 15.
- The NJ estimated tax threshold is $400, far below the federal $1,000. Many owners who owe no federal estimates still owe NJ estimates.
- NJ underpayment interest is 10% for 2026 (prime + 3%), notably higher than the federal 6-7%, plus a flat 5% late penalty.
- The NJ BAIT/PTE-100 election has a hard March 16 deadline with no extension. Missing it forfeits the SALT-cap workaround savings for the year.
- The tax-reducing moves happen during the year, not at filing. Use the no-deadline months (July, August, November) for planning.
Most Bergen County business owners think about taxes twice a year: in March when returns are due, and in April when they write the check. That is the single most expensive habit in small business finance. By the time you are filing a return, the year is over and almost every move that could have lowered the bill is off the table.
Tax planning is a monthly activity, not an annual event. And in New Jersey, the stakes for getting the timing right are higher than in most states, because New Jersey deadlines do not match the federal ones. NJ business returns trail the federal dates by a full month, the NJ estimated tax threshold is far lower than the federal one, and New Jersey charges a 10 percent underpayment interest rate that is materially steeper than the federal rate.
This is a month-by-month tax planning calendar built specifically for Bergen County small businesses, covering both the federal and New Jersey deadlines side by side, plus the planning action that belongs in each month. Use the interactive calendar below to jump to the current month, then read the sections that explain the moves that actually reduce your tax bill.
Bergen County Tax Action Calendar 2026
Tap any month to see the federal deadlines, New Jersey deadlines, and the planning action that belongs in that month. The current month is highlighted.
Dates reflect the 2026 tax year and shift when a deadline falls on a weekend or holiday. This calendar is general guidance, not tax advice. Confirm current-year deadlines with a licensed CPA.
The One Thing Most NJ Owners Get Wrong: The Timing Gap
They do not. This is the most important fact in this guide, and it is the one that costs Bergen County owners the most.
Federal S-corporation and partnership returns are due March 16. The New Jersey equivalent, the CBT-100S, is due April 15, a full month later. Federal C-corporation returns are due April 15. The New Jersey CBT-100 is due May 15. An owner who files everything in March because that is when the federal returns are due is fine. An owner who assumes New Jersey follows the same April 15 date as the federal individual return will miss the NJ S-corp deadline entirely.
The thresholds differ too. The federal estimated tax threshold, the point at which you must make quarterly payments, is $1,000. New Jersey's is $400. Many owners who correctly conclude they owe no federal estimates still owe New Jersey estimates, and do not find out until the interest accrues.
New Jersey's underpayment interest rate for 2026 is 10 percent (prime rate plus 3 percent). The federal underpayment rate for the same period is 6 to 7 percent. New Jersey also adds a flat 5 percent late payment penalty. A missed or underpaid NJ estimate costs more than most owners assume, which is exactly why the monthly discipline below matters.
First Quarter: January Through March
January. Close the prior year's books. Gather your 1099-NEC data and confirm contractor payments are documented. The fourth-quarter federal estimated payment was due January 15, along with the New Jersey fourth-quarter estimate. W-2s and 1099-NEC forms must reach recipients by January 31, and your New Jersey quarterly payroll filings (NJ-927 and WR-30) are due the same day. The planning action: confirm your prior-year estimated payments met the safe harbor so you are not exposed to an underpayment penalty for a year that is already closed.
February. This is preparation month. Organize records for return preparation, and review your entity structure before the filing deadlines arrive, because the structure you file under affects everything downstream. New Jersey first-quarter property tax is due February 1, with a 10-day grace period to February 10. After the grace period, interest accrues retroactively to the first.
March. Two hard deadlines define this month. Federal S-corporation and partnership returns are due March 16. More importantly for New Jersey pass-through owners, the BAIT/PTE-100 election is due March 16 with no extension and no retroactive filing. The New Jersey Pass-Through Business Alternative Income Tax is one of the most valuable tax strategies available to NJ S-corps and partnerships, because it works around the federal cap on state and local tax deductions. But the election must be made on time. Miss it, and the savings for that year are gone. We cover the mechanics in our NJ BAIT Election guide, and March is the month it matters.
Second Quarter: April Through June
April. The big one. Federal individual returns (1040), federal C-corporation returns (1120), and the first-quarter estimated payment are all due April 15. In New Jersey, the CBT-100S for S-corporations is due April 15, the NJ-1040 individual return is due April 15, and the first-quarter New Jersey estimate is due the same day. If you need an extension, New Jersey requires that 80 percent of the tax be paid for individuals, or 90 percent for corporations, for the extension to be valid. An extension extends the time to file, never the time to pay.
May. The New Jersey CBT-100 for C-corporations is due May 15, a month after the federal C-corp deadline. New Jersey second-quarter property tax is due May 1, with grace to May 11. This is also a natural mid-year checkpoint: review your year-to-date profit and loss against your projections so the June estimate reflects reality.
June. The second-quarter estimated payment is due June 15 at both the federal and New Jersey levels. This is the most valuable planning month of the first half of the year. Run a mid-year tax projection: if your income has shifted up or down from your January assumptions, adjust the remaining estimates now rather than discovering a shortfall in April. June is also when you should evaluate planned equipment purchases and Section 179 expensing, because the earlier you plan them, the more flexibly you can time them.
Third Quarter: July Through September
July. No major federal deadline falls in July, which makes it the ideal month for a mid-year strategy session. Evaluate retirement plan contributions, review how your entity election is performing against projections, and assess whether any structural changes make sense for the back half of the year. If you collect New Jersey sales tax, the second-quarter ST-50 return is due July 20.
August. Another planning-focused month with no major federal deadline. New Jersey third-quarter property tax is due August 1, with grace to August 11. Use the quiet period to plan major purchases around depreciation timing and to review payroll growth and hiring against your budget.
September. Two deadlines. The third-quarter estimated payment is due September 15 at both levels. Extended S-corporation and partnership returns, both federal and the New Jersey pass-through returns, are also due September 15. Pay the Q3 estimate, finalize any extended returns, and begin year-end planning in earnest, because the moves that reduce your tax bill must happen before December 31, and the planning has to come first.
Fourth Quarter: October Through December
October. Extended federal individual and C-corporation returns are due October 15, along with extended New Jersey individual returns and CBT extensions. File everything outstanding. Then run a fourth-quarter tax projection and lock in your year-end strategy, because you now have roughly ten weeks to execute it.
November. No major federal deadline. New Jersey fourth-quarter property tax is due November 1, with grace to November 11. This is execution month for year-end moves: equipment purchases you want to place in service this year, retirement plan funding, and decisions about deferring income into next year or accelerating it into this one based on your projected brackets.
December. The final planning window. This is when year-end actions must be completed: prepay deductible expenses where it makes sense, confirm your estimated payments cover your liability, and finalize retirement contributions where the deadline is year-end rather than the filing date. New Jersey annual reports are due in your formation anniversary month, with a $75 fee for LLCs and $25 for corporations, so confirm yours is filed. Document everything you did this year, because clean documentation is what makes every one of these moves defensible.
How to Actually Use This Calendar
A tax calendar only works if it drives action before deadlines, not reminders after them. Three habits separate the owners who reduce their tax bill from the ones who merely file on time.
First, do a quarterly projection. Four times a year, before each estimated payment, project your full-year income and tax. This is what lets you adjust estimates to avoid both underpayment penalties and the opposite problem of lending the government money interest-free.
Second, treat the no-deadline months as the planning months. July, August, and November have no major federal filing deadline. Those are not months off. They are the months when the actual planning, the entity reviews, the purchase timing, the retirement funding, gets done without deadline pressure.
Third, front-load the New Jersey calendar. Because NJ deadlines trail federal by a month and the thresholds are lower, the safest practice is to handle New Jersey obligations on the federal timeline rather than waiting for the later NJ date. Pay NJ estimates when you pay federal. Prepare the NJ return when you prepare the federal one. The month of breathing room NJ gives you is better used as a buffer than as a reason to wait.
Proactive monthly tax planning is the difference between filing a return and reducing a tax bill. Our Bergen County CPAs build the calendar around your business and the NJ-specific deadlines that trip most owners up.
Book a free tax planning consultation →Frequently Asked Questions
When are New Jersey small business taxes due in 2026?
New Jersey business return deadlines trail the federal dates by one month. The NJ CBT-100S for S-corporations is due April 15 (the federal S-corp deadline is March 16), and the NJ CBT-100 for C-corporations is due May 15 (the federal C-corp deadline is April 15). New Jersey estimated tax payments follow the same quarterly dates as federal: April 15, June 15, September 15, and January 15. The NJ-1040 individual return is due April 15. The BAIT/PTE-100 election has a hard March 16 deadline with no extension.
What is the NJ estimated tax threshold for small businesses?
New Jersey requires estimated tax payments if you expect to owe $400 or more in NJ income tax after withholding and credits. This is significantly lower than the federal threshold of $1,000. Corporations must make estimated CBT payments if they expect to owe $500 or more. Because the NJ threshold is so much lower, many business owners who owe no federal estimated payments still owe New Jersey estimates, and the NJ underpayment interest rate for 2026 is 10 percent, notably higher than the federal rate.
What happens if I miss a New Jersey tax deadline?
New Jersey assesses a flat 5 percent late payment penalty on the unpaid balance, plus interest at the prime rate plus 3 percent, which equals 10 percent for 2026. For estimated tax underpayments, NJ charges interest at the same rate on the shortfall. There may also be a $100 per month penalty for failure to file certain information returns for partnerships and S-corporations. Because these costs are higher than the federal equivalents, timely New Jersey payments are especially important.
Do I really need monthly tax planning for a small business?
Yes, if you want to reduce your tax bill rather than just report it. By the time a return is filed, the tax year is closed and almost every planning move is unavailable. Monthly attention lets you adjust estimated payments to avoid penalties, time equipment purchases and retirement contributions for maximum benefit, make the NJ BAIT election before its hard March deadline, and execute year-end moves before December 31. The actions that lower a tax bill happen during the year, not at filing.
Plan Your Year With a Bergen County CPA
A tax calendar is a starting point. Turning it into a lower tax bill takes a CPA who knows the NJ deadlines that trail federal, the BAIT election that saves pass-through owners thousands, and the year-end moves that must happen before December 31.
Book a free tax planning consultation →Related: NJ BAIT Election Guide for the March deadline that matters most, and LLC vs. S-Corp in New Jersey for how entity structure changes your filing calendar.
