NJ Tax Deadlines 2026-2027 — Income, Sales & Quarterly

NJ Quarterly Sales Tax Due Dates (2026-2027)

New Jersey sales tax is reported on Form ST-50 for quarterly filers. Every registered seller files the quarterly ST-50; high-volume sellers also remit monthly payments on Form ST-51, a payment voucher that does not replace the quarterly return. The quarterly return is due on the 20th day of the month after each calendar quarter ends. Filing late risks a penalty of 5% of the tax due per month (capped at 25%). NJ may also charge $100 for each month the return is late — even on a zero-tax return. Source: NJ Division of Taxation — Sales and Use Tax.

None of the 2026 or early-2027 due dates fall on a weekend, so no rollovers apply. If a future due date lands on a weekend or state holiday, NJ accepts the return on the next business day. Monthly ST-51 payments follow a different schedule: each month's payment is due the 20th of the following month (per NJ Division of Taxation filing information). They are required only when a business collected more than $30,000 in NJ sales and use tax in the prior calendar year AND collected more than $500 in the first or second month of the current quarter. The quarterly ST-50 return is still required of every filer. Out-of-state sellers with NJ economic nexus under South Dakota v. Wayfair file under the same quarterly schedule once registered.

ProAxis files NJ sales tax returns as part of bookkeeping and tax-prep engagements for Bergen County retailers, e-commerce sellers, and restaurants. For multi-state sales tax compliance (Wayfair nexus across 45 states), see our e-commerce multi-state tax page.

If You Have Already Missed a Deadline

It is rarely as bad as it looks the morning you realize it. The IRS first-time penalty abatement program may waive failure-to-file and failure-to-pay penalties for taxpayers who meet its conditions, including a clean three-year compliance history and being current on filing and payment. Relief is discretionary, not automatic — and we prepare that request routinely for new clients who arrive with their first late-filing penalty, for them to sign and submit. New Jersey and New York have analogous voluntary-disclosure and abatement programs, though they are more discretionary and less generous than the federal version.

The two things you should not do, ever, are (a) ignore the notice, and (b) call the IRS directly without preparation. The penalty for ignoring a notice is that it escalates from a CP14 to a CP504 to a Notice of Federal Tax Lien, at which point your options narrow significantly. The risk of calling unprepared is that the agent on the other end is not your representative — anything you say can be used to support an assessment, and you can inadvertently extend the assessment statute of limitations.

If you are facing an active notice, our IRS tax resolution practice prepares abatement requests, installment-agreement requests, and offer-in-compromise filings for you to sign and submit. ProAxis does not represent taxpayers before the IRS, and refers matters that require representation to a licensed representative. Most missed-deadline situations are resolvable without the offer-in-compromise route — that one only makes sense for a narrow set of facts and we will tell you so.

Estimated Taxes — the Quietly Expensive Deadline

The four estimated-tax deadlines (April 15, June 15, September 15, January 15 of the following year) are responsible for more underpayment penalties than any other single deadline on the calendar. They are also the most commonly misunderstood. The IRS does not require you to pay your full tax liability ratably across the year. The safe-harbor rules say you avoid penalty if you pay either 90% of the current year's tax or 100% of last year's tax (110% if AGI exceeded $150,000). Most W-2 earners with simple returns rely on payroll withholding to satisfy the safe harbor without thinking about it. Self-employed individuals, S-Corp owners taking distributions, retirees living on portfolio income, and high-W-2 earners with significant outside income are the ones who routinely run into estimated-tax shortfalls.

For ProAxis tax-planning clients, we calculate quarterly estimates each year as part of the engagement and adjust them mid-year if income materially shifts. For clients who only engage for tax preparation, we provide voucher amounts based on the current return as part of the deliverable but cannot guarantee they remain correct if circumstances change — which is why a planning engagement is usually the more efficient choice for anyone whose income varies meaningfully year over year.

Frequently Asked Questions

This calendar is general information, not tax advice, and does not create a CPA-client relationship. Deadlines shift when they fall on weekends or holidays; confirm specific dates with your CPA.

Never Miss a Deadline — Talk to a CPA

Tell us about your filing situation. A licensed NJ/NY CPA follows up within 2–3 business days. Virtual-first, no obligation.