NJ Tax Deadlines 2025-2026 — Income, Sales & Quarterly

NJ Quarterly Sales Tax Due Dates (2025-2026)

New Jersey sales tax is reported on Form ST-50 for quarterly filers. The state requires quarterly filing for most businesses; high-volume sellers move to monthly filing on Form ST-51. The quarterly return is due on the 20th day of the month after each calendar quarter ends — so a missed Q1 means a $50 minimum late fee even on a zero-tax return. Source: NJ Division of Taxation — Sales and Use Tax.

If a due date lands on a weekend or state holiday, NJ accepts the return on the next business day. Monthly filers (ST-51) follow a different schedule. Businesses with sales tax liability above $30,000 in the prior year are required to file monthly. 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 will waive failure-to-file and failure-to-pay penalties for taxpayers with a clean three-year compliance history — and we apply for it routinely on behalf of new clients who arrive with their first late-filing penalty. 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 handles abatement requests, installment agreements, and offer-in-compromise filings. 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.