The main New Jersey sales tax forms are NJ-REG to register your business, ST-50 for quarterly returns, ST-51 for monthly payment vouchers when your volume is high enough, the ST-3/ST-4/ST-5/ST-8 exemption certificates you collect from tax-free buyers, and UZ-50 for businesses operating inside an Urban Enterprise Zone. Each one has its own trigger and its own deadline, and the state charges 6.625% sales tax on most tangible goods and certain services, so getting the paperwork right is how you stay on the correct side of the Division of Taxation.
Register First With Form NJ-REG
Every business planning to sell taxable goods or services in New Jersey files Form NJ-REG at least 15 business days before it starts operating. The filing creates your tax identity with the state and produces a Certificate of Authority, which is your legal permission to collect sales tax from customers. There is no fee.
You submit NJ-REG through the New Jersey Division of Revenue and Enterprise Services website. The form asks for your Federal Employer Identification Number, legal business name, entity type, planned start date, and the specific taxes you expect to collect. Select “Sales and Use Tax” to flag the 6.625% obligation. Without the Certificate of Authority in hand, you cannot legally collect sales tax, so building in that 15-business-day cushion before your first sale is not optional.
File Quarterly on Form ST-50
Form ST-50 is the standard quarterly sales and use tax return, and every registered business files it. One return covers three months of activity and reports your total gross receipts, taxable sales, exempt sales, and any use tax you owe on items purchased for business use without New Jersey tax having been charged at the time of purchase.
Use tax catches more businesses than they expect. Anything you buy from an out-of-state vendor who doesn’t charge New Jersey tax creates a 6.625% use tax liability that you report on ST-50 alongside your collected sales tax.
Quarterly returns are due by the 20th of the month after the quarter ends: April 20, July 20, October 20, and January 20. If the 20th falls on a weekend or legal holiday, the deadline moves to the next business day. You file through the state’s online portal using your 12-digit New Jersey Taxpayer Identification Number.
Add Monthly ST-51 Vouchers When You Hit the Thresholds
Higher-volume businesses make payments between quarterly returns using the ST-51 monthly remittance voucher. You’re required to file ST-51 only when both of these are true:
- Your total New Jersey sales and use tax collected during the prior calendar year was more than $30,000, and
- The tax due for the first or second month of the current quarter is more than $500.
Both conditions have to be met in the same month. A business that collected $40,000 last year but owes only $300 in a given month skips the voucher for that month. Monthly vouchers are due by the 20th of the following month. You never file an ST-51 for the third month of a quarter; the full ST-50 quarterly return covers that month and reconciles the whole quarter.
Collect the Right Exemption Certificate From Tax-Free Buyers
Not every sale triggers the 6.625% tax. When a buyer qualifies for an exemption, they give the seller a completed certificate at the time of purchase. New Jersey uses several, and each covers a specific situation.
Form ST-3: Resale Certificate
Form ST-3 lets a retailer or manufacturer buy goods tax-free when the goods will be resold or built into a product for sale. A furniture maker buying lumber hands the lumber supplier a completed ST-3 instead of paying sales tax. The certificate must list the buyer’s New Jersey Taxpayer Identification Number and describe the goods being purchased for resale.
Form ST-4: Exempt Use Certificate
Form ST-4 covers purchases that will be used for a purpose New Jersey law specifically exempts. The buyer has to identify the exact statutory subsection that authorizes the exemption. Qualifying government purchases and goods used in a manufacturing process that falls under a statutory exemption are the common examples.
Form ST-5: Exempt Organization Certificate
Nonprofits that have been granted exempt status by the Division of Taxation present Form ST-5 when they buy. The Division issues ST-5 directly to the qualifying organization, so if a buyer hands you one, check that it is current and that it matches the organization actually making the purchase.
Form ST-8: Capital Improvement Certificate
A property owner gives Form ST-8 to a contractor when the work qualifies as an exempt capital improvement, meaning work that increases the value or extends the useful life of real property. With a properly completed ST-8 in hand, the labor portion of the contractor’s bill is exempt from sales tax. The contractor still pays sales tax on the materials.
Keep Certificates on File
You do not send exemption certificates to the Division of Taxation. You keep every certificate on file for at least four years from the date of the last transaction it covers. During an audit, the Division will ask to see them to verify that your exempt sales were legitimate. A seller who can’t produce a properly completed certificate can be held liable for the uncollected tax on that sale.
Use UZ-50 Inside an Urban Enterprise Zone
Qualified businesses operating in one of New Jersey’s Urban Enterprise Zones collect sales tax at a reduced rate of 3.3125%, exactly half the standard rate. These businesses file Form UZ-50 monthly, due by the 20th of the month after each reporting period. A business operating both inside and outside a UEZ files UZ-50 for its UEZ sales and ST-50 for everything else.
If You Sell Into New Jersey From Out of State
Out-of-state businesses aren’t automatically outside the system. If your gross revenue from sales delivered into New Jersey exceeds $100,000, or you completed 200 or more separate transactions delivered into the state during the current or prior calendar year, you have to register, collect, and remit New Jersey sales tax the same as a local business.
Marketplace facilitators carry their own obligation. Since November 1, 2018, any marketplace facilitator that enables third-party sales to New Jersey buyers — Amazon, Etsy, and similar platforms — must collect and remit sales tax on those transactions. The facilitator handles the tax whether or not the individual seller has its own Certificate of Authority, and the Division audits the facilitator rather than each marketplace seller for those sales.
Deadlines, Payment, and What Lateness Costs
Every sales tax return and voucher shares one deadline rule: the 20th of the month following the reporting period. Businesses that meet the ST-51 thresholds file two monthly vouchers and one quarterly ST-50 per quarter; everyone else files only the four quarterly ST-50 returns.
You file and pay through the Division of Taxation’s online portal. Businesses whose prior-year liability in any single tax reached $10,000 or more are required to pay electronically through the Electronic Funds Transfer program. Smaller businesses can use EFT voluntarily or pay by credit card through the portal for a convenience fee. After you submit a return and payment, the system generates a confirmation number. Save or print it as your proof of timely filing.
Missing a deadline stacks several penalties on the same return:
- A late filing penalty of 5% of the tax due for each month or partial month the return is late, capped at 25%. The Division may also charge $100 for each month the return is overdue.
- A late payment penalty of an additional 5% of the unpaid tax balance.
- Interest at the prime rate plus 3%, compounded annually. At the end of each calendar year, unpaid tax, penalties, and interest all roll into the balance that then accrues further interest.
- An 11% referral cost recovery fee added to the outstanding balance if your debt is referred for collection.
A $10,000 return filed three months late carries $1,500 in late filing penalty and $500 in late payment penalty before interest, and before any referral fee. A calendar reminder on the 20th of each relevant month is the cheapest compliance tool you have.