Paid script
New Jersey Sales Tax Splitter for Online Sellers
Drop in your order exports and see which sales the marketplace already taxed, which NJ sales you owe 6.625% on, and what to put on each quarterly ST-50.
Paid script
NJ Sales Tax Splitter
Buy this script on its own for $39, one time. No membership needed. It runs on your own computer and nothing you enter leaves it. Read how it works and the questions below first.
The Automation Suite includes this and 10 more tools for $99. Members get this included. See the membership or sign in. Already bought it? Email me my access link.
How it works
How it works
Export orders from Shopify, Etsy, Amazon, eBay or Square (or any CSV with date, amount, tax and state). The script detects each platform from its headers and puts every line in one bucket: marketplace facilitator (the platform collected and remitted NJ tax), your own NJ taxable sales, NJ exempt items such as most clothing (from an editable keyword list), or out-of-state. It totals each quarter for the ST-50 with tax due at 6.625% next to the tax you actually collected and the due date, flags the $30,000 monthly-payment threshold, and lists sales by destination state with warnings when a state nears an economic-nexus threshold you can edit. Everything runs on your computer.
FAQ
About this calculator
What do I need to run it?
Python 3.9 or newer (free from python.org) and your order export files. No other installs, no account, and no internet connection is needed.
Which exports does it read?
Shopify order exports, Etsy sold orders or sold order items, Amazon order reports (tab or comma separated), eBay order reports, Square item details, and a generic CSV with date, amount, tax, state and channel columns.
How does it know what is exempt?
It uses an editable keyword list. By default clothing and footwear are exempt and accessories like jewelry, handbags and watches are taxable, following the NJ Division of Taxation clothing guidance. Review the matched rule shown for each line.
Is this tax advice?
No. It sorts and totals your data using published NJ rates and rules so you can prepare or check a return. Confirm the figures on nj.gov or with a tax professional before filing.
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General information, not tax or legal advice. How we write and check our tools.