POS Software for US Small Businesses: Sales Tax, Card Payments and Stock Control
In the United States there is no single sales tax and no single way customers pay. Rates vary by state, county and city, customers tap cards, Apple Pay, and Cash App as readily as they hand over cash, and many small businesses sell in person and online. Here is what a US small business should look for in a point of sale and inventory system.
Sales tax is local, and that matters for software
There is no federal sales tax. States, and often cities and counties, set their own rates and decide what is taxable. Since the 2018 Supreme Court decision in South Dakota v. Wayfair, a business can also owe sales tax in a state where it has no physical presence once it passes that state's economic nexus threshold, often $100,000 in sales, though thresholds differ by state.
In RetailMatrix you set the tax rate used on your sales and mark which products are taxable. It does not determine rates automatically by address or track multi-state nexus, so if you sell across state lines use a dedicated tax tool or your accountant for that part and use RetailMatrix for clean, itemised sales records.
Card payments: Stripe, Square and PayPal
Card acceptance is where US POS products differ most. Some require you to use their own hardware and processing; others let you bring your own provider.
RetailMatrix lets you connect your own Stripe or PayPal account so money lands directly with you, and you can also record sales taken on a separate card reader. You are not locked into a single processor.
Venmo, Zelle, Cash App and Apple Pay at the register
Plenty of small US businesses, from market stalls to repair shops, are paid by Venmo, Zelle, Cash App or Apple Pay. If your POS only knows cash and card, those payments get noted on paper and lost at the end of the day.
RetailMatrix lets you add the payment methods you actually accept under Settings, Payment Methods. Add Venmo, Zelle or Cash App once and each appears in the Payment Method dropdown on every sale, with an optional reference field for the transaction ID. They are recorded manually at the register; there is no live connection to those apps. You can delete a method any time, and past sales keep its name.
Inventory, returns and staff
Retail returns are routine in the US. Look for returns handled against the original sale with stock and refund amount tracked automatically, low-stock alerts, supplier purchase orders, and staff logins with permissions so only the owner sees cost and profit.
If you sell online as well, two-way stock sync with WooCommerce or Shopify helps keep your stock count accurate on both channels.
A short checklist for a US small business
- Can you set a sales tax rate and mark products taxable or exempt?
- Can you add Venmo, Zelle, Cash App or Apple Pay to the payment dropdown?
- Can you use the card processor you already have, without being locked in?
- Do returns restore stock and record the refund against the original sale?
- Does stock sync with your online store?
- Is there a free trial before you commit?
Where RetailMatrix fits, and where it does not
RetailMatrix suits independent retailers, repair shops, boutiques, wholesalers and service businesses that want sales, quotes, invoices, clients and stock in one browser-based system, with a 14-day free trial and no card required. It needs an internet connection while you sell, it does not calculate tax by address or manage multi-state nexus, and it does not supply card hardware.
Frequently asked questions
Does RetailMatrix calculate sales tax automatically by address?
No. You set the tax rate used on sales and mark products as taxable. For multi-state selling, use a dedicated tax tool or your accountant for rates and nexus.
Can I accept Venmo or Zelle through RetailMatrix?
You can add Venmo, Zelle, Cash App or any other method to the Payment Method dropdown so every sale is recorded against the right one. The payment itself happens in that app, and RetailMatrix records it manually.
Which card processors can I use?
You can connect your own Stripe or PayPal account, or record sales taken on your own separate card reader.
What is economic nexus?
Since South Dakota v. Wayfair (2018), a seller can owe sales tax in a state where it has no store once its sales into that state pass a threshold set by the state, often $100,000. Thresholds vary, so check each state.
Try it on your own products, free for 14 days
No card required. Add your products, set your tax rate and payment methods, and ring up a real sale in minutes.
Start Your Free Trial See all featuresThis guide is general information, not tax, legal or accounting advice. Tax rates, thresholds and rules change, so confirm your own obligations with your tax authority or a qualified accountant.