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How did the Wayfair decision change sales tax requirements?

Before 2018, you only had to collect sales tax in states where your business had a physical presence. A warehouse, office, employee, or even inventory stored in a fulfillment center could create that obligation. But selling to customers across state lines from your home office or through a website? No requirement to collect their state’s sales tax.

The Supreme Court’s ruling in South Dakota v. Wayfair changed everything. The court decided that economic activity alone could create a sales tax collection obligation, even without any physical connection to a state. This concept is called economic nexus.

Now most states require you to collect and remit sales tax once you exceed certain thresholds within their borders. The common threshold is $100,000 in sales or 200 transactions within a calendar year, though some states have dropped the transaction count and only use the sales amount. Each state sets its own rules and can change them at any time.

For online sellers, this created a significant compliance burden. A business selling nationwide might trigger nexus in dozens of states. Each state has different tax rates, different rules about which products are taxable, different filing frequencies, and different registration requirements. You can’t just collect one rate and send it somewhere.

The practical impact depends on your business model. If you only sell locally within Massachusetts and the Merrimack Valley, the Wayfair decision might not affect you directly. If you sell through Shopify, Amazon, or your own website to customers across multiple states, you’re likely dealing with economic nexus in several jurisdictions right now.

Tracking where you’ve crossed thresholds requires ongoing monitoring. You need to know your sales by state, register with tax authorities when you hit thresholds, configure correct rates in your sales platform, file returns on each state’s schedule, and keep up with rule changes. A small business bookkeeping service can help track your state-by-state sales and flag when you’re approaching nexus triggers.

Software like TaxJar or Avalara can automate calculations and filing, but only if someone configures it correctly and monitors threshold crossings. The software doesn’t handle registration or catch errors without proper oversight.

If you’re already selling in multiple states and haven’t addressed sales tax compliance, you may have back-tax exposure. States are increasingly aggressive about finding out-of-state sellers who should be collecting. Getting compliant now is better than receiving a notice and owing years of uncollected tax plus penalties.

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More Questions

Should I start over with new books or fix my existing records?

In most cases, fixing your existing records is the better choice. Starting over sounds appealing but doesn't erase tax obligations or the need for historical documentation. The right answer depends on how far behind you are and what's actually wrong.

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How do I separate personal and business finances?

Open a dedicated business bank account and use it exclusively for business transactions. Get a business credit card, pay yourself through regular documented transfers, and track everything through accounting software from day one.

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How do I track business expenses effectively?

Use separate business accounts, capture receipts digitally the same day, categorize expenses in your accounting software as they happen, and reconcile weekly instead of monthly. Consistency matters more than perfection.

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How do I account for returns and refunds in e-commerce?

Returns reduce your revenue, not increase your expenses. Record them in a contra-revenue account so your net sales reflect what you actually kept. Reconcile with your platform reports monthly to catch timing differences and fee handling.

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What records do I need to keep for my small business?

Keep financial records, tax documents, employment files, business formation papers, contracts, and insurance policies. Most tax-related records should be kept for seven years, while formation documents and insurance policies should be kept permanently.

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How do I handle tip reporting for restaurant employees?

Employees report tips to you monthly, and you withhold taxes through payroll. Credit card tips track automatically through your POS, but cash tips require employee reporting. Large restaurants have additional Form 8027 filing requirements.

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