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Sales Tax Calculations

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It depends on where your customers are located, what you’re selling, and whether you have “nexus” (a tax obligation) in that state — which can be triggered by physical presence, employees, inventory, or simply crossing a sales volume threshold in a state, even without a physical location there. This is usually the first thing to sort out before anything else about rates or filing matters.
Since a 2018 Supreme Court ruling, most states can require you to collect sales tax once you cross a certain sales or transaction threshold there, even with no physical presence. Tracking this across states is one of the most common reasons online sellers bring in a CPA — the thresholds and rules differ by state, and it’s easy to unknowingly cross one.
Rates can vary not just by state but by county, city, and sometimes even by the specific product category, so the “correct” rate often isn’t a single number you can look up once and reuse. A CPA experienced in sales tax can help you set up calculations that stay accurate as rates and jurisdictions change.
This is more common than you’d think, and it’s fixable. A CPA can help you quantify the exposure, determine whether a voluntary disclosure agreement makes sense to limit penalties, and get you compliant going forward without guessing at what you owe.
No — many states tax certain goods or services differently, and some categories are exempt entirely depending on the state. If you sell a mix of products, services, or digital goods, this is worth confirming rather than assuming one rate applies across the board.
Filing frequency is usually assigned by each state based on your sales volume there, and it can range from monthly to annually — and it’s not unusual to have different frequencies in different states you’re registered in. Missing a state’s specific deadline is a common (and avoidable) source of penalties.
A sales tax audit typically looks at whether you’ve collected and remitted the correct amounts across your taxable jurisdictions, and outcomes range from a clean result to significant back taxes, interest, and penalties depending on what’s found. Having accurate calculations and documentation in place beforehand is the best way to reduce that risk.
Cost depends on how many states and jurisdictions you’re dealing with, whether there’s a backlog or exposure to sort out first, and whether you need one-time setup or ongoing support. We’ll match you with a CPA who can scope your specific situation and quote accordingly.
We look for CPAs with real, current experience in multi-state sales tax compliance and nexus determination — not just general accounting experience — since the rules here shift often and mistakes get expensive fast. Then we personally match you with someone whose background fits your specific situation.
Nothing. CPAHunter is free to use — we’re only paid by the CPA if we make a successful match, and whether you move forward from there is entirely up to you.

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