Resource guide · Sales tax
Sales tax compliance: a plain-English guide for small business.
Sales tax compliance is the full loop of getting a state’s tax right — knowing where you owe it (nexus), registering there, charging the correct rate, filing and remitting on schedule, and keeping exemption certificates on file. Since the 2018 Wayfair decision, selling online can create obligations in states you’ve never set foot in. This guide walks the pieces in plain English, shows the steps to stay compliant, and is honest about where the work crosses from bookkeeping into a CPA or sales-tax specialist’s lane. Independent firm, not affiliated with Intuit Inc.
Sales tax compliance means correctly handling a state’s sales tax across its whole lifecycle: determining where you have nexus (an obligation to collect), registering for a permit in those states, charging the right rate at the point of sale, filing returns and remitting the tax on each state’s schedule, and retaining valid exemption certificates for any non-taxable sales. Since South Dakota v. Wayfair (2018), a state can require you to collect based on economic activity alone — not just a physical presence — so a growing online seller can cross thresholds in many states without realizing it. The operational side — configuring QuickBooks, tracking the liability, and reconciling filings — is bookkeeping work; the legal nexus determination and the returns themselves are confirmed with a CPA, EA, or sales-tax specialist.
Reference maintained by the Certified QuickBooks ProAdvisor team at TechBrot Inc., an independent firm — not Intuit, and not a law or tax-advisory firm. Educational only; not legal or tax advice. Not affiliated with Intuit Inc.
Sales tax compliance in five questions.
What is sales tax compliance?
It’s the full loop of handling a state’s sales tax correctly: determining where you have nexus (an obligation to collect), registering for a permit in those states, charging the right rate at the point of sale, filing returns and remitting the tax on each state’s schedule, and keeping valid exemption certificates for non-taxable sales. Getting any one piece wrong — right rate but late filing, or registered but undercollecting — breaks compliance.
What is sales tax nexus, and what changed after Wayfair?
Nexus is the connection to a state that legally requires you to collect and remit its sales tax. It is created by physical presence (an office, employees, or inventory) or, since the 2018 South Dakota v. Wayfair decision, by economic activity alone — crossing a state’s dollar or transaction threshold even with no physical presence. That is why online sellers can owe sales tax in many states at once.
How do I charge the correct sales tax rate?
The rate depends on where the sale is taxed — usually the customer’s location — and combines state, county, city, and special-district rates, which differ by address and change over time. QuickBooks’ automated sales tax calculates a rate based on the address and product taxability; the work is configuring it correctly and checking that products and customers are mapped right. We don’t publish or invent specific state rates — they’re set per jurisdiction and change.
How often do I file and remit sales tax?
Each state assigns a filing frequency — commonly monthly, quarterly, or annually — based on how much tax you collect, and the deadline and frequency vary by state and can change. You file a return reporting what you collected and remit the tax even in periods with no sales (a “zero return” is often still required). Missing a deadline triggers penalties and interest, so tracking the calendar per state matters.
Does TechBrot determine my nexus or file my returns?
No. We do the operational work inside your books — configuring sales tax in QuickBooks, tracking the liability, and reconciling your filings. The legal determination of where you have nexus, your registrations, and the returns themselves are confirmed with your CPA, EA, or a sales-tax specialist. We are an independent firm and do not provide legal or tax advice; we coordinate with your tax professional.
What “sales tax compliance” actually means.
Sales tax compliance is the ongoing work of collecting and remitting the right amount of sales tax to every state that has a claim on your sales. It is not a single task but a loop: figure out where you have an obligation to collect (that connection is called nexus), register for a sales-tax permit in each of those states, charge the correct rate when you make a sale, file a return and pay over what you collected on each state’s schedule, and keep a valid exemption certificate on file for any sale you didn’t tax. Miss any one of those and the compliance breaks — you can be registered in a state but filing late, or collecting tax but at the wrong rate.
The reason this is harder than it used to be is the 2018 Supreme Court decision in South Dakota v. Wayfair. Before Wayfair, a state could generally only make you collect its sales tax if you had a physical presence there. After it, states can require collection based on economic activity alone — cross a dollar or transaction threshold and you have nexus, even with no office, employee, or inventory in the state. That is why a growing online business can quietly pick up filing obligations in a dozen states. The operational pieces — configuring QuickBooks, tracking the liability, reconciling what you filed — are bookkeeping work we handle. The legal call on where you have nexus, and the returns themselves, are confirmed with your CPA, EA, or a sales-tax specialist. This page is educational, not legal or tax advice.
The pieces of sales tax compliance.
Six pieces have to be right at once. The step-by-step system below walks them in the order you’d actually tackle them.
Piece 01 · Nexus — where you owe
Nexus is the connection to a state that obligates you to collect its sales tax. It comes from physical presence (an office, employees, inventory, even inventory in a marketplace warehouse) or, since Wayfair, from economic activity above a state’s threshold. The legal determination of where you have nexus is the foundation everything else rests on — and the piece most often confirmed with a CPA or sales-tax specialist.
Piece 02 · Registration — getting a permit
Once you have nexus in a state, you generally must register for a sales-tax permit there before you start collecting — collecting tax without a permit is itself a problem in many states. Each state has its own registration process and may assign a filing frequency at sign-up. Registering across many states is the kind of multi-state task we coordinate with your tax professional.
Piece 03 · Rates — charging the right amount
The correct rate depends on where the sale is taxed (usually the customer’s address) and stacks state, county, city, and special-district rates that vary by location and change over time. Whether a given product or service is even taxable also varies by state. QuickBooks’ automated sales tax computes a rate from the address and product mapping — the work is configuring and verifying it, not memorizing rates.
Piece 04 · Collection — at the point of sale
Compliance means actually charging the tax on taxable sales and recording it as a liability you owe the state, not revenue you keep. That means your invoices, your point-of-sale, and any sales channels (web store, marketplaces) all need to apply tax consistently and flow into the books, so what you collected is tracked accurately against what you’ll owe.
Piece 05 · Filing & remitting — on each state’s schedule
You file a return reporting what you collected and remit the tax on the frequency each state assigns — commonly monthly, quarterly, or annually, and often a zero return is still required when there were no sales. Deadlines, frequencies, and forms differ by state and change. Reconciling each filing back to what the books show was collected is core operational work.
Piece 06 · Exemption certificates — for non-taxable sales
Some sales are exempt — resale, certain nonprofits, certain products — but the exemption only holds if you collect and retain a valid exemption certificate from the buyer. Missing or expired certificates are a common audit finding, because the state can assess the tax you didn’t collect. Tracking certificates is part of keeping the books defensible.
How to stay sales-tax compliant, step by step.
Six steps, in order. The first two are decisions you confirm with a tax professional; the rest is the operational work that lives in your books. If multi-state nexus is in play, stop and coordinate before you register everywhere.
Map where you likely have nexus
List every state where you have a physical presence (office, staff, inventory, including marketplace warehouses) and pull your sales by state to see where economic activity may have crossed a threshold. Treat this as a draft to confirm — the legal nexus determination is something to verify with your CPA, EA, or a sales-tax specialist before you act on it.
Register before you collect
In each state where nexus is confirmed, register for a sales-tax permit before charging tax there. Note the filing frequency the state assigns at registration. Registering across several states at once is the kind of multi-state work we coordinate with your tax professional rather than handle as legal advice.
Configure sales tax in QuickBooks
Turn on and set up automated sales tax in QuickBooks: add the states where you’re registered, set product and service taxability, and map customers (including exempt ones). This is the operational heart of what we do — getting the configuration right so the correct rate is calculated by address rather than entered by hand.
Collect and record the tax as a liability
Make sure every sales channel — invoices, point-of-sale, web store, marketplaces — applies tax to taxable sales and that the tax flows into QuickBooks as a liability you owe, not as income. Consistent collection across channels is what keeps the tracked liability accurate against what you’ll remit.
File and remit on schedule, then reconcile
File each state’s return and remit the tax by its deadline — including zero returns where required — then reconcile what you filed back to what the books show was collected. Catching a gap between collected and remitted early is far cheaper than at audit. We reconcile filings in the books; the returns themselves are confirmed with your tax professional.
Keep exemption certificates and re-check nexus over time
Collect and retain a valid exemption certificate for every non-taxable sale, and watch for expirations. As sales grow, periodically re-run the nexus map — new states get crossed quietly — and confirm any new obligation with your CPA or sales-tax specialist before registering and collecting there.
Three signs it’s time to bring in help.
You’re selling into many states
Once your sales reach customers across many states — especially through a web store or marketplaces — the odds of having crossed an economic-nexus threshold somewhere climb fast. That’s the moment to map nexus deliberately and confirm it with a sales-tax specialist before unremitted tax accumulates.
Filings no longer tie to the books
If what you’ve been remitting doesn’t reconcile to what QuickBooks shows you collected — or you’re behind on filings in one or more states — the liability is drifting. That’s operational cleanup work: getting the configuration, the tracking, and the reconciliation back in order.
An audit notice or back-tax exposure
A state notice, a registration you missed for years, or a suspicion that you should have been collecting somewhere all point to potential back-tax exposure. That is squarely CPA and sales-tax-specialist territory — we get the books clean and coordinate; we don’t give the legal or tax advice that situation needs.
Crossing thresholds in states you can’t track?
A Certified ProAdvisor sets sales tax up correctly in QuickBooks, tracks the liability, and reconciles your filings — coordinating the multi-state nexus determination and the returns with your CPA or a sales-tax specialist. Independent firm, written scope first.
We keep the books and the collection right; your CPA confirms the law.
Sales tax compliance splits cleanly into two kinds of work, and being honest about the line protects you. The operational side lives in your books: configuring sales tax in QuickBooks so the right rate is charged, mapping products and customers, tracking the liability as it accrues, and reconciling each filing back to what was actually collected. That is what a Certified QuickBooks ProAdvisor does against a written scope. The other side is judgment and licensure: the legal determination of where you have economic or physical nexus, the registrations, and the returns themselves — that belongs with a CPA, EA, or a sales-tax specialist. We coordinate with your tax professional rather than substitute for one. Independent firm — not Intuit, and not a provider of legal or tax advice.
We configure
sales tax set up, tracked & reconciled in your QuickBooks
We coordinate
complex nexus & returns confirmed with your CPA or specialist
Independent
Certified ProAdvisor firm — not Intuit, not legal or tax advice
What people ask about sales tax compliance.
Is this Intuit’s official support, or legal and tax advice?
What is sales tax nexus?
What did South Dakota v. Wayfair change?
What are typical economic nexus thresholds?
How do I charge the correct sales tax rate?
How often do I have to file and remit sales tax?
What is an exemption certificate and why does it matter?
Does TechBrot determine my nexus or file my sales tax returns?
What does it cost to get sales tax set up right?
Selling into more states than you can track?
Get your sales tax set up right in QuickBooks.
If you’re collecting in a handful of states, unsure where you’ve crossed a threshold, or staring at filings that no longer tie to the books, start with the discovery call. We configure sales tax in QuickBooks, track the liability, and reconcile your filings — coordinating the complex multi-state nexus determination and the returns with your CPA or a sales-tax specialist. Independent ProAdvisor firm, written scope before any work begins.