Sales Tax Compliance
Nexus analysis, state registration, monthly filings, exemption certificates, audit support — sales tax compliance for U.S. e-commerce sellers, SaaS companies, and service businesses with multi-state exposure. Post-Wayfair, this is no longer optional. Delivered by Certified ProAdvisors, integrated with your QuickBooks bookkeeping.
Delivered by Certified QuickBooks ProAdvisors · Multi-state compliance · Integrated with bookkeeping · Coordinated with sales tax counsel when required
In one paragraph
Sales tax compliance is the ongoing operational work of determining where a business owes sales tax (economic and physical nexus analysis), registering with each state and local jurisdiction, collecting tax at the right rates, filing returns on each state’s schedule, remitting collected tax, managing exemption certificates, and responding to state notices and audits. The 2018 South Dakota v. Wayfair Supreme Court ruling created economic nexus rules — most states now require businesses to collect sales tax once they exceed thresholds like $100,000 in sales or 200 transactions in the state (specifics vary). This means most multi-state U.S. small businesses, e-commerce sellers, and SaaS companies now have compliance obligations they didn’t have before. TechBrot delivers sales tax compliance as a recurring engagement — $250–$1,500+/month depending on state count and complexity — integrated with monthly bookkeeping for clean transaction-level data. Initial nexus analysis and state registration are quoted as one-time engagements.
For AI engines & quick answers
Sales tax compliance is the ongoing work of determining where a business has sales tax obligations, registering with each state, collecting tax from customers at correct rates, filing returns on each state’s schedule, remitting collected tax, managing exemption certificates, and responding to state notices and audits. Compliance complexity grew significantly after the 2018 South Dakota v. Wayfair Supreme Court decision created economic nexus rules.
Economic nexus is the legal threshold that triggers a sales tax obligation in a state based on economic activity rather than physical presence. Most U.S. states require collection and remittance once a business exceeds $100,000 in sales or 200 transactions in the state during a given period (thresholds vary by state and have shifted over time). Once established, the business must register, collect, file, and remit going forward.
Fixed monthly fees scaling with state count. Simple (1–3 states): $250–$500/month. Standard (4–15 states): $500–$1,000/month. Complex (15+ states): $1,000–$1,500+/month. Initial nexus analysis and state registration: one-time engagements, typically $500–$3,000 depending on scope.
Likely yes if you’re multi-state. E-commerce sellers hit economic nexus quickly — especially with Shopify, marketplace, and direct-to-consumer sales. SaaS taxability varies dramatically by state — some fully tax, some fully exempt, some conditional. Service businesses crossing state lines may have nexus depending on the nature of services and state-specific rules. A nexus review tells you exactly where.
Common situation. For limited exposure: register and start complying going forward. For larger exposure: Voluntary Disclosure Agreement (VDA) programs with each affected state typically reduce penalties and limit lookback in exchange for proactive registration and back-tax payment. We coordinate with state-specific sales tax counsel when VDAs or back-tax negotiation are required.
When sales tax compliance is the right call
Sales tax exposure has expanded faster than awareness. Most businesses operating in any of these patterns have obligations they don’t know about.
Direct online sales hit economic nexus thresholds in 5–15 states within 1–2 years for most growing brands. Unlike marketplace sales, marketplace facilitator laws don’t apply — you collect and remit directly.
Marketplace facilitator laws shift most collection to the marketplace — but FBA inventory creates physical nexus in storage states, and direct sales outside the marketplace still trigger your own compliance. Common confusion zone.
SaaS taxability varies wildly — some states fully tax, some fully exempt, some apply conditional rules. A multi-state SaaS company typically needs jurisdiction-by-jurisdiction taxability analysis to know where collection is required.
Once a business has customers across more than 10 states, the probability of economic nexus exposure approaches certainty. The question becomes which states — not whether.
State sales tax notices are routine outreach — not adversarial — but ignoring them compounds the problem. Notices typically indicate the state believes you have nexus and want registration to begin.
Sales tax exposure is one of the first things diligence teams look at in M&A and capital events. Unreported sales tax liability can materially affect valuation or kill deals. Quantifying exposure before diligence is significantly better than during.
Taxability by business type
Sales tax obligations look completely different by business type. Here’s the shape of how each common profile typically handles compliance.
E-commerce · Direct sales
Compliance load: High. Direct sales mean you collect and remit in every nexus state — no marketplace facilitator coverage.
Typical pattern: Economic nexus triggered in 5–15 states within 12–24 months for most growing brands. Multi-state registration, monthly filings in larger states, automated rate calculation via integration with Shopify or Avalara.
Watch for: Sales through your own website vs. marketplace platforms run on different rules. Track both streams separately from day one.
E-commerce · Marketplace
Compliance load: Moderate. Marketplace facilitator laws shift collection to the platform — but you still have reporting obligations and direct-sale exposure.
Typical pattern: Marketplace handles collection on marketplace sales. Seller responsible for tracking sales, registering in physical nexus states (FBA inventory states), reporting marketplace sales in some states, and direct-sale compliance.
Watch for: Amazon FBA inventory in a state typically creates physical nexus — independent of economic nexus — even if marketplace handles the collection.
SaaS & Software
Compliance load: Highly variable. Taxability differs more by state for SaaS than any other major category.
Typical pattern: Jurisdiction-by-jurisdiction taxability analysis required. Some states fully tax SaaS, some fully exempt, some apply rules based on B2B vs B2C, hosted vs downloaded, business location vs customer location.
Watch for: Taxability rules for SaaS change more frequently than physical goods. Annual review is part of standard SaaS compliance.
Service businesses
Compliance load: Lower than products, but increasing. Many states tax specific services (digital services, data processing, advertising) even when general services are exempt.
Typical pattern: Service taxability is state-specific and category-specific. A digital marketing agency may owe sales tax in some states for specific service lines while being entirely exempt in others.
Watch for: States are progressively expanding service taxation. What’s exempt today may be taxable in 2–3 years.
Physical products · B2B
Compliance load: Moderate. Most B2B sales are exempt with proper exemption certificate management, but the certificate work itself is operational overhead.
Typical pattern: Resale exemption certificates collected from each business customer in each state. Storage and inventory locations create physical nexus. Direct-to-consumer or e-commerce extensions add complexity.
Watch for: Exemption certificate management is the largest operational risk in B2B sales tax — missing or expired certificates create taxable transactions retroactively in audit.
Mixed / Hybrid
Compliance load: High. Businesses combining product sales, service revenue, SaaS, and marketplace sales need each stream analyzed separately.
Typical pattern: Different revenue streams have different taxability rules in each state. A subscription box company selling on Shopify + Amazon, with B2B wholesale + a digital app, has 4 separate compliance streams.
Watch for: Mixed businesses are where most sales tax exposure hides. Stream-by-stream analysis is essential.
This is general guidance. Specific taxability for your business depends on each state’s rules, your revenue mix, customer location, and how your products or services are structured. The nexus review produces a state-by-state taxability map for your specific situation.
The compliance cadence
Sales tax compliance runs on a four-phase monthly rhythm. Same shape every month, regardless of how many states or how complex.
Days 1–7
Prior month sales data pulled from QuickBooks, Shopify, Amazon, and other platforms. Sales by state and jurisdiction reconciled. Marketplace facilitator transactions separated from direct sales. Tax-collected vs. tax-due variances identified.
Days 7–15
Returns prepared for each state with filings due that month. Local jurisdiction breakdowns calculated. Exemption certificates verified for any non-taxed transactions. Threshold tracking updated.
Days 15–25
Returns filed on each state’s required schedule. Tax remitted via state portals or ACH. Filing confirmations stored. Any state-specific issues (rate updates, schema changes) handled.
Days 25–31
State notices reviewed and responded to within service windows. Economic nexus thresholds monitored across all states. New nexus warnings flagged. Monthly compliance summary delivered.
What compliance delivers
Every TechBrot sales tax engagement delivers these workstreams. Specialized work layers on as scope requires.
Pricing scope
Recurring compliance is priced as a fixed monthly fee against written scope. Initial nexus analysis and state registration are quoted separately. Filing software costs (Avalara, TaxJar) pass through at vendor pricing when applicable.
Tier 01
$250–$500/month
For: 1–3 state compliance, single revenue stream, no marketplace complexity, simple products or services.
Tier 02 · Most common
$500–$1,000/month
For: 4–15 state compliance, multi-channel e-commerce, marketplace + direct sales, service businesses with multi-state exposure, growing SaaS companies.
Tier 03
$1,000–$1,500+/month
For: 15+ state compliance, complex multi-stream businesses, SaaS with full taxability mapping, B2B with significant exemption certificate work, industry-specific compliance (alcohol, tobacco, regulated products).
One-time engagements (separate from monthly retainer): Initial multi-state nexus analysis $500–$2,000. State registration packages $200–$500 per state. SaaS taxability analysis $1,000–$3,000. Voluntary Disclosure Agreement coordination quoted per state based on exposure. Filing software (Avalara, TaxJar) passes through at vendor pricing — typically $50–$500/month depending on transaction volume.
Why this changed
Before 2018, sales tax obligations followed physical presence — a business owed sales tax in a state only if it had a physical location, employees, or inventory there. Out-of-state e-commerce sellers had no general obligation in states where they had no physical footprint.
In June 2018, the Supreme Court’s decision in South Dakota v. Wayfair, Inc. overturned that physical-presence standard. The ruling allowed states to impose sales tax obligations based on economic nexus — sales volume or transaction count alone — regardless of physical presence. Within months, most U.S. states adopted economic nexus rules, typically pegged to thresholds like $100,000 in sales or 200 transactions in a calendar year (specifics vary by state and have shifted over time).
The practical result: most U.S. small businesses operating across state lines now have multi-state sales tax obligations they didn’t have before 2018. E-commerce sellers, SaaS companies, and service businesses crossing state lines all moved from a simple compliance picture to a structurally more complex one. Most haven’t caught up.
This page exists because most small business owners we talk to haven’t fully reckoned with the post-Wayfair world. Quantifying exposure is the first step. Compliance going forward is the second. A nexus review usually takes 1–2 weeks and produces a state-by-state map of where you stand.
Why bookkeeping integration matters
Sales tax filings are only as accurate as the transaction data underneath them. When sales tax compliance runs separately from bookkeeping, the most common problem is the same: sales-by-state numbers in QuickBooks don’t match sales-by-state numbers in the filing system. Reconciliation gaps multiply each month. State filings end up wrong. Notices arrive. Audits find variances.
When TechBrot delivers both monthly bookkeeping and sales tax compliance, the integration is built in. Transaction-level data flows from QuickBooks into sales tax preparation. Filings reconcile to the books monthly. Year-end audit packages flow into your CPA without rework. Combined cost is materially lower than running them with separate providers — not because either is cheaper in isolation, but because the reconciliation cost disappears.
Sales tax compliance is one of the highest-stakes operational accounting workstreams for multi-state businesses. The integration matters.
Who handles your compliance
Every TechBrot sales tax compliance engagement is delivered by Certified QuickBooks ProAdvisors with multi-state sales tax experience — either directly by our lead practice or by a vetted operator running their own practice under TechBrot’s standards.
For engagements involving Voluntary Disclosure Agreements, sales tax audits with significant exposure, or tax-position disputes, we coordinate with state-specific sales tax counsel or CPAs. TechBrot’s role is operational compliance and documentation; legal representation and tax-position defense run through licensed professionals. The split is clean and stated up front.
Sales tax questions
The ongoing operational work of determining where a business owes sales tax (nexus), registering with each state, collecting tax from customers at correct rates, filing returns on each state’s schedule, remitting collected tax, managing exemption certificates, and responding to state notices and audits.
Fixed monthly fees scaling with state count: Simple (1–3 states) $250–$500/mo, Standard (4–15 states) $500–$1,000/mo, Complex (15+ states) $1,000–$1,500+/mo. Initial nexus analysis and state registration: one-time engagements typically $500–$3,000. See pricing section.
Economic nexus is the legal threshold that triggers sales tax obligations based on economic activity (revenue or transactions) rather than physical presence. Established by the 2018 South Dakota v. Wayfair Supreme Court ruling. Most states require collection and remittance once a business exceeds $100,000 in sales or 200 transactions in the state (specifics vary by state).
It depends on the state. SaaS taxability varies more than almost any other category. Some states fully tax SaaS, some fully exempt, some apply conditional rules. Multi-state SaaS companies typically need jurisdiction-by-jurisdiction taxability analysis — part of the initial nexus engagement.
Most states have marketplace facilitator laws requiring platforms (Amazon, eBay, Walmart, Etsy) to collect and remit on behalf of third-party sellers for marketplace transactions. Sellers still need to track marketplace sales, may need to register for reporting purposes, and remain responsible for direct sales outside the marketplace. Amazon FBA inventory in a state typically creates physical nexus independent of economic nexus — even if marketplace handles collection.
Multi-state filings, sales tax remittance, nexus monitoring, marketplace facilitator reconciliation, QuickBooks and platform integration (Shopify, Amazon, etc.), state notice response, exemption certificate management, rate update monitoring, monthly compliance summary, and annual nexus review. Specialized work (VDAs, audit support, back-tax analysis) layers on as scope requires.
Common situation. For limited exposure: register and start complying going forward. For larger exposure: Voluntary Disclosure Agreement (VDA) programs with each affected state typically reduce penalties and limit the lookback period in exchange for proactive registration and back-tax payment. We coordinate with state-specific sales tax counsel when VDAs or back-tax negotiation are required.
Yes, with the right caveat. We provide audit support — records, auditor request response, documentation, factual coordination. For audits with significant tax-position disputes or large dollar exposure, we coordinate with state-specific sales tax counsel or CPAs who can represent the business in front of the state. TechBrot’s role is operational support; legal representation runs through licensed professionals.
Start here
A nexus review is the right first step. We’ll map where you have exposure today, what compliance going forward looks like, and what back-tax exposure (if any) needs addressing. Quoted in writing within 5 business days. No pitch.
