Sales Tax Questions
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What does sales tax compliance actually cost a $5M–$20M ecommerce brand?

⚡ TL;DR

A $5M–$20M ecommerce brand typically spends $19,000–$80,000 per year all-in on compliance (software, filing fees, and internal staff time). Non-compliance costs far more: back taxes over a 3–5 year lookback, penalties of 10–25%, interest compounding at 3–12% annually, and $5,000–$30,000 in audit representation fees.

The real cost of compliance is usually lower than brands assume. The cost of non-compliance is almost always higher than they realize.

Typical cost components

Sales tax calculation software:

  • Entry-level (TaxCloud, basic TaxJar plans): $1,000–$5,000/year
  • Mid-market (Avalara AvaTax, TaxCloud Pro, TaxJar Business): $3,000–$15,000/year depending on transaction volume and state count
  • Enterprise (Avalara Enterprise, Vertex): $20,000–$100,000+/year

AutoFile / return filing services:

  • Per-state per-period fee: $15–$60/state/period
  • For a brand filing in 25 states monthly: $4,500–$18,000/year in filing fees
  • Some platforms include AutoFile in their subscription; others charge per return

Registration costs:

  • Initial registration per state: $0–$100 (most states are free; a few charge fees)
  • One-time cost for initial nexus expansion; amortized over the life of the compliance relationship

Internal staff time:

  • Bookkeeper or controller reviewing returns, handling exemption certificates, managing notices: 10–40 hours/month
  • At a $60–$100/hour loaded cost, this is $7,200–$48,000/year
  • Higher for brands with significant B2B sales requiring active certificate management

Accounting/advisory fees:

  • CPA review of returns and nexus analysis: $2,000–$10,000/year for ongoing advisory
  • More if the brand has complex situations (M&A, multi-entity, international)

Typical all-in cost by brand size

RevenueStates filingSoftwareFiling feesInternal timeEstimated total
$2M–$5M5–15 states$2,000–$5,000$1,500–$5,000$5,000–$15,000$8,500–$25,000
$5M–$10M15–25 states$5,000–$12,000$4,000–$12,000$10,000–$25,000$19,000–$49,000
$10M–$20M25–40 states$8,000–$20,000$8,000–$20,000$15,000–$40,000$31,000–$80,000

What non-compliance costs

For reference, what non-compliance can cost when discovered through audit:

  • Back taxes for 3-5 years: depends on revenue, but often $20,000–$200,000+ for a meaningful seller
  • Penalties: 10–25% of back taxes
  • Interest: 3–12% annually, compounded, for the full lookback period
  • Legal/advisory fees for audit representation: $5,000–$30,000+

The math almost always favors compliance over hoping not to be found.

Frequently asked questions

How much does sales tax compliance cost for a mid-size ecommerce brand?
For a brand doing $5M–$20M in revenue with nexus in 15–30 states, expect $8,000–$30,000 per year in software and filing fees (calculation engine + AutoFile for 20-30 states), plus 20-40 hours per month of internal staff time for returns review, exception handling, and certificate management. Total all-in cost (software + staff time at loaded cost) typically runs $25,000–$60,000 per year.
Is sales tax compliance cost a fixed expense or does it scale with revenue?
Both. Some costs are fixed (software subscription, base filing fees). Others scale with transaction volume (calculation API calls priced per transaction) and with nexus expansion (adding new states requires new registrations and filings). As a percentage of revenue, compliance costs tend to decrease as a brand scales: a $20M brand often spends a similar absolute dollar amount as a $5M brand but at a lower percentage of revenue.

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