Modeled year-one cost by number of filing states
Each cell is a full year of list price for a seller filing monthly in that many states. “Quoted” means the vendor publishes no price for that scenario — not that it is free or unavailable.
| Vendor | Plan | 1 state | 3 states | 5 states | 10 states | 25 states | How it scales |
|---|---|---|---|---|---|---|---|
| Prophit.ai | Starter | $2,388 | $2,388 | $2,388 | $2,388 | $2,388 | Flat — does not change with states |
| Prophit.ai | Professional | $7,188 | $7,188 | $7,188 | $7,188 | $7,188 | Flat — does not change with states |
| Avalara | AvaTax entry tier | $699 | $2,097 | $3,495 | $6,990 | $17,475 | Entry tier is per state, per year |
| TaxJar | Starter | $968 | $2,168 | $3,368 | $6,368 | $15,368 | Subscription + $50 per filing beyond 2/year |
| TaxJar | Professional | $1,628 | $2,948 | $4,268 | $7,568 | $17,468 | Subscription + $55 per filing beyond 4/year |
| Anrok | Starter (eCommerce) | $600 | $1,800 | $3,000 | $6,000 | $15,000 | $50 per state, per month |
| Vertex | O Series | Quoted | Quoted | Quoted | Quoted | Quoted | No published price — quote only |
What the published prices show
- Pricing model matters more than headline price. A seller filing in 10 states pays $2,388 on a flat plan, $6,990 on a per-state entry tier, $6,000 on per-market pricing, and $6,368 once per-filing credits are added — from list prices alone.
- Per-state and per-filing pricing crosses the flat plan quickly: at 5 states the published per-state entry tier already exceeds a full year of the flat $199/month plan.
- Only 5 of the 6 vendor plans surveyed publish enough to compute a year-one cost at all. Vertex publishes no price; Avalara, Anrok, and TaxJar publish an entry tier and quote everything above it.
- Filing volume, not transaction volume, is what compounds on the per-filing model: monthly filing in 10 states is 120 filings a year, and only 2 to 4 of them are included.
- Flat pricing is not automatically cheaper: at one filing state the published per-state entry tier ($699) and per-market pricing ($600) both come in under the flat plan. The models cross as states are added.
- Every number here is a published list price, not a negotiated quote. Real quotes commonly differ — which is the point: list prices are the only thing a buyer can compare before talking to sales.
Every input, as published
Read from each vendor's own pricing page on 2026-08-23. Follow the links to confirm before relying on any figure.
| Vendor | Plan | Pricing basis | Published price | Source |
|---|---|---|---|---|
| Prophit.ai | Starter / Professional | Flat per organization | Starter $199/month · Professional $599/month · Enterprise contract-defined | Pricing page |
| Avalara | AvaTax | Per state, per year (entry tier), usage-based above it | “Plans start at $699 per state, per year.” | Pricing page |
| TaxJar | Starter | Subscription + per-filing credits | $39/month at 200 orders · 2 AutoFile credits/year included · $50 per additional filing | Pricing page |
| TaxJar | Professional | Subscription + per-filing credits | $99/month at 200 orders · 4 AutoFile credits/year included · $55 per additional filing | Pricing page |
| Anrok | Starter (eCommerce) | Per market, per month — “each US state = one market” | $50 per market/month (eCommerce) · $100 per market/month (all other companies) | Pricing page |
| Vertex | O Series | Quote only — no published list price | Not published | Pricing page |
Methodology and limits
The model assumes one return per state per month (the most common assigned cadence), twelve months of subscription, and the vendor's published entry tier. It adds per-filing charges only where the vendor publishes them, and it never estimates a price a vendor has not published.
- Excluded: registration fees, implementation and onboarding, annual-payment discounts, negotiated discounts, overage above published order tiers, and any add-on module priced separately.
- Volume: TaxJar's published tiers are quoted at 200 orders/month; higher volumes are quoted, so this model does not extend them.
- Filing cadence: states assign frequency per account. Quarterly or annual filers on per-filing pricing pay materially less than this monthly model.
- Prophit.ai: figures come from the same canonical pricing model that drives /pricing, so this study cannot drift from the published plans.
- Not a quality ranking: price is one input. Coverage, integrations, filing services, and support differ substantially between these products.
Cite this data
Free to cite, quote, or embed with attribution: “Prophit.ai 2026 Sales Tax Software Pricing Index, https://prophit.ai/resources/sales-tax-software-pricing-index-2026”. Corrections welcome — if a published price changed, tell us and we will re-verify and re-date the table.
Related: the sales tax software comparison, the 2026 local rate study, and the 2026 filing calendar.
Competitor prices are list prices published by each vendor on 2026-08-23 and can change at any time; confirm current pricing with the vendor. This study is not affiliated with or endorsed by the vendors named.