You crossed $100,000 in sales into a state you have never visited, and that was enough. Since the Supreme Court's Wayfair decision, most states treat $100,000 in sales or 200 transactions as economic nexus — a registration, collection, and filing obligation that attaches whether or not you have a warehouse, employee, or storefront there. Miss it and the bill arrives years later as back taxes plus penalties and interest, on revenue you already spent. The software below exists so that never happens, but the four leading options charge anywhere from $39 a month to five figures a year, and the cheapest one for a startup can be the most expensive one for a company doing $2 million. This guide compares Avalara, TaxJar, Stripe Tax, and Anrok on the five dimensions that decide the bill: pricing model, calculation coverage, filing and remittance, exemption certificates, and integrations.
Prices below are published list prices checked in 2026. This category reprices often — one tool on this list more than doubled its entry plan in February 2026 — so confirm every number against the vendor's own pricing page before you sign.
The Short Answer
- Pick Avalara if you run an ERP and sell business-to-business. Its CertCapture exemption-certificate management is best in class, and its connectors into NetSuite, Microsoft Dynamics, and Sage Intacct put tax logic inside the system your orders already flow through. Expect custom-quoted pricing that starts in the low thousands per year and climbs with volume.
- Pick TaxJar if you are a US-only online seller who wants self-serve simplicity. Starter runs $39 a month for up to 200 orders, with automated filing at $50 per return. Know what you are buying into: Stripe owns it, new-account international coverage ended in 2025, and every stale comparison still quoting $19 a month is two price changes out of date.
- Pick Stripe Tax if Stripe already processes your payments. Setup is close to zero because there is nothing to integrate. At 0.5% of every transaction, it is cheap while you are small and punishing once you are not — the crossover against flat-rate tools sits near $30,000 a month in taxable volume.
- Pick Anrok if you sell software or subscriptions and your hardest question is what is taxable where. At $100 per market per month with filing and remittance included, it is the only option here that bundles everything into one predictable number, and its taxability research for SaaS is the reason to pay it.
How to Compare Sales Tax Software: Five Dimensions
Every vendor demo leads with the same screen — a correct rate applied at checkout — because calculation is the one capability all four share. The money and the risk live in the other four columns.
1. Pricing model. Subscriptions charge by orders or markets, per-transaction tools charge a cut of volume, and Avalara quotes by deal. A percentage fee and a flat fee cross over at a specific revenue line; know yours before you pick.
2. Calculation coverage. US-only versus global, physical goods versus digital versus SaaS, and — the question demos skip — who decides your product's taxability category in each state. A correct rate on a wrong category is a wrong return.
3. Filing and remittance. Calculating the right tax and filing the return that pays it are separate jobs, often separate invoices. Count your annual returns first: a monthly filer in three states files 36 returns a year, and per-return fees multiply fast.
4. Exemption certificates. If you sell wholesale or B2B, you must collect, validate, and renew resale and exemption certificates, or every exempt sale becomes taxable in an audit. If you sell only to end consumers, this column is irrelevant.
5. Integrations and ERP depth. A Shopify or Stripe plugin covers a single channel. An ERP connector covers every channel at once. Sellers with one storefront and sellers with three channels plus wholesale need different tools.
Avalara: Best for Enterprises With an ERP
Avalara is the reference implementation of this category — the broadest jurisdiction coverage, the deepest ERP connectors, and the price tag to match.
Pricing. Avalara publishes three fixed anchors and quotes everything else: license guidance starting near $119, sales tax registration at $403 per location, and bundled calculation-and-returns packages starting near $699. AvaTax itself is quoted per deal based on transaction volume, jurisdiction count, and connected applications. In practice, mid-market deployments run roughly $4,000 to $20,000 a year, and full enterprise setups with calculation, returns, exemption management, and managed filing reach $50,000 and up. Implementation and premium support sit outside the license fee, so budget for both.
Filing. Avalara's Managed Returns service prepares, files, and remits, including notice management when a state sends questions. As a Certified Service Provider in Streamlined Sales Tax states, Avalara files those states at no added cost to you — the participating states cover it.
Exemption certificates. CertCapture collects, validates, tracks expiry on, and renews exemption certificates. It is genuinely the best tool here for that job, and for a wholesaler it can justify the platform on its own.
Integrations. Deep connectors into NetSuite, Microsoft Dynamics, Sage Intacct, Shopify, BigCommerce, and QuickBooks, plus certified partner builds for most mid-market ERPs. A detail worth knowing: Xero's US automatic sales tax runs on Avalara underneath, so plenty of small sellers are already Avalara customers without having chosen it.
Where Avalara falls short. The price is not knowable in advance, which makes budgeting hard for a company without a procurement function. There is no invoicing module. And the feature set that justifies the cost — certificate management and ERP-grade connectors above all — is not the feature set a seller registered in five states actually needs. If that is you, you are paying enterprise rent for a starter apartment.
TaxJar: Best for Existing Customers, a Harder Sell for New Ones
TaxJar built its reputation as the friendly self-serve option for US online sellers. The product still works well; its strategic position changed more than its features.
Pricing. Starter starts at $39 a month for up to 200 orders; Professional starts at $99 a month. That Starter price more than doubled from $19 in February 2026 — the product's first price change in over six years — and automated filing fees rose at the same time, from $30 to $35 per return to $50 on Starter and $55 on Professional. There is a 30-day free trial and no free plan.
Filing. AutoFile prepares and files your returns, but each plan includes only a small number of credits, and every return beyond them bills per filing. Run the annual math: a monthly filer in three states files 36 returns a year, and at $50 each beyond the included credits, filing alone can exceed $1,700 a year on top of a $468 subscription. TaxJar does not participate in the Streamlined Sales Tax program, so there is no free-filing offset in SST states.
Exemption certificates. TaxJar's certificate handling is basic compared with Avalara or Anrok. B2B sellers with meaningful wholesale volume should treat this as a gap, not a checkbox.
Integrations. Strong coverage of ecommerce platforms — Shopify, BigCommerce, WooCommerce, Amazon, eBay — and accounting tools including QuickBooks and Xero, plus an API. ERP depth is shallower than Avalara's.
Where TaxJar falls short. Stripe acquired TaxJar in 2021, and since then new signups have been steered toward Stripe Tax; TaxJar stopped offering international VAT and GST calculation to new accounts in September 2025, making it a US-only product for anyone choosing today. Per-filing economics punish multi-state sellers. The deeper issue is roadmap: TaxJar's owner sells a competing product and points new customers at it. If you are already on TaxJar and happy, there is no emergency. If you are choosing fresh, price the alternatives before you commit.
Stripe Tax: Best if You Are Already on Stripe
Stripe Tax has the shortest setup of anything here, because if Stripe is already your processor there is nothing to integrate. You switch it on, register where it tells you to, and it calculates and collects on every Stripe transaction.
Pricing. Stripe Tax Basic charges 0.5% per transaction through no-code integrations, or 50 cents per transaction through the API, in jurisdictions where you are registered. Stripe also sells Tax Complete bundles starting at $90 a month, which include a block of transactions plus registration and filing support delivered through partners. The arithmetic matters because percentage pricing inverts the usual software curve: it is cheap while you are small and punishing once you are not. At $30,000 a month in taxable Stripe volume, the 0.5% fee is $150 a month — already past several flat-rate alternatives — and the gap widens with every dollar of growth.
Filing. Basic Stripe Tax calculates and collects; registration, filing, and remittance remain yours unless you step up to Tax Complete, where filing is delivered through partners rather than by Stripe itself. Confirm exactly which states and cadences the bundle covers before counting it as done.
Exemption certificates. Limited. Stripe Tax is built for taxable consumer and SaaS sales through Stripe checkout, not for wholesale flows with resale certificates. B2B sellers should look elsewhere.
Integrations. This is the whole pitch and the whole limitation: Stripe Tax sees Stripe. It is built into Billing, Invoicing, Checkout, and Payments, and its nexus monitoring watches your Stripe volume. Sell through Stripe plus Amazon plus a wholesale channel, and it has a partial view of your liability — and a partial view is what produces a surprise assessment.
Where Stripe Tax falls short. Single-channel visibility, partner-delivered filing, no serious certificate story, and a pricing model that charges you more precisely as you grow. For a Stripe-native startup under the crossover line, none of that matters. Past it, every flat-rate tool on this list deserves a quote.
Anrok: Best for SaaS Taxability Questions
Anrok was built for software companies, and it shows in the one place the others are weakest: determining whether your product is taxable in each jurisdiction in the first place. SaaS taxability varies wildly by state — tax the subscription in Texas, exempt it in California, split the difference on implementation fees — and Anrok's tax team researches your specific categorization rather than leaving the mapping to you.
Pricing. Anrok's Starter plan runs $100 per active market per month, where a market is one jurisdiction with an obligation — a US state, a country, with EU OSS counting as a single market. Exposure monitoring, real-time calculation, filing, remittance, exemption certificate management, and physical nexus tracking are all included, and there are no per-filing fees. Larger deployments move to custom-quoted plans. The per-market model makes cost modeling easy: adding your sixth state adds exactly $100 a month.
Filing. Included in the subscription — preparation, filing, and remittance with no per-return meter running. For a SaaS company filing monthly in a dozen states, the absence of per-filing fees is the headline feature.
Exemption certificates. Full management is included in the plan: collection, validation, and renewal. SaaS sellers with enterprise contracts requiring exemption documentation get this without a second vendor.
Integrations. Native connections to Stripe, Chargebee, NetSuite, QuickBooks, and the subscription billing stack, plus an API. Physical-goods support has been expanding but remains younger than the SaaS core — ecommerce sellers should verify their exact needs rather than assume parity.
Where Anrok falls short. The per-market price is honest but steep for sellers with many low-volume registrations: ten states at $100 each is $1,000 a month before you sell a dollar there. Companies under roughly five markets often find a per-filing tool cheaper. And while Anrok handles VAT and GST registration and filing in many countries, its deepest expertise remains US SaaS sales tax.
Head-to-Head Cost Math at Three Sizes
List prices mislead because every vendor meters something different — orders, transactions, markets, returns. Three worked scenarios, using 2026 published prices and typical filing mixes:
Scenario A: side business, $25,000 a month, 300 orders, filing quarterly in 4 states (16 returns a year).
| Tool | Annual math | Approx. total |
|---|---|---|
| TaxJar Starter | $39 × 12 + 16 × $50 | $1,270 |
| Stripe Tax Basic | 0.5% × $300,000 (calc only) | $1,500 |
| Anrok Starter | 4 × $100 × 12 (all-in) | $4,800 |
| Avalara | Bundled floor and up | $1,500+ quoted |
TaxJar wins on price here, with the warning that its per-return meter starts running the moment a state moves you to monthly filing.
Scenario B: growing store, $150,000 a month, filing across 12 states, about 60 returns a year.
| Tool | Annual math | Approx. total |
|---|---|---|
| TaxJar Professional | $99 × 12 + 60 × $55 | $4,490 |
| Stripe Tax Basic | 0.5% × $1,800,000 (calc only) | $9,000 |
| Anrok Starter | 12 × $100 × 12 (all-in) | $14,400 |
| Avalara | Quoted; mid-market band | $4,000–$20,000 |
This is the band where TaxJar's per-filing fees and Stripe's percentage both bite, and where Avalara's quote and Anrok's flat per-market price start looking reasonable against the metered alternatives.
Scenario C: SaaS company, $400,000 a month through Stripe, monthly filing in 10 states.
Stripe Tax Basic costs 0.5% of $4.8 million — $24,000 a year for calculation alone, before filing. Anrok costs 10 × $100 × 12 — $12,000 all-in with filing, remittance, and certificates. The percentage tool costs double the flat tool while doing less. This is the crossover the vendors' own pricing pages imply but never state: past roughly $30,000 a month in taxable volume, flat-rate tools beat Stripe Tax, and the gap grows with revenue.
Two costs never appear in these tables. Registration runs about $403 per state through most vendors' services, and several states let you register free directly — check before paying a vendor to do it. And implementation ranges from an afternoon (Stripe Tax, TaxJar) to a multi-week project with professional-services fees (Avalara on an ERP). Price the onboarding, not just the subscription.
What the Demos Skip: Nexus, Categories, and Audits
Nexus monitoring watches only what the tool can see. Every vendor advertises threshold tracking, but a tool plugged into one channel tracks one channel. If Amazon withheld and remitted marketplace facilitator tax on your behalf — as it does in nearly every state now — while your Shopify store tripped economic nexus silently, only a tool (or accountant) looking at combined sales catches it. Ask each vendor, in writing, which of your channels its monitoring covers.
Product taxability mapping is your liability, not theirs. Avalara and Anrok both research categories for you, but the degree differs enormously: Anrok assigns SaaS taxability research as a core deliverable, while self-serve tools expect you to pick the right product code from a long list. Miscategorize exempt SaaS as taxable and you over-collect for years; miscategorize taxable goods as exempt and you owe the difference plus penalties. This is the step most likely to be wrong in a small company's setup.
Audit support varies from real to decorative. Avalara's SST-state calculation liability backing and managed-notice handling are substantive. Most other plans' "audit support" means exportable reports and, at higher tiers, a few hours of a specialist's time. If audit defense matters to you — wholesale, high-ticket goods, multi-state footprints — get the scope of support in the contract, not the datasheet.
Booking It: Sales Tax Is a Liability, Not Revenue
Whichever tool you pick, the bookkeeping rule is the same: tax you collect from customers is never your money. It sits on your balance sheet as a liability from the moment of sale until the remittance clears. Booking it as revenue overstates income, and netting filing fees against it hides your true compliance cost. A clean structure separates all three:
2026-10-31 * "October online sales"
Assets:Checking 10,850.00 USD
Income:Sales -10,000.00 USD
Liabilities:Sales-Tax-Payable -850.00 USD
2026-11-20 * "October sales tax remitted to state"
Liabilities:Sales-Tax-Payable 850.00 USD
Assets:Checking -850.00 USD
2026-11-01 * "Sales tax software subscription"
Expenses:Professional-Services:Tax-Filing 39.00 USD
Assets:Checking -39.00 USDReconcile the liability account against each filed return the way you reconcile a bank account: the balance after remittance should be the next period's accruals only. A liability balance that grows quarter after quarter means collected tax is not being remitted — the exact problem this software exists to prevent.
The Decision Checklist
Work through these five questions in order, and the field usually narrows to one:
- How many jurisdictions will you file in a year from now, not today? Nexus expands with revenue. A tool priced per market punishes footprint growth; a tool priced per return punishes filing-frequency growth. Model both.
- Do you sell B2B or wholesale? If yes, exemption-certificate management is mandatory, which points at Avalara or Anrok. If no, ignore that entire column.
- Does your tax logic need to live in an ERP? Multi-channel sellers with NetSuite or Dynamics should price Avalara first. Single-channel sellers should not pay for ERP depth they will never use.
- Is your product's taxability obvious? Physical goods in a few states: any tool works. SaaS, digital goods, or bundled services across many states: Anrok's taxability research earns its fee.
- Where are you relative to the $30,000-a-month crossover? Below it, Stripe Tax's percentage is genuinely cheap if you are already on Stripe. Above it, get flat-rate quotes before renewing anything.
Start with a nexus review — which states you already owe, based on trailing-twelve-month sales by state — because the answer sets your market count, your return count, and therefore your real price under every model here. Then trial the shortlisted tool on one channel for one quarter, reconcile its liability report against your books, and only then roll it across every channel. The wrong sales tax tool still beats no tool, but the right one costs less every year you grow.
