Visibility in this ranking can be paid for. Payment gives a vendor more visibility, higher up on the review pages; it never adds a vendor, and it never changes a word of the review. The largest vendors in sales tax software
cannot hold places 1 to 3. Places 1 to 3 go to challengers, vendors outside the best-known brands in a category,
wherever the category has them; the established names follow from place 4 in their ranked order. How it works: placement disclosure ·
editorial process.
The 14 tools, reviewed
#1 Numeral
Sales tax and VAT filing sold per return · United States · numeral.com
Per-return pricing Free nexus study US and VAT
Numeral gets the order of operations right for a business that is not sure it owes anything. You connect a store or billing system, the free tier runs a nexus study and a historical liability audit, and only when a state needs a registration or a return do you pay.
- Pricing: Per filing. Free monitoring tier; Professional is $75 per return filed plus a $150 one-time registration fee per state; Enterprise is quoted. Free plan: free plan.
- Best for: Startups and online sellers in many states
- Strengths: Nexus monitoring; Registrations; Filing and remittance.
Where it falls short
The per-return model gets expensive when you file monthly in many states; fifteen states filed monthly is a lot of $75 units.
Wrong for
A company filing monthly in dozens of states, or one that needs a deep ERP connector and years of audit history, should price Avalara or Vertex against Numeral's per-return total.
Visit Numeral →
#2 Anrok
Sales tax automation built for SaaS companies · United States · anrok.com
SaaS focused Per-market price Global exposure
Anrok writes its pricing in the unit a SaaS finance lead already thinks in, the jurisdiction. Starter at $100 per market per month covers calculation, filing, remittance, certificates and nexus tracking together, so there is no separate bill for the return.
- Pricing: Per market / month. Starter is $100 per market per month, where a market is one US state or one country or region. Free plan: none.
- Best for: B2B SaaS companies selling in many places
- Strengths: Real-time calculation; Filing and remittance; Exemption certificate management.
Where it falls short
Markets add up: a company active in thirty states pays for thirty markets, and the page notes that high transaction volumes can add fees on Starter.
Wrong for
A merchant shipping physical products through marketplaces and carts should look at Numeral, TaxJar or Avalara, whose connectors are built around order data rather than subscription invoices.
Visit Anrok →
#3 Kintsugi
AI-assisted nexus tracking, filing and registration · United States · trykintsugi.com
Free tier AI categorization Global nexus
Kintsugi covers the whole path from watching nexus to filing the return, and the free tier already includes global nexus monitoring, product categorization, address validation and CSV imports. A business can load a year of sales, see where it crossed a threshold, and decide later whether to pay.
- Pricing: Per filing. Free at $0 for nexus monitoring and imports. Free plan: free plan.
- Best for: Growing SaaS and ecommerce brands
- Strengths: Nexus monitoring; Product categorization; Address validation.
Where it falls short
Real-time calculation integrations, API access and multi-country filing are Premium-only and quoted, so the cheap entry price covers less than it first seems.
Wrong for
A company needing a calculation engine inside an ERP at checkout should start with Avalara, Vertex or Stripe Tax.
Visit Kintsugi →
#4 Avalara
Tax calculation engine with 1,400+ integrations · United States · avalara.com
Most integrations ERP ready Multi-tax
Avalara is the product that most accounting, billing and commerce systems already know how to talk to: the AvaTax page counts more than 1,400 signed partner integrations, including Oracle, Microsoft Dynamics, Shopify, QuickBooks, Sage, SAP and Stripe. Beyond sales tax it calculates VAT, consumer use, communications, occupancy and excise tax.
- Pricing: Transaction tiers. Transaction-based annual tiers. Free plan: none.
- Best for: Mid-sized firms with ERP or marketplace stacks
- Strengths: Sales tax calculation; VAT and consumer use tax; Communications and excise tax.
Where it falls short
Pricing is built from several moving parts and the numbers on the page are starting points, not a quote.
Wrong for
A founder with ten orders a day and two states to file in would be buying more engine than needed.
Visit Avalara →
#5 Stripe Tax
Tax calculation and filing inside Stripe · United States · stripe.com
Stripe native 600+ categories Registration help
For a company that already runs Checkout, Billing or Invoicing on Stripe, tax calculation is a switch rather than a project. The product monitors thresholds, calculates tax on 600+ product categories in 100+ countries, validates EU and Australian VAT numbers, and in Tax Complete can register you in 90+ countries.
- Pricing: Per transaction or subscription. Tax Basic is pay-as-you-go; the Dutch page lists 0.5% per transaction no-code or EUR 0.45 per API transaction. Free plan: none.
- Best for: Businesses already billing on Stripe
- Strengths: Threshold monitoring; Real-time calculation; VAT number validation.
Where it falls short
Value depends on keeping Stripe as your payment path; it can calculate through the API for other processors, but the best experience is native.
Wrong for
A business that runs payments through several processors, or that wants a human tax team to review exposure, should compare Numeral, Kintsugi or Sovos.
Visit Stripe Tax →
#6 TaxJar
Sales tax reporting and AutoFile for online sellers · United States · taxjar.com
Published price AutoFile Stripe owned
TaxJar pairs a reasonable monthly fee with filing credits, so a small seller can look up a state's liability, review the report and let the platform file it. The two plans are published: $39 a month for Starter, $99 for Professional with more integrations, phone support and a customer success manager.
- Pricing: Flat monthly. Starter is $39 per month and Professional is $99 per month. Free plan: free trial.
- Best for: Small ecommerce sellers filing in the US
- Strengths: Sales tax calculation; Multi-state reporting; AutoFile filing.
Where it falls short
The plans cap order volume and include only a few AutoFile credits per year, so a company filing monthly in many states will pay extra per return.
Wrong for
A company with an ERP needing in-transaction rates across many entities should look at Avalara or Vertex; international sellers should add a VAT specialist.
Visit TaxJar →
#7 Zamp
Sales tax automation with a free sandbox · United States · zamp.com
Free plan API sandbox Quote pricing
Zamp lets a buyer test before talking to sales: the free plan includes a nexus assessment, a product taxability review and a 30-minute consultation, plus rate-limited API sandbox access for 30 days to try rates and edge cases.
- Pricing: Quote only. Free plan covers nexus assessment, taxability review and API sandbox; US and US plus Canada plans are priced by quote. Free plan: free plan.
- Best for: Online sellers wanting a quote and a human
- Strengths: Nexus assessment; Taxability review; Rooftop-accurate calculation.
Where it falls short
No public price list exists, so a buyer cannot compare Zamp against Numeral or Kintsugi without a sales call. The free sandbox expires after 30 days.
Wrong for
Teams that need a published price to put in a budget memo should start with Numeral, Anrok or TaxJar.
Visit Zamp →
#8 Quaderno
Tax calculation, invoicing and reporting for digital sellers · Spain · quaderno.io
VAT and sales tax Invoicing Visma owned
Quaderno is a good fit for a seller who has to invoice and tax cross-border sales without hiring a specialist. Prices are public and tiered by monthly transactions, counting any sale, refund or purchase recorded: $24 for Hobby, $41 Startup, $83 Business and $124 Growth.
- Pricing: Per transactions / month. Five monthly plans: Hobby $24, Startup $41, Business $83, Growth $124 and Enterprise by quote. Free plan: free trial.
- Best for: Small digital sellers with EU and US customers
- Strengths: Tax calculation; Invoicing; Tax reporting.
Where it falls short
The pricing page does not describe return filing; Quaderno calculates and reports, and you or a partner still file. The company belongs to Visma, whose priorities may differ from a standalone vendor.
Wrong for
A company that wants the vendor to file and guarantee the returns should compare Numeral, Kintsugi or Taxually; ERP-centric firms should compare Avalara.
Visit Quaderno →
#9 Taxually
VAT, GST and sales tax compliance service · Hungary · taxually.com
VAT focus 150+ countries Done-for-you
Taxually serves sellers who already know that VAT is the harder problem. Its CrossTax product handles VAT for international sellers, LumaTax handles US sales tax, and the site lists e-invoicing in 32 countries, EPR and consolidated VAT payments.
- Pricing: Quote only. Pricing is not published on the site, and no free trial was mentioned on the pages checked. Free plan: none.
- Best for: International ecommerce sellers needing VAT filings
- Strengths: VAT registration; Cross-border VAT filing; US sales tax (LumaTax).
Where it falls short
No prices are published, so you cannot work out cost per country before a call. The marketing pages describe speed and savings in the vendor's own terms and give no verifiable headquarters.
Wrong for
A US-only SaaS company wanting self-serve filing should look at Anrok, Numeral or TaxJar; large enterprises should compare Sovos or Vertex.
Visit Taxually →
#10 Paddle
Merchant of record for software sellers · United Kingdom · paddle.com
Merchant of record All-in-one Fixed percent
Paddle is different in kind from the rest of this list. Paddle is the seller of record, so it collects the right tax, tracks deadlines, prepares records and submits returns under its own registrations.
- Pricing: Percent per transaction. 5% + 50 cents per checkout transaction with no monthly fee; custom pricing for high volume. Free plan: none.
- Best for: Software sellers wanting tax off their books
- Strengths: Merchant of record; Tax collection; Return filing.
Where it falls short
Paddle owns the customer transaction: payouts, refunds, invoices and the checkout are all Paddle's, so you give up control of the billing relationship.
Wrong for
Companies selling hardware or services, or taking payments through their own stack, should choose a tax tool instead of a merchant of record.
Visit Paddle →
#11 Fonoa
Tax engine, validation and e-invoicing API · Ireland · fonoa.com
API first Tax ID validation E-invoicing
Fonoa sells modules rather than an application: Validate checks tax IDs in 120+ countries, Tax Engine calculates VAT, GST and sales tax in 100+ jurisdictions, E-Invoicing connects to governments in 150+ countries, and Returns files multi-country returns.
- Pricing: Quote only. Pricing is not published; the site offers demos rather than plans. Free plan: none.
- Best for: Platforms and marketplaces selling globally
- Strengths: Tax ID validation (120+ countries); Tax engine (100+ jurisdictions); E-invoicing.
Where it falls short
Pricing is invisible and the product assumes engineering time to integrate. Stated metrics such as retention and ratings come from the vendor's page and can't be checked here.
Wrong for
A seller with a small store and US states to file in should use a filing-focused tool such as Numeral, TaxJar or Kintsugi.
Visit Fonoa →
#12 Sovos
Indirect tax, e-invoicing and reporting platform · United States · sovos.com
Enterprise E-invoicing Reporting
Sovos's range is the reason to consider it. The site describes an agentic tax compliance platform covering determination, filing, e-invoicing, information reporting such as 1099 and ACA, crypto tax, unclaimed property and compliant shipping for wine and spirits, with coverage of about 200 countries and 100K+ companies.
- Pricing: Quote only. No prices are published; the site directs visitors to book a call or chat with a specialist. Free plan: none.
- Best for: Large companies with multi-country compliance
- Strengths: Tax determination; Filing and reporting; E-invoicing.
Where it falls short
Nothing about price or onboarding time is public, and the site gives no headquarters address on the pages checked.
Wrong for
A small seller or startup should skip the enterprise sales cycle and begin with Numeral, TaxJar or Kintsugi.
Visit Sovos →
#13 Vertex
Enterprise tax determination and compliance platform · United States · vertexinc.com
Enterprise ERP depth Quote only
Vertex builds for companies where tax is a department. The site lists tax determination, e-invoicing, returns, audit readiness and a copilot feature, with support for 195 countries, 20,000+ jurisdictions, 4,500+ companies and 60% of the Fortune 500. Industry modules include retail, hospitality, communications and oil and gas.
- Pricing: Quote only. No pricing is disclosed on the site; sales are consultative. Free plan: none.
- Best for: Large enterprises with complex ERP landscapes
- Strengths: Tax determination; E-invoicing; Returns and reporting.
Where it falls short
Prices are not published, and the website still refers to legacy on-premises O-Series products alongside Vertex Cloud, which makes version questions worth asking.
Wrong for
Any company with a handful of states to file in, or without a tax team, is better served by Numeral, TaxJar or Avalara.
Visit Vertex →
#14 Thomson Reuters ONESOURCE
Enterprise indirect tax determination and compliance · Canada · tax.thomsonreuters.com
Enterprise 195+ countries Tax department
ONESOURCE targets the corporate tax function, not the founder. The indirect tax pages describe Indirect Compliance, which centralizes VAT, GST and sales tax compliance, and Determination, a certified engine for global indirect taxes, with support for 195+ countries and territories.
- Pricing: Quote only. No pricing on the site; the page directs buyers to contact Thomson Reuters. Free plan: none.
- Best for: Multinationals running global indirect tax
- Strengths: ONESOURCE Determination; Indirect Compliance; VAT, GST and sales tax.
Where it falls short
No prices or plan structure are public, and the page does not describe deployment or setup time.
Wrong for
Companies without a tax department, or with mostly US state returns, should start with filing-centered tools like Numeral, Kintsugi or TaxJar.
Visit Thomson Reuters ONESOURCE →
Questions and answers
What is the best sales tax software in 2026?
Numeral ranks first of 14, best for startups and online sellers in many states. Anrok is second (b2B SaaS companies selling in many places) and Kintsugi third (growing SaaS and ecommerce brands). Places 1 to 3 go to challengers, vendors outside the best-known brands, wherever the category has them.
What is sales tax nexus and how do I know if I have it?
Nexus is a connection to a state that creates a duty to collect its sales tax. Physical presence, such as an office, employee or inventory, creates it, and so does economic activity above a state's sales or transaction threshold.
Do I need sales tax software if I only sell on Amazon or Etsy?
Less than a direct seller does, but not zero. Marketplace facilitator rules in the US generally make the marketplace collect and remit on your behalf for sales through it.
How much does sales tax software cost?
It depends on the pricing unit.
What is the difference between tax calculation and tax filing?
Calculation decides how much tax to add to an order, using the customer's address and the product's taxability. Filing is the later work of registering with the state, preparing the return, submitting it and paying the money.
Is a merchant of record a replacement for sales tax software?
For the sales it handles, yes. With Paddle as merchant of record, Paddle is the seller, collects the tax and files under its own registrations, for 5% + 50 cents per checkout.
Can sales tax software handle EU VAT as well?
Some can. Taxually, Quaderno, Fonoa, Numeral, Sovos and Stripe Tax all cover VAT in some form, with Numeral citing 90+ countries and Stripe Tax citing registration help in 90 countries.
What happens if I have been collecting no sales tax for years?
You may owe back tax, interest and penalties for periods since you crossed a threshold. Many states offer voluntary disclosure programs that limit lookback and penalties if you come forward before they contact you.
Should a small business pay for Avalara or Vertex?
Usually not at the start. Avalara earns its place when your ERP, billing system or cart needs an engine with a ready connector, since it counts more than 1,400 integrations.
How do I get my filing history out if I change vendors?
Ask for the filed returns with confirmations, the transaction-level tax detail, the exemption certificates as files, and the state portal credentials or a power-of-attorney change before you give notice.
Do exemption certificates need software?
If you sell to resellers, nonprofits or other exempt buyers, yes. A state auditor can ask for the certificate behind every untaxed sale, and expired or missing certificates turn those sales into taxable ones.
