9 Best Sales Tax Software of 2026

Avalara is the long-standing name in U.S. sales tax, and its Avalara Select plans now put a public price on it. Core Compliance costs $79 per state per month, or $799 per state per year, with a 3-state minimum. Core Compliance plus SST Services costs $69 per state per month and has no state minimum. Both include AvaTax calculation, which Avalara describes as rooftop-accurate across 12,000+ U.S. jurisdictions, plus nexus tracking, unlimited returns with no per-return fees, notice management and exemption management. The SST plan enrolls qualifying remote sellers in the Streamlined Sales Tax program, where 24 member and associate states plus Pennsylvania fund calculation and filing, so those states can cost $0. Select is meant for companies under $50M in revenue on a supported integration; larger or multi-entity businesses move to a Custom plan with global VAT, cross-border duties and a 1-hour support SLA. The main trade-off is that a seller filing in many non-SST states pays for each one.

Kintsugi splits sales tax into a free monitoring layer and paid compliance work. The Free plan watches physical and economic nexus across the US and 100+ countries, sends alerts when you cross a threshold, audits historical liability and categorizes products with AI, with no credit card. Starter charges $75 per action in the US and Canada, which covers registrations, filings, amended returns, deregistrations and back filings for past periods, plus autoregister, filing autopilot where supported and a virtual mailbox for notices. Scale moves to one flat monthly bill and adds VAT and GST in the EU, UK and 100+ countries, real-time calculation on QuickBooks, NetSuite and Dynamics 365 invoices, and notice handling. Premium adds VDAs, advanced exemption certificates, an API and SDK, and single sign-on. Kintsugi says it serves 7,000+ businesses. The per-action model is cheap for a company filing in a few states, but monthly filers in many states should compare it with Scale.

Numeral is built around handing off the filing work. The free Monitoring plan connects your stores or billing tools, runs a nexus study, watches physical and economic nexus and alerts you when you cross into a new jurisdiction. Professional charges $75 per return filed and a one-time $150 per state registration, and adds registrations, filings and remittance, Autofile, Autoregister, a virtual mailbox for tax mail, AI product classification, exemption certificate management and a concierge team. Numeral states there are no setup fees and no per-transaction overages on standard US filings, and accounts run month to month. Its guarantee says that if a return is not filed on time, Numeral pays the penalties and interest. Enterprise adds coverage in 90+ countries, the tax engine and API with 140ms p95 latency, and access to tax lawyers. The cost is easy to predict, though a seller filing monthly in ten states would pay $750 a month in filing fees.

Stripe Tax adds tax calculation to the payments and billing stack many SaaS companies already use. Tax Basic charges 0.5% per transaction where you are registered to collect, with no recurring fee, when you use the no-code integration on Billing, Checkout, Invoicing and Payment Links; transactions created through Stripe's payment APIs or another processor are priced per transaction instead. It calculates tax on 700+ product and service types, collects in 100+ countries and sends alerts when you reach a sales tax, VAT or GST threshold. Tax Complete is a monthly subscription that adds registrations in 90+ countries and filings in 90+ countries, with filing through Stripe in the US, Canada's federal simplified regime and the EU non-Union OSS, and partner filing elsewhere. Stripe's page showed Tax Complete pricing only in local currency from our location, so check the US price yourself. Teams that sell outside Stripe will need a separate tool or connector.

TaxJar prices its sales tax platform by order volume, which suits online sellers whose order counts are easy to forecast. Starter costs $39 a month for 200 orders and targets new businesses and marketplace sellers that need reporting and filing; it includes up to 3 data import integrations, email support and 2 AutoFile credits a year, with extra credits at $50. Professional starts at $99 a month for 200 orders and adds up to 10 integrations, API access with 10,000 calls a minute, a developer sandbox, phone support, onboarding help and 4 AutoFile credits. The plan comparison lists a product tax code catalog, AI taxability recommendations, exemption certificate storage, jurisdiction-level reports and economic nexus alerts. Flex fees let you move up a tier in a busy month and drop back the next. The limit is filing: with only a few credits included, a seller filing monthly in many states will pay for extra AutoFiles.

Zamp sells sales tax as a managed service rather than software you run yourself. Its free tier gives a one-time nexus analysis, a historical liability estimate, a product taxability review, a 30-minute call with a senior tax professional and a rate-limited 30-day API sandbox. The U.S. plan adds rooftop-accurate calculation, ongoing nexus monitoring with alerts at 80% of a threshold, automated state registrations, AI-assisted return preparation, direct ACH remittance, early-filing discount capture and notice handling by former state auditors. The U.S. + Canada plan adds GST, HST, PST and QST calculation, registrations and filings. Under the Zamp Commitment, the company covers penalties or interest caused by a Zamp-managed calculation or filing. Zamp connects to Shopify, NetSuite, Business Central, QuickBooks Online, Xero and Stripe among 30+ integrations. It does not publish prices and says each plan is scoped to your states, entities and history, so get a written quote to compare.

TaxCloud separates the software subscription from filing, so you pay for the order volume you have and the returns you file. Starter, for sellers on Shopify or Stripe, costs $199 a year billed yearly for 1,200 orders and includes return-ready reports for all states, access to the Streamlined Sales Tax program, nexus monitoring across all 50 states and phone and email support, with Shopify, Stripe, WooCommerce and CSV imports. Premium starts at $799 a year for 2,400 orders and adds real-time calculation, ERP integrations such as NetSuite, QuickBooks and Odoo, and TaxCloud API access. Filing is a separate choice: a subscription tier or pay as you go, which TaxCloud says runs as low as $20 per filing, with a surcharge for Colorado and Louisiana. Registrations, a virtual mailbox, audit support and VDA help are sold as extra services. It is a strong low-cost option, but checkout calculation and API access require Premium.

Quaderno combines tax calculation with invoicing, which makes it popular with sellers of courses, software and digital products who sell across borders. Plans are flat monthly fees by transaction volume: Hobby covers 25 transactions a month with 1 user, 1 jurisdiction and 1 integration, then Startup covers 250, Business 1,000 and Growth 2,500, each with unlimited users, jurisdictions and integrations. A transaction is any sale, refund or purchase recorded in the app, and API calls are capped at 10 times the transaction count. Every plan includes sales tax, VAT and GST calculation, threshold alerts when you near nexus, branded invoices localized to the buyer, e-invoicing support, multichannel reports and onboarding calls. Quaderno can also register you and file returns as an extra service. The pricing page showed plan amounts without a currency symbol from our location, so we marked the USD price as pending. It is lighter on US-specific filing automation than the tools ranked above it.

Vertex serves companies whose tax problem lives inside an ERP. Its sales and use tax suite centers on O Series, a tax determination engine that centralizes tax content across billing systems, cloud ERPs and custom builds, and Vertex says it covers 11,000+ U.S. jurisdictions. Around it sit Certificate Center for collecting, tracking and storing exemption certificates, Indirect Tax Returns for signature-ready and e-file returns, Express Returns for O Series Cloud users, and a compliance service that outsources monthly returns, filing and remittance. It also estimates tax on purchase orders and requisitions to tighten use tax self-assessment, which matters for buyers as well as sellers. Partner ecosystems include SAP, Oracle, Microsoft, NetSuite, Workday and Shopify, and Vertex offers consulting, support and training for rollout. Pricing is only available through sales. For a small Shopify store or early SaaS company, the setup work and cost are hard to justify; for a multi-entity enterprise it is a serious option.