TaxJar in Polar: tax out of the top line, before you read margin.
TaxJar calculates and files the tax. What it does not do is take it out of the revenue you report, so top line and margin quietly include money that was never yours. Bring collected tax, liabilities and jurisdictions into Polar and revenue is net, market by market.
/Setup Guide
How to Connect TaxJar to Polar.
A Polar account with Shopify connected, admin on your TaxJar account, and Polar's AI Data Engineer, which builds the connector from a plain-language request.
01 · What you need
A Polar account with Shopify
A Polar account with Shopify connected. TaxJar data only means something read against the orders behind it.
Connect your data →Your TaxJar account
Admin access to TaxJar, with the transaction, liability and jurisdiction reporting for the markets you sell in.
Open TaxJar →Polar's AI Data Engineer
No native TaxJar connector yet? Describe what you need in plain language and the AI Data Engineer reads the TaxJar API, writes the connector and pipes it into your warehouse, in minutes.
02 · Bring TaxJar into Polar
1
Ask for the connector ~ minutes
Plain language, no code.
Tell Polar's AI Data Engineer what you want from TaxJar in plain language. It reads the source documentation, lays out everything the API offers by category, then writes the connector and pipes the data into your warehouse as governed data. No code, and it ships in minutes.
Worth knowing: this also works on connectors you already have. If the TaxJar API exposes a field, you can have it, down to a single hidden one the standard connector never pulled.
2
Tax out of revenue automatic
Net, market by market.
Polar matches TaxJar transactions to your Shopify orders and takes collected tax and duties out of reported revenue, so the top line and every margin below it are net.
3
Liability in view the payoff
Exposure, visible.
Liability by jurisdiction sits next to the revenue that created it, so threshold exposure in a new market is visible before it becomes a filing problem.
Side by side
TaxJar files the return. Polar takes it out of your margin.
Collected tax passes straight through the business, but it sits inside reported revenue, so every percentage computed on top of it flatters. TaxJar handles the filing; Polar removes the tax from the top line, market by market.
TaxJar on its ownon its own
+TaxJar with Polarblended
Collected tax inflates the reported top line.
Revenue net of tax, before any margin is calculated.
Margin percentages are computed on money that was never yours.
Contribution margin per market, on net revenue.
Registration thresholds are discovered, not anticipated.
Exposure per jurisdiction, against the revenue trend.
Duties and import charges sit outside the reporting.
Cross-border cost read against the margin it leaves.
The Gap
The connector is only half of it.
Once TaxJar is modelled against your real orders inside Polar, you can use the result wherever you already work. Ask Polar in plain language, pull it live through the Polar MCP, or schedule it into the report your team reads every morning.
TaxJar
collected tax, liabilities, jurisdictions
Polar
governed, blended metrics