Sales Tax Calculation API is Now Available

Seller Ledger on June 26, 2026

Seller Ledger recently announced the ability to help eCommerce sellers track and report on their sales tax obligations. To make that possible, we built out a full sales tax engine, complete with state and local jurisdiction-level breakdowns. Now we are making that functionality available to developers and potential partners through the release of a sales tax calculations endpoint in our API.

How to calculate sales tax

To accurately calculate the sales tax on an eCommerce order, you need to know a number of things:

  1. The amount of each item within an order
  2. Whether shipping was collected from the customer and whether it is taxable
  3. The shipping address of the purchasing customer
  4. The states where you have nexus (physical or economic)
  5. The sourcing rules for a given order
  6. Whether the specific item is subject to any special tax rules or exemptions

Fortunately, Seller Ledger makes all of that simple. We automatically track nexus for you based on your account. And we make it very easy to submit the necessary information to our API to get the right amount to collect. If you collect enough information to properly fulfill an order, you will have enough information to tell Seller Ledger what it needs to know.

Coming soon: Product taxability

As of the date of this post, we are still working on a comprehensive set of product taxability rules. Stay tuned for that release.

Get the full breakdown

Because we have a pretty extensive history in sales tax (our founders ran product and engineering for TaxJar,) we know that a single tax amount isn’t sufficient for all clients. So, our API returns not only the total amount of sales tax due on an order, but we also break it down by how much is owed to each jurisdiction, including:

  • State amount collected
  • County amount collected
  • City amount collected
  • Special district amount collected

To learn more about our new sales tax calculations endpoint, visit our API documentation.

View documentation

Pricing

Pricing for sales tax calculations is the exact same as it is for Seller Ledger. We simply charge you based on the number of monthly transactions you have flow through our system. Plans start at $10 per month with a 30-day free trial.

Ready to automate your eCommerce bookkeeping?

Join thousands of sellers who save hours every month with Seller Ledger.

Start your free 30-day trial

No credit card required

Automate Accounting for Square Sellers

Seller Ledger on June 23, 2026

In our continued efforts to simply eCommerce accounting, we’re pleased to announce the ability to sync your Square account with Seller Ledger. This provides the biggest step to better automate accounting for Square sellers. This functionality is now in open “beta”, meaning anyone can try it.

As we did before with our Shopify integration, we allow Square sellers to bring in both online and point-of-sale transactions.

To link your Square account, simply click the “Add Channels, Banks and Accounts” button on your dashboard. Then, click the Square logo:

Log in to Square and, once you are returned to Seller Ledger, we will begin importing you transaction history. Doing so will allow us to bring in sales, returns, fees and even sales tax that you may have collected – all broken out in detail and summarized to help you with tax filing.

And as with any new functionality, we’d love to hear any constructive feedback you might have. Email us at [email protected].

Ready to automate your eCommerce bookkeeping?

Join thousands of sellers who save hours every month with Seller Ledger.

Start your free 30-day trial

No credit card required