Both products calculate sales tax through an API. TaxJar also offers transaction reporting and AutoFile. Sales Tax Calculator API focuses on calculation, coverage, transaction records, adjustments, and batches. The main decision is whether you want tax operations from the same provider.
Compare the parts you would use
The APIs overlap on tax calculations, but the surrounding products differ. Use this table to identify which features belong in your migration plan.
| Question |  Sales Tax Calculator API |  |
|---|---|---|
| Calculation request | Send seller and customer facts, line items, tax codes, currency, and transaction details to the calculation endpoint. | Send origin, destination, and order or line-item details to the `POST /v2/taxes` endpoint. |
| Calculation response | Returns amounts and an outcome such as `qualified`, `review_required`, or `unsupported`. | Returns a tax amount and a jurisdiction breakdown for the supplied order. |
| Saved transaction | Create a transaction separately when your application needs a persistent transaction record. Adjustments and batches have separate API operations. | TaxJar has separate transaction endpoints for records used in reporting and filing workflows. |
| Published API pricing | $5 per 1,000 authenticated API calls on Developer. Launch is $29 for 15,000 API calls. | Monthly order tiers. Each API calculation or rate lookup counts as 0.1 order. Professional 1K is listed at $499 per month as of September 25. |
| Other tax services | The API does not provide registration, obligation monitoring, reporting, or return filing. | Offers reporting and AutoFile for supported US tax workflows. |
| Developer setup | REST API, request logs, usage, and keys in the developer dashboard. Node.js and Python SDKs are available. | REST API, official API reference, and client libraries in several languages. |
| A closer fit when… | You want a calculation API and already manage the surrounding tax records and services. | Your team wants calculations alongside TaxJar transaction reporting or AutoFile. |
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Feature and plan availability can depend on the account. Confirm current terms before replacing a production integration.
A month with 10,000 API calls
Our Launch plan is $29 per month and includes 15,000 authenticated API calls to public endpoints. Ten thousand calls fit within that allowance, whether they request calculations, coverage checks, transactions, adjustments, or batches.
TaxJar counts ten calculation or rate-lookup calls as one order. That makes 10,000 of those TaxJar calls equal to 1,000 order units. The TaxJar support page lists Professional 1K at $499 per month as of September 25, 2026. Compared with Launch at $29 per month, TaxJar is $470 higher per month.
TaxJar has announced that new prices take effect October 1, 2026. Check the current pricing page and your account terms before relying on the $499 figure. The plans include different services, so compare the $470 as a difference between listed prices, not as the total cost of equivalent plans.
| Usage example | Sales Tax Calculator API | |
|---|---|---|
| 10,000 authenticated API calls to our public API | $29 Launch plan includes up to 15,000 API calls. | If these are TaxJar calculation or rate-lookup calls, they count as 1,000 order units. Professional 1K is listed at $499/month before the announced October 1 pricing change. |
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Our allowance counts authenticated API calls across public endpoints. TaxJar counts calculation and rate-lookup calls as order units. Its listed price may change October 1, 2026.
Keep TaxJar if its services are part of the workflow
TaxJar may be the simpler choice when staff use its transaction reports, order imports, or AutoFile. Those features reduce the number of systems your team has to connect. Before switching, list each report, filing task, and transaction record you depend on, then price the replacement for all of them.
Compare a focused API if those jobs already live elsewhere
A separate calculation API may fit when your own application stores the underlying records and another service handles filing. Here, a calculation response includes an outcome that tells your application whether the result is qualified, needs review, or is unsupported. The coverage endpoint can check a tax code, transaction type, customer type, jurisdiction, and date before you send production data.
- Keep reporting and filing with your current provider or tax team.
- Check that the API supports the fields and locations in your actual requests.
- Decide which calculation responses should be saved as transactions.
- Budget for the API and any separate tax services your team still needs.
Check the integration before you move it
Use the same dated records in both APIs and compare how they handle your inputs. Include routine cases and a few that exercise your transaction model.
- Match seller and customer locations, tax codes, line items, currency, and transaction dates.
- Test a refund, an adjustment, and an incomplete or conflicting address.
- Compare the amount, response status, tax breakdown, and saved record.
- Replay a duplicate request and review retry behavior.
- Calculate the monthly cost using your actual call and order counts.
- Confirm who owns reporting, registrations, support, and filing after the change.
Sources
We checked the API references, product pages, and pricing details linked below on September 25, 2026. This article is written by the Sales Tax Calculator API team. We did not run a shared test set, so the comparison describes product scope and published terms rather than calculation accuracy or speed. TaxJar’s announced October 1 price change may affect its listed tier.