Before you switch, bring the hard cases.
Five representative transactions. Equivalent inputs. A record of what worked, what differed and what still needs an answer.
Choose five cases that could change your decision.
A normal sale is useful. A disputed location, missing product, certificate boundary, partial credit or retry often reveals more. Pick the cases your team actually has to handle.
- Freeze the facts. Use the same date, addresses, product identity, nexus, certificate evidence, channel responsibilities and rounding assumptions.
- Record both outputs. Use authorized access and document each engine’s version and configuration. Leave a vendor result blank when it has not been supplied.
- Explain every difference. Separate a tax difference from a scope mismatch, missing evidence or unsupported operation. Keep unresolved results visible.
- Make the buying decision. Confirm supported coverage, integration mode, review workload and commercial terms for the product you need.
Bring your five hard transactions.
Tell us what needs to work. We’ll confirm the private evaluation path and scope for your calculation engine or compliance workflow.
Run the public examples again.
No account or key needed. This runs the address lookup and package writer afresh with the disclosed inputs. It does not run your own transactions or submit a return.
Evidence you can inspect. Limits you can see.
The business data is synthetic. The address example uses a small official-derived historical Illinois sample. The other executions use an isolated sandbox database, disclosed inputs and the same service implementations used by the application. No customer records, filings, payments or competitor credentials were used.
The pack distinguishes local component execution from hosted API execution. The optional replay script records your own sandbox results, including failures; it does not recreate the private reference database or certify a provider. Confirm supported coverage and effective dates before evaluating a real workflow.
Sales Tax Engine · Sales Tax Compliance · API coverage contract · Current pricing