CTR-TAX · version 2

Indirect Tax Engine — Tax determinations

The oldest validation on the register. more

RatifiedIn contract

What the contract says

These are the terms the connector is generated against. more

Entity

Tax determination · inbound

Primary key

determinationId

Declared volume

1,900 records a day

Freshness commitment

1 d

Owner

F. Aubert · Tax Technology

Vendor

Vertex · high criticality · modeled

Cardinality

One transaction line to one determination. A re-determination supersedes rather than appends.

Write-back rule

None. Tax determination is authoritative at the engine and the platform records the outcome.

Review state

Neither review is performed by the team that wrote the contract.

Security reviewApproved

M. Lindqvist · Jun 18, 2026

Privacy reviewApproved

Dr. Katrin Wehner · Jul 10, 2026

Validation and drift

Drift is only detectable on a contract that has been read against a sample.

Last validatedJul 16, 2026 · 33 d ago

2,000 records read in the sample.

The oldest validation still standing, and old enough that it should be repeated.

The field list

4 fields · 1 key · 0 personal. The validation rule on each row is what admits or rejects a record at the staging boundary.

Field	Source	Target	Type	Flags	Drift	Validation
Determination id	determination.id	taxLine.ref	string(30)	keyinternal	In contract	Unique.
Tax code	determination.taxCode	taxLine.code	string(10)	internal	In contract	Must resolve against the code table for the jurisdiction.
Rate	determination.rate	taxLine.rate	decimal(7,4)	internal	In contract	Between 0 and 1.
Jurisdiction	determination.jurisdiction	taxLine.jurisdiction	string(20)	internal	In contract	Declared jurisdiction only.

What has passed the staging boundary against this contract

1 batch · 2,840 arrived · 2,722 admitted · 118 quarantined · 0 rejected

Staging boundary

Batch	Arrived	In	Admitted	Quarantined	Rejected	Result	Gate
STG-0024	Aug 17, 14:00	2,840	2,722	118	0	Partly admitted	2,722 admitted · 118 quarantined · 0 rejected outright.

Rejects raised against these batches

1 reason covering 118 records. Each one names a field, what was observed and what the contract expected.

Tax code does not resolve for the declared jurisdiction118 records · 19 h oldFix at source

Observed: 6 codes with no entry in the jurisdiction table

Expected: A code in the jurisdiction table

STG-0024 · field taxCode · queue quarantine · F. Aubert

Replay windows

1 window recorded against this contract.

Replay register

RPL-009Completed

Source correction · Jul 11, 2026 to Jul 17, 2026

A rate table was corrected retroactively for two jurisdictions.

5,620 replayed · 5,473 held at the idempotence key · 0 duplicates created

Write-back routes into this system

No write-back route is designed into this system.

Write-back register

What this contract is, and what it is not

A contract, a validation rule, a freshness commitment and a replay path are real mechanisms and they are what this wave builds. more

The last validation read 2,000 records 33 days ago, which is 105% of a single day at the declared volume. A sample proves the shape of what it read and nothing beyond it.