Source: https://guthlabs.ai/docs/instruments/declining-balance-double-declining-depreciation/qualification/

instrument qualification / verified-with-binding-errata

# Declining Balance / Double-Declining Depreciation qualification

Verified with errata that must be applied at binding time.

Status: **VERIFIED_WITH_ERRATA**Lifecycle: **verified-with-binding-errata**

## Ledger verdict

Verified with errata that must be applied at binding time.

**Status**: VERIFIED_WITH_ERRATA

**Tranche**: tranche-5

**Review vectors**: 4

**Ledger rows**: 1

## Applied errata

````
[
  {
    "vector": "1,2",
    "field": "depreciation[2:] / ending_book_value[2:]",
    "wrong": "v1 866.67×3, v2 1343.75×2",
    "correct": "v1 1440/864/296, v2 1757.81/929.69 (greater-of rule as stated in inputs)",
    "cause": "switched to straight-line while DB was still GREATER, violating the switch rule stated in her own inputs"
  }
]
````

## Adversarial re-test context

The full catalog was re-tested from boundary, convention, and self-check angles in 2,787 requests. Five genuine computational defects were independently verified and corrected. This page reports the current ledger state for this instrument; it does not imply product deployment or interface qualification.

## Release gate

Bind every attached correction, replay the affected vectors, enforce boundary validation, and preserve evidence before describing the executable surface as qualified.

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/declining-balance-double-declining-depreciation/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/declining-balance-double-declining-depreciation/mechanism/>)[03**Implementation**](<https://guthlabs.ai/docs/instruments/declining-balance-double-declining-depreciation/implementation/>)

## Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

- `VERIFIED_LEDGER.json`

- `STRESS_TEST_RECEIPT.json`

- `tranche errata record`