Background context for housing loan tax credit (住宅ローン控除) in the shinkoku tax filing plugin. Contains eligibility requirements, credit limits, calculation rules, and interaction with furusato-nozei for the current tax year. This skill is not user-invocable — Claude loads it automatically when responding to housing loan tax credit questions or calculations.
NewMaintained
Automatic
◆Finance & Accounting pack
Last verified 8/21/2026
What it changes
Passed 20 of 22 test cases with the skill, and 20 of 22 without it.
Without skill91%
With skill91%
Checks it passed that the model alone missed
Mentions values and parameters explicitly for Reiwa 7 (2025)
Includes guidance or confirmation regarding the bonus measure for households with children or young couples
1 fixed19 passed either way1 still failing1 broke
Pass-rate lift
0 pp
Tokens
-25%
Agent turns
0%
Response time
-33%
Model gemini-3.6-flashMeasured 8/21/2026v120 of 22 cases passed with skill
Tokens, turns and time describe resource use, not a dollar price.
See it in action
A test case the skill fixed. Same model, same prompt, with and without the skill.