What is tax-deduction-finder?

A transaction review assistant for finding business expenses that may qualify as tax deductions under German rules. Tax deductions are costs that can reduce the income used to calculate tax.

It helps review spending such as office costs, software, equipment, travel, training, and professional memberships for a German freelancer or small business.

It helps reveal expenses that may be missing, wrongly categorized, or not yet checked, so fewer possible deductions are overlooked.

tax-deduction-finder — Skill for Claude Code by norman-finance

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add norman-finance/norman-mcp-server --skill tax-deduction-finder

Clone the repo

git clone --depth 1 https://github.com/norman-finance/norman-mcp-server

Made for: Claude Code.

Or install norman-finance, the plugin that ships this one along with the rest of its 20 skills, 2 MCP servers.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/norman-finance/norman-mcp-server/tax-deduction-finder/github.svg)](https://agentmods.dev/skills/norman-finance/norman-mcp-server/tax-deduction-finder)

Your own site

<a href="https://agentmods.dev/skills/norman-finance/norman-mcp-server/tax-deduction-finder"><img src="https://agentmods.dev/badge/skills/norman-finance/norman-mcp-server/tax-deduction-finder/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/norman-finance/norman-mcp-server/tax-deduction-finder"><img src="https://agentmods.dev/badge/skills/norman-finance/norman-mcp-server/tax-deduction-finder.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 52 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 641 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits

NVIDIA SkillSpector pass 7 Sept 2026

How audits are shown

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00052	$0.00641
Opus 5	$0.00026	$0.00320
Sonnet 5	$0.00010	$0.00128
Haiku 4.5	$0.00005	$0.00064

Measured 13d ago against content hash dcd07d01a721, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

tax-deduction-finder scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 13d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/tax-deduction-finder/SKILL.md · 72 lines

How it starts

The opening of the file, as written. The whole thing — 72 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Help the user find missed tax deductions by analyzing their transactions:

Step 1: Gather data

Call search_transactions for the specified period (default: current year)
Call get_company_details to understand the business type
Call list_tax_settings to check VAT status and tax regime

Step 2: Scan for common deductions

Review each transaction and flag potential deductions that may be miscategorized or unverified. Look for these common German freelancer/small business deductions:

Home office (Arbeitszimmer):

Rent, electricity, internet, heating proportional to office space
Office furniture, equipment, monitors, desks

Technology & software:

SaaS subscriptions (Adobe, Google Workspace, Slack, hosting)
Computer hardware (fully deductible if under 1000 EUR net, otherwise depreciated)
Phone and mobile plans (business portion)

Travel & transportation (Reisekosten):

Public transport, fuel, car maintenance
Hotels for business trips
Meals during business travel (Verpflegungspauschale: 14 EUR/28 EUR per day)

Professional development:

Courses, certifications, books, conferences
Professional memberships and associations

Insurance & financial:

Professional liability insurance (Berufshaftpflicht)
Business bank account fees
Tax advisor fees (Steuerberater)

Marketing & client acquisition:

Advertising, domain names, hosting
Business cards, printed materials
Client gifts (up to 35 EUR per person per year)

Step 3: Suggest corrections

For each potentially missed deduction:

Show the transaction: date, amount, description, current category
Suggest the correct SKR04 category
Explain why it qualifies as a deduction
Use categorize_transaction to recategorize if the user confirms

Step 4: Estimate impact

Present a summary:

Number of transactions reviewed
Number of potential missed deductions found
Estimated additional deductible amount (EUR)
Approximate tax savings (rough estimate using ~30-42% marginal rate for Einkommensteuer + Soli)

Read the full file on GitHub · 72 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

13d ago First seen · 72 lines · 52 tokens per session scan A dcd07d01a721

Subscribe to this mod's changes

tax-deduction-finder is a skill published in the GitHub repository norman-finance/norman-mcp-server (54 stars, last pushed 2d ago), licensed MIT. It adds 52 tokens to every session and 641 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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