tune-income - SKILL.md Agent Skill

name: tune-income description: Use whenever the user wants to set up, enhance, or double-check the income estimate of this portfolio repo — the `income:`, `cash_interest_pct`, and `tax:` blocks in data/config.yaml that drive `portfolio income` (gross) and `portfolio income --net` (after-tax). Trigger on "estimate my dividends/interest", "my income shows 0 / n/a", "add a proxy", "set the cash interest rate", "show income net of tax", "set up Teilfreistellung", "is my income/tax config right?", "which distributing twin for ", or any request to verify/fix why an accumulating ETF reports no income or why the net figure looks off. Use this even when the user just says "check my income config" without naming the fields.

⚠️ Outdated. The portfolio repo moved to a snapshot-based net-worth model (multiple institutions, ISIN categories, PDF ingest). This skill references the removed transaction/income CLI (add-buy, add-sell, import, income) and needs a rewrite. See docs/superpowers/plans/2026-06-19-multi-source-networth.md.

Tune income config

The portfolio income command estimates portfolio income as two figures — economic income (what holdings earn, market value × yield) and cash distribution (what's actually paid out) — gross by default, or after-tax with --net (a dashboard toggle does the same). It reads optional config:

cash_interest_pct: 2.0          # broker's annual interest rate on the cash balance
income:                          # per-ticker overrides; omit a ticker → use its own live yield
  WEBG.DE: { proxy: VWRL.DE }    # accumulating → borrow a distributing twin's live yield
  EUNA.DE: { yield_pct: 2.4 }    # no live twin → manual annual yield %
tax:                             # only used by `--net`; sensible German defaults if omitted
  rate_pct: 26.375               # Kapitalertragsteuer 25% + Soli (church tax → ~27.8–28%)
  default_teilfreistellung: equity   # class for holdings not listed below
  teilfreistellung:              # German partial exemption by fund type
    VOW.DE: none                 # individual stock — no exemption
    EUNA.DE: none                # bond fund — no exemption

Each income entry sets exactly one of proxy or yield_pct. Two things are silently wrong unless configured: accumulating ETFs (common in EU/Trade Republic portfolios) distribute ~nothing, so yfinance reports ~0% and the economic line needs a proxy or manual yield; and in --net mode every holding inherits default_teilfreistellung (equity → 30% tax-free) unless listed, so individual stocks and bond funds left on the default get an exemption they aren't owed and their net is overstated. This skill helps set both up and verify they're right.

What this skill does NOT do

No fabricated numbers. Never invent a yield, a cash interest rate, or assert a proxy ticker is correct without verifying it resolves. The cash rate is something only the user knows (their broker's current rate); proxy tickers must be confirmed against yfinance via the audit script, not pasted from memory. When you genuinely don't know, say so and ask or point at the factsheet — a confidently wrong financial number is worse than an admitted gap.

General config edits (categories, target weights, tickers, cash balance, adding/selling positions) belong to the assess-portfolio skill, not this one. This skill is only about the income fields.

Resources

scripts/audit-income.sh — runs the income pipeline and emits JSON findings with actionable flags. Prefer this over reading the portfolio income table when deciding what to change. Usage from repo root: ./.claude/skills/tune-income/scripts/audit-income.sh
references/proxy-map.md — how to choose a distributing-twin proxy, a starting table of twins for common accumulating UCITS ETFs, and when to use a manual yield instead. Read it whenever picking or verifying a proxy.
references/tax.md — the German net-of-tax model: rate, Teilfreistellung classes per fund type, church-tax rates, and the default-equity trap. Read it whenever setting up or checking the tax: block.

Process: double-check the config

This is the default for "is my income config right?" / "why is my income 0?".

Step 1 — Run the audit

./.claude/skills/tune-income/scripts/audit-income.sh

It returns JSON: cash, holdings[], proxy_checks[], manual_yields[], and a summary. Each holding and proxy carries a flags array. If it errors, the config or data is broken first — run uv run portfolio check and fix that.

Step 2 — Interpret the flags

Walk the findings and translate each flag into a concrete recommendation:

zero_yield_native — a holding using its own yield reports ~0%. For an ETF this almost always means it's accumulating → recommend a proxy (see references/proxy-map.md) or a manual yield_pct. For a single stock it may just mean no dividend was paid in the last 12 months (annual/suspended payer) → likely a genuine zero, no action. Distinguish by whether the ticker is a fund or a stock, and say which you think it is.
unresolved — no yield at all (not even 0). Either no override and yfinance has no data, or a configured proxy/source failed. Needs a proxy or yield_pct.
broken_proxy — a configured proxy ticker returns no yield: delisted or mis-typed (the AGGH bond-twin trap). Pick another listing from the proxy map, or fall back to a manual yield_pct.
cash_interest_unset — there's a cash balance but cash_interest_pct is 0, so cash income reads €0. Ask the user for their broker's current rate; don't guess it.
teilfreistellung_default — the holding has no explicit Teilfreistellung class, so --net taxes it as the default (usually equity, 30% exempt). That's right for an equity ETF but wrong for an individual stock or a bond fund, which get no exemption → recommend setting those to none so their net isn't overstated. The tax block in the audit shows the gross-vs-net totals so you can quote the impact. Only relevant if the user cares about the net figure.

Step 3 — Report

Lead with whether the estimate is trustworthy as-is, then a short bulleted list of gaps, each with the exact config edit that would fix it. Quote EUR figures from the audit (e.g. "SXR8.DE holds €2,058 but reports €0 income — add a proxy"). End by offering to apply the fixes.

Process: enhance / set up the config

For "set up income", "add a proxy for X", "make my income estimate accurate":

Audit first (Step 1 above) to see what's actually missing — don't add overrides a holding doesn't need.
For each flagged holding, pick the fix using references/proxy-map.md: prefer a live proxy twin; use a manual yield_pct only where no twin resolves (typically bond ETFs and cash).
Verify before committing. After adding a proxy, re-run the audit and confirm it now resolves with a plausible yield (a broad-equity proxy showing 8% means you grabbed the wrong fund). This verify-the-proxy loop is the whole point — a proxy that doesn't resolve silently understates income.
Set cash_interest_pct from the rate the user gives you.
If the user wants net-of-tax, set up the tax: block — read references/tax.md. The key move: list every teilfreistellung_default holding that is an individual stock or bond fund as none; leave equity ETFs on the default. Ask whether they pay church tax (it changes rate_pct); don't assume it.
Validate: uv run portfolio check (structural) then re-run the audit until the summary shows 0 unresolved / 0 broken proxies (and, if net matters, no stray teilfreistellung_default on stocks/bond funds).
Offer to show the before/after with uv run portfolio income (add --net if tax was configured).

Editing notes

The config loader rejects an income entry that sets both proxy and yield_pct, or neither, or names a ticker not in any category — so a failed portfolio check/load after your edit usually means one of those.
Keep edits minimal and idiomatic: only add income entries for holdings that need them; leave distributing stocks out entirely.
Changes write to data/config.yaml; git restore data/config.yaml undoes them.