# Trade-in Valuator

> Use to valuate the buyer's trade-in vehicle (KBB / private party / wholesale / dealer allowance), compute state trade-in tax credit, handle lien payoff timing, and decide separate-sell vs trade-in. Triggers include "valuate my trade", "what's my Civic worth", "KBB vs private party", "trade-in tax credit", "lien payoff", "评估置换车", "卖给 dealer 还是私卖", and Spanish phrases "evaluar mi carro a cuenta", "…

- **Type:** Skill
- **Install:** `agentstack add skill-daizedong-buy-me-a-car-trade-in-valuator`
- **Verified:** Yes — security-reviewed for prompt injection and unsafe behavior
- **Seller:** [DaizeDong](https://agentstack.voostack.com/s/daizedong)
- **Installs:** 0
- **Category:** [AI & ML](https://agentstack.voostack.com/c/ai-and-ml)
- **Latest version:** 0.1.0
- **License:** MIT
- **Upstream author:** [DaizeDong](https://github.com/DaizeDong)
- **Source:** https://github.com/DaizeDong/buy-me-a-car/tree/main/skills/trade-in-valuator

## Install

```sh
agentstack add skill-daizedong-buy-me-a-car-trade-in-valuator
```

Requires the [AgentStack CLI](https://agentstack.voostack.com/docs/cli). Works with Claude Code, Cursor, and any MCP-compatible agent.

## About

# Trade-in Valuator

> **Caveat**: this skill is one author's playbook + 5-scenario stress test. Verify state fees / CPO terms / EV credits / dealer practices against current sources before quoting numbers to a dealer or making financial decisions. Not tax, legal, or financial advice.

last_verified: 2026-05-18

Narrow-trigger skill: produce a defensible trade-in valuation, decide
separate-sell vs trade-in, and stage lien-payoff timing. Defers full reference
content to `../orchestrator/references/trade_in.md` and state-specific tax
mechanics to `../orchestrator/references/state_fees.md`.

## When to invoke

User says any of: "valuate my trade", "what's my Civic worth", "KBB vs private
party", "trade-in tax credit", "lien payoff", or the CN triggers in the
frontmatter. Skip this skill if there is no trade (Phase 1 trade gate = NO).

## 5-anchor valuation framework

Per `../orchestrator/references/trade_in.md` Section 1: every trade vehicle has
four book/market valuations -- and for **EVs and PHEVs, a fifth anchor: battery
State of Health (SoH)**. Capture every applicable anchor at Phase 1 --
misreading them is the #1 source of buyer loss in trade-in deals.

| # | Anchor | What it is | Typical relationship | Role |
|---|---|---|---|---|
| 1 | KBB Instant Cash Offer | Real cash a participating dealer will pay TODAY, no negotiation | Lowest of the four (dealer floor) | Walk-floor outside option. Any dealer trade offer below this is asking buyer to subsidize. |
| 2 | KBB Trade-In Value (Fair condition mid) | KBB book trade-in value at stated condition | $600-$1,300 above KBB Instant Offer | Mid; fair dealer trade target. Use as primary anchor. |
| 3 | KBB Private Party Value | What buyer can realistically sell for on Craigslist / FB Marketplace | $1,500-$3,000 above KBB Trade-In; transacts 7-14 days for clean 1-owner | Upper bound; the price the buyer trades convenience for. |
| 4 | Wholesale (Manheim MMR / Black Book) | Dealer auction acquisition floor | Lowest; dealer-internal | Internal benchmark only; buyers rarely see MMR. Estimate ~5-10% below KBB Instant Offer for popular models. |
| **5** | **Battery State of Health (SoH)** -- **EV/PHEV only** | **Verified pack capacity retention (%) from OBD-II / dealer scan / mfr app -- NOT the dashboard range estimate** | **Cross-cutting modifier on anchors 1-4, not a standalone $ figure** | **The dominant EV factor: for a used EV the pack is the most expensive component, so SoH moves resale more than paint/trim/often mileage. Books usually ignore it -- so treat books as a soft ceiling and adjust for SoH.** |

Also useful: NADA Trade-In Clean is often $300-$700 above KBB Trade-In on
popular Hondas/Toyotas; treat as higher-of-two-books anchor when negotiating.

### Anchor 5 -- battery SoH (EV/PHEV trades)

For any EV or PHEV trade, books (KBB/NADA/Black Book) systematically miss the
battery: they often apply **no SoH adjustment**, lag fast EV price swings by
months, and lump EVs onto an ICE depreciation curve. So anchors 1-4 are
necessary but not sufficient -- layer SoH on top. Approximate market behavior
(verify; no rigid formula -- dealers apply an invisible adjustment table):

| SoH band | Effect vs. a healthy peer (same model/age/miles) |
|---|---|
| 90-95%+ | Premium / supports book |
| ~85-89% | Roughly book; minor or no deduct |
| ~80-84% | Begins to discount |
|  **§ 25E is TERMINATED (2025-09-30) — and was always a separate transaction.**
> The federal Used Clean Vehicle Credit (IRC § 25E, formerly up to $4,000) was
> **terminated by OBBBA (Public Law 119-21) for any vehicle acquired after
> 2025-09-30** — it is **not available for a 2026 used-EV purchase** and must NOT
> be counted in OTD / net-price math. See the CRITICAL banner in `ev-buyer-helper`.
> Separately (and even when it existed), § 25E attached to the buyer **purchasing**
> a qualifying used EV, NOT to the EV being **traded away** — so it never offset a
> trade valuation regardless. Historically its $25,000 price cap was measured
> **before** trade-in value, so a big trade allowance did not slip a car under the
> cap. Full mechanics + historical detail (price cap, MY≥2yr, dealer point-of-sale
> transfer + IRS ECO reporting, MAGI caps, termination 2025-09-30) live in
> `../orchestrator/references/ev_buyer_playbook.md` § 25E and `trade_in.md`
> Section 13e (HISTORICAL). Do not conflate the two, and do not present § 25E as a
> live buy-side credit.

## Capture-all-four checklist (12 fields)

Per trade_in.md, the prior 6-field placeholder is insufficient. At Phase 1
capture: (1) Year/make/model/trim, (2) Mileage, (3) Title status, (4) Lien
holder + payoff balance, (5) Key count, (6) Cosmetic issues, (7) Mechanical
issues, (8) KBB Instant Cash Offer + screenshot, (9) KBB Trade-In Value at
stated condition, (10) KBB Private Party Value, (11) NADA Trade-In Clean,
(12) Wholesale estimate (MMR or Black Book if available). **EV/PHEV adds
(13) verified battery SoH % + report source (OBD-II / dealer scan / mfr app) +
report date, and (14) does the factory battery warranty transfer to the next
owner? (Y/N + remaining term).**

## State trade-in tax credit matrix

Excerpt from `../orchestrator/references/state_fees.md`. In states allowing
trade credit, sales tax applies to NET (sale price minus trade allowance), not
gross.

| Trade credit status | States |
|---|---|
| YES (full, uncapped) | NJ, NY, PA, TX, OH, NC, GA, WA, DC, MD, FL |
| YES (capped first $10k) | IL |
| YES (capped first $9k) | MI |
| NO | CA, KY, VA |
| N/A (no sales tax on vehicles) | OR, MT, NH, AK, DE |

Worked example -- NJ $25k sale + $10k trade:
- Tax base = $25,000 - $10,000 = $15,000
- NJ sales tax 6.625% on $15k = $993.75
- Without trade credit: 6.625% on $25,000 = $1,656.25
- Trade credit saves $662.50

Same deal in CA (no credit): tax base stays $25k, savings = $0. Move the trade
to a separate private-party sale if the state-loss is large.

## Separate-sell vs trade-in decision

Decision rule:

- Private-party premium = (KBB Private Party) - (Dealer Trade Allowance)
- Trade-credit value = (Trade Allowance) * (State combined tax rate, if credit)
- If private-party premium > trade-credit value + buyer's convenience price
  ($1,000-$3,000 typical), sell separately.
- Else trade in.

In NJ at 6.625% with a $15k trade allowance vs $17k private party: premium =
$2,000; trade-credit value = $993; net cost of trading = $2,000 - $993 = $1,007.
If buyer values convenience > $1,007, trade in; otherwise sell separately.

In CA same numbers: premium $2,000; trade-credit value $0. Sell separately
almost always wins.

## Lien payoff workflow

Per trade_in.md Section 4 (a-d):

| When | Step | Detail |
|---|---|---|
| T-7 days | Request 10-day payoff letter from lien holder | Letter states exact dollar amount valid through a date 10 days out. Some lien holders charge a $25 admin fee. |
| T-3 days | Dealer cuts payoff check, overnights to lien holder | Clearance typically 5-10 business days. Get a copy of the check + tracking number from dealer F&I. |
| T+0 (delivery) | Title transfer pending lien release | Dealer holds title work until lien release arrives. Buyer drives away on temp tag. |
| T+14-30 | Lien release filed with state DMV | New title issued to dealer (or assigned to next buyer). Confirm release was filed; some lien holders are slow. |

If payoff balance > trade allowance (underwater trade): the difference is rolled
into the new loan principal (cheapest financing) OR paid out of pocket. Disclose
to dealer at Phase 1 -- hiding negative equity blows up Phase 9.

## High-mileage trap

For vehicles over 100,000 miles:
- KBB Instant Cash Offer often returns "no offer" or unrealistically low.
- Private party is the realistic-only path; expect 14-30 days on market.
- If buyer cannot wait, accept dealer wholesale offer is essentially MMR.

## Separate-the-negotiation 5-round protocol

NEVER let the dealer shell-game sale price against trade allowance.

1. Round 1: Agree the new-car OTD (no trade mentioned). Lock in writing.
2. Round 2: Introduce trade. Ask for dealer's blind trade offer.
3. Round 3: Compare dealer offer to KBB Instant Cash Offer (anchor #1). If
   dealer offer 
  Vehicle: 
  Anchors: KBB-Instant $X / KBB-Trade $Y / KBB-Private $Z / NADA $N
  Battery (EV/PHEV only): SoH  via  on ;
    warranty transfers? ; SoH adj to book: 
  Lien: $payoff balance, holder, 10-day letter on file? (Y/N)
  State: , trade credit: 
  Tax savings if traded: $
  Decision: TRADE-IN vs SEPARATE-SELL (with reasoning)
  Walk-floor: $
  Negotiation target: $
```

Hand off to Phase 6 negotiation when traded; hand off to private-party listing
help when separate-sell.

## Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

- **Author:** [DaizeDong](https://github.com/DaizeDong)
- **Source:** [DaizeDong/buy-me-a-car](https://github.com/DaizeDong/buy-me-a-car)
- **License:** MIT

Install and usage instructions live in the source repository linked above.

## Pricing

- **Free** — Free

## Security capabilities

Automated source analysis of v0.1.0 — what this tool can access:

- **Network access:** no
- **Filesystem access:** no
- **Shell / process execution:** no
- **Environment & secrets:** no
- **Dynamic code execution:** no

*"Yes" means the capability is present in the source — more access means more to trust, not that it is unsafe.*


## Versions

- **0.1.0** — security scan: passed — Imported from the upstream source.

## Links

- Listing page: https://agentstack.voostack.com/l/skill-daizedong-buy-me-a-car-trade-in-valuator
- Seller: https://agentstack.voostack.com/s/daizedong
- Browse the marketplace: https://agentstack.voostack.com/browse

---
Listed on AgentStack — the marketplace for AI agent skills and MCP servers. Every listing is security-reviewed. Creators keep 70%.