The library
Every move, in one place.
117 free lessons. The whole practice, tax through advisory, plus building your own tools.
Tap one, or describe what you're stuck on below.
New here? Start with Compliance & safe AI use (free) and go in order. Jump anywhere once it clicks. The Builder track is its own path. Start it whenever you want AI building FOR you.
§ Ask Ledger for a lesson on anything
Describe a real thing you need to get done. Ledger builds the drill from your exact situation.
The client work
Returns to notices to advisory. 12 desks · 32 lessons on the client work, all free.
1Compliance & safe AI use (free)7 lessons›
Client information under s. 7216, grounding, and what never gets pasted. The skeleton, practiced to reflex.
2Workflows & automation5 lessons›
Design a repeatable task into an AI workflow. With a human approval gate exactly where it belongs.
3Claude & Cowork mastery3 lessons›
One platform, mapped to the job: a Project for your standing context, a Cowork skill for a repeatable prompt, MCP connectors for your live inbox and calendar.
4Client data and s. 72166 lessons›
What counts as a disclosure and why a paste is one, de-identifying a fact pattern in sixty seconds, the consent that satisfies the regulation, which tools need one, and red-teaming last week's prompt.
5Tax research that survives review6 lessons›
Ask a question the model cannot answer from vibes, force the citation and open it, the three shapes of fabricated authority, settled against unsettled, the memo from a messy email, and when to stop and call it a position.
6The practitioner's week5 lessons›
Audit the week before you hand the first task over, catch the section that does not say what the answer says, cost the scripted run, wrap the day into the workpapers, and know where a return goes when you paste it.
7Notices, exams and resolution0 lessons›
Translate a notice into what the client has to do, draft the abatement request from the facts, build the exam response index, explain an assessment without promising an outcome. Written next.
8The close and client accounting0 lessons›
Turn a messy trial balance into a close checklist, list the exceptions the model cannot explain, draft the month-end narrative an owner will read, chase the missing forms without forty emails. Written next.
9Financial statements and reporting0 lessons›
Footnote language from the facts, variance analysis that says why, the line between compilation, review and audit, management letter comments a client acts on, the no-assurance line and where it goes. Written next.
10Advisory and planning0 lessons›
Entity selection the client can follow, the quarterly estimate explainer with assumptions on the page, scenarios without an invented rate, the year-end letter by client type, and pricing the advisory engagement in writing. Written next.
11Practice, staff and season0 lessons›
Engagement letter scoping from a discovery call, the intake questionnaire that prevents February, review notes that teach, triage by risk, the fee increase letter, and the firm's own AI use policy. Written next.
12Independence and ethics in practice0 lessons›
Independence in one question, nonattest services and the self-review threat, conflicts between two clients in one deal, what the Confidential Client Information Rule adds, Circular 230 due diligence on a model's draft, and whether to disclose your AI use. Written next.
Builder track
Stop using AI. Start building with it. Claude Code, skills, agents, and systems that run without you. 13 areas · 85 lessons, capability-first, all free.
B1Setup & first contactInstall Claude Code, meet the terminal, and have your first real conversation about the work on your desk.›
B2The project brainCLAUDE.md sets the trajectory: your firm's standing context, your voice, your client-data rules, baked in.›
B3Steering & safetyA minute of planning saves ten of building, and it is the difference where return information is involved.›
B4Context engineeringKnow what fills the window before you paste a 300-line trial balance into it.›
B5The verify loopTask -> do -> verify. On a memo, the verify step IS the work; skip it and you have signed a guess.›
B6Skills: package your processThe close checklists and review procedures you already keep become software the AI runs the same way every month.›
B7Connect your tools (general-ledger exports, calendar, your data)Connectors that let it read the general-ledger export and the calendar, plus skills other people built for you: install, vet, audit. Nothing identifiable goes through one you have not read.›
B8The DO frameworkCode executes, the LLM judges. Compound error math explains why a long chain drifts, and why a figure never comes from the judge.›
B9Subagents & parallel workFan out when it pays; feeling productive isn't being productive. The reviewer agent is the one worth running.›
B10Design: proposals & client one-pagersEngagement proposals, the client one-pager and the year-end letter that look designed, built against a reference you supply.›
B11Firm & data agentsReconciliations, close packages and the month-end narrative that produce themselves, from exports you de-identified first.›
B12Ship a real toolWebhooks, schedules, observability, one durable tool for the firm, demoed.›
B16The work folderFrom chat to a folder of your own files that one agent reads and writes. Keep a list of your corrections, turn it into a skill, shape the folder around the work, and hand it on.›
Vendor notes, dated
Prices and plan names move. Each note says when it was looked up, whether a person has confirmed it, and the day it comes due. Past that day, treat it as a question.
- Claude. Claude Pro is $20 a month billed monthly, or $17 a month billed annually. Researched Oct 6, 2026, not yet confirmed by a person, recheck by Dec 15, 2026.
- ChatGPT. ChatGPT Plus is $20 a month. Researched Oct 6, 2026, not yet confirmed by a person, recheck by Dec 15, 2026.
- Google Gemini. Google Gemini's paid consumer plan is Google AI Pro at $19.99 a month; Google AI Ultra starts at $99.99 a month. Researched Oct 6, 2026, not yet confirmed by a person, recheck by Dec 15, 2026.
- Anthropic. Anthropic's consumer plans (Free, Pro, Max) may use chats to train models under a setting the user controls, with five-year retention when training is on and 30 days when it is off; Claude for Work, Education, Government and the API are excluded. [P] Researched Oct 6, 2026, not yet confirmed by a person, recheck by Dec 15, 2026.
- Anthropic. Anthropic's usage policy, effective 2025-09-15, requires a qualified human reviewer and disclosure of AI use for housing, legal and financial decisions. [P] Researched Oct 6, 2026, not yet confirmed by a person, recheck by Dec 15, 2026.
- OpenAI. OpenAI's consumer plans train on chats unless the Improve the model setting is turned off, and a Temporary Chat is not used for training; Enterprise, Business, Edu and API data are not used by default. [S] Researched Oct 6, 2026, not yet confirmed by a person, recheck by Dec 15, 2026.
- Google Gemini. Google Gemini Apps keeps activity 18 months by default, keeps human-reviewed chats up to three years, and tells users not to enter confidential information. [P] Researched Oct 6, 2026, not yet confirmed by a person, recheck by Dec 15, 2026.
- Microsoft Copilot. Microsoft Copilot on a personal account may use chats to train models unless the user opts out; Entra and Microsoft 365 work accounts are excluded. [S] Researched Oct 6, 2026, not yet confirmed by a person, recheck by Dec 15, 2026.
- Claude. Claude Team, Enterprise and API inputs and outputs are not used for training by default; a BAA is available only on Enterprise and the first-party API after admin action. Researched Oct 6, 2026, not yet confirmed by a person, recheck by Dec 15, 2026.
- Claude. Claude Free, Pro and Max inputs can be used for training if the user allows model improvement, with retention up to five years if allowed and 30-day deletion otherwise (pages dated 2026-03-16 and 2026-07-01). Researched Oct 6, 2026, not yet confirmed by a person, recheck by Dec 15, 2026.
- OpenAI. OpenAI API inputs are not used for training by default; abuse-monitoring logs are kept up to 30 days; zero data retention is available by approval. Researched Oct 6, 2026, not yet confirmed by a person, recheck by Dec 15, 2026.
- OpenAI. OpenAI Business, Enterprise and Edu no-training defaults are reported by secondary sources only; the vendor trust pages returned 403 on the check date. Read the vendor page yourself. Researched Oct 6, 2026, not yet confirmed by a person, recheck by Dec 15, 2026.
- Microsoft. Microsoft Copilot and Copilot Chat with Enterprise Data Protection: prompts and responses are not used to train foundation models, the DPA applies, and Microsoft acts as processor (Learn page updated 2026-08-18). Researched Oct 6, 2026, not yet confirmed by a person, recheck by Dec 15, 2026.
- Google. Gemini in Google Workspace content is not human-reviewed or used for training outside the customer's domain; default retention is 18 months. Researched Oct 6, 2026, not yet confirmed by a person, recheck by Dec 15, 2026.
Every area gives away its first moves free. Each track spins endless personalized lessons.