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MyCostBase Docs

Practical docs for setting up taxable accounts, importing history, reviewing pooled ACB, and preparing year-end reports.

MyCostBase is a tax-first adjusted cost base ledger for Canadian taxable accounts. These docs focus on the steps that matter at launch: setting up the taxable pool correctly, importing and reviewing history, understanding the core calculations, and exporting the year-end information you need.

Start here

If you are new to the product, begin with Getting Started. That page covers the setup decisions that change the legal ACB pool, including which accounts belong in scope and why registered accounts must stay outside it.

Core workflows

The initial docs set is organized around the main Phase 1 workflow:

What MyCostBase does not do

MyCostBase does not replace tax filing software and it does not try to be a full portfolio analytics platform. Phase 1 is focused on adjusted cost base, capital gains reporting, and the review trail behind those numbers.

If you are looking for unsupported areas such as options, crypto, direct brokerage API sync, or advanced corporate actions, treat those as out of scope for the launch product.

Getting Started

Define the taxable account universe correctly before you import a single transaction.

Importing Transactions

Use broker CSVs or manual entry without losing the warnings that matter for ACB accuracy.

Pooled ACB Across Brokerages

Understand why one security held at multiple brokerages still belongs to one ACB pool.

USD and FX Conversion

Understand how MyCostBase applies date-based FX conversion to foreign-currency trades.

ETF Adjustments

Record ETF-specific events that brokers often ignore when showing book value.

Reconciliation and Reports

Use MyCostBase to explain why broker numbers and T5008 values diverge from the real ledger.