Canadian Adjusted Cost Base Checklist for Taxable Investors

A practical pre-tax-filing checklist for Canadian investors to verify adjusted cost base, T5008 slips, ETF return of capital, USD trades, DRIPs, transfer-in cost basis, and multi-broker holdings before completing Schedule 3.

If you hold stocks, ETFs, mutual funds, or other securities in a Canadian taxable account, your adjusted cost base is not something you should leave until the day you file your tax return. Your broker may provide a book value. Your T5008 slip may include a cost or book value. Your tax software may import the slip automatically. None of that guarantees your capital gain or loss is correct.

Adjusted cost base is your record. It follows the security across taxable accounts, broker transfers, reinvested distributions, return-of-capital adjustments, foreign exchange conversions, and partial sales. This checklist is designed to help you review those records before filing.

Use it before you complete Schedule 3, before you send your documents to a tax preparer, or before you rely on the numbers imported from a brokerage tax slip.

This guide is for general educational purposes only. It is not tax, legal, or financial advice. If your situation involves multi-leg options strategies (spreads, straddles, collars), short sales, corporate reorganizations, estate transfers, superficial losses, business income treatment, or other complex transactions, speak with a qualified tax professional.

Free downloads

Two CSV templates — no signup required.

• ACB ledger CSV — 30-column structured file for pooled multi-broker tracking with T5008 reconciliation, FX conversion, DRIP, and ROC fields. Open in Excel or Google Sheets.
• Simple ACB tracker CSV — 7-column template for single-account portfolios with straightforward buy, sell, and DRIP records.

The T5008 reconciliation worksheet and pre-filing review worksheet are formatted for print within this page.

Who should use this checklist?

Use this checklist if any of the following apply:

• You sold stocks, ETFs, mutual funds, or other securities in a non-registered account.
• You received one or more T5008 slips.
• You hold the same security at more than one brokerage.
• You transferred positions from one brokerage to another.
• You hold Canadian ETFs or mutual funds that report return of capital.
• You participate in a dividend reinvestment plan.
• You bought or sold U.S.-listed securities in a taxable account.
• You rely on broker book value but have not verified it against your own ledger.
• You are preparing Schedule 3 for capital gains or losses.

You may not need a detailed ACB review for every account. Registered accounts such as TFSAs, RRSPs, RRIFs, RESPs, and FHSAs generally do not require ACB tracking for annual capital gains reporting. This checklist is focused on taxable, non-registered investment accounts.

1. What records to collect before tax season

Before calculating capital gains, collect the source documents. Do not start with the T5008 alone. The T5008 is useful, but it is not a complete ACB ledger.

Collect these documents

For each taxable brokerage account, gather:

• Annual trading summary
• Monthly or quarterly statements
• Trade confirmations for buys and sells
• T5008 slips
• T3 slips for ETFs, mutual funds, and trusts
• T5 slips, where applicable
• Account transfer documents
• DRIP confirmations or reinvestment records
• Corporate action notices
• Stock split or consolidation notices
• Return-of-capital details from ETF or fund providers
• Prior-year ACB ledger or spreadsheet
• Prior-year Schedule 3 records
• Notes from your tax preparer, if any

For each security, confirm you have:

• Full security name
• Ticker symbol
• CUSIP or ISIN, if available
• Account ownership
• Brokerage account
• Currency
• Complete buy history
• Complete sell history
• DRIP transactions
• Return-of-capital adjustments
• Reinvested capital gains distributions
• Transfers in or out
• Current share balance
• Total ACB
• ACB per share

Important record-keeping rule

Do not rebuild ACB only from the year you sold. ACB depends on the full history of the position. If you bought shares in 2018, transferred them in 2021, received DRIPs from 2022 to 2025, and sold in 2026, your 2026 gain depends on all of those earlier events.

A clean ACB file should answer this question:

For every sale during the year, what was the pooled ACB per share immediately before the sale?

If you cannot answer that, do not file based only on the broker’s book value without reviewing the difference.

CRA generally requires you to keep the records supporting your ACB calculation for six years from the end of the last tax year they relate to, and indefinitely for records supporting a carried-forward capital loss (CRA guidance on keeping records).

2. T5008 Box 20 / Box 21 reconciliation checklist

Your T5008 reports securities transactions to you and to CRA. It is one of the most important documents to review, but it is also one of the easiest documents to misuse. According to the CRA’s T5008 slip guide, Box 20 reflects the cost or book value as reported by your broker, which may differ from your true adjusted cost base.

The boxes to verify

On a T5008:

• Box 20 is cost or book value.
• Box 21 is proceeds of disposition or settlement amount.

Do not reverse these boxes.

Box 21 is the sale proceeds reported by the broker. Box 20 is the broker’s cost or book value. Box 20 may be blank, zero, incomplete, or different from your actual adjusted cost base.

Why Box 20 may not match your ACB

T5008 Box 20 can differ from your correct ACB because the broker may not have all the information needed to calculate your full cost base. Common reasons include:

• You bought the same security at another brokerage.
• You transferred the position from another broker.
• The receiving broker recorded the transfer at market value instead of original cost.
• You had DRIP reinvestments that were not fully included.
• You held ETFs with return-of-capital adjustments.
• You had reinvested capital gains distributions.
• You paid commissions that were treated differently.
• You traded in USD and need CAD conversions by transaction date.
• Your broker tracks book value per account, while your taxable ACB may need to be pooled across accounts under the same ownership.

T5008 reconciliation steps

For each T5008 line:

1. Match the T5008 security to your ledger.
2. Confirm the sale date.
3. Confirm the quantity sold.
4. Confirm the proceeds in Box 21.
5. Calculate your ACB per share immediately before the sale.
6. Multiply your ACB per share by the number of shares sold.
7. Compare that amount to Box 20.
8. Record the difference.
9. Document the likely reason for the difference.
10. Use the amount supported by your own ACB records when completing your capital gain calculation.

Simple reconciliation table

Use this structure for each sale:

Use the free T5008 ACB Reconciliation Checker to compare Box 20 against your own ACB records for a single disposition.

3. ETF ROC and reinvested distribution checklist

ETF and mutual fund investors need extra care. ACB is not affected only by buys and sells. Annual tax allocations can change your cost base even when you do not trade.

The most common overlooked items are:

• Return of capital
• Reinvested distributions
• Reinvested capital gains distributions
• Phantom distributions
• Non-cash taxable allocations

Return of capital

Return of capital generally reduces your adjusted cost base. For Canadian ETFs and mutual fund trusts, return of capital is commonly reported on a T3 slip in Box 42, per CRA’s guidance on the tax treatment of mutual funds.

A positive Box 42 amount generally reduces ACB. A negative amount may increase ACB. If return of capital reduces ACB below zero, the negative amount may create a capital gain and reset the ACB to zero.

Do not ignore Box 42 because no shares were sold. ROC affects the eventual capital gain when you sell.

Reinvested distributions and phantom income

Some ETFs and mutual funds report taxable distributions that are reinvested or retained by the fund. You may owe tax on the income even though you did not receive cash. For ACB purposes, these amounts may increase your cost base.

This matters because if you pay tax on a reinvested distribution but fail to increase your ACB, you may be taxed again later through a larger capital gain.

ETF review checklist

For each ETF or mutual fund held in a taxable account:

• Confirm whether you received a T3 slip.
• Check whether Box 42 has an amount.
• Review the fund provider’s annual tax breakdown.
• Identify return-of-capital amounts.
• Identify reinvested capital gains distributions.
• Confirm whether any non-cash distributions affect ACB.
• Apply the adjustment to the correct security.
• Apply the adjustment to the correct tax year.
• Keep the supporting T3 slip and provider document.
• Confirm the adjusted year-end ACB per share.

Example: ROC adjustment

You hold 500 units of a Canadian ETF.

At year-end:

• Total ACB before adjustment: $12,000
• T3 Box 42 return of capital: $150
• Units held: 500

ACB after ROC: $12,000 − $150 = $11,850

New ACB per unit: $11,850 ÷ 500 = $23.70

The share count did not change. The total ACB changed.

For a deeper explanation, see ETF Return of Capital and Adjusted Cost Base.

4. USD trade FX checklist

Canadian taxpayers report capital gains and losses in Canadian dollars. If you buy or sell U.S.-listed securities in a taxable account, you need CAD amounts for both cost and proceeds.

Do not calculate gain in USD and convert only the final gain. Convert the purchase cost and sale proceeds separately using the appropriate exchange rate for each transaction date.

For each USD buy

Record:

• Trade date
• Settlement date, if used in your records
• Security
• Quantity
• USD price
• USD commission
• Gross USD cost
• FX rate used
• CAD equivalent cost
• Source of FX rate
• Total ACB after the trade
• ACB per share in CAD

For each USD sell

Record:

• Trade date
• Security
• Quantity sold
• USD sale price
• USD commission
• Gross USD proceeds
• Net USD proceeds
• FX rate used
• CAD equivalent proceeds
• CAD ACB for shares sold
• CAD gain or loss

Common USD ACB mistakes

Avoid these errors:

• Using today’s FX rate for historical trades.
• Using one blended annual average for all purchases and sales.
• Calculating the gain in USD and converting only the net result.
• Ignoring USD commissions.
• Using broker FX conversions without documenting the rate.
• Mixing CAD and USD values in the same ACB column.
• Forgetting that the ACB ledger should be maintained in CAD for Canadian tax reporting.

Example: USD trade

Buy: 100 shares at $50 USD, commission $1 USD, FX rate 1.3500 CAD/USD

CAD cost: ($5,000 + $1) × 1.3500 = $6,751.35 CAD

Sell: 100 shares at $70 USD, commission $1 USD, FX rate 1.3000 CAD/USD

CAD proceeds: ($7,000 − $1) × 1.3000 = $9,098.70 CAD

Capital gain: $9,098.70 − $6,751.35 = $2,347.35 CAD

The USD gain is not the number you report. The CAD gain is.

Use the free USD to CAD Capital Gains Calculator for a single U.S. stock trade.

5. Multi-broker pooling warning

One of the most common ACB errors in Canada happens when investors use one cost base per brokerage account.

For taxable accounts, identical securities held under the same ownership generally need one pooled ACB - the averaging rule comes from the Income Tax Act’s identical property provisions, section 47. If you hold the same ETF at Wealthsimple and Questrade in taxable accounts, you do not have two separate ACBs for tax reporting. You have one pooled ACB for that security.

Example

You buy the same ETF at two brokerages:

• Brokerage A: 100 shares at $20
• Brokerage B: 100 shares at $30

Your pooled ACB:

• Total cost: $2,000 + $3,000 = $5,000
• Total shares: 200
• Pooled ACB per share: $25

If you sell 50 shares at Brokerage A, you do not use Brokerage A’s $20 cost. You use the pooled $25 ACB per share.

Multi-broker review checklist

For each security sold during the year:

• Search all taxable accounts for the same ticker.
• Confirm whether the same security is held at another broker.
• Confirm whether the holdings are under the same tax owner.
• Combine all taxable holdings under the same ownership into one ACB pool.
• Calculate the pooled ACB per share before the sale.
• Use the pooled ACB for the sale, regardless of which broker executed the sale.
• Keep a note explaining the pooled calculation.

Watch ownership differences

Do not automatically pool everything together. Ownership matters.

Separate review may be needed for:

• Individual taxable accounts
• Joint taxable accounts
• Corporate accounts
• Trust accounts
• Spouse or common-law partner accounts
• Registered accounts

Registered accounts generally do not belong in the taxable ACB pool for Schedule 3 reporting, but transactions involving registered accounts can create other tax issues in some cases. Get tax advice if you are moving securities between taxable and registered accounts.

See Pooled ACB Across Multiple Brokerages for a detailed walkthrough.

6. Transfer-in cost basis warning

Broker transfers are dangerous for ACB tracking because the receiving broker may not know your original cost.

If you transfer shares from one taxable brokerage to another, the new broker may display a book value based on market value at the transfer date, missing data from the old broker, or a value manually supplied during the transfer. That value may not be your true adjusted cost base.

A transfer between taxable brokerages does not automatically reset your ACB.

Transfer-in checklist

For every transferred position:

• Identify the original acquisition date.
• Find the original trade confirmation or statement.
• Record the original cost.
• Include original commissions.
• Confirm all purchases before the transfer.
• Confirm all sales before the transfer.
• Confirm all DRIPs before the transfer.
• Confirm all return-of-capital adjustments before the transfer.
• Confirm all stock splits or consolidations before the transfer.
• Record the share quantity transferred.
• Record the ACB per share at transfer date.
• Compare this with the receiving broker’s book value.
• Document any difference.

What to avoid

Do not assume:

• The receiving broker’s book value is correct.
• Market value on transfer date becomes your new ACB.
• A transfer document contains all historical ACB adjustments.
• Old records are unnecessary after the transfer completes.

Keep old brokerage statements. If you later sell the transferred position, the gain may depend on records from years before the transfer.

Transfer-in note for your ledger

Use a note like this:

Transferred in from [previous broker] on [date]. ACB carried forward from original purchase records and prior adjustments. Receiving broker book value not used as tax ACB.

7. DRIP tracking checklist

Dividend reinvestment plans create small purchases that are easy to miss. Each DRIP transaction can affect ACB.

A DRIP is not just a dividend. For ACB purposes, the reinvested amount usually acts like a purchase of additional shares or units. Your share count increases, your total ACB increases, and your ACB per share is recalculated.

DRIP checklist

For each DRIP transaction, record:

• Payment date
• Security
• Dividend or distribution amount
• Number of shares or units acquired
• Reinvestment price
• Fractional shares, if applicable
• Cash in lieu, if any
• Tax slip reporting
• Total share count after reinvestment
• Total ACB after reinvestment
• ACB per share after reinvestment

Common DRIP mistakes

Avoid these errors:

• Recording dividend income but not the reinvested share purchase.
• Entering only whole shares and ignoring fractional shares.
• Ignoring small DRIPs because the amount is minor.
• Missing DRIPs that happened before a broker transfer.
• Treating DRIPs and return of capital as the same thing.
• Failing to reconcile DRIP share counts against year-end statements.

Example: DRIP adjustment

Before DRIP: 100 shares, total ACB $4,000, ACB per share $40.00

DRIP: Reinvested distribution $120, new shares acquired 3.

After DRIP: 103 shares, total ACB $4,120, ACB per share $40.00

In this example, the ACB per share happens to remain the same because the reinvestment price equals the previous ACB per share. In real portfolios, the ACB per share usually changes.

See DRIP and Adjusted Cost Base in Canada for a full walkthrough.

8. Sample ACB ledger columns

A useful ACB ledger should be more than a list of buys and sells. It should preserve enough information to explain the calculation later.

Use these columns as a starting point.

You may not need every column for a simple portfolio. But if you have ETF distributions, USD trades, transfers, and more than one brokerage, extra columns reduce confusion later.

For simple portfolios, the free ACB Spreadsheet Template provides a ready-to-use version of this structure.

9. Downloadable CSV template

Use this CSV structure as a starting point for your ACB records.

CSV header:

1

tax_owner,account_type,brokerage,account_nickname,trade_date,settlement_date,security_name,ticker,cusip_isin,currency,transaction_type,quantity,price,commission,gross_amount,net_amount,fx_rate,cad_cost,cad_proceeds,acb_adjustment,shares_after,total_acb_after,acb_per_share_after,t5008_box_20,t5008_box_21,reconciliation_difference,source_document,notes,reviewed,review_date

Sample rows:

1
2
3
4
5

John Smith,Taxable,Questrade,Main taxable,2026-01-15,2026-01-17,Royal Bank of Canada,RY.TO,,CAD,Buy,100,132.00,9.95,13200.00,13209.95,1.0000,13209.95,,0.00,100,13209.95,132.0995,,,,Trade confirmation,Initial purchase,No,
John Smith,Taxable,Wealthsimple,Secondary taxable,2026-02-10,2026-02-12,Royal Bank of Canada,RY.TO,,CAD,Buy,50,128.00,0.00,6400.00,6400.00,1.0000,6400.00,,0.00,150,19609.95,130.7330,,,,Monthly statement,Pooled with Questrade holding,No,
John Smith,Taxable,Questrade,Main taxable,2026-06-30,2026-07-02,Royal Bank of Canada,RY.TO,,CAD,Sell,-60,140.00,9.95,8400.00,8390.05,1.0000,,8390.05,0.00,90,11765.97,130.7330,7800.00,8390.05,-43.98,T5008 and ledger,Used pooled ACB — broker book value differs from ledger,Yes,2027-03-15
John Smith,Taxable,IBKR,USD taxable,2026-03-01,2026-03-03,Apple Inc.,AAPL,,USD,Buy,25,180.00,1.00,4500.00,4501.00,1.3500,6076.35,,0.00,25,6076.35,243.0540,,,,Trade confirmation,USD cost converted to CAD at trade-date FX rate,No,
John Smith,Taxable,Questrade,Main taxable,2026-12-31,2026-12-31,Sample Canadian ETF,XABC.TO,,CAD,ROC,0,0.00,0.00,0.00,0.00,1.0000,,,-75.00,500,11925.00,23.8500,,,,T3 Box 42,Return of capital reduces ACB — no shares exchanged,Yes,2027-03-15

Template notes:

• Use positive quantities for buys and DRIPs.
• Use negative quantities for sells.
• Use zero quantity for ROC adjustments that change ACB but not share count.
• Keep CAD ACB fields separate from USD trade values.
• Keep the source document name in the file.
• Do not delete historical rows after a sale. The sale calculation depends on the prior running balance.

10. Sample “ACB review before filing” worksheet

Use this worksheet before filing your return or before sending records to a tax preparer.

Tax year:

Tax owner:

Reviewed by:

Review date:

Brokerages included: Brokerage 1 / Brokerage 2 / Brokerage 3

Registered accounts excluded from Schedule 3 ACB pool: TFSA / RRSP / RRIF / RESP / FHSA

Step 1: Document collection

Step 2: Security-level review

Step 3: Sale-level review

Step 4: T5008 reconciliation

Common reason codes:

• DRIP not included by broker
• ROC not applied by broker
• Transfer-in book value issue
• Multi-broker pooling
• USD FX difference
• Commission treatment
• Missing historical transaction
• Corporate action
• Unknown — needs review

Step 5: Final filing notes

Before filing, confirm:

• Every T5008 sale has been matched to your ledger.
• Every sale has a calculated ACB.
• Every ETF with Box 42 has been reviewed.
• Every USD trade has CAD values.
• Every multi-broker holding has been pooled correctly.
• Every transferred position uses original cost history, not just receiving broker book value.
• Every DRIP has been entered as a reinvestment.
• Every unresolved difference has a note.
• The final Schedule 3 amounts can be traced back to the ledger.

Reviewer certification:

I reviewed the ACB records for the securities sold during the tax year and documented the major differences between broker-reported figures and the ACB ledger.

Name:                    Date:

11. Want a cleaner way to maintain this ledger?

You can track ACB manually with the checklist and CSV template above. That is enough for a simple portfolio with one taxable account, a small number of Canadian stocks, and no ETF tax adjustments.

Manual tracking becomes harder when your portfolio includes:

• More than one taxable brokerage
• ETFs with return-of-capital adjustments
• DRIP reinvestments
• USD-listed stocks
• Transfers between brokers
• Multi-year positions
• T5008 discrepancies
• A large number of transactions

myCostBase is built for Canadian investors who need a reviewable adjusted cost base ledger across taxable accounts.

With myCostBase, you can:

• Track buys, sells, DRIPs, ROC, splits, and adjustments
• Pool identical securities across taxable brokerages
• Keep a running ACB per share
• Review T5008 Box 20 against your own records
• Track USD trades in CAD
• Keep notes and source records for review
• Export records for tax season or your tax preparer

Manual entry is free, so you can start by entering one security and comparing the result to your current spreadsheet or broker book value.

Frequently asked questions

Is T5008 Box 20 the same as adjusted cost base?

Not always. Box 20 is the broker’s cost or book value. It may match your adjusted cost base in simple cases, but it can be wrong or incomplete if you have transfers, DRIPs, ETF return of capital, USD trades, or holdings across more than one taxable brokerage.

Which T5008 box is proceeds?

Box 21 is proceeds of disposition or settlement amount. Box 20 is cost or book value.

Do I need to track ACB for my TFSA or RRSP?

This checklist is focused on taxable, non-registered accounts. TFSAs, RRSPs, RRIFs, RESPs, and FHSAs generally do not require ACB tracking for annual capital gains reporting. Be careful when transferring securities between taxable and registered accounts, because those transfers may have separate tax consequences.

Does return of capital reduce ACB?

Yes, return of capital generally reduces ACB. For many Canadian ETFs and mutual fund trusts, return of capital is reported on T3 Box 42. You should apply the adjustment even if you did not sell the security during the year.

Do DRIPs affect adjusted cost base?

Yes. A DRIP generally adds to your ACB because the distribution is used to buy more shares or units. Record the reinvested amount, the number of shares acquired, and the resulting share balance.

Do I pool ACB across different brokerages?

For identical securities held in taxable accounts under the same ownership, you generally need one pooled ACB. Do not calculate one ACB per brokerage if the same investor owns the same security in multiple taxable accounts.

What should I do if my broker book value is different from my ledger?

Reconcile the difference. Identify whether it comes from DRIPs, ROC, transfers, USD FX, commissions, or multi-broker pooling. Keep your calculation and supporting documents. If the difference is material or unclear, ask a qualified tax professional before filing.

Can I use a spreadsheet?

Yes, for simple portfolios. A spreadsheet can work if you have one taxable account, a modest number of trades, no transfer history, no USD trades, and no ETF distribution adjustments. For more complex portfolios, a dedicated ACB ledger is safer and easier to review. The free ACB Spreadsheet Template is a good starting point.

References

• CRA: Calculating and Reporting Capital Gains and Losses
• CRA: T5008 Slip Guide
• CRA: Tax Treatment of Mutual Funds (T3 Box 42 / return of capital)
• CRA: Capital Gains Guide (T4037)
• Income Tax Act, section 47 — Identical Properties
• CRA: How Long to Keep Your Records