The TFSA Mistakes That Cost Canadians The Most
I have said it before and will say it again - the TFSA has the worst name in Canadian personal finance. It is not a savings account, and it is not reliably tax-free (although the latter applies only to some isolated cases). The name is just not fitting and so many mistakes stem out of taking the name at face value.
I have been using a TFSA since I was eligible, and I still had to sit down and re-read the rules properly when I started planning drawdown seriously. Some of what I found genuinely surprised me. Not the "recontribution timing" stuff everyone writes about (though we will cover that, because it is still the number one error by volume), but the edge cases - the ones where someone does something completely reasonable and ends up with a CRA assessment.
So this post is two things. The first half is the common mistakes, handled quickly. The second half is the stuff nobody warns you about. If you are not familiar with TFSAs, check out a post I wrote earlier that covers the basics.
And don’t worry - everyone makes at least one of these mistakes. The first TFSA I opened was used as a simple high yield savings account.
First, The Numbers You Need
The 2026 annual TFSA dollar limit is $7,000, unchanged from 2024 and 2025. If you turned 18 in or before 2009, have been a Canadian resident every year since, and have never contributed, your cumulative room at the start of 2026 is $109,000.
That $109,000 figure is the one that shows up in every headline, and it is also the one that causes the most trouble - because it applies to a very specific person, and most people are not that person. More on that shortly.
The Common Mistakes (Handled Quickly)
Putting the money back in the same year. This is still the biggest one by a mile. Withdrawals do not create room immediately. They get added back on January 1 of the following year. Withdraw $10,000 in March to cover a bathroom renovation, get a bonus in August, put it back, and if you were already maxed out you have just over-contributed by $10,000. The tax is 1% per month on the highest excess amount in the month, and it keeps running until you pull the money out.
At its peak this rule caught over 100,000 Canadians in a single year. It still catches tens of thousands.
Trusting the number in CRA My Account. The number shown is accurate as of January 1, and financial institutions do not have to report your prior-year transactions to CRA until the end of February. So the figure you are looking at in the spring may be stale by a year of activity. It is your responsibility to track this, not CRA's, and "the website told me I had room" is not a defence. So if you made any transactions after the number was posted, make sure you account for them.
Tracking each TFSA separately. You can open as many TFSAs as you want. There is no limit on the number of accounts. But there is one limit, and it is shared across all of them - your room is per person, not per account.
This gets dangerous when the accounts are at different institutions, because no single statement shows you the whole picture. Add a pre-authorized contribution you set up in 2019 and forgot about, and you have a slow-motion over-contribution running in the background that none of your banks will flag.
Moving institutions the wrong way. If you withdraw from your TFSA at Bank A and deposit into your TFSA at Bank B, CRA sees a withdrawal and a fresh contribution - not a transfer. Ask for a direct transfer. Pay the transfer fee if there is one. It is cheaper than the alternative.
Assuming a loss gives you room back. It does not. If you put in $20,000 and it drops to $12,000, you have not freed up $8,000 of room. The room only moves when money actually leaves the account. This works in the other direction too - if that $20,000 grows to $60,000 and you withdraw the whole thing, the full $60,000 comes back as room the following January. That is the single most underrated feature of the account, and most people never use it.
Treating it as a savings account. The name did this. If your TFSA has held a high-interest savings balance for fifteen years, the tax shelter has been doing almost nothing for you. Sheltering 3% interest is worth very little. Sheltering three decades of equity growth is worth a great deal. That was the very first mistake I made. I blame both the bank for pushing this and myself for doing 0 reading.
Assuming the bank will stop you. They will not. Banks have said publicly and repeatedly that they have no idea how much room any individual customer has. There is no guardrail. There is only your own tracking.
That is the standard list. Now the interesting part.
Mistake - Holding US Dividend Payers In Your TFSA
This one is invisible, which is why it persists.
The US withholds 15% on dividends paid to Canadian investors. In an RRSP, the Canada-US tax treaty exempts that withholding entirely. In a non-registered account, you pay it but recover it through the foreign tax credit when you file.
In a TFSA, you pay it and you cannot recover it. There is no Canadian tax owing on TFSA income, so there is no tax bill to credit the withholding against. The money is gone permanently.
The same is true of the FHSA and the RESP. Only the RRSP and RRIF get the treaty exemption.
It is not a huge number in any single year - on a 1.5% dividend yield it is roughly 0.225% of the position annually. But it compounds against you for as long as you hold the position, and it is entirely avoidable through asset location. If you hold US-listed dividend payers, the RRSP is the better home for them.
One wrinkle worth knowing: the RRSP exemption only works when the US payer can actually see the RRSP, which in practice means holding US-listed securities directly. A Canadian-listed ETF that holds US stocks does not get the same treatment, because the withholding happens one layer down. This is not TFSA-related but it is something that has caught me off guard. And before you ask - no, XGRO/VGRO are not tax efficient. You still pay the 15% but it happens invisibly. If you want to minimize taxation, split up XGRO/VGRO into US-listed and Canadian-listed securities.
Mistake - Trading Too Actively
You can hold stocks in a TFSA. You cannot run a trading business inside one.
This got tested in court (and this, which in full disclosure I used AI to summarize into a short readable document). An investment advisor turned about $15,000 of contributions into more than $617,000 over three years, mostly through speculative penny stocks held for short periods. Every security he held was a qualified investment - that was never the problem. The problem was that the Tax Court found the TFSA was carrying on a business, and business income earned inside a TFSA is taxable to the TFSA.
He argued that the exemption RRSPs get for business income on qualified investments should be read into the TFSA rules too, since the two regimes mirror each other. The Federal Court of Appeal disagreed and dismissed the appeal with costs in 2024. Parliament wrote the exemption into the RRSP rules and did not write it into the TFSA rules, and the courts were not willing to write it in for them.
There is no bright-line test for when this happens. CRA looks at frequency of transactions, how long you hold positions, your knowledge of securities markets, whether trading forms part of your ordinary business, and how much time you spend on it. A licensed advisor day trading penny stocks hits several of those. Someone buying an index ETF twice a month does not.
The short version - if you are spending hours a day researching and executing trades in your TFSA, and it looks like a job, CRA may eventually agree that it is one.
Mistake - A Stock In Your TFSA Gets Delisted
Here is one that feels genuinely unfair. You buy a stock listed on a designated exchange. Fully qualified, no issue. The company runs into trouble, gets delisted, and starts trading over-the-counter.
It is now a non-qualified investment in your TFSA. The tax is 50% of the fair market value at the time it became non-qualified. You can get a refund of that tax if you dispose of it, unless you knew or ought to have known it would become non-qualified.
So the sequence is - your investment collapses, and then you get a tax bill on top of the loss. This is the single best argument I know of for keeping speculative individual names out of a TFSA specifically. The account has no capacity to absorb a bad outcome - you cannot claim the capital loss, and now there is a penalty layer as well.
Mistake - Holding Shares Of A Company You Have A Significant Interest In
If you own 10% or more of a company, its shares are a prohibited investment for your TFSA.
The consequences stack. There is a 50% tax on the fair market value of the investment. And any income or capital gain generated by a prohibited investment is a "TFSA advantage," taxed at 100%.
Read that again. One hundred percent of the income!
This matters for anyone with a private corporation who has been told to "put the shares somewhere tax-efficient." It is also a live risk for people who hold small positions in private companies through their TFSA and then see their ownership percentage rise because someone else's shares got redeemed - CRA's own folio walks through exactly that scenario, and notes it may consider a waiver where the holder had no involvement in the decision.
May consider. Not will!
Mistake - Contributing A Losing Position In Kind
You have a stock in your non-registered account that is down. You have TFSA room. Transferring it in kind seems efficient - you get the position into the shelter, and surely you can claim the loss.
You cannot. A loss on the disposition of property to a TFSA is deemed to be nil.
And this is worse than an ordinary superficial loss. With a normal superficial loss, the denied amount gets added to the adjusted cost base of the repurchased shares, so you recover it eventually. Here, the repurchase happens inside a registered account where adjusted cost base has no tax meaning. The loss has nowhere to go. It is permanently destroyed.
If you want both the loss and the contribution, do it in two steps - sell in the non-registered account to realize the loss, wait 31 days before buying back inside the TFSA to avoid the superficial loss rule, and contribute the cash in the meantime.
The gain side works differently, of course. Transfer a winner in kind and you trigger the capital gain immediately, at full fair market value. No way around that one.
Mistake - Naming Your Spouse As Beneficiary Instead Of Successor Holder
These sound like the same thing. They are not, and the difference is worth real money.
A successor holder steps into your shoes. The account stays open, keeps its tax-free status, and continues as their TFSA. Their own contribution room is untouched. Only a spouse or common-law partner can be named successor holder.
A beneficiary receives the money. The account collapses. The value at the date of death passes tax-free - but growth between the date of death and the date the money actually comes out has historically been taxable income to the beneficiary, reported on a T4A.
Estates take months to settle. Markets move during those months. That is how a grieving spouse ends up with a surprise tax slip.
If your spouse was named beneficiary rather than successor holder, there is a repair mechanism - the survivor can make an "exempt contribution" to their own TFSA, which does not consume their contribution room. But it has to happen during the rollover period (ending December 31 of the year following the death), and Form RC240 has to be filed within 30 days of making the contribution. Thirty days, while settling an estate. That is a deadline people miss.
Two footnotes on this. First, if the deceased had an over-contribution sitting in their TFSA, the successor holder is treated as making that same excess contribution the month after the death - the problem transfers along with the account. Second, if you are in Quebec, beneficiary and successor holder designations generally only work for insurance-based products like segregated funds. For everything else it has to go through the will.
Mistake - Contributing While You Are A Non-Resident
You keep your TFSA when you leave Canada. You cannot add to it.
Contributions made while a non-resident get a 1% per month tax until they are withdrawn or you resume residency. And you do not accrue new room for any full calendar year you spend as a non-resident.
That last part is the one that catches returning Canadians. The $109,000 cumulative figure assumes continuous Canadian residency since 2009. Spend six years abroad and your actual number is materially lower. If you come home and contribute based on the headline figure, you have over-contributed.
Withdrawals made while you are away do get added back to your room - but only become usable once you re-establish Canadian residency.
And the destination country may not care that Canada calls this account tax-free. The US in particular does not recognize it. For a US citizen or green card holder living in Canada, TFSA income is taxable on a US return as it is earned, with FBAR reporting and potentially Form 3520 and 3520-A on top. There is no treaty relief the way there is for an RRSP.
For a lot of people leaving Canada permanently, closing the TFSA on the way out is the simpler answer.
Mistake - Maxing Your TFSA While Your Spouse's Sits Empty
This one is less of a penalty mistake and more of a missed-opportunity mistake.
Imagine one spouse earns most of the household income and has a maxed TFSA. The other spouse has $50,000 of unused room. The higher-income spouse cannot contribute $50,000 to their own TFSA. But they can generally give the other spouse money, and the other spouse can contribute it to their own TFSA using their own available room.
The normal attribution rules don't cause the TFSA investment income to be attributed back to the spouse who supplied the cash. If you manage finances as a household, TFSA room is worth looking at as a household resource even though the actual accounts and contribution limits remain individual.
Leaving one spouse's TFSA empty while the other starts investing in a taxable account may be unnecessarily expensive.
Mistake - Borrowing to Max the TFSA and Expecting a Tax Deduction
You can borrow money and put it into a TFSA. But that doesn't make it tax-efficient. Interest on money borrowed to contribute to a TFSA is generally not deductible.
That matters when someone compares borrowing at 6% with an investment that “should make 8%.” You aren't starting with a clean 2% spread. You are taking investment risk, paying non-deductible interest, and hoping the expected return shows up on your preferred schedule.
Personally, I would need a very compelling reason to borrow to fill TFSA room. Unused TFSA room carries forward. There is no TFSA police officer knocking on your door on December 31 demanding to know why you didn't max it.
Mistake - Thinking Dividends and Reinvestments Use More Room
I mentioned how room works with gains and losses but let’s call out dividends and reinvestments.
Let’s say you contribute $10,000. Your investments pay $400 in dividends (4% dividend! Not too bad.). Those dividends stay inside the TFSA and automatically buy more shares. You did not contribute another $400 but your investment earned $400.
Likewise, selling one ETF and buying another inside the TFSA does not use new contribution room. Contribution room is concerned with money or property going into the TFSA from outside the TFSA. What happens between investments already inside the account is a different matter. Otherwise a successful TFSA would eventually become impossible to manage.
Mistake - Only Thinking About the TFSA While You Are Working
The TFSA gets more interesting as you approach retirement and I have drawn attention to this in many previous posts. Let’s repeat some of it here with additional examples.
An RRSP gives you a tax deduction when money goes in, but withdrawals are taxable income. TFSA contributions give you no deduction, but withdrawals are tax-free and generally don't affect federal income-tested benefits such as OAS and GIS.
That flexibility becomes valuable when you are trying to control taxable retirement income to maximize government benefits and minimize taxes.
For example - you are recently retired and realize you need to replace your vehicle with a $20,000 one. A $20,000 RRSP withdrawal adds $20,000 to taxable income. However, a $20,000 TFSA withdrawal does not.
This is why I don't view the TFSA as simply the younger sibling of the RRSP. I see it as another tool to help you in retirement. The accounts do different jobs and having money in both accounts gives future-you more options.
The Mistake Of Not Using What The Account Is Actually Good For
Everything above is about avoiding damage or leaving money on the table (I guess also a form of avoiding damage).
TFSA withdrawals do not count as income. Not for tax, and not for income-tested benefits - not GST credit, not the Canada Child Benefit, not OAS, and critically, not GIS.
I went deep on this in the GIS post. If you are anywhere near GIS territory in retirement, a dollar pulled from a RRIF can cost you 50 cents of GIS on top of the tax you owe on it. The same dollar pulled from a TFSA costs you nothing. For a retiree with modest savings, that difference is not a rounding error - it is the whole plan.
Which means the TFSA is not just "the flexible account." It is the account that lets you control what your reported income looks like in retirement. That is a strategic asset, and it is worth protecting the room rather than treating the account as a place to park cash between purchases.
The Short Version
- Withdrawals only restore room on January 1 of the following year. Everything else about over-contribution flows from misunderstanding this.
- Track your own room. CRA's figure lags, and your bank has no idea what your limit is.
- Move institutions by direct transfer, never by withdrawing and redepositing.
- US dividend payers belong in an RRSP. The 15% withholding in a TFSA is permanent.
- Speculative individual names are a bad fit - you cannot claim the loss, and a delisting turns a bad investment into a taxable event.
- 10% or more ownership in a company makes those shares prohibited. The tax stack is brutal.
- Never contribute a losing position in kind. The loss is destroyed, not deferred.
- Name your spouse successor holder, not beneficiary. Different words, different outcomes.
- Stop contributing the day you become a non-resident, and recalculate your room if you come back.
- Max out your spouse’s account.
- Avoid borrowing to max out your TFSA unless there is a good reason to.
- Dividends and reinvestments do not typically affect your contribution room. What matters is what goes from outside the TFSA into the TFSA.
- Plan well on how to use your TFSA in retirement.
Let's go back to the start. The account is called a Tax-Free Savings Account, and both of those words have cost Canadians real money. It is not a savings account - treat it like one and you waste decades of the best tax shelter available to you. And it is not unconditionally tax-free - trade too hard, hold the wrong thing, cross a border, or die with the wrong box ticked, and the tax finds its way in.
Most of these mistakes are not about being bad with money. They are about a reasonable person doing a reasonable thing, on the assumption that the rules match the name.
They do not. Learn the rules once, set up your tracking, tick the right box on the beneficiary form, and then let the thing compound for thirty years while you think about something else.