Nine TFSA mistakes, and how to avoid them in 2026

How TFSA room works

Everyone resident in Canada with a valid social insurance number earns TFSA room each year from the year they turn 18. Unused room carries forward with no time limit. The yearly limits have been $5,000 (2009 to 2012), $5,500 (2013 and 2014), $10,000 (2015), $5,500 (2016 to 2018), $6,000 (2019 to 2022), $6,500 (2023) and $7,000 (2024 to 2026), which adds up to $109,000 for someone who was 18 and resident in 2009 and has never contributed.

Investment growth and losses inside the account don't change your room. Contributions are counted when they go in, whatever happens to the money afterwards.

The nine mistakes

1. Putting a withdrawal back in the same year

This is one of the most common TFSA mistakes. A withdrawal is added back to your room on January 1 of the following year, not on the day you take it out. If your account is full and you take out $10,000 in March and put it back in June, the $10,000 in June is an over-contribution until January.

2. Losing track of your room

Your room is shown in your CRA account, but it relies on what financial institutions report, and they report each year's transactions by the end of February of the next year. Room shown in the spring can be out of date if you contributed recently, and having accounts at several institutions makes it easy to double-count. Keep your own running total and check it against the CRA's figure; the CRA says the previous year's records are processed by April.

To see your room, sign in to your CRA account, choose your individual account, then Savings and pension plans, View TFSA details and Contribution room. The same screen has a calculator that uses your own records for this year's contributions; CRA explains both on Calculate your TFSA contribution room, and the paper alternative is the RC343 worksheet.

3. Over-contributing and leaving it

Any excess amount is taxed at 1% for each month it stays in the account, and a deliberate over-contribution can bring further tax. Withdraw it as soon as you notice; don't wait for a letter. You still have to file a TFSA Return (Form RC243) by June 30 of the following year. If it was a reasonable error and you fixed it quickly, you can ask the CRA in writing to waive or cancel the tax.

4. Trading so often it becomes a business

Buying and selling investments inside a TFSA is allowed. But if the activity amounts to carrying on a business, the CRA can tax the income earned in the account as business income; its TFSA page warns that holders who invest with the frequency and experience of a professional trader may have their income taxed as a business. The CRA looks at the same things it would outside a TFSA: how often you trade, how long you hold, whether you borrow, your knowledge and experience, and how much of your time it takes. Day trading in a TFSA is the classic case.

5. Holding something the TFSA can't hold

Most publicly traded shares, ETFs, mutual funds, bonds, GICs and cash are qualified investments. Anything not on the CRA's list of qualified investments is non-qualified, and some investments are prohibited because they are closely connected to you, such as shares of a company in which you have a significant interest (generally 10% or more). Holding a non-qualified or prohibited investment brings a special tax, reported on the TFSA Return. If you are offered something unusual for your TFSA, check before you buy.

6. Expecting US dividends to be tax-free

Income in a TFSA is not taxed in Canada, but other countries don't have to agree. The United States generally withholds tax on dividends paid to a TFSA, and because nothing from the TFSA goes on your Canadian return, that tax can't be recovered or claimed as a foreign tax credit. The tax treaty generally exempts RRSPs, which is why some investors hold US dividend payers in an RRSP and Canadian or growth investments in a TFSA. How that applies to your mix of investments is a question for a licensed advisor.

7. Contributing after you move abroad

If you become a non-resident of Canada, you can keep your TFSA, income in it isn't taxed in Canada (your new country may tax it), and you can withdraw without Canadian tax. But you earn no new room for any full calendar year you are a non-resident, and any contribution you make while non-resident is taxed at 1% a month until you withdraw it or become resident again, on top of any excess-amount tax. Withdrawals made while you're away come back as room only once you're a resident again.

8. No successor holder or the wrong beneficiary

Only a spouse or common-law partner can be named a successor holder. They take over the account as their own when you die, it stays tax-free, and their own contribution room isn't affected. Anyone else is a designated beneficiary: they receive the value at the date of death tax-free, but income and growth after the death can be taxable to them, and a spouse named only as beneficiary has fewer options. If no one is named, the TFSA goes to your estate and can be part of the probate process. Check the designation on every TFSA, especially after a marriage or separation; the estate planning guide has more on beneficiary designations.

9. Treating it as a savings account only, or ignoring it

Despite the name, a TFSA can hold investments, and all growth is tax-free, whether it's interest, dividends or capital gains. Cash and GICs suit short-term goals and an emergency fund; money you won't need for many years is usually discussed with a licensed advisor in terms of your goals and comfort with risk. The other version of this mistake is never opening one: room keeps accumulating, but unused room earns nothing. Whether the TFSA or the RRSP comes first depends on your income now and later; see RRSP or TFSA and the RRSP tax savings calculator. To see what you take home each month before deciding how much to save, try the pay and tax dashboard.

This guide is general information, checked against the CRA's TFSA pages on 2 Nov 2026. Rules have exceptions and can change; it isn't tax or investment advice for your situation.