Credit card churning is opening a credit card to earn its welcome bonus, spending whatever the bonus requires inside the time limit, then moving on to the next card.
I've been doing it with Canadian cards for years, and I keep running into the same thing when I talk to people about it: they've never heard the word. They've heard of collecting points. They've maybe got a card sitting in a drawer that earned them a flight once. But "churning" isn't a word most Canadians have, which makes it hard to look up, hard to ask about, and easy to get wrong.
What is credit card churning?
Churning is treating credit card welcome bonuses as the product, rather than treating the card as the product. You open a card for its bonus, meet the spending requirement inside the deadline, collect, then decide whether the card is worth keeping. The cycle repeats with a different card and a different bonus.
A bank offers you a large one-time bonus for opening a card and spending a certain amount on it within a few months. That bonus is usually worth far more than the card's ongoing rewards. So instead of picking one card and keeping it for a decade, a churner opens a card, earns the bonus, and then decides what to do with the card: keep it, downgrade it to a no-fee version, or close it before the next annual fee arrives.
Then they do it again with a different card.
The word comes from the churn of opening and closing, not from anything shady. Banks publish these offers on purpose. They're buying customers, and they've priced the bonus expecting most people to stay.
Is credit card churning legal in Canada?
Yes. There's no law against opening a credit card, meeting its terms, and closing it later. What limits you is not the law but each issuer's own eligibility rules, and breaking one costs you the bonus rather than getting you in trouble. The strictest of them in Canada is American Express.
What exists instead are the banks' own rules. Every credit card issuer sets conditions on who qualifies for a welcome bonus, and breaking one doesn't get you in trouble, it just means you don't get the bonus. Which is worse than it sounds, because you usually find out after you've done the spending.
The Canadian rule people trip on most is American Express. Amex Canada cards typically say you're ineligible for the welcome bonus if you have ever held that card product. Not "in the last two years". Ever. That makes each Amex bonus roughly a one-shot opportunity, and it's stricter than what American churners are used to. Other Canadian issuers are more forgiving and more varied: some want a gap of 12 or 24 months since you last held the product, some restrict holding two cards from the same family at once, some barely say anything.
The words you'll see
Six terms cover most of it.
The welcome bonus is the one-time reward for being a new cardholder. In Canada this is usually points or miles, sometimes cash back.
The spend target is what you have to put on the card to earn it. Commonly somewhere between $1,000 and $6,000 in Canada, depending on how rich the bonus is.
The spend window is how long you have to do it. And this is where a lot of Canadian offers stop being one number: plenty of them split the bonus in two. There's a short first target, usually three months and usually aggressive, and then a second, larger target stacked on top of it, usually running to twelve months and usually easy to reach if you keep using the card at all. Two amounts, two deadlines, one card. Miss the first and the second is usually still available to you, but the bonus attached to it is the smaller half: most of the value sat in the target you just missed.
The annual fee is what the card costs you each year. Many premium Canadian cards waive or rebate it for year one, which is what makes the timing matter: the fee that hurts is the second one, on a card you've stopped using and forgot to downgrade or cancel in time.
The cooldown is how long you have to wait before that same bonus is available to you again. This is the one that varies wildly by issuer, and the one people most often skip in the fine print and then fail to track.
Your daily driver is the card that isn't part of any of this: a long-held no-fee card that stays open permanently while the others come and go. It anchors your account history, and it covers the everyday purchases the card you're currently churning is bad at, whether that's a category where it pays a poor rate or one of the many Canadian merchants that still won't take Amex.
Put together, one churning cycle is a single pursuit: one card, one bonus, its spend targets, their deadlines, and a date by which you've decided whether to keep it, downgrade it, or cancel it.
Who is churning actually for?
Not everyone. Churning only pays when your ordinary spending already covers the card's target, because the moment you invent purchases to reach it, the bonus costs more than it returns. It also assumes you never carry a balance, since Canadian card interest runs around 20% or more.
Churning pays when your normal spending already reaches the spend target on its own. If you'd naturally put $3,000 through a card over three months, a $3,000 target is free money. If you'd naturally spend $1,200, then hitting that target means inventing $1,800 of purchases you didn't want, and now the bonus is costing you more than it pays. People do this. They buy things they don't need, or they prepay bills, or they go looking for ways to manufacture spending. That reaction is priced in. Issuers set these targets high enough that a good share of applicants have to stretch to reach them, and the stretching is where the offer stops being a giveaway and starts being a sale.
It also only works if you never carry a balance. Canadian card interest runs around 20% or more. One month of interest on a real balance wipes out a good chunk of a welcome bonus, and two months wipes out all of it. Churning assumes you pay in full, every time, without exception.
Churning suits people who already spend a predictable amount, already pay in full, aren't about to borrow money for something important, and don't mind keeping track of dates. If that's not you, the points aren't worth it, and anybody telling you otherwise is selling something.
Does credit card churning hurt your credit score?
Yes, a little, and usually not for long. Every application is a hard credit check, so your score drops a few points. It normally recovers within a few months, because you've added available credit and paid it on schedule. The one case where it matters: a mortgage application in the next year.
The useful detail is the timing. The dip lands the day you apply, and it is temporary. The recovery lands roughly when you finish the spend target a few months later, and it often leaves you slightly higher than you started.
The daily driver is what keeps the rest stable, which is most of why churners keep one. The applications still accumulate though, and if a mortgage is coming, this is a bad hobby to pick up right now.
The check to run before you apply
Almost everything written about churning tells you which cards to get. Far less of it tells you whether you'd hit the bonus on the spending you already do.
Take the card's spend target, divide by the length of the window, and compare that against what your statements say you spend in a normal month, not what you assume you spend. If the answer is comfortably under your normal spending, it's a real bonus. If it's above, you're about to pay for those points with purchases you'd never have made.
The same numbers answer a second question, and it's the one that decides which card to open rather than whether to open one. Canadian cards don't pay a flat rate. They pay accelerated points on particular categories, and the categories differ from card to card: restaurants on one, gas and transit on another, travel and drugstores on a third. So a card's real value to you isn't the headline multiplier, it's that multiplier applied to what you actually spend in those categories. Two people can look at the same card and one of them is holding a much better offer. Somebody who eats out four nights a week and takes transit gets almost nothing from an accelerated gas rate, and the person commuting an hour each way gets almost nothing from the restaurant one. Knowing what you put through each category in a normal month turns "5x on dining" from a slogan into a dollar figure.
That's why NBU exists in the shape it does: it puts each bonus you're chasing next to what you genuinely spend, category by category, so the answer comes from your own numbers instead of the offer's assumptions.
Where to go from here
If churning sounds like it fits, the next question is mechanical: how do you keep the dates and targets straight once you have more than one card running? I wrote that part up separately, with the system I built after my spreadsheet got out of hand. Between tracking two targets and a cancel-by date per card, and redoing the category math every time I looked at a new one, choosing the next card had turned into a part-time job: how to track credit card churning in Canada.