The cleanest experiment on the shelf
Most fund comparisons are muddy. Different holdings, different weights, different sectors — you're never quite sure whether the performance gap came from the strategy or the stocks. Then there's this pair, which is about as close to a laboratory as retail investing gets.
ZEB is BMO's equal-weight Canadian bank fund: the Big Six, roughly equal slices, nothing else happening. ZWB is BMO's covered-call version: the same six banks, from the same fund family, with an option-writing overlay bolted on top. Same issuer, same underlying, one variable. Their returns correlate at about 0.97 — they are, statistically, the same thing wearing different equipment.
So whatever separates their results is the machine. Not sector drift, not stock picking, not manager skill. Just the cost and benefit of selling away part of the upside on six bank stocks, month after month, priced by a decade of live data. Anyone trying to decide whether a covered-call overlay is worth it can stop arguing in the abstract and read this scoreboard instead.
Figures below are as of early September 2026 and will drift; the structural relationship they illustrate won't.
The scoreboard
Start with what each fund pays, because that's what draws people to ZWB in the first place. ZEB's trailing yield runs somewhere around 2.7 to 2.9%. ZWB's has recently run in the 5%-plus range — call the gap roughly two and a half points of extra income, which on a $100,000 position is a couple of thousand dollars a year of additional cash. Real money, arriving monthly.
Now the part the yield column never shows. Over the past ten years, ZEB has returned roughly 17% annualized against about 13.2% for ZWB — a gap near 3.8 percentage points per year, compounding, for a decade. Measured from ZWB's early days back in 2011, the same pattern holds at a lower altitude: roughly 10.7% annualized for the plain fund against 8.3% for the covered one. And in the current year's bank rally, ZEB is again ahead by several points.
Put those two facts side by side, because together they're the entire post: ZWB paid you about 2.5 points more per year and cost you about 3.8 points of total return per year. You didn't buy income with that trade. You bought the shape of income, and paid roughly a point and a half a year for the privilege — every year, compounding, on top of the fee difference.
Why the gap exists (and it isn't manager error)
Nothing went wrong at BMO. The gap is the strategy working exactly as designed, and the mechanics are the ones we've laid out before: ZWB sells call options on a portion of its bank holdings, collecting premium up front in exchange for capping how much it participates when those stocks rise.
Canadian banks, over a ten-year window, rose a lot. Every strong month is a month where ZWB's upside was capped at the strikes while ZEB simply captured the whole move — and the premium collected was never going to match what a bank stock does in a genuinely good quarter. Repeat that across a decade of a sector that mostly went up, and a small monthly haircut compounds into a 3.8-point annual gap. That's not a flaw. That's the option market pricing the upside fairly and the fund selling it as instructed.
The fee widens it further, and the honest way to price a fee is against the income it buys: ZEB charges about 0.25% against its ~2.8% yield — roughly nine cents of every income dollar. ZWB charges about 0.72% against ~5.2% — roughly fourteen cents. Higher toll, though notice it's not scandalous; the overlay is the expensive part, not the management fee. Most of what you gave up, you gave up to the option market, not to BMO.
When ZWB wins
The honest counter-case, because it exists and it matters.
Covered-call structures win sideways and mildly-down markets — the premium keeps arriving while nothing runs away upward. In a flat year for banks, ZWB should beat ZEB, and in a modest decline it should fall slightly less. That's the environment the strategy is built for, and the ten-year scoreboard partly reflects the fact that Canadian banks spent most of that decade rising, which is the worst possible weather for the machine.
What ZWB does not provide is crash protection. Both funds fell roughly together in the sharp declines, because a covered call is not a hedge — the fund still owns every share on the way down, cushioned only by a percent or so of premium. And after the bottom, ZWB keeps selling calls into the recovery, capping its share of the snapback that repairs ZEB fully. Down together, back up slower.
There's also a genuine use case that the scoreboard can't grade: if you're spending the distributions now, ZWB's larger monthly cheque is doing a job ZEB doesn't do. Selling ZEB units by hand every month to manufacture the same cash flow is possible but fiddly, and for a retiree who values the automation and genuinely doesn't need maximum growth, paying a point and a half a year for it is a defensible choice made with open eyes. That's the trade. It's just a much smaller and more specific case than "high yield, same banks, obviously better."
The bank-specific wrinkle
One thing that makes this pair especially clarifying: the underlying assets here are the most reliable dividend payers in the country. The Big Six haven't cut since the 1940s and have historically grown their dividends at a healthy clip.
So ZEB's modest-looking 2.8% isn't a static 2.8%. It's a payout attached to six companies with strong records of raising it — the growth dimension no yield column shows — sitting on capital that compounded at 17% a year for a decade. ZWB's 5%-plus is larger today and structurally slower to grow, because every capped month is a month of foregone capital that would otherwise have carried future dividends with it. Extend the horizon far enough and the small-yield fund on the compounding machine can end up paying more per month than the big-yield fund on the converting one. That's the same arithmetic that made the VDY vs HDIV comparison so lopsided, running here on assets so nearly identical that nothing else can be blamed.
The verdict
If you're accumulating — reinvesting the distributions, years from spending them — ZEB is the answer, and the decade of data is about as unambiguous as this business gets. Paying an overlay to convert bank-stock growth into income you're only going to reinvest is the leak we keep describing, and here it's priced at nearly four points a year.
If you're spending the income now, ZWB is a legitimate purchase with a knowable price tag: about a point and a half of annual return, plus a higher fee toll, in exchange for roughly double the cash flow and no manual selling. Some people should take that deal.
What nobody should do is hold ZWB because 5% is a bigger number than 2.8%. Same six banks, same issuer, one difference — and that difference has now been measured over a decade in public. This is what our whole scoring approach is built to surface: two funds, one scale, the yield read last rather than first. You can see how both grade in the research directory, and the honest summary of ZWB is not that it's a bad fund. It's that it's a conversion device, priced fairly by an efficient option market, and the conversion is only worth buying if you actually need what it converts into.