The OAS clawback

Fifteen percent does not sound like much until you notice where it sits: directly on top of a marginal rate that is already in the forties. And unlike a bracket, this one you can often step around.

The arithmetic

Because it is charged on income you already pay tax on, the two stack. Someone in a forty-something percent bracket inside the recovery range faces an effective marginal rate in the high fifties on every additional dollar. That is a higher rate than the top bracket applies to a very high earner.

The recovery is tested per person, not per household. Two spouses each below the threshold keep both benefits in full; the same household income concentrated in one person can lose a meaningful share of one. That asymmetry is exactly what pension splitting exists to address.

What actually pushes people over

Mandatory withdrawals from a large registered balance — the most common cause, and the one nobody chose in the year it happens.
A defined benefit pension plus CPP plus OAS, which for a long-service employee can approach the threshold before any savings are touched.
A one-off event: selling a rental property, realising a large capital gain, or collapsing an account in a single year.
The death of a spouse, which moves a household from two returns to one and can push the survivor over a threshold their combined income never crossed.

The same household, clawed back or not

Dan & Marie — 58 and 56, Alberta. Dan retires at 62 with a defined-benefit pension; Marie retires at 60. Their RRSPs are very different sizes, which matters later.

Dan and Marie’s plan is close enough to the threshold that the drawdown order decides the outcome. Drawing tax-free accounts first, their lifetime OAS recovery is $0. Drawing registered accounts down first, it is $6,816. A deliberate meltdown at a fixed rate lands in between at $2,726.

Dan and Marie’s lifetime OAS recovery is $0 drawing tax-free accounts first, $2,726 under a fixed-rate meltdown and $6,816 drawing registered accounts first — the clawback is produced by the withdrawal choice, not by their wealth. — Identical household and identical spending. The recovery tax is a consequence of the order.

Under the fixed-rate meltdown their household gross income at 72 reaches $131,066, which is what puts one of them into the recovery range. Worth noting the previous two episodes: the registered-first order that triggers the most clawback here is also the one that leaves them the most money. The clawback is a cost of that strategy, not a verdict on it.

What reduces it

Anything that lowers net income in the years OAS is being paid: TFSA withdrawals, which are invisible to the test; drawing a registered balance down before OAS starts, so the mandatory withdrawals later are smaller; splitting eligible pension income with a spouse; and spreading a large one-off realisation across more than one tax year where that is possible.

One timing detail catches people. The recovery is assessed on the prior year’s income and then collected by reducing the following year’s monthly payments. A single large income year therefore shows up as reduced OAS a year later, which can be confusing if the income that caused it has already passed and the income in the year of reduction is back to normal.

The projection reports gross and net OAS separately every year, so any recovery appears as the gap between them — and clicking the year shows exactly which income caused it.

See whether your plan trips it, and when

Next: the clawback that is three times harsher, and hits people with far less money.

GlidePathEngine is an educational planning tool — not financial, investment, tax, or legal advice.