How a monthly pension budget changes when CPP and OAS start at different times

Most retirement budgets are drawn up as if the pensions all start together and stay put. In real households they often do not. One pension begins at 65, the other is deliberately postponed, and for a few years the monthly money comes from a different mix of sources than it will later. Those are the bridging years, and they look surprisingly different on paper from the years that follow.

This article lays out what changes in a monthly budget when the Canada Pension Plan and Old Age Security start at different ages. It does not suggest which order is better. That depends on health, savings, other income and personal preference, and it is a decision for each household, ideally with the official estimates in hand.

Two pensions, two separate clocks

CPP and OAS are different programs with different rules for starting late:

• CPP can start as early as 60 or as late as 70. Each month after 65 increases it by 0.7%, up to 42% at 70. Each month before 65 reduces it by 0.6%, down to 36% less at 60.
• OAS cannot start before 65. Each month of deferral after 65 increases it by 0.6%, up to 36% at 70. It is not based on work history but on years of residence in Canada after age 18; at least ten are required for people living in Canada.

For scale, the maximum OAS pension for October to December 2026 is $762.50 a month for people aged 65 to 74, and the Government of Canada gives $1,037.00 as the maximum monthly amount for someone who deferred to 70. Both CPP and OAS are adjusted for inflation, CPP once a year in January and OAS every three months, so the dollar figures below are in today's money.

What a bridging year actually is

If one pension is postponed, something else has to fill the space. For most households that is savings: RRSP or RRIF withdrawals, a TFSA, a workplace pension, or in some cases part-time earnings (see what part-time work does to a CPP pension). The bridging years therefore draw on savings faster than the later years will. That is not a flaw; it is the whole mechanism. The savings are spent earlier so that a larger, indexed, lifelong pension is received later.

One household, month by month

Here is an illustrative single retiree who stops work at 64. We assume that if she started CPP at 65 she would receive $1,000 a month, and that she qualifies for the full OAS amount. She chooses to start OAS at 65 and postpone CPP to 70. Spending is the same in both years so that only the income side moves.

The two months look almost identical at the bottom line, which is exactly the point of the plan. What differs is where the money comes from. At 66, nearly 70% of the month comes out of savings. At 71, about 88% comes from two indexed public pensions, and the savings account barely moves. The CPP figure at 71 is the assumed $1,000 increased by 42% for starting at 70.

The parts of the budget that move in the bridging years

Tax. RRSP withdrawals are fully taxable, and tax is withheld at source on lump sums: 10% on amounts up to $5,000, 20% from $5,000 to $15,000 and 30% above that, outside Quebec. The withholding is only a down payment; the real tax is settled on the return, and the CRA notes it may not be enough. A bridging year can therefore end with a balance owing even when every withdrawal had tax taken off.

The OAS recovery tax. OAS is reduced when net world income passes a threshold, $95,323 for the October to December 2026 period. Most bridging budgets sit far below that, but a large one-off withdrawal can push a single year over it.

The Guaranteed Income Supplement. For lower-income retirees the calculation is different. The Government of Canada says there is no benefit in waiting to start OAS for people eligible for the GIS, because GIS cannot be paid without OAS and does not increase when OAS is delayed.

Inflation. Both pensions are indexed; a fixed RRSP withdrawal is not. In the bridging years, the household carries more of the inflation risk itself. Our article on what a two per cent increase means against grocery prices shows why the official index and a personal budget can drift apart.

Who this matters for, and what to check

The bridging question is most relevant to people with some savings who are weighing a later start for one pension, and to couples where each partner may start at a different age. Before drawing up a budget like the one above, it is worth having:

1. the official CPP estimate from My Service Canada Account, rather than a guess;
2. an idea of your OAS residence years, since the amount depends on them;
3. the withdrawal and withholding rules for your own savings plans;
4. a realistic view of your own spending, including health costs that rise with age (see which medical receipts are worth keeping).

For why the CPP number differs so much from one person to the next in the first place, start with why two neighbours with similar careers can receive very different CPP pensions.

What the arithmetic shows

Starting CPP and OAS at different ages does not create money; it moves it. The bridging years lean on savings so that the later years lean on indexed public pensions. Laid out month by month, the plan can look alarming in its early years and comfortable in its later ones, even when the total spending never changes. Seeing both halves on one page is usually what turns a vague worry into a decision a household can actually make.