Coast FIRE Calculator for Couples
Running Coast FIRE as a couple is not the same calculation twice. Two ages, two sets of registered accounts and one shared retirement budget change the arithmetic, and the way the target gets split between you decides whether the result reads as reassuring or alarming. This guide explains how the couple mode in our Coast FIRE Calculator splits the number, what the split assumes, and how to read the result when the two of you are in very different positions.
Last updated: September 24, 2026
The short version: the calculator works out one household retirement number from your combined spending (less CPP and OAS), splits it evenly between you, and then discounts each half back to today using each partner’s own years until retirement. Because the older partner has fewer years of compounding, an even split of the target gives them a larger number to have today. Your combined Coast FIRE number is the sum of the two.
How the Coast FIRE calculator for couples works
A Coast FIRE calculator for couples has one household budget to work with but two separate portfolios, so the calculation runs in four steps. If the underlying idea is new to you, start with our guide to what Coast FIRE is, or the walkthrough of how to calculate a Coast FIRE number by hand. Working through them in order also tells you which input to change when the answer looks wrong.
- Household spending, less government benefits. Your combined annual retirement spending minus the combined CPP and OAS you expect gives the amount your two portfolios actually have to produce.
- One household retirement number. That net amount is divided by your safe withdrawal rate, 4 percent by default, which is the same as multiplying by 25. Our 4% rule calculator is the place to test a different rate.
- An even split. The household number is halved. Each partner is responsible for growing their own half by their own retirement date.
- Two separate discounts. Each half is discounted back to today at your real return, over that partner’s years until retirement. The two results are added together for the combined Coast FIRE number.
Step four is where couples differ from individuals. The same $500,000 half is a bigger ask for someone with 27 years of compounding ahead than for someone with 30, so the older partner’s Coast FIRE number comes out higher even when the two of you are aiming at an identical amount. That is not the calculator penalising anyone; it is compounding having less time to work.
Why CPP and OAS matter twice as much for a couple
Government benefits are the single largest input a Canadian couple can get wrong, because both of you collect them. The Government of Canada publishes the CPP retirement pension amounts: the average payment at age 65 is $877.01 per month (April 2026 figure) against a maximum of $1,507.65. Maximum Old Age Security for someone aged 65 to 74 is $751.97 per month for the July to September 2026 quarter; OAS is re-indexed every quarter, so check the current amount. A partner with an average work history therefore collects about $1,628.98 a month, and a couple with two average histories collects roughly $3,257.96 a month, or $39,095 a year.
On an $80,000 household retirement budget, that is almost half your spending covered before your portfolios contribute anything. Leave the field at zero, as most couple calculators do by default, and the household retirement number jumps from about $1.02 million to $2 million, and the combined Coast FIRE number roughly doubles. For the couple in the example below, that single omission overstates what they need invested today by $279,000.
| Input | What to enter for a couple |
|---|---|
| Current age | Each partner’s own age, entered separately |
| Target retirement age | Each partner’s own plan; they do not have to match |
| Current invested assets | Each partner’s own RRSP, TFSA, FHSA and non-registered accounts. Do not combine them |
| Monthly contribution | Each partner’s own monthly investing, entered separately |
| Annual spending in retirement | One combined household figure in today’s dollars |
| CPP and OAS | One combined monthly figure for both partners. Two average histories is about $3,258 per month |
| Return and inflation | Your expected return before inflation (default 7%) and an inflation rate (default 2.5%). The calculator subtracts one from the other, so a 4 to 5 percent real return is the usual planning band. Do not enter a real return in the return field |
Sources: Government of Canada (Service Canada), CPP retirement pension amounts (average at 65 $877.01, April 2026; maximum $1,507.65, January 2026) and OAS payment amounts (maximum $751.97 for ages 65 to 74, July to September 2026 quarter). Verified September 22, 2026.
Example: a Canadian couple with a three-year age gap
David and Sarah, both retiring at 65
David is 38 and Sarah is 35, so David has 27 years of compounding ahead and Sarah has 30. David has $120,000 invested and adds $2,000 a month; Sarah has $80,000 and adds $1,500. They plan on $80,000 a year of household spending in retirement, and both expect an average CPP with full OAS. They leave the calculator at its defaults of a 7 percent return and 2.5 percent inflation, a 4.5 percent real return, with a 4 percent withdrawal rate.
| Step | Figure |
|---|---|
| Household spending | $80,000 |
| Less combined CPP and OAS ($3,257.96 × 12) | −$39,096 |
| Net spending from the portfolios | $40,904 |
| Household retirement number (÷ 4%) | $1,022,612 |
| Each partner’s half | $511,306 |
| David’s Coast FIRE number (27 years) | $155,791 |
| Sarah’s Coast FIRE number (30 years) | $136,519 |
| Combined Coast FIRE number | $292,310 |
| Combined current assets | $200,000 |
| Gap to close | $92,310 |
Two things are worth pulling out. David needs $19,272 more than Sarah today for exactly the same half of the target, purely because he has three fewer years of compounding: a three-year age gap is a 14 percent difference in what each has to have now. And at their current contributions, Sarah reaches her individual target at 39, in four years, while David reaches his at 40, in two. The younger partner is not automatically the one who gets there first; contributions and starting balance matter as much as time.
Where the old version of this page was wrong. Until September 2026 the example on this page halved the household retirement number twice, and reported a combined Coast FIRE number of about $206,000 with a gap of roughly $6,000. On the same inputs the gap was about $208,000. The calculator itself was never affected; only this article was. We have rebuilt the example above on verified figures and re-checked every line of arithmetic, and we are leaving this note here rather than quietly deleting the error.
How to read a lopsided result
The even split is an accounting convention, not a rule about whose money is whose. Its side effect is that the per-partner readout can look alarming while the household is fine. Take the same couple, with the same $200,000 between them, but assume Sarah spent years out of paid work and David holds all of it.
| Split of the same $200,000 | David vs his $155,791 | Sarah vs her $136,519 | Household position |
|---|---|---|---|
| $120,000 / $80,000 | −$35,791 | −$56,519 | −$92,310 |
| $200,000 / $0 | +$44,209 (coasting) | −$136,519 (far behind) | −$92,310 |
The household is short by exactly the same $92,310 in both rows. Only the labels change. If you are reading a result where one of you appears to be coasting and the other appears hopeless, check the combined line first: for a couple who intend to retire together and share a budget, the combined gap is the number that describes your actual situation. The individual lines are useful for a different question, which is whose accounts to direct new money into.
That is where the split stops being purely cosmetic. Canadian registered accounts are individual, so a household that is on track overall can still end up with a badly balanced pair of portfolios, and that has tax consequences in retirement. A spousal RRSP is the usual tool: the higher earner contributes and takes the deduction, but the money grows in the lower earner’s name and is eventually withdrawn at their lower rate. If your individual lines are far apart, that imbalance is worth fixing even though your combined line looks fine.
What the even split does not model
The couple mode is deliberately simple, and it is better to know its edges than to discover them later. Three places where it simplifies:
- It handles a staggered retirement approximately. If one of you stops at 62 and the other at 65, the calculator asks each half to be ready at that partner’s own date, and it adds that partner’s share of the CPP and OAS the household will not yet be receiving. For the couple above, moving Sarah’s retirement from 65 to 62 raises her Coast FIRE number from $136,519 to $172,900: about $19,000 of that is three fewer years of compounding, and the rest is her half of the benefits that do not start until 65. The combined figure rises to $328,691. What it does not model is David’s paycheque covering household costs in those three years, so for a couple where one partner keeps working, treat the result as a conservative estimate.
- It does not adjust CPP for an uneven work history. The combined figure you type in is taken at face value. If one partner took years away from paid work, their CPP will be below average. Dropping one partner to 60 percent of average CPP costs the household about $4,210 a year of benefits and pushes the combined Coast FIRE number from $292,310 to $322,392. Check each partner’s own estimate in My Service Canada Account rather than assuming two average histories.
- It does not model survivor benefits, a workplace pension, or splitting the target unevenly. A defined-benefit pension in particular changes the shape of the answer enough that it needs its own treatment, which is in our guide to Coast FIRE with a pension.
Run your own numbers
Free, no sign-up. Canadian defaults with one-tap CPP and OAS, plus US terms if you need them.
Open the Coast FIRE CalculatorWhat to do when one of you reaches Coast FIRE first
With different ages, balances and contributions, one partner almost always arrives first. Reaching it does not mean that person should stop saving entirely, because the household has not reached its combined number yet. The useful move is to redirect rather than stop: send the freed-up contributions into the other partner’s accounts, either directly or through a spousal RRSP, which closes the household gap and evens out the retirement tax position at the same time.
A Coast FIRE calculator for couples cannot make that judgement for you; it can only tell you how much room the arriving partner has. The other common use is buying time rather than money. Once one partner’s half is on autopilot, their income can go toward the mortgage, a cash buffer, or simply working fewer hours. That is the same logic as barista FIRE, applied to one half of a household. The rest of our tools are listed on the calculators hub. Before acting on either move, it is worth reading how to read the calculator’s results, because the most common mistake is treating a single green status as permission to stop saving across the whole household.
Frequently asked questions
A Coast FIRE calculator for couples differs in what it does with your spending. Running it twice means each of you calculates against the full household budget, which double-counts your spending and roughly doubles the true target. The couple mode works out one household retirement number from your combined spending, splits it between you, and then discounts each half over that partner’s own years to retirement. You get one combined number plus an individual line for each of you.
Because they have fewer years for compounding to work. Each partner is asked to grow the same half of the household target, but the older partner has less time to do it, so more of that half has to be in place today. In our example a three-year age gap means the older partner needs $19,272 more right now for an identical half.
No. Enter each partner’s accounts under that partner. Canadian registered accounts cannot be jointly held: RRSP room is based on your own earned income and TFSA room accumulates individually. Combining the balances would still give the right household total, but it would hide which of you is ahead, which is the main reason to use the couple mode at all.
One combined monthly figure for both of you. Two partners with average work histories collect roughly $3,258 a month between them, based on the published average CPP at 65 of $877.01 and maximum OAS of $751.97 per person, figures that are updated through the year. If one of you has a shorter contribution history, lower the figure and check each partner’s own estimate in My Service Canada Account.
Not necessarily for your retirement date, but usually for your tax bill. Look at the combined line first, because for a couple sharing one budget that is the number that describes your real position. The individual gap matters for a different reason: an imbalance between your accounts means more taxable income in one partner’s hands in retirement, which a spousal RRSP is designed to even out.
Enter each partner’s own target age; they do not have to match. Retiring earlier raises that partner’s Coast FIRE number twice over: there are fewer years of compounding, and more years before CPP and OAS begin, which the calculator funds from that partner’s half. In our example, moving from 65 to 62 adds $36,382 to the amount that partner needs today. The calculator does not count the other partner’s paycheque in those years, so the result errs on the cautious side.
This article and the calculators on BankrateToday are for general information and planning only and do not constitute financial, investment or tax advice. Projections are estimates based on the inputs and assumptions you provide, and actual investment returns vary. CPP and OAS amounts change and depend on your individual contribution history; confirm current figures with Service Canada or the Canada Revenue Agency, and speak with a qualified professional before making decisions.