Retirement Planning Software for Couples: Two Plans in One
Couples aren't one plan with a bigger number. Here's what retirement planning software for couples has to model, a checklist for judging any tool, and how the main options compare in October 2026.
Monte Climb7 min readAbout 4 in 10 couples disagree on the age they plan to retire. That's not a small detail. It's the retirement date itself. The figure comes from Fidelity's 2018 Couples & Money study (NAPA, Feb 2019), and it shows why retirement planning software for couples has a harder job than a solo calculator. It has to plan two retirements that draw on one pot of money.
So what should it do? The short answer: model two people, not one person with a bigger balance. That means two ages and two retirement dates, Social Security claimed as a pair, health care costs for each of you, and the years one of you may spend alone. Then it should tell you the odds that the household's money lasts, not draw a single line based on average returns.
Below you'll find why couples are different, a checklist for judging any tool, how the main options compare right now, and where a quick three-number check fits in.
Why couples need more than one plan with a bigger number
Two retirement dates, often not agreed
In the same Fidelity study, 51% of Millennial couples, 44% of Gen X couples and 33% of Baby Boomer couples disagreed on when they planned to retire. And 54% of couples gave different answers on how much they needed to save to keep their current lifestyle (ASPPA, Oct 2018).
One caveat: Fidelity sponsored the survey, and its samples lean affluent. Still, the pattern is easy to recognize. If you two haven't agreed on the inputs, no tool can give you a shared answer.
Age gaps change everything downstream
When one partner is several years older, the household doesn't retire all at once. One of you may stop work, or reach Medicare age, while the other is still years away. The age gap also affects who claims Social Security first and how long the surviving partner might live alone. A tool that only takes one age can't show any of that.
Social Security is a joint decision
For married couples, the rules connect your two benefits. A spouse can receive up to 50% of the other spouse's benefit at full retirement age. A surviving spouse generally keeps the larger of the two benefits (Greenbush Financial, 2026 Spousal vs Survivor Benefits guide; Nasdaq, 2026).
That changes the planning question. The higher earner isn't deciding when to claim just for themselves. In effect, they're also setting the income the survivor will live on later. Franklin Templeton's piece on survivor benefits goes into this in more depth.
The survivor years
When the first partner dies, one Social Security check stops. Many costs don't drop by half, though. Housing, insurance and utilities mostly stay the same. Tax filing usually moves from joint to single brackets too, so the same income can be taxed at a higher rate. Good couples software should show you how the plan holds up in that phase, not only while you're both alive.
Longevity, times two
Social Security's planning guidance says about one in three 65-year-olds may live to at least 90 (Social Security Administration, Retirement Information for Medicare Beneficiaries, 2026). With two of you, the chance that at least one of you gets that far is higher. A plan that stops at 85 is betting against those odds.
Health care, per person
Fidelity estimates a 65-year-old retiring in 2025 will spend $172,500 on Medicare premiums, deductibles and prescriptions over retirement. That figure leaves out long-term care entirely (Fidelity Investments, 2025 Retiree Health Care Cost Estimate, Jul 2025). It's also for one person. A couple has two people's health care to cover, possibly starting in different years.
A checklist for retirement planning software for couples
Use this checklist when you try any tool, including ours. If a trial can't answer most of these, the tool is really built for one person.
| What to check | Why it matters for couples |
|---|---|
| Separate ages and retirement dates | You probably won't stop working in the same year |
| Plan horizon to 95 or beyond | Two lifespans make a long retirement more likely |
| Social Security per person, including spousal and survivor benefits | Claiming decisions affect both of you, and the survivor |
| A survivor scenario | Shows what happens to the plan after the first death |
| Filing status change (joint to single) | The survivor's taxes can go up on similar income |
| Health care per person, year by year | Medicare costs, including income-based surcharges (often called IRMAA), add up separately for each of you |
| Monte Carlo results | A success probability across many possible markets, not one average path |
| Side-by-side scenarios | Lets you compare "your plan," "my plan" and a compromise |
| Combined and separate account views | Different account types, and sometimes different heirs |
| Clear data handling | You're entering two people's finances |
How the main options compare (October 2026)
Even among comparison sites, couples planning gets little attention. In our research, none of the big comparison sites described joint-household modeling in any detail. Here's what the published sources do say. Prices change, so check each vendor's page before you buy.
| Tool | Couples angle | Reported price |
|---|---|---|
| Boldin (formerly NewRetirement) | Markets a retirement calculator for married couples "or any couple" | PlannerPlus $168/yr with a 14-day trial, per Rob Berger's 2026 review. An older review lists $120. |
| ProjectionLab | General planner. Test how it handles two people during a trial | $0 Basic, $129/yr Premium, $549/yr Pro. Free tier includes Monte Carlo (retirementplanningtools.net) |
| Pralana | Offers a Family plan, the only multi-person tier that came up in our research | Sources disagree. Verify with the vendor |
| MaxiFi | Comparisons note its focus on Social Security and taxes | Tier prices vary by source |
| AAII RetirementView | Desktop software with a couples edition | Reviewed as a 2013 product, so it may be dated |
| Spreadsheet | As flexible as you make it | Free, but you build the survivor logic and any simulation yourself |
The practical lesson: use the trial period to run the checklist above. Don't go by the marketing page.
Why a probability beats an average, especially for two
Morningstar's 2025 research puts the safe starting withdrawal rate at 3.9% for a 30-year retirement. That's the rate at which the money was still there in 90% of simulated outcomes (Morningstar, The State of Retirement Income 2025, Dec 2025). Note that the benchmark isn't based on an average return. It's based on how often the money lasts.
That's what a Monte Carlo simulation does, in plain terms. It runs your plan through many possible futures: good markets, bad markets, and bad markets right after you retire. Then it counts how many of those futures still have money at the end. The result is a probability, not a promise.
For couples, this matters more than usual. Your plan has to last as long as the longer-lived of you, and it has to survive the survivor years as well. A smooth average-return line hides exactly the bad sequences that do the most damage over a long, two-person retirement.
Run three plans, not one
If you disagree on timing, stop arguing about it and start comparing numbers. Build three versions:
- Your plan. Your preferred retirement date and spending.
- Your partner's plan. Their date and their spending.
- The compromise. Somewhere in between.
Compare the success rates. A gap of a few points may not be worth a fight. A large one tells you something real, and you can see it on the screen.
Start with the input most couples skip. EBRI's 2025 Retirement Confidence Survey found that only 52% of workers have estimated the monthly income they'll need in retirement. The other 48% haven't (EBRI/Greenwald, Retirement Confidence Survey 2025, Fact Sheet 3). Agreeing on one household monthly spending number is the most useful first conversation you can have.
A note for unmarried and blended couples
Spousal and survivor Social Security benefits are tied to marriage. If you're partners but not married, don't build your plan around benefits you may not be eligible for. Check the rules for your situation. Blended families may also want to see accounts separately, since each partner's money may be meant for different heirs. Any tool you choose should let you view accounts that way.
Where Monte Climb fits
The plan you build here starts with three numbers: age, retirement savings and monthly spending. We run them through 1,000 simulated futures and show you how many stay funded.
One thing to be clear about: the quick calculator on our homepage takes a single age. For a couple, treat it as a household snapshot, not a full joint model. One practical approach is to enter your combined savings and household spending, then run it once at each partner's age to see the range.
A few things that matter for couples:
- Plans run to 95 by default, and you can extend them. This allows for longevity risk.
- Medicare premiums and income-based surcharges are charged year by year, not entered as one flat guess.
- William, our AI planner, answers follow-up questions like "Am I on track?", "Can I retire at 62?" and what spending is sustainable. He shows his work, and you can talk to him like a friend.
- It runs in your browser. Nothing is saved until you say so.
You can try the app with a 7-day trial for $1. It's planning software, not advice.
The bottom line
Good retirement planning software for couples models two people, two timelines and the survivor years, and it gives you the odds instead of an average. Use the checklist above to judge any tool. Agree on a household spending number first. Then compare your plan, your partner's plan and the compromise.
If you want a starting point today, take three numbers and see your household's success rate across 1,000 futures. Then ask William what would change it.
Frequently asked questions
What should retirement planning software for couples include?
At minimum: separate ages and retirement dates for each partner, Social Security modeled per person (including spousal and survivor benefits), health care costs for each of you, a survivor scenario that shows what happens after the first death, and a Monte Carlo success probability rather than a single average-return projection.
Why does a survivor scenario matter so much for couples?
When one partner dies, one Social Security check stops, but many household costs don't drop by half. Tax filing usually moves from joint to single brackets too. A surviving spouse generally keeps the larger of the two Social Security benefits, so claiming decisions made earlier shape the survivor's income.
How much does retirement planning software for couples cost?
Published 2026 reviews list Boldin PlannerPlus at $168 a year and ProjectionLab at $0, $129 or $549 a year depending on tier. Pralana and MaxiFi prices vary by source. Prices change often, so check each vendor's page. Monte Climb offers a 7-day trial for $1.
What if my partner and I disagree on when to retire?
You're not alone. Fidelity's 2018 Couples & Money study found about 4 in 10 couples disagree on retirement age. A practical approach is to run three scenarios (your plan, your partner's plan and a compromise) and compare the success probabilities side by side.
Can I use a single-person retirement calculator as a couple?
Yes, as a household snapshot. Enter combined savings and household monthly spending, and try running it at each partner's age to see the range. It won't capture age gaps, spousal benefits or survivor effects, so treat the result as a starting point rather than a full joint plan.
When can you actually retire?
Three numbers. We run your savings through 1,000 simulated futures, the same engine behind the app, and give you one clear answer.
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