When Can You Retire?
The honest way to answer this does not start with a FIRE number and a twenty-five-year forecast. It starts with a simpler question: if your income stopped today, how long would your money actually last? Work it out below, then use the app to keep it honest as your wealth and expenses change.
Retirement Savings Calculator
The calculation itself is deliberately simple. Take your accessible savings, the money you could actually get your hands on if you needed it, and divide it by your monthly expenses, after subtracting any income that would keep arriving anyway. What’s left is your runway in months.
Money you could actually spend. Leave out property and locked retirement savings.
What your life costs to run each month.
Income that keeps coming after you stop working: rent, dividends, a pension. Not your salary.
Enter your savings and monthly expenses to see how long your money would last.
A rough guide. It assumes your investment returns roughly keep pace with inflation, so the two are left out and cancel each other out. Not financial advice.
The Two Numbers That Actually Decide It
Most people think retirement is a savings target. Get to a million dollars, or two million, or whatever round number feels safe, and you’re done. But net worth on its own doesn’t tell you when you can stop working. It doesn’t pay this week’s bills, and it doesn’t tell you how long your money will actually last once the pay cheques stop.
The real question isn’t just when you can retire, it’s how much do you need to retire, and the two are more closely tied together than most people realize. What actually decides when you can retire comes down to two things. The first, and by far the most important, is whether your passive income covers your passive expenses. The second, for almost everyone who isn’t quite there yet, is how big a lump sum you have to bridge the gap, and how long that lump sum will last.
Both of those things live in your cash flow, not in a single net worth figure sitting somewhere in your head. That’s a genuinely hard thing to keep clear once you’ve got more than one income stream, an investment property, a share portfolio, and the usual mess of everyday spending sitting on top of it all. That’s what Where Does My Money Go is actually for: cash flow management to fuel your wealth, and to track your investments, so that instead of a rough feeling about where you stand, you get an actual clear picture, which is what the numbers above depend on.
The Best Case: Income That Covers Expenses Forever
If the passive income you receive from shares, a pension, rental income, or any other source that keeps arriving without you working for it is equal to or greater than what you spend, you’ve solved retirement. It doesn’t matter how long you live. You could retire today and keep going indefinitely, because the money coming in never runs dry.
This is the number worth aiming for if you can get there. It turns retirement from a countdown into a steady state. You’re not drawing down a pile of savings and watching it shrink, you’re living off the income the pile produces while the pile itself stays intact, or even keeps growing.
For most people though, this is a high bar. Building enough passive income to fully cover your lifestyle usually takes either a very large asset base, a very modest lifestyle, or both. So most retirement plans end up leaning on the second lever instead, or a mix of both.
You can’t know which camp you’re in without seeing your passive income and your expenses side by side, and that’s genuinely difficult to do in your head once dividends, rent, and a pension are all landing at different times of the month. You don’t need a complicated passive income calculator for this, just a clear view of both sides. Our wealth tracker exists to give you that clarity in one place. Watching your investments and your income streams alongside what you actually spend is how you find out whether you’re closer to the best case than you think, or how big the gap really is.
The More Common Case: Income Plus a Lump Sum You Draw Down
For most people, retirement is a combination. You’ve got some passive income, maybe dividends from shares, maybe a pension, maybe rental income from an investment property, and then you’ve got a lump sum of savings sitting alongside it that you draw from to cover the rest.
In this scenario, how long your retirement can last depends on two things working together. How big is the gap between your income and your expenses, and how big is the lump sum you have to cover that gap. A bigger gap burns through your savings faster. A bigger lump sum buys you more time. Put those two together and you get a runway, a number of months or years your money will last before it runs out.
This is really what a retirement savings calculator is answering. Not “will I be rich enough,” but “how long will my savings last if I stopped working today, given the income I’ve already got coming in and the savings I’ve already built.”
The size of that gap is only ever as accurate as your cash flow numbers. A cash flow table that’s actually tracking your real income and real spending, rather than a rough monthly guess, is what turns this from a back of the envelope figure into one you can trust.
Why Investment Returns and Inflation Are Left Out
If you’ve used the retirement savings calculator, you’ll notice it doesn’t ask you for an expected rate of return, or an inflation assumption. That’s deliberate, not an oversight.
Say you’ve got $500,000 sitting in shares, and you’re living off the dividends rather than selling shares down. As inflation sets in, the companies you own are raising their prices too, so the dividends they pay out tend to rise with inflation, and the value of the shares themselves tends to rise as well. Your income keeps pace, and so does your capital. That’s the same mechanism that’s underneath any FIRE calculation, it’s not different math, it’s the same math. The reason the retirement savings calculator can leave it out is that the two effects are already baked into each other. You don’t need to separately forecast a return and separately forecast inflation and then net them off, the dividend growth is doing that for you as it happens.
That’s really the whole reason the calculator can afford to treat your number as flat. Not because growth and inflation don’t matter, but because if your capital is actually invested and producing an income that grows with the cost of living, the number holds its real value without you needing to model either side of it separately.
Turning Capital Into Income
One of the strongest arguments for growing your wealth well before retirement, rather than scrambling to figure it out the year before, is that wealth in the right form can be converted into income. Cash sitting in a bank account can’t really do that for you. Shares and property can.
If you’re holding an investment property with a lot of equity built up in it by the time retirement rolls around, that equity is doing nothing for your monthly cash flow unless you turn it into something that generates income. That might mean making sure the property is actually producing solid rental income rather than just capital growth on paper. It might mean selling and moving that capital into a diversified share portfolio that pays dividends, spreading the risk that comes with having a large chunk of your wealth tied up in a single asset. Proper investments, the kind actually built to produce a return rather than just hoping a market goes up, are what allow a lump sum to start behaving like income.
This isn’t a recommendation to buy any particular kind of asset, and it isn’t financial advice on how to structure your portfolio. That’s a conversation for a licensed adviser who knows your full situation. But it’s worth flagging as one of the clearest reasons that how you hold your wealth matters just as much as how much of it you have. A million dollars sitting as untouched equity in a house behaves completely differently, for retirement purposes, to a million dollars spread across income producing shares.
Whichever way you go, you want to be able to see it. Tracking your investments alongside your property in one wealth tracker means you can actually watch capital turn into income over time, rather than checking a bank balance and a rental statement separately and trying to hold the whole picture in your head.
The Question This Calculator Doesn’t Answer
There’s a second question that sits alongside all of this, and it’s an important one, but it’s genuinely a different calculation. How long is it going to take you to get to your number in the first place, and really, how much do you need to retire in order to know what that number even is.
Before you can work out your runway, you need to know two things: what your number actually needs to be, and how long it’s going to take you to accumulate it. Getting the number right depends on your expected expenses in retirement, which for most people are lower than their working expenses but not dramatically so. Working out how long it will take to get there depends on how much you’re saving and investing now, and what kind of return those investments are realistically likely to generate over the years between now and when you retire.
That accumulation phase calculation is where the compounding and inflation assumptions we deliberately left out above become genuinely important again, because you’re now talking about years or decades, not months. It’s the kind of question a long-term retirement projection is built to answer, not this one. This page is about what happens once you’re standing at the retirement line already, not about how long the walk there is going to take.
What you can do now, while you’re still in that accumulation phase, is make sure you actually know your real savings rate rather than guessing at it. A cash flow table that’s tracking every dollar in and out is what tells you, honestly, how much you’re putting toward that number each month, and whether it’s enough to hit it in the timeframe you’re hoping for.
Keep It Current
A retirement number worked out once and then filed away goes stale almost immediately. Your expenses change. Your investments move. The rental comes in a bit lower this quarter, or your share portfolio has a good year, or you take on a new expense you hadn’t planned for. A runway figure calculated in January and never revisited tells you less and less about your actual position as the months go by.
That’s really the case for treating this as something you check rather than something you work out once and trust forever. If your net worth and your cash flow are both being tracked from your own accounts rather than estimated from memory, your runway becomes a live number you can glance at rather than a guess you made six months ago and hoped still held true. That kind of clarity is exactly what Where Does My Money Go is built for, cash flow management to fuel your wealth, and to track your investments, all in one place, so the complexity of multiple income sources and a growing asset base stops being something you have to hold in your head. Pairing the runway figure with a proper net worth tracker and cash flow table means both sides of the sum, what you’ve got and what you’re spending, stay clear without you having to redo the math every time something changes.
It’s also worth keeping this figure separate from, rather than instead of, your rainy day fund. A rainy day fund is about surviving a short, sharp shock, a job loss, an unexpected bill, a few bad months. Your runway is the bigger picture question sitting behind it: not just can you survive a shock, but how much genuine room you have to change direction, take a break, or ride out a harder year than usual.
The Bottom Line
When you can retire isn’t really a single number. It’s the answer to two much simpler questions, and really, the same question underneath both of them: how much do you need to retire, given what’s coming in and what’s going out. Does your passive income already cover your expenses, in which case you’re done and the clock stops mattering. And if it doesn’t yet, how long will the gap between the two, covered by your savings, actually last. Work those two things out honestly, keep them updated as your numbers change, and you’ve got a genuinely useful answer to a question most people only ever guess at.
If your finances are simple, one income, one account, one goal, you probably don’t need much more than a notebook to work this out. But if you’re juggling a share portfolio, an investment property, self-employment income, or all three at once, that clarity doesn’t happen by accident. It’s exactly the kind of complexity Where Does My Money Go was built to sort through, not by telling you what to spend, but by giving you a clear, current picture of where you actually stand so you can make this call with real numbers instead of a guess.
Disclaimer: We are not financial advisers. The information on this website is general in nature and does not take into account your individual circumstances. You should seek independent professional advice before making financial decisions.
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