Three months of coverage: how much liquidity to keep on hand
If your income stopped tomorrow, how many months of life could you pay for with the liquid money you have today?
It's not a rhetorical question. It's a metric.
An unexpected event, an illness, a transition between contracts, a month without invoices for a freelancer: life has plenty of ways to interrupt the flow that brings your paycheck every month. When that happens, you have two possible answers.
The first is a feeling: I think I can make it. For a while. The second is a number: I can make it for five months without touching anything else.
There's a world of difference between those two answers. The decisions you make in the following weeks are different. The calm you make them with, too.
That second answer — the number — is your months of coverage. It's the third of the four metrics of your fix, and that pillar tells the story of all four together.
And it's the metric that, more than any other, creates calm. It doesn't tell you how rich you are. It tells you how well you can sleep at night.
What months of coverage actually is
The equation is extremely simple:
Liquid money you have today ÷ monthly fixed expenses = months of autonomy.
Let's take an example. Sarah has $9,000 in her checking account and no other money on hand. Her fixed expenses — rent, utilities, groceries, insurance, internet — add up to $1,800 a month.
Her coverage is: 9,000 ÷ 1,800 = 5 months.
Five months is the time Sarah can go through without a dollar of income, without selling anything, without taking out a loan. Sleeping soundly.
There's an important difference between "I have $9,000 in the bank" and "I have 5 months of coverage." The first is a quantity. The second is a ratio. Only the second means something.
Think of two people with the same balance: $30,000 in liquidity.
The first has fixed expenses of $5,000 a month: their coverage is barely 6 months.
The second has fixed expenses of $1,500 a month: their coverage is 20 months.
Same number in the bank, completely different situation. The first is in an adequate position, nothing more. The second has a huge cushion — probably too big (more on that in a moment).
The bank balance, without its ratio to fixed expenses, says nothing. It's a number in search of a meaning. Months of coverage gives it one.
What counts as "liquid"
Liquid means something precise: money you can use within 24 hours without selling anything else.
Let's go through it by category.
Yes, it's liquid: your checking account, your high-yield savings account (the one you can withdraw from whenever you want), cash, money market funds with daily liquidity — very cautious products that invest in very short-term securities and let you exit without penalties in a few days — and short-term Treasury bills (T-bills) maturing in a few months.
No, it's not liquid: stock ETFs, 10-year Treasuries, long-term bonds, real estate, private funds, your car, art.
All of these have value. Some are even sellable quickly. But in case of emergency you risk selling them at the wrong moment, at a discount — making the situation worse.
A concrete example. You have $10,000 in stock ETFs. On paper it's $10,000. Tomorrow the unexpected hits and you have to cash out in 48 hours. You sell at the first available price, maybe on a bad day, and you walk away with $8,000.
That ETF wasn't $10,000 of coverage. It was $8,000. The difference is the price of haste.
The same goes for the house, the real estate fund, the artwork you inherited. Assets that exist in your wealth, but that serve other purposes — not to cover you against a short-term unexpected event.
There are honest in-between cases. The 6-month CD (certificate of deposit) with an early-withdrawal penalty: technically liquidatable, but at a cost. For most Cashfulness users, in practice, I wouldn't count it as coverage. If you're willing to accept the penalty as the price of peace of mind, then yes — but it's a conscious choice, not an automatic inclusion.
Same goes for stocks and medium-to-long-term bonds: some Cashfulness users count them as liquid, because they're "marked to market" every day and can therefore be cashed out quickly.
You can lose money if you sell at a bad moment, but the certainty of being able to convert them into available cash shouldn't be underestimated either.
A house, on the other hand, doesn't sell in a few days: even in the best case, finding a buyer is a long process — listing, showings, negotiation, contract, closing...
This whole liquid / non-liquid distinction lives alongside another one — the distinction between Asset+ and Asset−: here we're only talking about immediate availability, not asset quality.
How to calculate "monthly fixed expenses"
The other side of the fraction: what do you put in the denominator?
Fixed expenses are the ones that continue to exist even if your income stops tomorrow. The control question is simple: if I didn't work at all for a month, would I still have to pay this expense?
If the answer is yes, it's fixed. If it's no — or "I could cut it tomorrow without major consequences" — it's variable.
Fixed: rent or mortgage, baseline utilities (electricity, gas, water, garbage), realistic minimum grocery spending, mandatory insurance, signed auto or appliance payments, necessary subscriptions (basic phone, basic internet, recurring medications).
Variable: restaurants, vacations, extra clothing, gym, streaming, magazines, gifts, hobbies.
An important note on grocery spending. It's not zero — you can't stop eating. But it's not your current level either, which probably includes plenty of non-essentials.
It's the level of dignified survival: the number you need to eat well but without extras, for one month without income. Set that number now, even roughly, and use that.
A methodological tip: honest months of coverage is calculated on fixed expenses + survival groceries, not on your current lifestyle.
If you calculate it on your current lifestyle, the number you get is too big and scares you. And it loses its function, which is to orient you — not to weigh you down.
Why three months
All the Anglo-American schools of thought — the classic emergency fund tradition — recommend six, nine, twelve months of coverage. We propose a different line.
Three months is the minimum baseline for someone with stable income: salaried employee on a permanent contract, pensioner.
That's the window within which, in the vast majority of cases, real unexpected events get resolved. Finding a new job in the same sector. Recovering from an illness that keeps you down. Handling a major home or car repair.
Six months if income is volatile: self-employed, freelance, commission-based professionals, seasonal workers. Here the cushion has to absorb not just emergency, but the endemic variability of income itself — the quarter without invoices that isn't an emergency, it's just the rhythm of the work.
Beyond six months, it's almost always too much. And this is where the concept of opportunity cost comes in: the return you give up by keeping money still instead of letting it work elsewhere.
Every dollar parked at low or zero yield — checking account, low-rate savings — is working against inflation. On the portion of coverage strictly needed, that's the price you pay for peace of mind: you accept it, and rightly so. On the excess, it's money that could be building your Asset+, that part of your wealth that produces income instead of draining it.
If you have twelve months of coverage in an account paying 0.5%, you're losing purchasing power on 75% of that cushion. Six extra months of comfort are costing you, every year, a small silent erosion that adds up over the long term.
Three isn't a sacred rule. For some the right number is four, for others five. The point is different: don't confuse prudence with paralysis. More cushion, up to a point, is prudence. Beyond that point, it's fear dressed up as prudence.
When the number is telling you something
A practical traffic light to read where you are.
Below one month: the moment to focus on coverage, before any other financial goal. Not panic — action. Rebuilding one month of coverage is the first step from which everything else starts.
Between one and three months: you're building. It's a working position, not an arrival. The only mistake here is stopping before three. Once you're there, you're there.
Between three and six months: sleeping soundly. The metric does what it exists to do. From here on, every excess liquid dollar has an opportunity cost worth looking at.
Beyond six months: probably too liquid, unless you're in a specific life phase — a planned job change, a pregnancy, buying a house in the next twelve months. In those cases the excess has a specific short-term destination, and it makes sense to keep it there.
Outside of those phases, it's worth asking yourself where the excess is working. Not to move it right away — just to ask the question.
What to do if you're below three months
The advice many readers are waiting for. I'll try to handle it practically, without alarmism.
The first thing you should NOT do: sell a depreciated asset — a stock that's down, a bond below par, a fund that has lost value in recent months — to "feel safer."
You're monetizing a loss to cover a fear. It's the exact same mechanism as selling at a discount in an emergency, applied in advance. You're not solving coverage: you're financing it at too high a price.
What to do instead, in three steps.
First: calculate the delta. How much do you need to reach three months of coverage? Make the number, write it down somewhere. Example: you need $2,000 more.
Second: identify one single variable expense to reduce for the next six months. One, not five. For example: eating out, minus $300 a month. Over six months that's $1,800. You're almost there.
Third: park the delta in a separate account from your operating one. Not an investment, not a fund, not a CD: a regular high-yield savings account, where the money doesn't blend with this month's cash flow and you can watch it grow.
Rebuilding coverage is a small, repeated exercise, not a heroic undertaking. It's the same idea underneath all of Cashfulness: discipline comes from order, not from willpower. An order that holds itself, once you set it up.
In six months, with the delta above, you're at three full months. It's a reachable horizon, not a mountain.
Sleeping soundly
Months of coverage is the most undervalued fix metric because it doesn't look like wealth.
Three months of salary in the bank don't make you feel rich. They don't give you the feeling that your net worth is growing. You don't tell friends about them. That's why many people, as soon as coverage is in place, forget about it and look elsewhere — to investments, real estate, retirement funds.
They're wrong. Three months isn't wealth, it's sleeping soundly.
And sleeping soundly is the condition for all the other fix metrics — net worth, the ratio between Asset+ and Asset−, the gap between what you think you have and what you actually have — to be able to work for you. Without the background anxiety that paralyzes every decision.
Without coverage, every investment is made with the fear of having to dump it tomorrow. Every job change is made with the fear of not making it to the end of the month. Every important choice is contaminated by that fear.
With coverage, choices become free again. Not because everything always goes well, but because an unexpected event stops being a catastrophe and becomes what it really is: an unexpected event.
Money is a tool to buy time and freedom. Months of coverage buys something very specific: reaction time. The scarcest resource when something goes wrong.
— Vittorio