Personal runway: how many months you last without income (and how to extend it)

Runway = liquid assets ÷ essential monthly spending. Liquid means cash, savings accounts and money-market funds: nothing that takes more than 72 hours to become spendable money or depends on that day's market price.

Stocks do not count the same. You can sell them, yes, but you will probably have to do it exactly when the market is falling, because personal and market crises tend to coincide. If you include them, apply a 30% haircut.

In crisis mode your spending drops sharply: travel, restaurants, subscriptions and deferrable purchases disappear. So compute two runways: one at your current lifestyle and one in austere mode, with only housing, food, transport, health, insurance and minimum debt payments.

The gap between the two numbers is your flexibility buffer. Going from 4 to 9 months without earning an extra euro is usually pure trimmable lifestyle, and knowing that in advance changes how you decide under pressure.

There is no universal number. An employee with a permanent contract, a dual-income household and a stable sector can live well with 4-6 months. A freelancer with irregular income, or a sole earner with dependants, needs 9-12.

You do not need to double your income. Cutting fixed costs by 15% and automating a transfer on payday usually adds five or six months of runway within a year, because it works on both sides: you shrink the denominator and grow the numerator at once.

Order matters. Start with your three biggest fixed costs — housing, car and insurance — because a single negotiation there beats twenty skipped coffees. Then automate, and only at the end optimise the variable stuff.

The buffer is not there to earn, it is there to exist the day you need it. Still, leaving it in a 0% account hands inflation 3-5% a year. The reasonable middle ground is a high-yield savings account or a money-market fund with 24-48h liquidity.

Keep it at a different institution from your everyday account. The friction of an inter-bank transfer stops the buffer eroding into purchases that were never emergencies.

Diego, 34, a developer, had €28,000 saved and a €2,300 monthly spend: twelve months of runway. When his company shut the division down, he did not panic. He cut variable spending to €1,900 and his runway stretched to nearly fifteen months.

He used four months to specialize and turned down two offers worse than his previous job. The seventh interview ended in a contract paying 31% more. The runway did not give him money: it gave him the right to say no.

Runway is only useful if the denominator is honest. Most people calculate their monthly spending by looking at their checking account balance, which mixes fixed costs, splurges and one-off payments like annual car insurance. For a useful number you need two distinct figures: maintenance spending (your real lifestyle, including leisure and subscriptions) and survival spending (housing, utilities, basic food, essential transport, insurance, minimum debt payments and health). The gap between the two is usually 25% to 40%, and that is the margin you have to react without drastically changing your life.

Review the last six months of bank transactions and classify each line into one of the two categories. Do not trust your memory: people underestimate their real spending by 15-20% on average because they forget annual payments, gifts and cash expenses. Divide annual expenses by twelve and add them to the monthly average. This one-afternoon exercise gives you the exact number you are going to divide by your liquid assets, and it avoids the most common mistake: calculating runway using a spending level you have not actually kept to for months.

Once you have both figures, calculate two parallel runways: the survival one (liquid assets ÷ survival spending) tells you how much time you have before hitting rock bottom; the maintenance one tells you how long you can hold out without changing anything. The gap between the two is your decision cushion: the extra time you gain if you act quickly and cut back as soon as you spot the problem, instead of waiting for the money to run out on its own.

The runway money has a single job: to be available when you need it, regardless of what the market is doing that day. That rules out stocks and narrows the options to four vehicles: high-yield accounts, money-market funds, Treasury bills and laddered term deposits. None of them will make you rich, and that is precisely the point: the cushion is not chasing returns, it is chasing certainty. You pursue returns with the rest of your wealth, not with this portion.

High-yield accounts at online banks offer immediate liquidity and rates that in 2024 have hovered around 2-3% APR at the best offers, although these are usually promotions limited to the first few months or to a maximum amount. Money-market funds (the very-short-term fixed-income fund category) closely track the ECB's official interest rate, offer liquidity within 24-48 hours and, if held for more than a year, allow you to defer taxation through fund-to-fund transfers without being taxed, a tax advantage no high-yield account can match.

Treasury bills at 3, 6 or 12 months offer rates similar to or somewhat higher than money-market funds and are exempt from withholding at source, although they are taxed the same way in your tax return. Their drawback is liquidity: if you need the money before maturity you must sell them on the secondary market, with a small penalty. A laddered deposit strategy (splitting the cushion into tranches maturing every month or two) combines somewhat higher returns with constant partial access, useful if your runway exceeds eight to ten months and you want to squeeze some extra yield out of the portion you will not touch soon.

Taxation matters more than it seems for a large cushion. Interest from high-yield accounts and the coupon on Treasury bills are taxed as investment income under the savings tax base, between 19% and 28% depending on the amount. Money-market funds, on the other hand, are only taxed when you redeem, not on every interest accrual, which gives you control over which tax year you declare the gain in. For cushions above 20,000-30,000 euros, splitting between two or three vehicles reduces both counterparty risk and the tax bill if you know how to stagger redemptions.

The generic three-to-six-month standard ignores the fact that the volatility of your income matters as much as its amount. A civil servant and a salesperson on variable commission represent completely different risks even if they earn the same, and applying the same rule to their runway is a calculation error, not a matter of prudence. Runway should be proportional to the probability and speed with which your income can drop to zero, not to a figure you read in a generic article.

A common mistake is calculating runway while ignoring that a layoff brings extra money with it: severance pay and unemployment benefits. Ignoring them leads to unnecessary over-saving; counting on too much of them leaves you exposed. The right approach is to treat them as a secondary runway that only kicks in if the layoff scenario actually happens, and to calculate your base cushion without them to cover the worst case: a resignation, a dismissal without recognized severance, or litigation that delays payment.

In an unfair dismissal, the statutory severance is 33 days of salary per year worked with a cap of 24 monthly payments; in an objective or economic dismissal, it is 20 days per year with a cap of 12 monthly payments. Contributory unemployment benefit covers between 70% (the first 180 days) and 50% (from day 181 onward) of the reference base, with a ceiling that in 2024 hovers around 1,400-1,700 euros a month depending on family dependents, and its duration depends on years contributed, with a maximum of two years if you have accumulated six years of contributions or more.

The real combination is usually better than it looks in the short term: six months of severance pay plus two years of unemployment benefit covers, on paper, a very long runway. The problem is the certainty and timing of payment. Severance can be delayed if there is a settlement hearing or a trial, unemployment benefit takes two to four weeks to start being paid after you apply, and both amounts are usually lower than the net salary you were previously earning. Your personal cushion should cover that first month of uncertainty and the gap between what you used to earn and what you are going to receive, not fully replace these benefits.

You do not need to move to a small town or stop ever going out to gain months of runway. Act on the highest-impact, lowest-sacrifice items before touching the ones that hurt the most. In one month you can review and compare insurance policies (average savings of 100 to 300 euros a year on car and home insurance alone), cancel duplicate or unused subscriptions (the average Spanish household pays for three to five services it barely uses), renegotiate a variable mortgage into a fixed one if rates are falling, or switch from a no-commitment energy tariff to the cheapest one available.

The second set of actions requires a bit more effort but delivers results within weeks: sell items you no longer use (electronics, clothes, furniture), switch on austerity mode in your budget (cut out restaurants, food delivery and impulse purchases for 30 days), and pause contributions to long-term investments for the duration of the emergency, redirecting that money to the cushion. None of these measures forces you to move house or give up future income, and together they usually add one to three months of runway within a matter of weeks.

The third, more drastic set of actions is reserved for when runway drops below two months: subletting a room, requesting a salary advance, taking temporary work even outside your field, or negotiating a principal payment holiday on your mortgage with the bank for a few months. These are genuine emergency measures, not routine optimization, and it is worth having them identified in advance so you do not waste time deciding once the clock is already working against you.

Putting your runway into an index fund or stocks looks profitable on paper: the S&P 500 has historically returned an average of 10% a year, well above the 2-3% of a high-yield account. The problem is not the average return, it is the correlation of risks. Market drops of 20-30% tend to coincide with economic recessions, which are precisely when you are most likely to lose your job. In other words: right when you need the cushion most is exactly when it is worth the least.

In the 2008 crisis global markets fell more than 40% from their highs, and in the covid shock of 2020 they fell 34% in barely five weeks. Anyone who needed to sell their invested cushion at those moments would have locked in losses at the worst possible time, turning money meant for survival into a permanent loss of capital. The cushion is not there to beat inflation: it is there to be intact on the day you need it, whatever state the market happens to be in that day.

The solution is not choosing between return and safety, it is separating the purposes: runway goes into liquid, stable assets (high-yield account, money-market fund, Treasury bills), and the rest of your savings, the part you will not need over the next twelve months no matter what happens, goes into long-term investment. Mixing both objectives in the same portfolio is why many people end up selling at the worst possible moment: they do not sell because they want to, they sell because they need the money to live and the market chose that month to drop 30%.

Leaving a stable job to start a business or to train for a new profession calls for a different kind of runway than a simple safety net: here the goal is not to survive an unexpected event, it is to fund a period without income that you are planning yourself. The industry rule of thumb is twelve to eighteen months of survival spending, because most businesses take nine to fourteen months to generate stable revenue, and finding a new job after intensive training usually takes an additional three to six months of active search.

Before taking the leap, calculate three scenarios: the optimistic one (income within six months), the realistic one (within twelve) and the pessimistic one (nothing within eighteen months, at which point you need a plan B). If your runway only covers the optimistic scenario, you are not ready to start a business, you are gambling. Many viable businesses die not because the idea was bad, but because the founder ran out of cushion in month ten, right before sales were about to take off.

An intermediate strategy that reduces risk is the partial runway: keeping a transition income (part-time work, occasional freelance jobs, an anchor client) that covers survival spending while you develop the project or complete your training. This stretches your real cushion several times over, because you are not consuming it at the pace of your total spending but only at the pace of the gap between what you earn and what you spend, and it reduces the psychological pressure of watching the account shrink every month with no income to offset it.

Having used up the cushion is not a failure, it is exactly what it was there for. The mistake comes afterward, if you do not rebuild it with the same discipline you used to create it the first time. As soon as you have stable income again, treat rebuilding your runway as a priority debt, on the same level as a loan, and automate a fixed monthly transfer until you recover at least the minimum level for your profile (three to six months according to the criteria above).

Rebuilding is usually faster than the first time because you already know your real spending precisely, you already have the account or fund set up to hold it, and you have probably trimmed expenses during the crisis that you do not fully reinstate. Take advantage of that reduced spending: if you used to live on 2,300 euros a month and cut down to 1,900 during the emergency, keeping part of that cut while you rebuild the cushion can get you six months of runway back in half the time it took the first time.

Finally, document what happened: how long you went without income, which expenses turned out to be non-negotiable, which unexpected events you had not anticipated, and how long it took you to find work again or generate income once more. That information is worth more than any generic figure from an article: it is your own historical data, and it lets you set your target runway to a number based on your real experience, not on an average that may not fit your situation or your industry.