How Much Runway Do You Need Before Leaving a Corporate Job After 40?

I have made the move from corporate roles to building my own companies, and I have coached many executives through the same exit. The question they all ask first is not whether they should go. It is whether they can afford to. The honest answer is that most of them can, but almost none of them know the number, and a decision made without the number is either reckless or endlessly postponed. This post gets you to the number.

Why is runway different after 40?

Because the obligations are real and the recovery time is shorter. At 28, a failed first year means moving to a smaller apartment and taking a job. At 48, it may mean a mortgage, tuition, aging parents, a partner who built their plans around your salary, and a résumé that some recruiters will read differently after a gap. None of that means you should stay. It means the planning has to be more careful than the version you would have done 20 years ago.

There is also an advantage people over 40 tend to discount. You know your spending. You know your network. You know roughly how long a sale takes in your industry and how long an invoice takes to get paid. Those are the inputs to a realistic runway, and younger people have to guess at them. You do not.

How do you calculate your own runway number?

Sit down with 12 months of bank and card statements and build three lines.

1. Essential monthly expenses. Housing, food, utilities, insurance premiums, debt payments, transportation, childcare or tuition you have already committed to, and the minimum that keeps the household running normally. Be honest about what is essential. The goal is not a monastic budget. It is to know what you are protecting.
2. Health coverage without an employer. Look up what coverage for your household would actually cost if you buy it yourself or continue your employer plan under the rules that apply to you. For many executives this is the single biggest surprise in the whole exercise, and it belongs on its own line so it does not get lost inside a general number.
3. Taxes on first-year income. When you earn money on your own, nobody withholds taxes for you, and self-employed people often owe more than they expect. Set aside a percentage of everything you invoice from the first dollar. Your accountant can tell you the right percentage for your situation.

Add the first two lines together and multiply by 12 for the floor and 18 for the comfortable number. That is your runway target. Most executives find the result is larger than they hoped and smaller than they feared.

What counts as runway, and what does not?

Counts: cash in accounts you can reach without penalty, and savings you have specifically decided to spend on this transition. The test is simple. If a client pays late in month seven, can you cover the mortgage from this money without selling something at a bad time or borrowing? If yes, it is runway.

Does not count: retirement accounts you would pay a penalty to touch, home equity you would have to borrow against, a bonus that has not been paid, severance that has not been signed, equity that has not vested, and a partner's income if that income is already covering its own share of the household. Some of these are fine as a last line of defense. None of them should be in the plan. Executives who count money that has not arrived yet tend to resign around a date that money then fails to meet.

A special note on severance. If you are leaving because the company is reorganizing, negotiate the package, get it in writing and let it clear before you count a dollar of it. If you are leaving by choice, assume there is none.

How do you lower the number?

The runway target is not fixed. There are three levers, and all three are easier to pull while you still have a salary.

Cut committed expenses before you leave, not after. Refinancing, renegotiating, canceling and downsizing are all simpler with a payslip in hand. Every hundred dollars you remove from the monthly essentials removes twelve to eighteen hundred from the target.

Start earning before you stop. The executives who make the cleanest exits usually have the first version of the new work running on the side for three to six months before they resign: a small advisory client, a paid speaking engagement, a pilot project. Check your employment agreement first. Where it is allowed, this does two things at once. It shortens the gap before income arrives, and it tests whether anyone will pay for what you plan to sell, which is the question that matters most and the one a savings balance cannot answer.

Line up the first client before the last day. One signed engagement, even a modest one, changes the psychology of the whole year. You are not starting from zero. You are starting from one, and the second client is always easier to find than the first.

What are the signs you have waited too long?

Runway planning has a failure mode on the other side, which is using the number as a reason never to go. The signs are familiar: the target keeps moving up every time you get close to it, you have been "one more bonus cycle" away for three cycles, you find yourself resenting people who left with less than you have, and the plan for the new work is in exactly the same state it was a year ago.

If you recognize that pattern, the finances are probably not the obstacle. The career premortem is a 15-minute exercise for finding out what is. And if you are not sure whether the new work is viable at all, that question is worth more of your attention than the twelfth decimal of the runway number. The five-person team I was part of that generated $32 million in revenue did not start with a large cushion. It started with a clear offer that people wanted to buy, and that is the variable most executives underweight when they do this math.

What should you do this week?

Build the three lines. Multiply. Write the number on a page with today's date and the date you expect to hit it. Then have one conversation with the person whose life this decision affects most, with the page in front of you both. Executives who reinvent themselves well after 40 are not braver than the ones who do not. They have simply replaced a vague fear with a specific number, and specific numbers can be planned for.

If you want help deciding what the new work should be and whether anyone will pay for it before you spend a dollar of runway finding out, that is what the coaching engagement is for. The longer version of how executives over 40 rebuild on purpose is in There Is No Tomorrow.

This post is general education about the finances of a career change. It is not personal financial, tax or legal advice. Your situation may differ in ways that matter, so talk to a qualified financial professional before making decisions about your own money.