In 2018 I was Group CISO at a major bank, running cybersecurity across dozens of countries, and I was also quietly building a business on the side. Cyber Leadership Institute, which I co-founded, started as an idea we tested in the margins of the week: early mornings, weekends, the occasional lunch hour spent writing course material instead of eating at my desk. It went on to become a seven-figure business, and I built it while I was still employed full-time.

I am not telling you that story to impress you. I am telling you because the single biggest misconception about starting a business is that you need to quit your job first. You do not. In fact, quitting before you have built anything is one of the riskiest moves you can make, especially if you are a senior executive with a mortgage, a family, and a lifestyle built around a salary that took decades to reach.

What follows is the 90-day framework I now teach to executives who want to build something of their own while still collecting a pay cheque. I need to be upfront about what 90 days actually delivers: a tested foundation, not a cash-flowing business. Anyone who tells you that you can go from zero to profitable in three months while working a demanding corporate role is either lying or selling you something. But 90 days is enough to know whether your idea has legs, whether people will pay for it, and whether you actually want to do this, which is more progress than most people make in years of thinking about it.

Why most people never start (and why that is actually rational)

Many people fail to escape corporate not because they lack ambition but because they lack the financial foundation to do so safely. That is not a character flaw but a planning problem.

When you earn $300,000 or $400,000 a year, the gap between what you earn and what you could earn from a brand-new business feels enormous. So you keep waiting. You wait until you have "enough" saved, until the idea is "fully formed," until you feel "ready." And that wait stretches from months into years, because none of those conditions are ever perfectly met.

The fix is not to be braver. The fix is to treat starting a business as a process rather than a single event, and to run that process while you still have the safety net of a salary underneath you.

Before you build anything: know your number

Early-retirement writers like Kristy Shen call it your FI number. I call it your freedom number, and it is the single most important calculation you will do before any business planning starts. Your freedom number is not what you want to earn or aspire to have. It is the minimum you actually need to cover your life without a corporate salary.

Start with your annual burn rate: total household expenses minus any passive income you already have (rental income, dividends, a partner's salary if that is part of your joint plan). That gap is what your business eventually needs to fill, and knowing the exact figure changes everything about how you think about this project.

If your burn rate is $180,000 a year and you have $60,000 in passive income, your freedom number is $120,000. That is a very different target from the $400,000 salary you are currently earning, and it is a much more achievable one for a new business in its first few years.

Many executives skip this step because it feels too simple. But without it, you are building towards a vague idea of "enough" that keeps shifting every time you look at it.

The 90-Day Freedom Formula

This framework splits 90 days into three distinct phases. Each one has a specific output, and you should not move to the next phase until the current one is done. The temptation will be to jump straight to building a product, and it is worth resisting, because foundation work is not exciting, but it is the difference between a business that lasts and one that burns out in six months.

Days 1 to 30: The foundation

The first month is entirely about clarity and financial reality, which means no product, branding or website yet, just honest answers to the questions that matter.

Days 31 to 60: The prototype

Dan Koe said something that stuck with me: "The only way to control your income, and therefore your life, is to create a product." He is right, but the product you create in month two should be the minimum viable version, not the polished final thing.

This is what I call the Minimum Viable Exit. You are not trying to build a perfect business. You are trying to answer one question with real evidence: will someone pay for this?

Days 61 to 90: Validation and systems

The final month is about turning early signals into a repeatable process. You are still employed, so everything you build needs to run without you being available eight hours a day.

The time problem (and why it is smaller than you think)

Many senior executives I talk to raise the same objection: I do not have time. And when I look at their calendars, they are usually right. They are packed from 7am to 7pm with meetings, travel, and the kind of operational work that fills every available minute.

But time is not really the constraint, priority is. When I was building CLI alongside my CISO role, I did not find extra hours in the day. I made different choices about how I used the hours I already had. I stopped watching television most evenings and got up at 5am three days a week, and I said no to social commitments that did not matter to me. None of that was heroic, it was just a decision about what I wanted more.

You need somewhere between five and ten hours a week to make meaningful progress in the first 90 days. If you genuinely cannot find that after auditing your time, the problem is not your schedule. The problem is that you are not ready to start, and that is fine too. Better to know now than to start and abandon it three weeks in.

What 90 days will not give you

I want to be direct about this because too many people sell the fantasy of quick results. After 90 days of disciplined work alongside your job, you will have clarity on your business concept, early evidence of whether it works, basic systems to keep it running, and a realistic plan for the next phase.

What you will not have is a business that replaces your salary. That takes longer, often 12 to 24 months of consistent building, and it depends on the type of business, your market and how much time you can invest. Your age and runway matter too, which I cover in planning your exit at 40 versus 55. The 90-day framework builds the foundation that makes everything after it possible. Skipping the foundation is how you end up six months in with no customers and a growing pile of regret about time wasted.

The real risk is doing nothing

I am not here to tell you that corporate careers are bad. Thirty years in corporate built everything I have today: the expertise, the network, the credibility, the leadership skills that made CLI possible and that now make my coaching business possible. Corporate gave me all of that, and I am grateful for it.

But depending entirely on a single salary with no assets underneath it is a vulnerable position, and it is getting more vulnerable every year as AI reshapes industries and eliminates roles that seemed untouchable. The question is not whether you should quit. The question is whether you are building anything outside your job that would catch you if the job disappeared tomorrow.

Ninety days is enough to start answering that question with action instead of anxiety. You do not need to quit or wait for permission, and you do not need to have it all figured out before you begin. What you need is a clear framework and a few hours a week, along with the honesty to test your idea against reality instead of letting it live forever as a daydream.

If you want to know where you stand before day one, the free assessment below gives you a clear read in about five minutes.