How to Calculate Exactly If You Can Afford to Quit

Most people planning to leave their job do not calculate whether they can afford to. They estimate. They feel whether it seems feasible. They make a rough comparison between their savings and some vague sense of how long those savings should last.

The estimates are almost always either too conservative or too optimistic. Too conservative, and people who could safely leave stay in depleting situations for years longer than necessary. Too optimistic, and people leave before they are financially prepared and make panicked decisions that undermine the business they are trying to build.

The calculation is not complicated. It takes about an hour. And the number it produces is more useful than any amount of intuitive assessment.

Here is the exact process.

Step One: Calculate Your Survival Floor

Your survival floor is the minimum monthly amount you need to cover essential obligations with nothing optional included.

Go through your bank and card statements from the last three months. Identify every recurring expense. Then apply one filter to each: if you lost your job today and needed to stretch your savings as far as possible, would this expense be non-negotiable?

Non-negotiable items include: rent or mortgage payment, utilities, basic food and household supplies, essential transport, health insurance or coverage, minimum debt payments on any outstanding loans.

Everything else is optional. Not unimportant. Optional. The streaming subscriptions, the gym membership, the eating out, the discretionary spending. These are the items that compress in a genuine survival scenario.

Total the non-negotiable column. That number is your survival floor.

For most mid-level professionals, the survival floor is 40 to 65 percent of their current monthly spending. The gap between what you currently spend and what you actually need is often the most clarifying number you have ever calculated.

Step Two: Calculate Your Liquid Runway

Take your current liquid savings. Cash in savings accounts plus any short-term accessible funds. Not investment accounts that require timing to liquidate without loss. Not home equity. Not retirement savings behind penalty walls. Liquid cash that you can access this week.

Divide that number by your survival floor.

The result is your raw runway in months.

If you have 18,000 dollars in liquid savings and your survival floor is 1,500 dollars per month, your raw runway is twelve months.

This is the baseline. The number of months you can survive on savings alone with zero income from any source.

Step Three: Adjust for the Income Bridge

If you are already generating any income outside of your salary, that income reduces the net monthly draw on your savings and extends the runway.

Monthly side income divided by survival floor gives you the proportion of the survival floor already covered. Subtract that from the survival floor to get the net monthly draw. Then divide your savings by the net monthly draw.

Example: 18,000 dollars in savings. Survival floor of 1,500 dollars. Side income of 500 dollars per month. Net draw is 1,000 dollars. Adjusted runway is eighteen months, not twelve.

The income bridge transforms the same savings into significantly more runway. This is why building even a small income stream before leaving has a leverage effect that is disproportionate to its size.

How to Replace Your Salary With a Side Hustle and How to Freelance While Employed: The Quiet Way to Build Income cover the fastest routes to building the income bridge while still employed.

Step Four: Match Runway to Your Business Model

The adjusted runway you calculated in step three needs to be compared against the runway actually required by the business you are building.

Required runway by business type: Service business or freelancing: six months minimum. Revenue can arrive within the first one to three months if you have been building client relationships before leaving. Six months provides adequate buffer.

Digital products such as guides, templates, or courses: eight to twelve months. First meaningful revenue typically arrives between month three and six. Full survival-floor coverage typically arrives between month six and twelve.

Newsletter or subscription content: twelve to eighteen months. Audience-building precedes revenue. This model requires the longest runway because the monetisation depends on audience size that takes time to compound.

SaaS or software products: twelve to twenty-four months. Development plus go-to-market plus adoption curve means this is the highest-runway model available to a solo founder.

If your adjusted runway meets or exceeds the required runway for your model, you are financially prepared to leave from a runway perspective.

If the gap is significant, you know exactly how much additional saving or income bridging is required before leaving makes financial sense.

Step Five: Add the Emergency Cushion

The runway calculation assumes the world behaves predictably. It does not.

Add a buffer of two to three months of survival floor on top of the required runway. This buffer absorbs the normal randomness of life without drawing from the runway you need intact for the business building period.

A medical expense. A car repair. An unexpected family need. These are not edge cases. They are normal life events that occur during every twelve-month period. The buffer exists so they do not shorten your runway when they arrive.

Emergency Fund Before Starting a Business: How Much Is Enough covers the structure of this buffer separately from the runway in more detail.

The Complete Formula

Here is the full calculation in a single sequence.

Calculate survival floor. Calculate liquid savings. Divide savings by survival floor for raw runway. Subtract monthly side income from survival floor for net draw. Divide savings by net draw for adjusted runway. Identify required runway for your business model. Add two to three months of survival floor as emergency buffer. Compare adjusted runway to required runway plus buffer.

If adjusted runway is equal to or greater than required runway plus buffer: the financial condition for leaving is met.

If adjusted runway is less than required runway plus buffer: calculate the monthly savings rate required to close the gap and the number of months at that rate before the condition is met.

This second number, the months until the condition is met, is your real timeline. Not a guess. A calculation.

What This Number Tells You

The calculation produces clarity where most people have had vague discomfort.

If the number says you can leave now, you have the financial answer you needed. The decision is no longer about whether you can afford to. It is about whether you are ready and whether the preparation is in place.

If the number says you need eight more months of saving, you have a specific target and a specific timeline. Eight months of deliberate preparation with a known destination is psychologically very different from indefinite waiting with a vague sense that the savings are not yet enough.

The calculation does not make the decision for you. It removes the financial uncertainty from the decision so you can make it clearly. That is what it is for.

The 6-Month Financial Exit Plan builds this calculation into a month-by-month action plan for the preparation period. How Much Money Do You Actually Need Before You Quit Your Job covers the same foundational calculation with additional context on the variables.

Do the calculation once this week. You will know more in an hour than most people know after years of wondering.

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FAQ

Q1: How do you calculate if you can afford to quit your job? Calculate your survival floor, the minimum essential monthly expenses only. Divide your liquid savings by that number for raw runway in months. Subtract any monthly side income from the survival floor, then divide savings by the reduced figure for adjusted runway. Compare the adjusted runway to the required runway for your business model plus a two to three month emergency buffer. If adjusted runway meets or exceeds that total, the financial condition for leaving is met.

Q2: What is a survival floor and why does it matter for the quit calculation? Your survival floor is your minimum essential monthly expenses with nothing optional included. It is the denominator in the runway calculation. Using current spending rather than the survival floor produces an overly conservative runway figure because current spending includes a large amount of optional expense that would naturally compress in a genuine lean period. The survival floor gives you the actual number of months your savings can sustain you.

Q3: How long a financial runway do you need before quitting your job? It depends on what you are building. Service businesses and freelancing require six months minimum. Digital products require eight to twelve months. Newsletters and subscription models require twelve to eighteen months. SaaS requires twelve to twenty-four months. Add two to three months as an emergency buffer on top of the model-specific requirement.

Q4: Does side income change how much savings you need to quit? Significantly. Monthly side income reduces the net draw on savings each month, which means the same savings cover a longer period. Someone with 500 dollars per month in side income and a 1,500 dollar survival floor has a net draw of 1,000 dollars. The same 18,000 dollars in savings covers eighteen months rather than twelve. Building the income bridge before leaving is one of the highest-leverage preparations available.

Q5: What if the calculation says you cannot afford to quit yet? The calculation gives you a specific gap and implicitly a specific timeline. If the required runway plus buffer is twenty months and your adjusted runway is twelve, you need eight more months of equivalent saving or income bridging. That is a defined preparation period with a known target, not indefinite waiting. Plan the eight months and work the plan.