How to build a 6-month emergency fund on a tech salary before you quit

Let me start with the number most financial advice skips past.

When people say "six months of expenses," they mean six months of your current expenses — your mortgage or rent, your food, your subscriptions, your car, your social life, your streaming services, all of it as it stands right now. That number is a reasonable starting point, but it has a structural flaw that makes it wrong for most people planning to leave a tech job: it's calculated on the assumption that your post-exit expenses will look the same as your pre-exit expenses. In almost every case, they won't. And in the cases where they're higher, the standard six-month advice will leave you short at the worst possible moment.

What follows is a framework for calculating the number you actually need — not the number that sounds reassuring, but the specific figure that means you can make your next decision from clarity rather than from the quiet anxiety of a dwindling account.

Step one: calculate your real post-exit expenses, not your current ones

The first move is to separate two questions that most runway advice conflates. What do you spend now? And what will you spend after you leave?

These are often significantly different. Some of your current expenses are tied to the job and will disappear: the commute, the work wardrobe, the expensive lunches, the decompression spending that high-stress jobs generate (the online shopping at 11pm, the restaurant meals that are really about not having the energy to cook, the gym membership you use as stress management and would actually cancel if work were less demanding). Many people discover, when they itemise this honestly, that job-tied spending represents fifteen to thirty percent of their total monthly outgoings. That spending largely evaporates when the job does.

Other post-exit expenses will be higher than your current baseline. This is the category that catches people off guard and that standard runway calculators almost never account for.

If you're in the US and have been on employer-sponsored health insurance, individual coverage will be significantly more expensive — sometimes three to four times more, depending on your location, age, and coverage level. This is one of the most reliably underestimated costs in career transition planning, and it warrants a specific line item calculated against actual quotes from your insurance marketplace rather than a rough approximation.

Tax treatment changes. When you're employed, income tax and social security contributions are withheld before you see the money, which creates an invisible affordability that vanishes the moment you're responsible for paying them quarterly. Self-employed people are often surprised by the size of their first estimated tax payment — not because they weren't earning, but because they'd been mentally treating gross income as available income. Budget for this before it arrives.

Professional costs — the accountant, the business insurance, the software you need to work independently — are easy to forget because as an employee they've been invisible. They become visible very quickly when you're paying them out of pocket.

Step two: decide what the runway is actually for

Six months of expenses to do what?

This question matters more than people think, because the financial requirement varies significantly depending on the answer. Six months of runway for an active job search in a sector where your skills are in demand is a very different calculation from six months of runway for freelance ramp-up (which takes longer to produce stable income than most people expect), which is different again from six months of genuine decompression with no income-generating activity at all (which requires the full six months of expenses to be covered, with no assumption of partial income to offset the burn).

Be honest about which of these you're actually planning. "I'll figure it out" is a plan, and it's a plan that requires the most runway — not the least — because unstructured time without income tends to produce anxiety that accelerates poor decisions rather than clarity that enables good ones.

Building the actual number

Here is a simple framework. It takes about an hour to run properly and produces a specific figure you can plan around.

Start with your current monthly spend. Use three months of actual bank and credit card statements, not your intuition. Most people underestimate this by 15–25% when they do it from memory.

Subtract job-tied expenses. Commute, work clothing, work lunches, decompression spending. Be honest about what's actually in this category — it's usually larger than it looks.

Add post-exit costs. Health insurance delta. Tax provision (roughly 25–30% of expected income on top of your base spending if you'll be freelancing or contracting; zero if you're doing a full decompression with no income). Accounting or professional fees. Any costs currently covered by benefits — dental, vision, life insurance — that you'll now carry directly.

That figure is your monthly burn rate. Multiply it by the number of months your plan actually requires — not six by default, but the realistic duration of whatever phase you're entering.

Add a 20% buffer on top. Not because you're being pessimistic, but because transitions take longer than planned, unexpected costs occur, and having buffer changes the quality of decisions you make. People who run their runway to zero make bad choices in the final months. The 20% buffer is what prevents that.

That's your exit number. Write it down. It will probably be larger than the figure you had in your head, and looking at it directly is better than discovering it by running short.

Where the money comes from — and how to get there faster on a tech salary

Once you have the number, the question is how to build to it. Tech salaries create specific accelerators that most general financial advice doesn't address, because most general financial advice isn't written for people earning in the top quarter of the income distribution.

Annual bonuses. If you receive an annual or quarterly bonus, and you're planning your exit for a date more than one performance cycle away, model the bonus as the primary vehicle for reaching your exit number. A single year's bonus directed entirely at the fund can represent two to four months of additional runway. This is the highest-leverage move available to most tech workers building a transition fund.

RSU vesting events. If you have a vesting schedule, model the after-tax value of upcoming vests against your target number. Some people discover that a vest event six months away makes the exit number reachable in a timeframe they hadn't previously considered. Others discover they've been mentally treating unvested equity as confirmed savings and need to revise their timeline. Either way, knowing the number precisely is better than the vague sense that equity is coming.

Expense reduction. The most unsexy but most reliable accelerator: identify the portion of your current spending that you'd happily cut if it meant getting out sooner. Subscriptions, dining, convenience spending. Many tech workers are surprised by how much of their spending is passive — monthly charges they don't actively value but haven't cancelled because cancelling takes attention they haven't had. A single afternoon of subscription audit often frees up $300–$600 per month without any quality-of-life impact.

The high-savings period. If you can identify a window of three to six months where you can direct 40–60% of your net income toward the fund, you can reach a meaningful exit number faster than a sustained moderate-savings rate would suggest. This kind of concentrated effort is psychologically easier if you have a clear target and a clear timeline — you're not cutting spending indefinitely, you're cutting it until a specific date for a specific reason.

The psychology of saving for departure

There is a specific anxiety that comes with saving for a departure you haven't announced and can't yet make. Every month you direct money toward the exit fund, you're making the departure more real — and more real tends to mean more frightening, not less. The clarity that should come with progress sometimes arrives as a new category of worry: what if I actually do this and it goes wrong?

Treat this honestly. Saving toward an exit fund is not a neutral exercise in financial prudence. It's a form of slow deciding. Every month you add to the fund, you're not quite committing but you're moving toward commitment in a way that's psychologically real even if it's practically reversible. That's useful to know — partly because it makes you more deliberate about whether you actually want to go through with it, and partly because it means you should expect the anxiety to escalate as the fund grows rather than declining. The fund approaching its target is not a signal that the fear has resolved. It's a signal that the decision is approaching.

When you hit the number: pause. Check whether you're leaving because you've decided to leave, or because you've saved enough not to have to stay. Those are similar things, but not identical. The exit fund creates the option. The decision to exercise it is separate.

The freedom number framework is a useful companion to this, if you're thinking about the decision as well as the mechanics. And the runway thinking piece covers the psychological preparation alongside the financial — because the number is only half of what you're actually building toward.