The resignation email is sitting in your drafts folder, right next to a note that says “how much do I save before quitting my job?” (Don’t worry, I won’t tell.) You’ve pictured the first Monday that belongs to you: the coffee you’ll drink slowly, the clients you’ll finally have time for.
And then the other voice pipes up: what if it’s too soon?
That voice isn’t proof you’re not ready. It’s proof you’re smart enough to want a number instead of a pep talk. So let’s get you a number.
Short answer: You need enough money to cover the gap between what your life costs and what your business reliably brings in, for as many months as it will realistically take the business to close that gap, plus your setup costs and a cushion. I call that number your leap target. For most people it’s bigger than “six months of expenses,” because your paycheck quietly pays for things your salary doesn’t show.
Should I save six months of expenses before quitting my job?
Sometimes, but it’s a rule of thumb built for an average life, not yours. It ignores what your employer pays on top of your salary, how fast your business ramps up, and what happens if that ramp is slow.
Six months of expenses is an emergency-fund rule. It was designed to carry you from one job to the next, not to fund a business from a standing start, with its own costs, taxes and timeline.
I’ve worked at start-ups that folded and at a company whose payroll checks bounced, so I know a job isn’t the zero-risk option it pretends to be. But it does hand you a predictable deposit on payday. When you leave, making that deposit predictable becomes your job, and your leap target funds the months while you learn how.
What does my paycheck pay for that I’m not counting?
More than your salary. Your employer quietly covers a bundle of costs that become yours the moment you leave, and if you don’t count them, you’ll save too little before quitting your job.
The Paycheck Unbundle
Before you calculate anything, pull your job apart like a bento box and look at what’s sitting in each compartment.
| What your job covers now | What it becomes after you leap | How to put a number on it |
|---|---|---|
| Part of your health insurance premium | Your whole premium (COBRA, a marketplace plan or a partner’s plan) | Get real quotes before you give notice, not after |
| Half of your Social Security and Medicare tax | All of it, as 15.3% self-employment tax on most of your net earnings | Ask your CPA for a tax set-aside that fits your situation |
| A retirement match | Your own contributions, with no match | Decide what you’ll keep contributing each month |
| Paid vacation, holidays and sick days | Days off that pay you nothing | Plan for lighter months, or price your time off into your rates |
| Your laptop, software, phone, internet and training | Business expenses | List them as one monthly number |
| A predictable deposit | Income that arrives when clients pay | Decide on a steady amount you’ll pay yourself |
None of these are luxuries. They’re the floor your job built under you without asking. The Paycheck Unbundle just asks you to build it on purpose, before you need to stand on it.
How do I calculate what to save before quitting my job?
Work out your true monthly need, subtract what your business reliably brings in after taxes, multiply that gap by your realistic ramp-up months, then add your setup costs and a cushion. Here’s the order I’d do it in:
- Find your true monthly need. Start with your current personal spending, trimmed to what you’d honestly keep (a real budget, not a punishment). Then add the unbundled costs from the table.
- Find your reliable business take-home. Average the last six months of side-business profit, not your best month, and subtract a tax set-aside. What’s left is money you can actually spend.
- Find the monthly gap. True monthly need minus reliable take-home.
- Choose your ramp months. How many months, honestly, until the business could cover your full need? If you’re torn between two answers, choose the longer one.
- Multiply the gap by your ramp months. That’s the runway itself.
- Add one-time leap costs. The website refresh, the new laptop, business insurance, the LLC paperwork.
- Add a landing cushion. Enough to cover a calm job search if you ever decide the leap isn’t for you. Not because you’ll fail. Because knowing you could land softly makes you braver in the meantime.
I’m not your CPA or financial planner, so please run your tax set-aside, your insurance choices and where you keep this money by one. This is planning math, not investment advice.
A worked example: meet Rosa
Let’s say you’re Rosa, a hypothetical marketing manager with a side business designing email newsletters for small brands. She wants to know how much to save before quitting her job, so she starts with her true monthly need:
- Personal spending she’d keep: $4,000
- A marketplace health insurance quote: $600 (real quotes depend on your state, age and plan)
- Retirement contributions she wants to keep making: $300
- True monthly need: $4,900
Her side business has averaged $1,200 a month in profit over the last six months. Let’s say her CPA suggests setting aside 30% for taxes in her situation, which leaves a reliable take-home of $840.
- Monthly gap: $4,900 minus $840 is $4,060
- Ramp months: she decides nine is honest
- Runway: $4,060 × 9 is $36,540
- One-time leap costs: $2,500 for a laptop, a website refresh and business insurance
- Landing cushion: two months of true need, $9,800
Rosa’s leap target: about $48,840.
Six months of expenses, for Rosa, would have been $24,000: roughly half of what she needs. If she’d leapt on the rule of thumb, she wouldn’t have run short for lack of talent. She’d have run short because the rule was built on someone else’s life.
Notice what I did with business growth: nothing. Rosa’s plan assumes her side business stays flat. If it grows (and with full-time attention, it probably will), the growth shortens her runway instead of rescuing it. I’d so much rather you be pleasantly surprised in month five than quietly panicking.
How many months should I save before quitting my job?
As many as it will realistically take your business to cover your true monthly need, plus a cushion. The best way to estimate that is your own evidence, not a generic number.
Look at these before you choose your ramp months:
- Your sales cycle. How long did your last three clients take to go from first conversation to paid invoice?
- Your demand. Are you turning work away right now, or will the extra hours mostly go into finding people?
- Your seasons. Look at twelve months of income, not your best quarter.
- Your concentration. If one client is half your income, plan as if that client could leave. (They’re lovely. Plan anyway.)
The more of your future income already exists as signed work or repeat customers, the shorter your runway can be. The more of it lives inside “once I have more time, I’ll finally…”, the longer it should be.
Should I quit before my side business replaces my income?
You can, as long as your leap target covers the gap. Covering the gap while the business grows is exactly what a runway is for.
Waiting for a full match sounds safe, but it often means working two full-time jobs until something breaks (usually you). Some people need that level of proof to sleep at night, and that’s valid. Others leap with a funded runway and use the freed-up hours to grow faster. Neither is braver. One is just a better match for you.
Beyond the money, signs you’re closer than you think:
- You’ve sold the thing you plan to sell, to strangers, more than once.
- You can name where your next few clients are likely to come from.
- You’ve told one honest person your leap target and your timeline.
- You can picture a slow month without picturing yourself crying in the car.
Try this today (20 minutes)
- Open your last three months of bank statements and highlight what you’d keep paying if you left.
- Go row by row through the Paycheck Unbundle and write a monthly number next to each. A guess is fine. A quote is better.
- Add it all up. That’s your true monthly need.
- Divide the savings you’ve set aside for this leap by your true monthly need.
That’s how many months you could live today with zero business income. It’s not a verdict. It’s a starting line.
Let the math hold the worry for you
I built Runway to Leap for exactly this moment. It’s free, and it works out your leap target (how much you need before leaving your 9-to-5) and how many months of runway you already have. “Am I ready?” becomes “how many more months?”, which is a much kinder question to live with.
Run it today, then again every few months. Watching the gap shrink is wildly motivating.
Quick answers
How much money should I save before quitting my job to start a business?
Save enough to cover the monthly gap between your living costs and your business’s reliable after-tax income, multiplied by the months it will realistically take your business to close that gap. Then add one-time setup costs and a cushion. That total is your leap target, and it’s usually more than six months of expenses.
Is six months of savings enough to quit my job?
Six months of savings can be enough, but only if your business already brings in steady income and your budget includes everything your job used to cover. The six-month rule was built for job loss, not for starting a business. Calculate your own runway from your true monthly need, your business income and your realistic ramp-up time.
What is a leap target?
A leap target is the amount of money you need before leaving your 9-to-5 to start or grow a business. It covers the gap between your true monthly need and your business income for your realistic ramp-up months, plus one-time leap costs and a landing cushion. It turns “am I ready?” into a number you can save toward.
What costs should I save for before quitting my job?
Commonly forgotten costs include the employer’s share of health insurance, the employer’s half of Social Security and Medicare tax, retirement matching, paid time off and work equipment. When you’re self-employed, you pay 15.3% self-employment tax on most of your net earnings, and vacation days earn nothing. Count all of these before quitting your job.
Should I wait until my side hustle matches my salary before quitting?
You don’t have to wait until your side hustle matches your salary. If your savings cover the gap between your true monthly need and your side hustle’s after-tax income for your realistic ramp-up period, you can leap sooner. Waiting for a full match is a valid choice, but it often means working two jobs for a long time.
You’re not scared because you’re unready. You’re scared because this matters. Give that fear a number to hold, and watch how much quieter it gets.