In late 2023 I quit a salaried job to write full-time. I had been side-writing for about eighteen months by then. The side income had crossed the threshold I had decided in advance was my "quit number." I quit. Within six weeks I realized I had calculated the quit number wrong, in three specific ways. The income covered the rent; it did not cover the new costs I had not added up.
This is not a regret piece. I am still writing full-time and would not go back. But I would have given myself a six-month longer runway if I had run this math more honestly the first time. Here is the version I wish I had.
Replacing the salary
The naive comparison is gross salary to gross self-employed revenue. My salary was $86,000. My side writing in the year before I quit grossed $54,000. So the deficit, on paper, was $32,000 — bridgeable, I thought, by growing the freelance book once I had full-time hours.
That comparison is wrong. The right comparison is take-home pay to take-home pay, adjusted for the cost of self-providing benefits.
The benefits gap
My W-2 job included:
- Health insurance, paid 80% by the employer ($720/month employer share)
- Dental and vision ($45/month employer share)
- 401(k) match of 4% on a 5% contribution ($3,440/year)
- 15 days PTO, 8 sick days, 11 holidays — a "real" working year of about 226 days
- Short- and long-term disability insurance ($28/month employer-paid)
- $50,000 of basic life insurance ($14/month employer-paid)
Annualized employer cost of those benefits, excluding the PTO conversion: $12,564. That is roughly 14.6% of my gross salary, which is in the normal range for US white-collar work.
Self-providing them in 2024 cost me:
| Benefit | My cost |
|---|---|
| Marketplace health plan (Silver, single, NY) | $680/month |
| Marketplace dental | $32/month |
| SEP-IRA contribution (lost match income) | $0 employer + foregone $3,440 |
| Disability insurance (own policy) | $78/month |
| Term life policy | $22/month |
| Annualized | $13,584 + $3,440 foregone |
The cash cost of benefits I had been getting for nothing was about $17,000 a year. That is the first hidden line in any quitting math.
The self-employment tax surprise
This is the line that bit me hardest. On a W-2 paycheck, the employer pays half of FICA (Social Security + Medicare) — 7.65% — and you pay the other half. On self-employment income, you pay both halves, which is 15.3% on net earnings, up to the Social Security cap. You get to deduct half of it on your income tax, which softens the blow a little but does not eliminate it.
On $54,000 of side income, my self-employment tax was about $7,630. That number had not existed on my W-2 paystubs because the employer side was paid invisibly. Going from a $86k W-2 with employer-side FICA paid for me, to $54k of self-employed income with both sides on me, meant the comparable take-home gap was much wider than the gross numbers suggested.
The first surprise of self-employment is that the IRS bills you for taxes your employer used to pay quietly. They are not new taxes. They were always there. They just become visible.
Runway you actually need
The rule I have come to: before quitting, you want 12 months of barebones expenses in cash, plus enough additional savings to cover the benefits gap for that 12-month period.
For me, in 2023, that worked out to about $52,000 of barebones living plus $17,000 of benefits — call it $70,000 of true runway. I quit with $44,000 in liquid savings. That was enough that I survived, but the cushion eroded faster than I had projected, and by month seven I was making writing decisions partly to keep the cash flow up rather than to build the book I wanted. That is the lived cost of underbudgeting runway.
If I were doing it again, I would also keep an emergency-fund tier separate from quitting runway. Quitting runway is for living through a planned transition; the emergency fund is for the surprise inside the transition — a burst pipe, a dental issue, an unforeseen tax bill. These need to be separate pots.
Five questions to answer before you quit
- Has the side income been at 60% or more of net-of-benefits salary for at least six consecutive months? Six months filters out flukes; 60% accounts for the benefits gap.
- Is the side income from at least three different clients? Single-client risk is enormous and rarely accounted for. If 70% of your side revenue is one client, you do not have a business; you have a contract.
- Do you have 12 months of barebones runway, including the benefits gap? Not 3. Not 6. Twelve.
- Have you priced an individual marketplace health plan for your zip code, age, and family size? The number will be larger than you assume. Healthcare.gov has a price-check tool that takes five minutes.
- Are you running a real business or a glorified hobby? A real business has a billing system, a contract template, an accountant or bookkeeping system, and a separate bank account. A hobby has a Venmo handle. The friction of becoming a real business catches most people in their first six months.
If you can answer yes to all five, the math probably works. If you cannot, it might still work — quitting before you are mathematically ready is sometimes the right call, and the only reason I made the transition I did is that I underestimated how hard the first year would be and then dragged it across the line by sheer momentum. But you should at least know which line you are crossing. I did not, fully, and the surprise nearly turned me back.
