Should I wait for 100% replacement before quitting?

The common rule is 50-75% replacement PLUS six months of runway, because full-time attention usually jumps the income quickly. 100% while working evenings may be an impossible bar that keeps you employed forever.

My growth rate is zero. What does that mean?

That the hustle at its current shape has plateaued, usually a time ceiling, not a demand ceiling. The honest options: raise prices (the growth lever that costs no hours), change the model, or accept it as a side income.

What should I set up before quitting?

Health insurance quotes, the runway account funded, quarterly tax setup, and ideally one anchor client or retainer signed. Our runway and tax set-aside calculators cover the numbers half of that list.

Personal finance

Side hustle to full-time calculator

The scariest career question, turned into arithmetic: at your current side income and its growth rate, when does it replace the paycheck? A date, even approximate, beats a feeling.

Your numbers

Currency

Side income per month

Current monthly profit from the hustle, after its costs.

Monthly growth rate

Average over the last 6 months. Be honest; one good month is not a rate.

Monthly income to replace

Your take-home plus what you will now buy yourself: health insurance, retirement. The W-2 vs 1099 calculator computes the honest figure.

Results

Months to replacement15months1 year and 3 months

Side income in 12 months: $3,138
Target already covered: 25%

Estimate

workingfigures.com/calculators/side-hustle-to-full-time-calculator

The formula

Months = log(target ÷ current) ÷ log(1 + growth), rounded up. Compounding does the heavy lifting: 10% monthly growth doubles income roughly every 7 months.

What this ignores

That growth rates decay as the easy wins run out, the runway you need on top of income parity (six months of spending), and the time constraint: side hustles often plateau because evenings do, and quitting is what unlocks the growth.

FAQ

Should I wait for 100% replacement before quitting?: The common rule is 50-75% replacement PLUS six months of runway, because full-time attention usually jumps the income quickly. 100% while working evenings may be an impossible bar that keeps you employed forever.
My growth rate is zero. What does that mean?: That the hustle at its current shape has plateaued, usually a time ceiling, not a demand ceiling. The honest options: raise prices (the growth lever that costs no hours), change the model, or accept it as a side income.
What should I set up before quitting?: Health insurance quotes, the runway account funded, quarterly tax setup, and ideally one anchor client or retainer signed. Our runway and tax set-aside calculators cover the numbers half of that list.