CoastFIRE for Small Business Owners
By Minh · Updated 2026-04-25 · 5 min read
Small Business Owners have a specific CoastFIRE setup: typical incomes around $110,000, and primary tax-advantaged accounts in the Solo 401(k), SEP, or Defined Benefit Plan family. This guide walks through what those numbers look like and how a no-pension career changes the math.
High-earning S-Corp owners can layer a Defined Benefit Plan on top of a Solo 401(k) and shelter $200k+ per year from taxes — a CoastFIRE accelerant most miss.
CoastFIRE at Age 35 for a Typical Small Business Owner
$381,773
Based on $110,000 income, 60% replacement ratio, 5% real return
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CoastFIRE Numbers by Age for Small Business Owners
| Age | Years to 65 | CoastFIRE Today |
|---|
| 25 |
40 |
$234,375 |
| 30 |
35 |
$299,129 |
| 35 |
30 |
$381,773 |
| 40 |
25 |
$487,250 |
| 45 |
20 |
$621,868 |
| 50 |
15 |
$793,678 |
The table assumes your retirement spending is 60% of your current income (~$66,000/yr) and a 5% real return on investments.
Account Strategy for Small Business Owners
Small Business Owners typically have access to Solo 401(k), SEP, or Defined Benefit Plan. Here's the priority order most fee-only planners recommend:
- Employer match first — contribute enough to capture every match dollar. This is a guaranteed return that beats every other investment.
- Max a Roth IRA if eligible ($7,000/yr in 2026; $8,000 if 50+). Income limits: phase out at $150–165k single / $236–246k MFJ in 2026.
- Max your primary workplace plan ($23,500 in 2026 for Solo; $31,000 if 50+).
- Mega-backdoor Roth if available — total 401(k) limit is $70,000 in 2026 (employee + employer + after-tax). The after-tax portion can be converted to Roth.
- HSA if on a high-deductible plan — triple tax-advantaged, $4,300 single / $8,550 family.
- Brokerage for everything beyond that — taxable, but flexible, no contribution limits, and LTCG rates (15% for most) are friendlier than ordinary income.
What Could Go Wrong
- Job change before vesting — leaving a 401(k) match table on the table when you switch jobs.
- Lifestyle inflation as income grows — a $30k raise can become $30k of extra spending if you're not intentional.
- Disability or income loss — own-occupation disability insurance is non-negotiable for small business owners who depend on a specific skillset.
- Sequence-of-returns risk in early retirement — a 30% drop in year 1 of retirement can permanently impair your portfolio if you don't have a cash buffer.
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Frequently Asked Questions
What's a realistic CoastFIRE number for small business owners?
At a typical income of $110,000 and assuming 60% income replacement in retirement, the CoastFIRE number for a 35-year-old is approximately $381,773. The full table above shows other ages.
Should small business owners prioritize Solo 401(k), or Roth IRA?
Capture employer match first (free money), then prioritize Roth IRA at lower incomes (under $100k single / $200k MFJ) for tax-free growth. Above those incomes, the deduction in a Traditional Solo usually wins. Mega-backdoor Roth (if available) is the gold-standard top-up.
Without a pension, do I need to save more?
Compared to pension-eligible careers, yes — your portfolio has to do all the heavy lifting. The flip side: no vesting cliffs, full portability when you switch jobs, and your money is yours regardless of employer drama.
What's the biggest CoastFIRE mistake for small business owners?
High-earning S-Corp owners can layer a Defined Benefit Plan on top of a Solo 401(k) and shelter $200k+ per year from taxes — a CoastFIRE accelerant most miss.