Business Owner Retirement Readiness Calculator

Most retirement calculators assume you have a portfolio of stocks and bonds. If you're a business owner, your biggest asset is the business — and you can't retire until it sells. This calculator answers the real question: how much does your business need to sell for, combined with your current savings, to retire on your terms?

Enter your situation. The calculator models your after-tax sale proceeds, projects your full retirement portfolio, and tells you whether your income goal is covered — or shows you the minimum sale price you need to close any gap.

Why Business Owner Retirement Planning Is Different

For a W-2 employee, retirement planning follows a predictable arc: contribute to a 401(k), add a brokerage account, project the balance, apply a withdrawal rate. For a business owner, you have one additional — often dominant — variable that generic calculators ignore: the day your business sells.

The critical insight: most business owners have 50–90% of their net worth in a single illiquid asset. Until that asset converts to cash via a sale, ESOP, or succession, the retirement portfolio calculation is incomplete. Two planning challenges most generalist advisors miss:

• Tax drag on the sale. A $3M business sale with $300K basis creates $2.7M of capital gain. At the 20% federal rate + 3.8% NIIT, you lose a significant portion before the money even hits your account. The retirement math only works on what lands in your pocket — not the headline sale price.
• Concentration and timing risk. If you plan to retire at 65 and the business represents 80% of your net worth, a recession that cuts multiples by 40% right when you want to exit can derail the plan entirely. Building non-business assets in parallel is essential to a resilient retirement.

What the 4% Rule Means for Business Owners

The "4% rule" — withdraw 4% of your initial retirement portfolio annually, adjusted for inflation — originated with financial planner William Bengen in 1994 and has been widely studied since. It is calibrated for a broadly diversified stock/bond portfolio over a 30-year retirement. For business owners, a few nuances apply:

• Retirement before 60. A 35+ year retirement requires a lower withdrawal rate. Use 3.25–3.5% to reduce sequence-of-returns risk in a longer horizon.
• Social Security as a hedge. If Social Security covers a meaningful slice of your income need, you can afford a higher withdrawal rate from the portfolio. Model SS separately and reduce the portfolio income requirement before applying the rule.
• Post-sale portfolio construction. A business owner who just sold faces a unique challenge: going from a fully concentrated illiquid position to building a diversified portfolio from scratch in a single event. Sequence-of-returns risk in the first 3–5 years post-sale is significant. Dollar-cost average the sale proceeds into the market rather than deploying all at once. See our post-sale financial roadmap.

Strategies That Close the Gap Before You Sell

The difference between your gross sale price and after-tax retirement cash is not fixed. Strategies verified for 2026 rules that reduce the gap:

• QSBS (IRC §1202): Qualifying C-corp stock held 5+ years can exclude up to $15M of gain from federal tax (post-OBBBA, tiered: 50% at 3yr, 75% at 4yr, 100% at 5yr). A $5M gain on qualifying stock held 5+ years could cost $0 in federal LTCG tax. QSBS eligibility guide
• §453 Installment Sale: Spreading gain over 5–10 years keeps each year's recognized gain in the 15% bracket instead of 20%, reducing both LTCG and NIIT. Model your installment sale
• ESOP (§1042): C-corp owners selling 30%+ to an ESOP can defer capital gains indefinitely by reinvesting in qualified replacement property. S-corp 100% ESOP-owned companies pay no federal income tax. ESOP guide
• Charitable Remainder Trust (Flip CRUT): Contribute the business to a CRT pre-sale — the trust sells with no capital gain, you receive a lifetime income stream, and you get a charitable deduction. CRT guide
• Maximize retirement plan contributions pre-sale: In the 5–10 years before your exit, maxing out a Solo 401(k) + Cash Balance Plan can shelter $150K–$400K/yr in tax-deferred savings. This both reduces current-year income taxes and builds non-business retirement assets that grow independently of the sale. See how much you can contribute

1. Kiplinger: IRS Updates Capital Gains Tax Thresholds for 2026 — 2026 LTCG bracket thresholds: 0% ceiling $98,900 MFJ / $49,450 single; 20% floor $613,700 MFJ / $545,500 single; per IRS Rev. Proc. 2025-32.
2. IRS Topic 559: Net Investment Income Tax — 3.8% NIIT on the lesser of net investment income or MAGI above $250,000 MFJ / $200,000 single (thresholds not indexed for inflation, per IRC §1411).
3. IRS Q&A: Net Investment Income Tax — capital gains from business sales included in NII; active trade or business income excluded.
4. Kitces: Revisiting the 4% Rule — Bengen research methodology, 30-year calibration, and adjustments for longer retirements.

Tax values verified June 2026 against IRS Rev. Proc. 2025-32. NIIT thresholds per IRC §1411 (not inflation-adjusted). Retirement projections use simplified future-value formulas and the 4% safe withdrawal rate; they are illustrative planning estimates only. Actual results depend on investment returns, inflation, exit structure, tax rates, and factors not captured in this model. This is not financial, tax, or legal advice — consult qualified professionals before making retirement or exit planning decisions.