Reinvesting Profits: Make the Business Pay You
Profit can be reinvested in the business, paid to owners, used to pay down debt, or invested outside the business. Each is a capital allocation decision with an opportunity cost.
Return on invested capital (ROIC) measures how much operating profit a dollar of investment produces. If a new $20,000 van produces $8,000 a year in extra profit, its simple return is 40%.
Payback period is how long it takes to earn back the investment. $20,000 ÷ $8,000 = 2.5 years. Shorter paybacks carry less risk.
Owners should also build wealth outside the business. Diversifying into index funds or property protects your family if the business has a bad year.
A simple rule many operators use: keep a cash reserve, reinvest in projects that clearly beat outside returns, and move the rest into personal investments.
You, what's one investment in your business that could pay itself back in under three years?
Learning objective
Rank reinvestment options against outside alternatives using return and payback.
Understand the mechanism
Profit has competing uses. ROIC and payback convert options into comparable numbers.
The opportunity cost of reinvesting is the outside return you give up.
Put it to work
List three uses for $10,000 of profit and calculate return and payback for each.
Worked example
- 1
Option A: new equipment $10,000 → $3,000/year: 30%, 3.3-year payback.
- 2
Option B: marketing test $10,000 → $1,500/year: 15%, 6.7 years.
- 3
Option C: index fund ~7–10% historical average, liquid.
Fund A, test B smaller, and invest any excess.
Your practice lab
You have $30,000 profit and two months of reserves. A $15,000 machine adds $6,000/year. What would you do with the full $30,000?
Personal scratchpad · not graded or saved
The Bakery's Second Oven
A bakery turned away wholesale orders every week. A $12,000 second oven would let it fill them for about $6,000 a year in profit.
With a two-year payback, the owners bought the oven and moved half of the next year's extra profit into a retirement account.
Good reinvestment pays for itself and then funds personal wealth.
Illustrative example — names and figures are composites for teaching.
Write your profit allocation rule: reserve %, reinvest %, owner pay %, outside investing %.
Example: 20% reserve, 40% reinvest, 25% owner pay, 15% index funds.
Go deeper — outside resources
- SBA — Plan your business · U.S. Small Business Administration
- Investor.gov — Introduction to investing · U.S. SEC
Key ideas
- Every profit dollar has four jobs
- ROIC and payback rank investments
- Build wealth outside the business too
Try it: Pick one possible investment in your business and calculate its return and payback.
Quick check
1. A $20,000 van adds $8,000/year profit. What's the simple return?
2. What's the payback period for that van?
3. What does ROIC measure?
4. Why invest outside the business too?
5. When should a project get reinvested profit?