Definition
Position sizing is the process of choosing how much of a portfolio to allocate to a holding. Income investors should measure both capital weight and income weight. A 5% position yielding 12% can provide as much income as a 15% position yielding 4%, creating more payout dependence than its capital weight suggests.
Sizing rules can use maximum capital weight, maximum income contribution, loss budgets, or a blend.
Why It Matters
A correct thesis can still damage a portfolio when the position is too large. Position limits keep one dividend cut, fund closure, issuer problem, or strategy failure from disrupting the entire income plan. They also make rebalancing decisions repeatable rather than emotional.
Example
A $200,000 portfolio holds $10,000 in an ETF yielding 12%, producing $1,200. The rest yields 4%, producing $7,600. The ETF is only 5% of capital but supplies about 13.6% of income. Both weights belong in the sizing decision.
Use the calculator to combine up to four position values and yields. Empty rows are ignored.
Common Mistakes
- Sizing solely from the headline yield.
- Ignoring positions duplicated through other funds.
- Setting a rule but never rebalancing after price changes.
- Treating every ETF as equally diversified or equally risky.
FAQ
What is the right maximum position size?
There is no universal percentage. The limit depends on diversification, liquidity, volatility, income dependence, taxes, time horizon, and the consequence of being wrong.
Should winners always be trimmed?
Not automatically. Review whether the new weight breaches the written risk limit and whether taxes or trading costs outweigh the benefit of rebalancing.
