Tax-Efficient Investing

What creates a taxable event

In a taxable account, tax generally follows an event rather than a paper gain.

• Selling at a gain realises a capital gain
• Dividends and interest are generally taxable when received
• Fund distributions can be taxable even if you did not sell
• Unrealised gains on something you still hold are generally not taxed

Holding period

In the U.S., gains on assets held beyond one year are generally taxed at long-term capital gains rates, which are typically lower than short-term rates that apply to shorter holdings.

This is one more structural reason frequent trading is expensive: the tax treatment itself is worse.

Cost basis and records

Cost basis is generally what you paid for a holding, including purchase costs such as commissions. Adjusted basis is that figure after later changes the IRS recognises — for example, a stock split spreads the same basis across more shares. The taxable gain on a sale is the sale proceeds minus adjusted basis.

Each reinvested dividend buys a new lot with its own basis and date. Simplified U.S. example (hypothetical): you buy 10 shares for $1,000 plus a $5 commission (basis $1,005), then a $40 dividend — taxed that year — buys 0.4 shares (basis $40). Total basis is $1,045. Selling everything for $1,300 gives a $255 gain, not $300; forgetting the reinvested lot would mean paying tax twice on the $40.

Gifts and inherited assets follow different basis rules (for example, inherited property generally uses its value at the date of death). Check the IRS rules or a professional for those cases.

Not tax advice

Rules vary by country, change over time and depend on your circumstances. Consult a qualified tax professional.

Allocation, location, and gross vs. after-tax

Asset allocation is what you own, such as 60% stock funds and 40% bond funds. Asset location is which account holds each piece. With the same allocation, location can change how much tax is paid along the way.

Unrealised appreciation is a rise in value on something you still hold; it is generally not taxed yet. A realised capital gain happens when you sell for more than your adjusted basis; in a U.S. taxable account that sale is generally taxable. Interest and most dividends are generally taxable in the year received, even if nothing is sold.

Simplified U.S. example (hypothetical; assumes a taxable account, a 20% tax on the gain, no state tax, no fees): $10,000 grows to $11,000, a 10% gross return. If you keep holding, the $1,000 is unrealised and no tax is due yet. If you sell, tax is 20% × $1,000 = $200, leaving $10,800: an 8% after-tax result. In a tax-deferred account the same sale would generally not be taxed now, but later withdrawals are generally taxed as ordinary income; in a Roth account, qualified withdrawals are generally tax-free.

Exceptions and limits: actual rates depend on income, holding period (more or less than one year), filing status and state; qualified dividends and interest are treated differently; contribution limits and thresholds change each year, so check the current IRS figures rather than a number printed in a lesson. There is no single best account order for everyone: it depends on current versus expected future tax rates, when the money is needed, withdrawal rules, and employer plans. This is general education, not tax advice; for a specific situation, use current IRS guidance or a qualified tax professional.