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Unit 3

Lesson 7

Short-Term vs. Long-Term Capital Gains Tax Simulation

Last Updated: 5/18/2026
Preparation
Prep
Lesson Narrative

In this lesson, students will calculate the severe financial penalties of day-trading by simulating short-term versus long-term capital gains taxes. They will mathematically prove how holding an asset for over a year drastically reduces their tax liability. By the end of the lesson, students will understand why "buy and hold" investing is legally and mathematically superior to frequent trading.

Learning Goals

• Calculate short-term vs. long-term capital gains tax liabilities.

• Evaluate the mathematical advantage of holding investments for over one year.

• Differentiate between realized and unrealized gains.

Student Facing Learning Goals

• Let's calculate how much the government taxes our investment profits depending on how long we hold them.

Student Facing Learning Targets

• I can calculate short-term and long-term capital gains taxes.

• I can explain why day-trading is mathematically expensive.

• I can define realized versus unrealized gains.

Required Academic Standards

National Jump$tart Standards:

• Planning and Money Management (Standard 6): Understand the tax implications of financial decisions.

Glossary Entries

Capital Gains Tax: A tax on the profit made from the sale of an investment.

Short-Term Capital Gains: Profits from selling an asset held for one year or less, taxed as ordinary income at a higher rate.

Long-Term Capital Gains: Profits from selling an asset held for more than one year, taxed at a significantly lower rate.

Realized Gain: Profit that exists only after an investment is actually sold for cash.

Unrealized Gain: "Paper profit" that exists when an investment's value goes up, but it hasn't been sold yet.

Lesson
Lesson
Warm Up

3.7.1: The Paper Millionaire

Launch: Have students stand in randomized groups of 3 at vertical whiteboards. Present the prompt verbally or project it. Give them 4 minutes.

Synthesis: Select two groups to share. Establish the baseline: You only owe taxes on "Realized" gains. If you never sell, you never trigger a tax event.

Student Facing Task

You buy a stock for $100. Over five years, the app says it is now worth $1,000,000.

1. Are you officially a millionaire right now in physical cash?

2. If you never click "sell," do you owe the government any taxes on that $1,000,000 this year?

Activity 1

3.7.2: The Day Trader's Penalty

Launch: Keep students at whiteboards. Project the tax data. Give groups 8 minutes to run the calculations.

Synthesis: Have the class observe the boards. (Teacher Key: 1. 24% of $10k = $2,400. 2. 15% of $10k = $1,500. 3. Saved $900). Emphasize that the government intentionally taxes day-trading heavily to discourage market manipulation.

Student Facing Task

Investor A (The Day Trader) buys a stock and sells it 6 months later for a $10,000 profit. Because it is short-term, the government taxes it at their 24% income bracket. Investor B (The Holder) buys the exact same stock, but sells it 14 months later for a $10,000 profit. Because it is long-term, the government taxes it at 15%.

1. Calculate the exact dollar amount Investor A pays in taxes.

2. Calculate the exact dollar amount Investor B pays in taxes.

3. How much money did Investor B save just by waiting a few extra months to sell?

Activity 2

3.7.3: The "Buy, Borrow, Die" Strategy

Launch: Distribute the Mini-Project [BLM Required]. Give groups 15 minutes to model the "rich person" strategy of using a portfolio as collateral for a low-interest bank loan.

Synthesis: Facilitate a class debate. Establish the baseline: the ultra-wealthy avoid capital gains taxes by never selling their assets. They borrow against them instead.

Student Facing Task

Mini-Project: The "Buy, Borrow, Die" Strategy.

You have a $100,000 stock portfolio.

1. Calculate the value after 30 years at 6% compound interest.

2. If you sell it all, calculate the massive 15% long-term capital gains tax you would owe.

3. Instead of selling, you take out a bank loan using the stocks as collateral at a 3% interest rate. Mathematically, how does this legally avoid taxes entirely?

Lesson Synthesis

Narrative: Bring the class back to their seats. Review the student-facing learning targets. Summarize: "When you see people bragging online about day-trading and constantly flipping stocks, what massive mathematical penalty are they ignoring?" (Answer: Short-term capital gains taxes).

Cool Down

3.7.4: The 366th Day

Narrative: This exit ticket serves as a formative assessment on capital gains holding periods.

Teacher Rubric: A successful response must articulate that the 360-day mark is considered short-term, meaning it will be taxed at a much higher ordinary income rate. Waiting just one more week passes the 1-year mark, triggering the significantly lower long-term capital gains tax rate and saving them thousands of dollars.

Student Facing Task

You have a stock that has grown by $50,000. You bought it exactly 360 days ago. Mathematically, why should you wait at least one more week before clicking the "sell" button?

Assignments
Materials
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