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Margin Interest — Smart Financial Analysis

Calculate interest on margin loans. Compare broker rates, see leveraged returns, and understand the true cost of borrowing to invest.

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Margin interest is the cost charged by your broker when you borrow money to buy securities. Margin Interest = Amount Borrowed × (Annual Rate / 100) × (Days / 360). Interactive Brokers and Robinhood offer the lowest rates (5.5-5.83%). Margin interest is charged on brokerage margin loans used to buy securities.

Key figures
Core Concept
Margin Interest
Investments fundamental
Benchmark
Industry Standard
Compare your results
Proven Math
Formula Basis
Established methodology
Expert Verified
Best Practice
Professional standard

Ready to run the numbers?

Why: Margin interest is the cost charged by your broker when you borrow money to buy securities. Rates typically range from 5.5% (Interactive Brokers, Robinhood) to 12%+ at tradition...

How: Enter Amount Borrowed ($), Annual Interest Rate (%), Number of Days to get instant results. Try the preset examples to see how different scenarios affect the outcome, then adjust to match your situation.

Margin interest is the cost charged by your broker when you borrow money to buy securities.Margin Interest = Amount Borrowed × (Annual Rate / 100) × (Days / 360).
Sources:InvestopediaFederal Reserve

Run the calculator when you are ready.

Calculate Margin InterestEnter your values below

📋 Quick Examples — Click to Load

Margin loan amount
Broker margin rate
%
Loan period
Your own capital (for leveraged scenarios)
margin_interest_analysis.shCALCULATED
Total Interest
$4,056
Daily Interest
$11
Monthly Interest
$333
Annual Interest
$4,000
Leveraged Return (15% Gain)
18.5%
Leveraged Loss (15% Drop)
26.5%

📊 Margin Rates by Broker

Compare typical margin rates across major brokers

📈 Leveraged vs Unleveraged Returns

Amplification effect of 50% margin on portfolio returns

📉 Interest Cost Over Time

Cumulative interest accrual based on your inputs

🍩 Portfolio Breakdown

Your equity vs margin loan composition

For educational purposes only — not financial advice. Consult a qualified advisor before making decisions.

💡 Money Facts

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Margin Interest analysis is used by millions of people worldwide to make better financial decisions.

— Industry Data

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— NBER Research

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Margin interest is charged on money borrowed from your broker to buy securities. Rates range from 5.5% (Interactive Brokers, Robinhood) to 12%+ (traditional brokers). Interest accrues daily: Daily Rate = Annual Rate / 360. On $50K margin at 8%, you pay ~$11/day or $4,000/year. Margin amplifies BOTH gains AND losses. A 15% gain on $150K (with $50K margin) = 19% return on your equity — but a 15% loss = 26% loss on equity. Margin interest is potentially tax-deductible as investment interest expense (up to net investment income). Reg T requires 50% initial margin; maintenance margin is typically 25-30%.

8%
Average Margin Rate
$4K/yr
Interest on $50K Margin
19%
Leveraged Return (15% Gain)
26%
Leveraged Loss (15% Drop)

Sources: FINRA, SEC, Interactive Brokers, NerdWallet.

Key Takeaways

  • • Margin interest accrues daily; most brokers use a 360-day year for calculation
  • • Rates vary 5.5% to 12%+ — shop brokers to save $1,000+ annually on large loans
  • • Leverage amplifies gains and losses: 50% margin doubles your return (and risk)
  • • Margin interest may be tax-deductible as investment interest (up to net investment income)

Did You Know?

🔢 Reg T requires 50% initial margin — you need $50K equity to borrow $50K
📊 Interactive Brokers often offers the lowest margin rates (5.5%+)
💡 Daily rate = Annual Rate ÷ 360 — $50K at 8% = ~$11.11/day
🌍 Margin calls can force liquidation — brokers may sell without notice
📈 A 15% gain with 50% margin = 19% return on your equity
🎯 Break-even: your investments must outperform the margin rate to profit

How Does Margin Interest Work?

Daily Accrual

Interest is calculated daily on your closing margin balance. Daily Rate = Annual Rate / 360. Most brokers bill monthly.

Tiered Rates

Larger margin loans often get lower rates. Fidelity charges 11%+ for under $50K but 6.9% for $1M+.

Maintenance Margin

Brokers require 25-30% equity. If your account falls below this, you'll get a margin call requiring immediate deposit or liquidation.

Expert Tips

Shop for the best rate — Interactive Brokers and Robinhood often beat traditional brokers by 4-6 percentage points.
Keep margin usage below 20-30% of portfolio value to maintain a safety buffer against margin calls.
Only use margin when expected returns exceed the interest rate — otherwise you're paying to lose money.
Consider tax deductibility: margin interest for taxable investments may reduce your tax bill.

Margin Rates by Broker ($50K Loan)

BrokerRateAnnual Interest
Interactive Brokers5.83%$2,915
Robinhood5.75%$2,875
Fidelity8.25%$4,125
E*TRADE12.70%$6,350

Frequently Asked Questions

What is margin interest?

Margin interest is the cost charged by your broker when you borrow money to buy securities. Rates typically range from 5.5% (Interactive Brokers, Robinhood) to 12%+ at traditional brokers. Interest accrues daily: Daily Rate = Annual Rate / 360. On $50K margin at 8%, you pay ~$11/day or $4,000/year.

How is margin interest calculated?

Margin Interest = Amount Borrowed × (Annual Rate / 100) × (Days / 360). Most brokers use a 360-day year. Example: $25,000 at 8% for 365 days = $25,000 × 0.08 × (365/360) = $2,028 in interest.

What are margin interest rates by broker?

Interactive Brokers and Robinhood offer the lowest rates (5.5-5.83%). Fidelity and Schwab charge 8-11%+. E*TRADE and Vanguard often exceed 10%. On $50K margin, the difference between the cheapest and most expensive broker can exceed $2,000 per year.

Margin interest vs loan interest: what's the difference?

Margin interest is charged on brokerage margin loans used to buy securities. It's similar to a personal loan but secured by your portfolio. Unlike a mortgage, margin can be called at any time if your equity falls below maintenance requirements. Rates are typically variable and tied to benchmark rates.

Is margin interest tax deductible?

Margin interest may be deductible as investment interest expense (Schedule A) up to your net investment income. Interest used for taxable investments qualifies; interest for tax-advantaged accounts generally does not. Consult a tax professional for your situation.

What are the risks of margin trading?

Margin amplifies both gains and losses. A 15% stock drop with 50% margin = 26% loss on your equity. Margin calls force you to deposit funds or face forced liquidation. Interest accrues regardless of performance — you must outperform the margin rate to profit.

Key Statistics

8%
Average Margin Rate
$4K/yr
Interest on $50K
19%
Leveraged 15% Gain
26%
Leveraged 15% Loss

Official Data Sources

FINRA ↗
Margin rules and investor protection
SEC ↗
Regulation T and margin requirements
Interactive Brokers ↗
Margin rate schedules
NerdWallet ↗
Broker margin rate comparisons

⚠️ Disclaimer: This calculator is for educational purposes only. Margin rates vary by broker and account size. Actual interest may differ based on daily balance changes and broker-specific terms. Not financial advice. Consult a professional before using margin.

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