Interactive Brokers and TD Ameritrade (now part of Charles Schwab) are two of the most popular brokerages for active traders, but they serve different audiences. IBKR is the choice for professionals, algorithmic traders, and anyone who needs global market access at the lowest cost. TD Ameritrade’s thinkorswim platform (preserved under Schwab) is the choice for traders who want professional tools with a more approachable experience. Here’s the full breakdown.

TL;DR: Interactive Brokers wins for lowest costs (especially margin and high-volume options), international market access (150+ exchanges), and professional-grade execution. TD Ameritrade (Schwab/thinkorswim) wins for platform usability, education, customer support, and traders who don’t need global access.

Side-by-Side Overview

Feature Interactive Brokers TD Ameritrade (Schwab)
Stock commissions $0 (Lite) / $0.005/share (Pro) $0
Options per contract $0.65 (Lite) / $0.15-$0.65 (Pro tiered) $0.65
Margin rate ($25K) 5.33%-6.33% 11.00%-12.00%
Margin rate ($100K) 5.33%-5.83% 10.50%-11.50%
International markets 150+ in 34 countries Limited (Schwab Global)
Futures commissions $0.25-$0.85/contract $2.25/contract
Forex trading ✓ (direct interbank) ✓ (limited pairs through Schwab)
Crypto ✓ (direct)
Trading platform Trader Workstation (TWS) thinkorswim
Mobile app trading ✓ (IBKR Mobile) ✓ (thinkorswim Mobile)
Research Limited free / paid add-ons Extensive free research
Education Basic Best-in-class (Schwab)
Fractional shares
Customer support Phone, chat, email 24/7 phone + 300+ branches
Account minimum $0 $0
SIPC coverage $500K (up to $250K cash) $500K (up to $250K cash)

Commission and Fee Comparison

Stock Trading

Plan Interactive Brokers TD Ameritrade (Schwab)
Commission-free US stocks ✓ (IBKR Lite)
Per-share pricing (Pro) $0.005/share ($1 min) N/A
Tiered volume discount ✓ (as low as $0.0005/share)
Exchange/regulatory fees Passed through (Pro) Absorbed
Penny stocks $0 (Lite) / per-share (Pro) $6.95/trade (OTC)

Options Trading

Fee Component IBKR Lite IBKR Pro (Fixed) IBKR Pro (Tiered) TD Ameritrade
Per-contract fee $0.65 $0.65 $0.15-$0.65 $0.65
Base commission $0 $0 $0 $0
Exercise/assignment $0 $0 $0 $0
Monthly cost (100 contracts) $65 $65 $15-$65 $65
Monthly cost (1,000 contracts) $650 $650 $150-$650 $650

For high-volume options traders, IBKR Pro’s tiered pricing can cut costs by 75%+.

Futures Trading

Feature Interactive Brokers TD Ameritrade
Per-contract fee $0.25-$0.85 $2.25
Micro E-mini cost $0.25 $2.25
E-mini S&P 500 cost $0.85 $2.25
Exchange fees Additional Additional

IBKR is dramatically cheaper for futures — roughly 60-70% less per contract.

Margin Rates

This is IBKR’s biggest competitive advantage. No major US brokerage comes close.

Loan Amount Interactive Brokers TD Ameritrade (Schwab) IBKR Savings
$25,000 5.33%-6.33% 11.00%-12.00% ~50%
$50,000 5.33%-6.33% 10.75%-11.75% ~50%
$100,000 5.33%-5.83% 10.50%-11.50% ~50%
$300,000 5.33%-5.83% 10.00%-11.25% ~48%
$1,000,000 5.08%-5.58% 9.50%-10.75% ~48%

Annual Margin Cost on $100,000

Brokerage Rate Annual Interest
Interactive Brokers 5.58% $5,580
TD Ameritrade (Schwab) 11.00% $11,000
Savings with IBKR $5,420/year

If you use margin regularly, IBKR saves thousands annually.

Trading Platforms

Interactive Brokers — Trader Workstation (TWS)

Feature Rating
Charting ★★★★☆
Order types ★★★★★ (100+)
Algo trading ★★★★★
Customization ★★★★★
Learning curve Steep
Speed Excellent
API access ★★★★★

TWS is the most powerful retail trading platform available. It supports 100+ order types, algorithmic trading, portfolio-level analytics, and direct API access. The trade-off is a steep learning curve.

TD Ameritrade — thinkorswim

Feature Rating
Charting ★★★★★
Order types ★★★★☆
Options analysis ★★★★★
Customization ★★★★★
Learning curve Moderate
Paper trading ★★★★★
thinkScript ★★★★★

thinkorswim is widely considered the best options analysis platform available to retail traders. Its charting, paper trading, and thinkScript custom studies are best-in-class.

Platform Comparison by Use Case

Trading Style Better Platform Why
Options analysis thinkorswim Risk graphs, probability analysis, options chains
Algorithmic/API trading TWS Full API, 100+ order types, algo support
International markets TWS 150+ exchanges, multi-currency
Paper trading thinkorswim Best paper trading simulation
Charting Tie Both excellent
Forex TWS Direct interbank access
Day trading Tie Both fast execution

International Market Access

Feature Interactive Brokers TD Ameritrade (Schwab)
Countries 34 ~12 (through Schwab Global)
Exchanges 150+ ~30
Currency pairs (forex) 100+ ~70 through Schwab
Foreign stock trading Direct market access ADRs + Schwab Global
Multi-currency accounts ✓ (hold 27 currencies)
Currency conversion fees 0.002% (2 basis points) Higher
European markets ✓ (all major exchanges) Limited
Asian markets ✓ (Japan, HK, Australia, etc.) Limited
Fractional international shares

IBKR is the undisputed leader for international investing. No other US brokerage offers this breadth of access.

Research and Education

Feature Interactive Brokers TD Ameritrade (Schwab)
Free research reports Limited (some Refinitiv) Morningstar, Argus, Schwab Equity Ratings
Screeners ✓ (advanced) ✓ (excellent stock/ETF/mutual fund)
Educational content Basic articles Schwab Learning Center (extensive)
Webinars Occasional Daily live events
Paper trading ✓ (best-in-class via thinkorswim)
News Reuters, Dow Jones Reuters, Schwab Network
Analyst ratings ✓ (Schwab Equity Ratings)

TD Ameritrade (Schwab) wins decisively on research and education — more free content, better organized, and live learning events.

Account Types and Features

Account Type Interactive Brokers TD Ameritrade (Schwab)
Individual brokerage
Joint accounts
Traditional IRA
Roth IRA
SEP IRA
SIMPLE IRA
529 plan
Trust accounts
Custodial (UGMA/UTMA)
Business/entity accounts ✓ (LLC, Corp, Partnership)
Friends & Family management

Customer Support

Channel Interactive Brokers TD Ameritrade (Schwab)
Phone support Business hours 24/7
Chat
Email/ticket
Branches 300+ Schwab branches
Response quality Technical, expert Friendly, thorough
Wait times Moderate Generally short

Who Should Choose Each

Choose Interactive Brokers If You…

Scenario Why IBKR Wins
Trade on margin 50% lower margin rates ($5K+ savings/year on $100K)
Trade futures 60-70% lower per-contract fees
Need global market access 150+ exchanges in 34 countries
Are a high-volume options trader Tiered pricing down to $0.15/contract
Want API/algorithmic trading Best retail API, 100+ order types
Hold multiple currencies Multi-currency accounts, cheap FX conversion
Manage other people’s money Friends & Family account management

Choose TD Ameritrade (Schwab/thinkorswim) If You…

Scenario Why TDA/Schwab Wins
Want the best options analysis platform thinkorswim is unmatched for options
Value education and learning Best-in-class free education
Need in-person support 300+ Schwab branches
Want excellent paper trading thinkorswim paper trading is the best
Trade primarily US markets No reason to pay for global access
Prefer simpler account management Schwab’s interface is more approachable
Need 24/7 support Phone available around the clock

Decision Matrix

Your Priority Best Choice Confidence
Lowest margin rates IBKR Very High
Best options platform thinkorswim Very High
International markets IBKR Very High
Lowest futures fees IBKR Very High
Best education TDA (Schwab) Very High
Customer support TDA (Schwab) High
API/algo trading IBKR Very High
Paper trading TDA (Schwab) High
Simplest experience TDA (Schwab) High
High-volume options IBKR High

The Bottom Line

Factor Winner
Stock commissions Tie ($0 for casual traders)
Options (high volume) IBKR (tiered pricing)
Futures fees IBKR
Margin rates IBKR (by a wide margin)
Trading platform Tie (both best-in-class for different needs)
International access IBKR
Research TD Ameritrade (Schwab)
Education TD Ameritrade (Schwab)
Customer support TD Ameritrade (Schwab)
Ease of use TD Ameritrade (Schwab)
Overall: Professional/active traders Interactive Brokers
Overall: Intermediate traders TD Ameritrade (Schwab)
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