Broker Fee Matrix Calculator
Free tool to compare flat fee vs percentage broker costs over 5 years, calculate break even deposit size, and find cheapest structure for your trades.
Like this tool? Help keep portfolios.tools free forever.
How It Works
Enter average deposit size per trade, number of transactions per year, flat fee per trade, and percentage fee rate. The calculator compares five year total cost under flat fee versus percentage fee structures. Small accounts with frequent trades often lose to percentage fees. Large accounts with infrequent trades often lose to flat fees. Example: twelve trades per year at $10 flat versus 0.1 percent on a $50,000 deposit. Retail investors executing twelve round trips per year on a twenty thousand dollar account pay materially different all in costs at zero commission brokers that monetize through payment for order flow versus flat five dollar ticket brokers. Options and foreign ordinaries often carry per contract or per ticket fees even when US equity commissions are zero.
Review five year flat fee total, five year percentage fee total, break even deposit where both structures cost the same, and recommendation flag. Raise transaction count to simulate active trading strategies. Lower deposit size to simulate dollar cost averaging with small lots. Break even deposit equals flat fee divided by percentage rate expressed as decimal fraction. Sensitivity table mindset: doubling trade count doubles flat fee drag linearly but leaves percentage fee drag unchanged if deposit size is fixed. Tripling deposit size scales percentage fee drag linearly while flat fee drag stays constant. Use both levers when modeling a move from hobby account to active swing book.
Break even deposit equals flat fee divided by percentage rate expressed as decimal fraction. Sensitivity table mindset: doubling trade count doubles flat fee drag linearly but leaves percentage fee drag unchanged if deposit size is fixed. Tripling deposit size scales percentage fee drag linearly while flat fee drag stays constant. Use both levers when modeling a move from hobby account to active swing book.
Use Broker Fee Matrix whenever inputs change: after market moves, new contributions, or revised personal assumptions. Bookmark the page for quick reruns without installing software.
Step by step
- Enter deposit size, trades per year, flat fee per trade, and percentage fee rate
- Compare five year totals and read break even deposit size
- Adjust trades per year or deposit size to match your broker and activity pattern
Worked example
Example scenario for Broker Fee Matrix: $10, $50,000. Enter those values above to reproduce the walkthrough described in How it works.
Adjust one input at a time to see sensitivity. Broker Fee Matrix updates instantly so you can stress test optimistic and conservative assumptions before acting.
When to use this calculator
Reach for Broker Fee Matrix when flat fee vs percentage broker costs and break even deposit size.. It suits quick what if analysis before trades, allocation changes, or plan updates.
Pair with related tools when the decision spans taxes, liquidity, or multi year projections beyond what one formula captures.
Common mistakes
Copying outputs without checking input units or stale market prices is a frequent error with Broker Fee Matrix. Confirm tickers, percentages, and dates before acting.
Running a single baseline scenario ignores tail risks. Stress test with conservative inputs and compare against related tools listed below when the decision is material.
The Formula
flatFeeTotal5yr = flatFee × transactionsPerYear × 5
pctFeeTotal5yr = depositSize × (feePct / 100) × transactionsPerYear × 5
breakEvenDeposit = flatFee / (feePct / 100)
Recommendation: flat if flatFeeTotal5yr <= pctFeeTotal5yr, else percentage
Five year cost equals per trade fee times annual trades times five. Break even deposit equals flat fee divided by percentage rate. Constant deposit assumption. Excludes custody and platform fees. Compare total five year cost at your actual trade count before switching brokers for small savings that compound on large accounts.
Limitations and assumptions
Five year cost equals per trade fee times annual trades times five. Break even deposit equals flat fee divided by percentage rate. Constant deposit assumption. Excludes custody and platform fees. Compare total five year cost at your actual trade count before switching brokers for small savings that compound on large accounts. Broker Fee Matrix does not replace personalized advice. Fees, slippage, account specific rules, and behavioral constraints may change real world outcomes.
Key terms
- Which is cheaper, flat fee or percentage fee
- Small accounts with frequent trades favor flat fee brokers when percentage fees compound on every ticket.
- How is the break even deposit calculated
- Break even deposit equals flat fee divided by fee percentage as a decimal.
- Model assumption
- Both totals equal cost per trade times transactions per year times five years.
Compare alternatives
Quantify FX conversion drag with FX Spread Cost and fund level fees with ETF Expense Ratio on portfolios. Use those calculators when broker fee matrix alone does not capture the full decision.
Internal links on portfolios.tools help you chain calculators: run Broker Fee Matrix first, then validate edge cases with a specialized tool from the related section below.
FAQ
Which is cheaper, flat fee or percentage fee?
Small accounts with frequent trades favor flat fee brokers when percentage fees compound on every ticket. Large accounts with infrequent trades favor percentage based pricing when flat fees dominate. US discount brokers frequently offer zero commission equity trades while options and foreign stocks still carry fees.
How is the break even deposit calculated?
Break even deposit equals flat fee divided by fee percentage as a decimal. At 0.1 percent fee and $10 flat fee, break even is $10,000 per trade. Deposits above break even make percentage fees more expensive than flat fees at the same trade count.
Does the 5-year comparison assume no changes?
Both totals equal cost per trade times transactions per year times five years. Flat model uses flat fee only. Percentage model uses deposit size times fee rate. Deposit size is held constant for comparison clarity.
Does this include all broker costs?
This calculator covers explicit per trade commissions only. Custody fees, inactivity fees, withdrawal fees, FX spreads, and platform subscriptions are excluded. Pair with FX Spread Cost when trading foreign currencies.
What related calculators should I pair with this?
Use FX Spread Cost for currency conversion drag on international trades. Use ETF Expense Ratio to compare fund management fees against trading commissions when building passive portfolios.
How do I use this Broker Fee Matrix calculator on phone or tablet?
Yes. Broker Fee Matrix runs entirely in your mobile browser with the same formulas as desktop. Optional localStorage may remember inputs on your device when enabled in browser settings.
Where is my data stored when I use Broker Fee Matrix?
Nowhere on our servers. Calculations execute locally in your browser. Optional localStorage saves form fields on your device only and never transmits portfolio numbers over the network.
Should I rely on Broker Fee Matrix for tax or legal decisions?
No. Broker Fee Matrix provides educational math only. Tax law, account rules, and personal circumstances vary. Consult a qualified tax or legal professional before transactions with material consequences.
Related Tools
Quantify FX conversion drag with FX Spread Cost and fund level fees with ETF Expense Ratio on portfolios.tools when comparing total broker economics beyond per trade commissions.