How to Track Your Portfolio Performance

Your account balance went up this month. That does not tell you whether you are a better investor than you were last year.

Balance is the number your broker shows you. It moves when the market moves, when you deposit cash, and when you take money out. None of those things measure your skill. To know whether your decisions are working, you need to separate three things that most people blur together: how much money you have, how much return your choices produced, and how much risk you took to produce it.

This is a first-principles walkthrough. By the end you will have a repeatable process that survives deposits, withdrawals, and the temptation to judge yourself by a single green day.

TL;DR

• Balance is not performance. Watching your account value tells you your net worth, not the quality of your decisions.
• Start with NAV. Net asset value (positions marked to current prices, plus cash) is the honest snapshot to measure from.
• Use return, not raw dollars. A percentage return lets you compare periods and compare yourself to a benchmark.
• Pick the right return type. Time-weighted return measures your strategy; money-weighted return measures your timing and cash flows.
• Add a risk lens. Two portfolios with the same return are not equal if one swung twice as hard. Drawdown and the Sharpe ratio close that gap.
• Compare against a benchmark. A 12 percent year means little until you know what a simple index did over the same window.

Step one: measure from NAV, not your balance line

Before you can track a return, you need a clean starting number. That number is your net asset value, or NAV: the current market value of every open position, plus cash, minus anything you owe. If you hold 40 shares of a stock trading at 50 dollars and 1,000 dollars in cash, your NAV is 3,000 dollars. When prices update, NAV updates.

NAV matters because it is honest about unrealized gains. A balance that only counts closed trades hides the losing position you are still holding and hoping recovers. A NAV that marks every open position to its current price does not let you hide. The distinction between watching a balance and measuring performance looks like this:

The left card is what your brokerage app shows you. The right card is what you actually want to know. Getting from left to right is the whole job.

Step two: convert dollars into a return

Raw dollars cannot be compared across time or across accounts. A 2,000 dollar gain on a 20,000 dollar account is a strong 10 percent. The same 2,000 dollars on a 400,000 dollar account is a rounding error. Percentage return normalizes for size so you can compare July to August, or your account to an index.

The trap is cash flow. Suppose your account grows from 20,000 to 25,000 in a quarter. That looks like a 25 percent return. But if you deposited 4,000 dollars mid-quarter, only 1,000 of that 5,000 dollar gain came from the market. Naively dividing end by start credits your deposit as if it were investing skill. Every serious performance metric exists to strip that distortion out.

There are two honest ways to do it, and they answer different questions.

Time-weighted return: how good was the strategy

Time-weighted return (TWR) measures the performance of the investments themselves, independent of when you added or removed money. It works by breaking the period into sub-periods around each deposit and withdrawal, calculating the return of each sub-period, and chaining them together. Because it neutralizes the timing and size of your cash flows, TWR isolates the decisions: what you held and when.

This is why the CFA Institute's Global Investment Performance Standards require time-weighted return for reporting manager performance. Cash flows are usually driven by the client, not the manager, so removing them is the only fair way to compare one strategy against another.

Use TWR when you want to ask: "Was my stock selection and timing any good, setting aside how much cash I happened to add?"

Money-weighted return: how good was your timing

Money-weighted return (MWR), which is the internal rate of return of your portfolio, does the opposite. It deliberately includes the timing and size of every cash flow. If you poured money in right before a rally, MWR rewards you. If you added right before a drop, it penalizes you.

Sharesight illustrates the gap with a stark example: an investor can post a positive 11.80 percent time-weighted return while simultaneously experiencing a -12.77 percent money-weighted return on the same account, because a large contribution landed at exactly the wrong moment. The strategy worked; the timing of the cash did not.

Use MWR when you want to ask: "Given everything I actually did, including when I moved cash, what did I really earn on my capital?"

As CIBC Investor's Edge frames it, the time-weighted figure tells you how well the underlying investments performed, while the money-weighted figure is unique to you because it folds in your contribution and withdrawal decisions. You are allowed to track both. They are not in competition.

Step three: judge return against the risk you took

A return number in isolation still lies to you, because it says nothing about how much stress you absorbed to get it. Two traders both finish the year up 15 percent. One rode a smooth curve; the other was down 30 percent in the spring and clawed back. They did not perform equally. The second one took far more risk for the same reward, and would not survive if the spring had gone slightly worse.

Two metrics turn that intuition into a number.

Maximum drawdown is the largest peak-to-trough decline your portfolio suffered before recovering, expressed as a percentage. Corporate Finance Institute defines it as the most significant drop from a high point to a subsequent low. The formula is simple: (peak value − trough value) / peak value. A max drawdown of -30 percent means that at your worst moment you were down nearly a third from your best. It tells you the size of the hole you had to climb out of, which is the number that decides whether you will actually stick to a strategy or panic-sell at the bottom.

The Sharpe ratio measures return per unit of risk. Corporate Finance Institute gives the formula as (Rx − Rf) / StdDev Rx, where Rx is your portfolio return, Rf is the risk-free rate (roughly what short-term government bonds pay), and StdDev Rx is the standard deviation of your returns, a proxy for volatility. In plain terms, it asks how much extra return you earned for each unit of bumpiness you endured. A higher Sharpe ratio means you were paid better for the risk you carried. When you compare two strategies with similar returns, the one with the higher Sharpe ratio was the more efficient way to get there.

You do not need to compute these by hand every day. You need to understand what they mean so that when you see a smooth-looking equity curve, you ask what it cost in drawdown, and when you see a big return, you ask what volatility hid underneath it. If you want the broader menu of numbers worth watching, our guide to the 15 essential trading metrics walks through them one by one.

Step four: measure yourself against a benchmark

Here is the question that ends most self-congratulation: compared to what?

A 12 percent year sounds excellent until you learn a plain index fund returned 20 percent over the same window. You did not beat the market. You paid yourself a wage in effort and attention to underperform something you could have bought once and ignored. That is not a reason to quit. It is a reason to know the truth.

A benchmark is simply a passive alternative you could have held instead. For a stock trader, a broad index like the S&P 500 is the honest yardstick. The comparison only works when the windows match: same start date, same end date, same treatment of dividends. Comparing your best three months against the index's worst three months is a story, not a measurement.

Track the gap over time, not on any single day. One month of beating the benchmark is noise. Twelve months of it is a signal.

Step five: make it a habit, not a mood

Performance tracking fails when it happens at random, usually right after a big win (to feel good) or a big loss (to feel bad). Neither is a measurement. A schedule beats an impulse.

A workable cadence for most active traders:

• Weekly: a quick glance at NAV and open risk. Not a full review, just a heartbeat check.
• Monthly: a real review of return, drawdown, and benchmark gap. Our monthly trading performance review lays out exactly what to look at.
• Quarterly: step back to the strategy level, where a couple of months of TWR is finally long enough to mean something.

The reason to write it down is that memory is a liar. You will remember the trade that made your year and forget the four that quietly bled. A journal fixes the record in place, which is why we keep saying that a trading journal is important for anyone serious about improving. If you track outcomes without tracking the decisions that produced them, you can see that you are underperforming but never learn why. Pairing performance metrics with something like R-multiple tracking in your journal closes that loop: the numbers tell you the result, the journal tells you the cause.

Where the mechanics get messy

Two real-world complications break simple tracking, and both are worth flagging.

The first is multiple accounts. If your positions are spread across two or three brokers, no single app shows your true portfolio, and each broker's own return figure ignores the others. You have to consolidate before you can measure. That is its own discipline, covered in how to track P&L across multiple brokers.

The second is assets that trade around the clock, where "the closing price" is a fuzzier concept and volatility runs hot. The principles above still hold, but the mechanics of snapshots and drawdown need extra care for crypto and other 24-hour markets. And because the right review frequency depends on how often you actually trade, it is worth thinking through how often to review rather than defaulting to checking every hour.

A tool that computes NAV, time-weighted return, drawdown, and the rest from your own positions saves you from rebuilding a spreadsheet every month. TradeReveal does this from your logged and imported trades, consolidates across accounts into a single reporting currency, and keeps the journal beside the numbers so cause and effect stay linked. Once the calculation is automated, the only work left is the part that matters: reading the result honestly.

Frequently Asked Questions

What is the difference between my account balance and my portfolio performance?

Your balance is the total value of your account at a moment in time. It moves for reasons that have nothing to do with your skill, including deposits, withdrawals, and general market direction. Performance is the return your decisions produced after stripping those distortions out, ideally expressed as a percentage and judged against the risk you took and a benchmark you could have held instead.

Should I use time-weighted or money-weighted return?

Both, for different questions. Time-weighted return removes the effect of your deposits and withdrawals, so it measures the quality of the strategy itself. Money-weighted return includes them, so it measures the real return on your capital including your timing. If you are judging your stock picks, use TWR. If you want to know what you actually earned given everything you did, use MWR.

How do I account for deposits and withdrawals when tracking returns?

Do not simply divide your ending value by your starting value, because that credits deposits as if they were gains. Use a return method that handles cash flows explicitly. Time-weighted return breaks the period into segments around each cash flow and chains the segment returns together. Money-weighted return treats each cash flow as an input to an internal-rate-of-return calculation. Most portfolio trackers compute one or both for you, which is one of the jobs a tracker does and a journal does not.

What is a good Sharpe ratio?

A higher Sharpe ratio means more return per unit of risk, and figures above 1 are generally viewed as solid, though the right threshold depends on your strategy and market conditions. It is most useful as a relative measure: use it to compare two of your own strategies, or your portfolio against a benchmark, rather than chasing an absolute target.

How often should I check my portfolio performance?

For active traders, a light weekly glance at NAV and open risk plus a proper monthly review of return, drawdown, and benchmark gap works well, with a deeper quarterly look at strategy. Checking obsessively during the day tends to feed emotional decisions without adding any measurement value, because a single day is far too short a window to mean anything.

Final Thoughts

Tracking portfolio performance is the practice of refusing to be fooled by your own balance line. Start from NAV so unrealized losses cannot hide. Convert dollars to a return so you can compare across time. Choose time-weighted return to judge the strategy and money-weighted return to judge your capital, then hold both up against drawdown, the Sharpe ratio, and a benchmark you could have owned instead. Do it on a schedule, not on a mood, and write down the decisions alongside the numbers so you can eventually explain your results rather than just observe them.

The trader who knows their real return, and what it cost in risk, makes better decisions than the one staring at a green balance. That clarity is the entire point.

Sources

• Time-weighted vs. money-weighted rates of return (Sharesight)
• Overview of the Global Investment Performance Standards (CFA Institute)
• Comparing Time-Weighted Versus Money-Weighted Rates of Return (CIBC Investor's Edge)
• Sharpe Ratio: Formula and Definition (Corporate Finance Institute)
• Maximum Drawdown: Overview and Formula (Corporate Finance Institute)

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Happy Trading,

The TradeReveal Team