Is a Net Worth Tracker Worth It for Software Engineers at Startups?

A net worth tracker for software engineers at startups is only useful if it tells you what the equity on your balance sheet is actually worth, not what the founder quoted at all-hands. The May 2024 BLS median wage for software developers was $133,080,^[] but that number understates the real story for this group: the balance sheet is dominated by vested options in a company whose survival is itself the single biggest risk factor in the portfolio.

Carta's long-horizon data shows 62% of venture-backed startups shut down within seven years, and Q1 2024 alone saw 254 shutdowns on the platform — the highest quarterly total of the decade and roughly seven times the 2019 rate.^[] Any serious tracker has to take that base rate seriously. Equity that does not survive to a liquidity event is worth zero, and equity that does often clears through a preferred-stock waterfall that leaves common-holders with far less than the face value implied by the last preferred round.

What the numbers say about startup equity outcomes

Startup outcomes follow a power law. A rough rule of thumb from the Carta data is that fewer than 10% of seed-funded startups return more than 5x invested capital, while the majority return little or nothing.^[] For employees, this maps to a distribution where most vested options end up worth a small fraction of what the recruiting page implied.

The Series A crunch tightens it further. Of companies that raised seed in early 2022, only 15.4% made it to a Series A within two years, compared with 30.6% of the 2018 cohort.^[] That matters for anyone whose options are vesting toward a later liquidity event — the event itself has become meaningfully less likely over the last two vintages.

How to value illiquid equity on a monthly net worth snapshot

The single biggest mistake I see startup engineers make is entering their equity at the last preferred-round price. A 409A valuation of the common stock is typically 10-30% of that preferred number because common lacks liquidation preferences, anti-dilution rights, and other investor protections.^[] The 409A figure is the number the IRS agrees your common stock is worth today, and it belongs on the balance sheet.

An honest tracker shows three tiers for the same equity line: face value at preferred, balance-sheet value at the 409A common-stock price, and a probability-weighted value that bakes in the survival base rate and the expected liquidation waterfall. The calculation rendered below walks through 10,000 vested ISOs at a $1 strike and shows how the three numbers can span an order of magnitude — $200,000, $40,000, and about $23,000 — for the same underlying grant.

Treating the 409A number as the carrying value on the balance sheet is the defensible default for monthly tracking. Face value at preferred is worth capturing too, but as a ceiling, not as the headline number. The probability-weighted figure is the one I reference when deciding how much cash to divert from taxable-brokerage contributions toward shoring up the liquid side of the sheet.

What a net worth tracker for software engineers at startups should show

For a startup engineer, the tracker is useful when it surfaces five balance-sheet lines that a generic app tends to collapse into one equity total:

1. Liquid net worth — checking, savings, brokerage, 401(k), IRA, and HSA. This is the number that survives a zero outcome on the equity.
2. Balance-sheet equity at 409A — vested shares multiplied by the most recent common-stock 409A FMV. Updates quarterly when the company recertifies.
3. Probability-weighted equity — face value at preferred, discounted by survival probability, expected multiple, and waterfall capture. One number, one set of honest assumptions.
4. Estimated AMT liability if I exercise all vested ISOs today — the bargain element between strike and 409A FMV is added to AMTI, not to ordinary income.^[] A startup engineer should carry this as a separate line because exercising turns paper wealth into a real cash tax bill.
5. Concentration percentage — balance-sheet equity as a share of total net worth. For reference, see the years-to-FI math on a startup salary with equity excluded — it is sobering, and it is also the honest denominator for savings-rate decisions.

Industry benchmarking suggests tech workers routinely sit at 40-60% of total wealth in employer stock, which is well above the 10-20% concentration ceiling most wealth managers flag as a portfolio risk. The tracker should turn that percentage red when it crosses 25%.

The mistake that wipes out most of the paper gains

Two failure modes account for most of the destroyed paper wealth I see. The first is letting vested ISOs expire at the 90-day post-termination exercise window after leaving the company — the options evaporate without any sale, because exercising them would require a cash outlay most engineers have not planned for. The second is exercising into a bad AMT year without modeling the tax cliff: the 2025 AMT rate is 26% on the first $239,100 of AMTI excess, with a $70,300 single and $109,400 MFJ exemption,^[] and the bargain element on an ISO exercise stacks directly onto AMTI.

A tracker that shows the AMT-if-exercised line alongside the current balance-sheet value surfaces the decision you actually have to make. A tracker that only shows total net worth going up $40k this quarter because the 409A ticked up hides it.

The same applies on the concentration side: RSUs are ordinary income the moment they vest,^[] which means every vesting event is a tax-efficiency decision about whether to hold or diversify. Holding on autopilot is the default that produces the 40-60% concentration figure, which is how portfolios get wrecked when the company disappoints.

What I'd actually track each month

For a startup engineer, a monthly tracker should carry five numbers: liquid net worth, balance-sheet equity at 409A, probability-weighted equity, AMT liability if-exercised, and concentration percentage. The first three answer what your equity is worth right now, honestly. The fourth answers what it costs to convert to real ownership. The fifth answers how much of your future depends on one employer surviving.

If I had to pick a single number to watch, it would be liquid net worth, measured monthly and graphed against a five-year trendline. Everything else is context.