The Ten Years You Spent Are the Reason You Should Leave, Not Stay

The ten years you've put into this job are not a reason to stay. They're already gone. They will stay gone whether you leave tomorrow or in 2036. The only number that decides this is the next ten years: what they look like if you stay versus if you go. Every year you stay to honor the past adds to the cost, not the value.

Here's the part the voice in your head won't say out loud. That voice isn't doing math. It's running the sunk cost fallacy, protecting you from the feeling that the decade was a mistake. So it reframes leaving as "throwing it all away," when the years were spent the moment you lived them. The career-advice industry feeds this. It's obsessed with how to advance inside the role you already have: the raise script, the promotion checklist, the feedback loop. All of it quietly assumes your tenure is equity worth preserving. It isn't equity. It's a receipt.

Why does the sunk cost fallacy keep you in the wrong career?

Because abandoning something you paid for feels like waste, and your brain treats avoiding that feeling as a goal. That's the sunk cost fallacy, and it's one of the most reliably documented biases in behavioral science.

Start with the cleanest demonstration. In a 1985 study, researchers sold theater season tickets at three prices: full price, a small discount, and a large discount. The people who paid full price attended an average of 4.11 plays in the first half of the season, while the discounted groups attended around 3.3. Same plays. Same theater. The only difference was how much they'd already paid, and the higher the sunk payment, the more they showed up to "use it." The money was gone either way. It changed their behavior anyway.

The obvious objection: money is money, but time is different, surely we're smarter about time. We're not. A 2009 set of experiments isolated sunk time specifically. When prior time investment was high, 86% of participants chose to keep going versus only 47% when the prior investment was low. Time already spent inflated the willingness to persist by nearly 40 points. Your decade is exactly this lever, pulled to the floor.

Isn't staying the rational, careful choice?

Often it's the opposite. It's self-justification dressed up as prudence.

A 1976 study by Barry Staw, "Knee-Deep in the Big Muddy" in Organizational Behavior and Human Performance, handed business students a failing investment and the chance to commit more resources. The people who'd made the original losing decision themselves poured in the most additional money, more than people cleaning up someone else's mess. The driver wasn't expected value. It was the cost of admitting the first call was wrong.

Careers run on the same engine. The mid-level manager turns down a better role because taking it would mean conceding the last six years were a plateau, the stretch where most salaries quietly flatten. That admission is so expensive emotionally that staying put feels cheaper, even when it isn't.

Picture two ways the same person could narrate the same nine years. The numbers below are illustrative, not data, just the shape of the two internal monologues:

Weak: "I've been at this bank for nine years. If I leave now, I'm throwing all of that away."

Strong: "I've been at this bank for nine years. My salary barely moved across the back half of them. Market comp for my role is meaningfully higher. If I leave, my forward expected value is positive. The nine years are done either way, so they don't get a vote."

The weak version is an emotion wearing a number. The strong version is a number with the emotion removed.

What is staying actually costing you in money?

More than the raise you're waiting for, in most cases. The premium you assume tenure earns you frequently isn't there.

Look at who gets paid. An analysis of 786,000 employees across 1,716 job groups found that in 83% of high-paying job groups (averaging $125K and up), long-tenured employees earned the same or less than new hires doing the same work. Thirty percent of the time, the tenured employee earned less. The loyalty discount is real, and you're the one paying it.

Now the other side of the trade. In one widely-cited snapshot, job switchers saw median year-over-year pay gains of 10% versus 5.1% for people who stayed, close to double. (Read the caveat below before you over-index on that gap, because the spread moves with the labor market.) And the market already assumes you'll move: median US tenure was 3.9 years overall and 3.5 years in the private sector in early 2024, the lowest reading since 2002. Mobility isn't betrayal. It's the baseline everyone else already priced in, as long as you can explain the moves as a story rather than a stumble.

The story you tell	What the data says
"My loyalty will pay off in the review."	In 83% of high-pay roles, tenure buys no premium; 30% of the time it costs you.
"Switching is risky and unstable."	Median tenure is 3.9 years. The market expects movement and pays for it.
"Leaving wastes the years I built."	The years are spent. Staying spends the next ones on top.

What is the only question worth answering?

Forward expected value. What do the next five years look like if you stay, and what do they look like if you leave? The sunk years aren't allowed in the equation.

There's a piece of labor economics worth borrowing here, without the jargon. A foundational 1979 model made a simple point: you can't know how well a job actually fits you in advance. Match quality is discovered by moving. The good matches, the ones where you compound fastest, are found by leaving the mediocre ones. Staying in a low-quality match isn't caution. It's a loss you're paying off slowly.

Picture the engineer who's technically strong but stuck in a product domain that bores them. They won't plateau because they lack skill. They'll plateau because low engagement quietly suppresses their output and their visibility, and no raise negotiation at the current employer fixes a match problem. The move to a domain they actually care about carries an upside that a counteroffer can't touch, even after you account for the pay cut most pivots charge up front. That's the compounding the past can't give back to you. Consistency in the wrong place still compounds. It just compounds the wrong thing.

To run your own number, write down four things and ignore everything before today:

1. My current comp, and honest market comp for my role elsewhere.
2. My skill trajectory if I stay another two years versus if I move.
3. My match quality now: am I engaged, or enduring?
4. The forward five-year value of each path.

The decade I already spent appears nowhere on this list. That's the point.

Doesn't most evidence say people regret leaving?

The opposite, on the data that matters. The regret clusters around staying.

A 2026 study found that 58% of workers named staying in a bad job too long as their biggest career regret, against 38% who regretted quitting. And the feeling of being trapped is widespread: a 2024 poll found 65% of employees feel stuck in their current role, rising to 73% among tech workers (a self-selected community sample, so read it as direction, not gospel). And frequent moving early in a career is the historical norm, not an anomaly: BLS longitudinal data found the 1957 to 1964 cohort held an average of 5.6 jobs from ages 18 to 24 alone. The pattern is consistent: the staying is what people wish they could take back.

When is tenure a real reason to stay?

When the years bought you a genuine asset that still pays forward, not a feeling you're avoiding. This is the trade-off, named plainly, and it cuts both ways.

Tenure is a real asset when it produced things that compound: deep domain expertise that's scarce in the market, trusted relationships that open doors, institutional knowledge that makes you more effective than any newcomer, or equity vesting with actual upside. Those are forward-looking. They show up in your next-five-years math on their own merits, with the decade nowhere in the calculation.

Here's the honest counterweight, because "just leave" is its own trap. Impulsive exits to escape the discomfort of feeling stuck are also a bias, the mirror image of sunk cost. People who quit on a bad day, with no math done, frequently regret it. The labor market caveat matters too: that switcher premium narrows when hiring cools, and by 2025 the gap had shrunk well below the figure above. Timing is real. So is the difference between a move you reasoned into and one you bolted toward.

The case here was never "always leave." It's that your past years should never be the thing keeping you. Decide on the forward number. If the asset is real and the number says stay, stay with a clear head. If the only thing holding you is the receipt, that's not a reason.

What to do now

Stop counting backward. Today, write down your current comp and the honest market rate for your role. This week, name your match quality in one sentence: engaged, or enduring. Then run the five-year-forward number for both paths and let that decide, with the past locked out of the room.

If the number says go, the years you spent aren't lost. They're what make you worth hiring. If it says stay, you'll stay because the future is good, not because the past was expensive.

Want to run that number with real market comp and an honest read on whether you're stuck or just scared? Message Praxy on WhatsApp and we'll do the forward math together, no flinching.