The risk nobody models
Every retirement tool computes your odds of running out. Almost none compute the far likelier outcome: that you will die holding a decade of unspent work.
Ask someone what they are afraid of in retirement and they will say running out of money. It is a vivid fear, and vividness is exactly the problem — it is the risk that is easy to picture, so it gets the attention, and the risk that is hard to picture gets none at all.
The hard-to-picture one looks like this. You retire at 64 instead of 62 because two more years feels safer. You take the smaller of two houses. You fly coach to see the grandchildren twice a year instead of four times. You do this steadily, without drama, for twenty-five years. Then you die with more money than you retired with, and every one of those decisions turns out to have bought nothing.
The shape of the error
Bill Perkins makes the observation in Die With Zero that the average person dies with roughly the net worth they had at fifty. Not a drawn-down fraction of it. Roughly all of it. Whatever people intend when they retire, the aggregate behavior is that the principal is never really touched.
That book gets dismissed a lot by people responding to its title rather than its contents. The argument is not "spend everything and hope." It is that money has a use-by date attached to your own body: the same $10,000 buys a hiking trip at 55, a cruise at 70, and a nicer chair at 85. Deferring it isn't neutral. It converts it into something worth less to you, and eventually into something worth nothing to you at all.
For every year you worked but didn't spend what you earned that year, you were working and someone else was being paid for it.
Sometimes that is the intention, and a chosen gift is a real and good thing. But there is a difference between leaving money to your children and accidentally leaving money to your children because your plan was calibrated for a disaster that never came. The first is generosity. The second is an unexamined default with a beneficiary attached.
Why the error is so durable
Because nothing corrects it. Overspending announces itself — the balance falls, the statements get uncomfortable, you adjust. Underspending is silent. There is no month where the account tells you that you could have afforded the better trip. The feedback only arrives at the end, to someone else.
And the tools make it worse. A projection that reports "94% probability of success" invites exactly one response: get that number higher. There is no symmetric warning, no gauge that turns amber when you are on track to leave $2 million unspent. So every nudge the interface gives you points the same direction, and thirty years of small nudges is not a small thing.
What to do instead
Not the opposite error. Overspending is genuinely dangerous, and a plan that ignores it is worse than a conservative one. The fix is to put both failures on the same screen and let them argue.
That is what this site's chart is for. It shows the range of what you might have left — not to reassure you, but because the top of that range is a number you are currently on course to never spend. If the median outcome of your plan is dying with twice what you started with, that is not a success. It is a finding, and it should change something.