If you have read anything about employer benefits, it was almost certainly about the retirement match — take it, it is free money, do not leave it on the table. That advice is correct and it is worth repeating.
It is also roughly one item on a list of ten, and the other nine come up once a year, on a deadline, in a form most people click through in about four minutes.
Open enrollment is the single densest financial decision most employed households make, and it is made annually, under time pressure, with no advice attached. This chapter is about what is actually in it.
Beyond taking the match, three numbers and one new rule matter.
How much you can put in. For 2026 the employee limit on a 401(k), 403(b), most 457 plans and the federal TSP is $24,500.1 Separately, an IRA takes $7,500.1 These are different buckets, not one shared allowance — a common and expensive misunderstanding.
Catch-up, if you are over 50. An extra $8,000, bringing the workplace total to $32,500.1 There is a larger one for a narrow band: if you turn 60, 61, 62 or 63 during the year, the catch-up is $11,250 instead.1 It applies for those four years only, which makes it easy to miss entirely.
A rule that is new as of this year. From 1 January 2026, if your prior-year wages from the employer sponsoring the plan were above $150,000, your catch-up contributions must be made as Roth — after-tax — rather than pre-tax.1 Nobody has to do anything differently to save; the tax treatment changes underneath. It is worth knowing before it shows up as a surprise on a pay stub.
Vesting is the other retirement item worth reading. Your own contributions are always yours. The employer's may not be until you have been there long enough. If you are considering leaving, the vesting date can be worth more than a month's salary, and it is in a document nobody opens.
This gets its own chapter, because the choice is genuinely arithmetic rather than a preference and because it decides whether one of the best accounts available to you is open at all.
The short version: a high-deductible plan is the only type that makes you eligible to contribute to a health savings account. For 2026 a qualifying plan means a deductible of at least $1,700 for self-only cover or $3,400 for family cover.2
The health savings account. For 2026 you can put in $4,400 with self-only cover or $8,750 with family cover, plus $1,000 more if you are 55 or over.2 It is the only common account where money goes in untaxed, grows untaxed, and comes out untaxed for medical costs. It does not expire at year end, and it stays yours when you leave the job.
The flexible spending account. Different animal entirely, and confused with the above constantly. It is use-it-or-lose-it within the year, and it does not follow you out of the door. Useful for costs you can actually predict; risky as a place to park money.
The dependent care account. Pre-tax money for childcare. For a household paying for full-time care this is often the single largest tax saving available to them, and it is routinely left unclaimed.
The share purchase plan, where one exists. Employees buy company shares at a discount, sometimes a large one. The discount is real money on day one. The risk is equally real and specific: your salary and your savings then depend on the same company, so a bad year for the employer is a bad year for both at once.
Group life is usually provided at some multiple of salary, free or nearly. Worth knowing the multiple, because it is almost never the amount a household with dependants would actually need, and the shortfall is invisible until it matters.
Group disability is the one that gets skipped and probably should not. The chance of being unable to work for an extended period during a career is considerably higher than most people assume, and it removes income entirely rather than adding a cost. Two details decide what the cover is worth: what fraction of salary it replaces, and whether the premium is paid pre-tax or post-tax — because that determines whether the benefit arrives taxed or untaxed, which can change its real value substantially.
Both usually end when the job does.
The reason to take open enrollment seriously is not that any single item is enormous. It is that there are ten of them, they compound, most default to the wrong setting for you personally, and you get one chance a year to change them.
An hour, once, with the actual documents open, is one of the highest-value hours in personal finance. It is also one almost nobody spends, because the deadline arrives in an email that looks like administration.
Most of these decisions are invisible in a bank account. What Plenee can show is the consequence: what the deductions actually cost you each month, what the plan choice did to your take-home, and whether the accounts you elected are being funded or quietly sitting at zero because a default was never changed.
The match is one item. Around it sit contribution limits that changed this year, a new Roth rule for higher earners, and the most tax-efficient health account most people can open. Then a childcare account many households never claim, a vesting date that can be worth a month's pay, and disability cover you are likelier to need than life cover. All of it is decided once a year, on a deadline, by default if you do nothing.
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