What nobody tells you
- An HSA is arguably the single best tax-advantaged account available in the US, but it's only accessible if you're enrolled in a qualifying high-deductible health plan.
- You can often have a 401(k) through work AND an IRA on the side — they're not mutually exclusive, though tax deductibility of the IRA may phase out at higher incomes.
- Employer match money in a 401(k) is real free money, but it may vest over several years, meaning you lose some or all of it if you leave too soon.
The basics
- 401(k): employer-sponsored, high contribution limits, often includes a match; funds are usually pre-tax (traditional) unless a Roth 401(k) option exists.
- Traditional IRA: individual account, pre-tax contributions (if eligible), taxed on withdrawal in retirement.
- Roth IRA: individual account, after-tax contributions, tax-free qualified withdrawals; income limits restrict who can contribute directly.
- HSA: paired with a high-deductible health plan, contributions are pre-tax, growth is tax-free, and withdrawals for qualified medical expenses are tax-free too.
The framework
Tax-now vs. tax-later vs. tax-never
Every account answers one question differently: when do you pay tax? Sorting accounts by this question makes the choice much clearer than memorizing rules.
- 01
Tax-later (traditional 401(k)/IRA): you deduct now, pay tax on withdrawal — useful if you expect a lower tax rate in retirement.
- 02
Tax-now (Roth 401(k)/IRA): you pay tax now, withdrawals are tax-free — useful if you expect a higher rate later or want tax diversification.
- 03
Tax-never for a specific purpose (HSA): triple-advantaged, but only for qualified medical expenses (though after 65 it behaves like a traditional IRA for non-medical spending).
The playbook
Words they use without explaining
- Vesting
- The schedule by which employer contributions become fully yours over time.
- Qualified medical expense
- IRS-defined costs an HSA can pay tax-free — broader than most people assume.
- Contribution limit
- The maximum you're allowed to put into an account in a given tax year.
The mistakes — what people get wrong
- Confusing an HSA with a flexible spending account (FSA) — HSAs roll over and stay yours forever; many FSAs are use-it-or-lose-it each year.
- Withdrawing from a 401(k) early, which usually triggers both tax and an additional penalty on top of losing years of compounding.
- Leaving a job before employer match contributions are fully vested and not realizing you forfeited part of that money.
Ask yourself
- Am I capturing my full employer match before contributing anywhere else?
- Am I eligible for an HSA, and am I using it as a retirement tool, not just a spending account?
- Would I rather pay tax now or later, given my expected income trajectory?
Go deeper
- Tool
Current-year IRS contribution limit tables
Limits change yearly — always check the current figures, not an old article.
- Concept
Roth conversion ladder
A more advanced strategy worth learning once the basics are automated.
- Book
The Simple Path to Wealth — JL Collins
A clear walkthrough of account types and index investing.
General educational information, not legal, tax, medical, or financial advice. Rules vary by country and change over time — verify with a qualified professional before acting.