Tax-Advantaged Accounts

Every tax-advantaged account is a trade. The government gives up tax revenue to encourage a goal it favors, such as retirement security, health care, education or support for people with disabilities. In return, the account limits how much can go in and what the money may be used for. Spend it on the favored goal and the break holds; use it for anything else and you usually repay the tax, often with a penalty.

The break arrives at one of three points in the money’s life. Some accounts give it at the start: contributions are deducted or excluded from income and withdrawals are taxed later, which is what makes an account Tax-Deferred Account. Others give it at the end: you contribute money that has already been taxed, and qualified withdrawals are tax-free, as with a Roth IRA or a 529 plan. All of them skip tax on growth while the money stays inside.

A health savings account is the rare case that gives the break at every stage: deductible contributions, untaxed growth and tax-free withdrawals for qualified medical costs.

Most people meet their first tax-advantaged account through work, but the family is much wider than the 401(k). The accounts group naturally by the goal they serve, and each group has its own limits and qualifying expenses. The figures below are 2026 limits; several are indexed for inflation, so they rise over time. Other countries have their own versions under different names, such as Canada’s TFSA and the United Kingdom’s ISA.

The value of a tax-advantaged account comes from two sources. The first is the timing of the tax: paying it at a low rate instead of a high one. The second is growth that is never taxed along the way, which is where the gap over an ordinary taxable brokerage account opens up. In a taxable account, interest and dividends are taxed every year and gains when you sell, a steady cost known as tax drag.

The formula and worked example below follow $5,000 of salary for 20 years through four accounts. Deducting now and paying later is the mirror image of paying now and never again, so at equal tax rates a traditional and a Roth account finish level; only a change in your rate separates them.

Payroll taxes widen the HSA’s lead. Pre-tax 401(k) deferrals escape income tax but are still subject to Social Security and Medicare taxes, while HSA contributions made through an employer’s payroll are exempt from both, which saves another 7.65% on wages below the Social Security wage base.

Every tax break comes with conditions, and breaking them can cost more than the break was worth. Limits are set per person or per family and usually cover all your accounts of one type together, so opening a second account does not create new room. Rules on timing and use matter as much as the dollar caps, and a penalty is usually charged on top of the income tax you would owe anyway.

There is no single right order, but planners often weigh accounts in a similar sequence. First comes any employer match, since it is an immediate return on the money you put in. An HSA often comes next for people eligible for one, because of its unmatched tax treatment. After that the choices are between filling a workplace plan and funding an IRA, and between traditional and Roth versions, which turns on whether you expect your tax rate to be higher now or later. Holding some of each, known as tax diversification, keeps both options open.

Money beyond the limits, or money you may need before retirement, belongs in a taxable account, which has no limits and no withdrawal rules. Where you hold each investment matters too: placing tax-inefficient holdings such as taxable bonds inside sheltered accounts, and tax-efficient index funds in the taxable account, is called asset location. Cash for emergencies should stay where you can reach it without taxes or penalties.