401(k) and IRA — High Level
Account types in everyday language
These are containers, not investments. A 401(k) is not a thing you buy — it is an account with tax advantages that holds whatever funds you select inside it. Getting that distinction straight clears up most of the confusion beginners have.
The 401(k) in one paragraph
It is an employer-sponsored account funded through payroll deduction, often with a company match. Contribution limits are considerably higher than IRA limits.
The investment menu is chosen by your employer, which means your options are limited but usually adequate. Look for a broad index fund or a target-date fund on the list.
Money generally cannot be withdrawn without penalty before 59 and a half, with some exceptions. That restriction is the tradeoff for the tax benefit.
The IRA in one paragraph
It is an account you open yourself at a brokerage, independent of any employer. You can invest in nearly anything available at that brokerage.
Annual contribution limits are lower than a 401(k), and income limits can affect eligibility for certain types.
Because you control the account, the fees are usually lower and the fund selection is wider. That makes an IRA a good home for contributions beyond your employer match.
- Both are accounts, not investments — you still choose funds inside them.
- 401(k): higher limits, employer match, limited fund menu.
- IRA: lower limits, wider choices, usually lower fees.
- Traditional: deduction now, taxed on withdrawal.
- Roth: no deduction now, qualified withdrawals come out tax-free.
Traditional versus Roth
Traditional contributions reduce your taxable income now, and withdrawals in retirement are taxed as ordinary income. You are deferring the tax bill.
Roth contributions provide no deduction today, but qualified withdrawals later are tax-free, including all the growth.
The rough rule is that Roth tends to favor people in lower tax brackets now than they expect later, and traditional favors the reverse. Having some of each provides flexibility you will appreciate.
A sensible order of operations
Contribute enough to the 401(k) to capture the full employer match, because that is an immediate return nothing else offers.
Then consider maxing an IRA, where your fund choices are usually better and cheaper.
After that, return to the 401(k) for additional contributions up to the limit, and use a taxable brokerage account beyond that.
Contribution limits and what happens if you exceed them
Both account types have annual contribution limits set by the IRS, and they change periodically. Look up the current figures rather than relying on a number you remember.
Exceeding an IRA limit creates a penalty that applies each year the excess remains, so it is worth correcting promptly if it happens.
The 401(k) limit is per person across all employer plans, which catches people who change jobs mid-year and contribute the maximum at both employers.
Employer contributions generally do not count against your personal limit, which is another reason the match is such a good deal.
What the calculator does and does not handle
This tool projects a balance regardless of which account holds it. It does not model contribution limits, tax deductions, or the tax treatment of withdrawals.
For traditional accounts, remember the projected balance is pre-tax. The spendable amount will be lower after income tax in retirement.
For Roth accounts, the projection is closer to what you can actually spend, which is worth remembering when comparing the two.
If you hold both types, a reasonable approach is to project them together and mentally discount the traditional portion for taxes when planning your retirement budget.
Try these inputs
- Match only: contribute 6% of salary, your real timeline
- Match plus IRA: add the monthly IRA equivalent to the contribution
- Full effort: match plus maxed IRA plus extra 401(k)