HR signed me up for a Roth 401(k) at 3%.

Being in is the part that matters most.

Start with the good news, because it is the biggest part of the story: you are already saving for retirement, automatically, every paycheck. The single hardest thing in investing is starting — and a form did it for you before you had to summon the willpower. Savers who have to opt in often never get around to it; auto-enrollment quietly skips that whole failure point.

The hard part of investing is starting. A form already did that for you — the rest is fine-tuning.

So this is not a “did I make a mistake?” question. You didn’t. It is a “are the two dials set well?” question — and there are only two: which kind of account the money goes into, and how much of your pay goes in. Take them one at a time.

Roth or Traditional is a question about when you pay tax.

The “Roth” in your Roth 401(k) is not a different investment — it is a different tax deal. With Roth, you pay income tax on the money now, on the way in, and never again: not on the contributions, not on decades of growth. Traditional flips the timing — you skip the tax now and pay it later, when you withdraw in retirement. Same dollar, taxed once; the only question is when. The chart below assumes a 22% bracket both now and in retirement, growing for 30 years — same bracket, same ending dollars.

When your bracket is the same now and later, the two land in exactly the same place — that is what the chart shows. The tie breaks on which bracket is higher. And here is why the Roth default they put you in is usually right for someone early in their career: your income now is likely the lowest it will be for a long time. Paying the tax at today’s lower rate, and letting all future growth come out tax-free, is the good side of that trade.

But 3% is a floor, not a finish line.

The second dial is the rate, and this is the one the default sets too low. 3% is the most common starting point a plan drops you at — but your employer’s match almost certainly reaches higher, commonly 4% to 6% of pay. That upper limit is your match ceiling — the most they will add, named in your benefits summary or one quick call to HR. If they match your first 6% dollar-for-dollar and you put in 3%, you collect only half the match; the other 3% of pay they were ready to add is simply never deposited. That is not a missed investment return; it is pay you were offered and left on the table, every single period.

The default won’t climb on its own.

Here is the trap inside auto-enrollment: the same inertia that got you saving also keeps you parked. The risk isn’t 3% this year — it is 3% for the next ten, because changing it requires a decision, and a decision is exactly what the default lets you skip.

That last line is the lever. The best plans don’t rely on you remembering — they turn on auto-escalation, a plan setting that automatically bumps your contribution rate up a percentage point a year until it reaches a healthy target. Savers in those plans put away 20% to 30% more after three years, for no effort beyond a single checkbox at the start. If your plan offers it, switching it on is the closest thing to a raise you can give yourself and then forget about.

One move this week.

Everything above collapses into a single log-in, while the benefits portal HR set up for you is still fresh. Not a research project — one visit, two settings on the same screen.

Raise your contribution to at least the match ceiling. That field is a percentage of your gross pay, so enter the number itself — 6, not a dollar amount. While you are on that screen, switch on auto-escalation if the plan offers it — often labeled “automatic increase” or “step-up rate” — so the rate keeps climbing without you. Leave the Roth setting alone unless you are a high earner expecting a lower bracket later; for most people starting out, the default they chose is already right.

Auto-enrollment made the decision that mattered most — that you save at all. This week you make the two small ones it left for you, and then you can go back to not thinking about it.