Should I Do Traditional or Roth IRA: The Math Most People Get Wrong

Should I Do Traditional or Roth IRA: The Math Most People Get Wrong

You're standing at a crossroads that involves your future self, the IRS, and a whole lot of guesswork about what the world looks like in thirty years. It's paralyzing. Everyone has an opinion. Your uncle says Roth is the only way to go because "taxes are going up," while your HR department might be pushing the immediate tax break of a Traditional.

Deciding should I do traditional or roth ira isn't just a box to check on a brokerage app. It's a bet. You are essentially gambling on whether you’ll be richer or poorer when you’re 70 than you are today.

Let’s be honest: most of the "expert" advice you see online is way too clinical. They talk about tax brackets like they’re static things, but life is messy. You might have a kid, lose a job, or move to a state with no income tax. All of that changes the math.

The Core Conflict: Pay Now or Pay Later?

The basic difference is simple. With a Traditional IRA, you get a tax break today. If you put in $7,000, you deduct that from your income, and you pay less to the IRS this April. But when you retire and pull that money out, Uncle Sam takes his cut of every single dollar—the original contribution and all that sweet, sweet growth.

Roth IRAs are the opposite. You pay the taxes upfront. You get no deduction today. However, once that money is in the account, it’s yours. All of it. When you’re 65 and you withdraw a million bucks, the IRS doesn't get a penny.

It sounds like a no-brainer, right? Who wouldn't want tax-free money later?

Well, it depends on your "Effective Tax Rate" versus your "Marginal Tax Rate." This is where people get tripped up. When you contribute to a Traditional IRA, you’re saving money at your highest marginal rate—the top percentage of your income. But when you withdraw that money in retirement, it fills up the lower tax brackets first. You might be saving 24% today but only paying an average of 12% when you retire. That’s a massive win for the Traditional IRA.

Why the Roth "Always Wins" Argument is Flawed

There’s this prevailing wisdom that because the national debt is skyrocketing, tax rates must go up. Therefore, Roth is better.

Maybe.

But even if the tax brackets themselves shift upward, you have to consider your personal lifestyle. Many retirees live on significantly less than they earned during their peak career years. If you’re earning $150,000 now but only plan to spend $70,000 a year in retirement, your tax bracket will naturally be lower later, regardless of what Congress does.

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Also, consider the "Time Value of Money." If you use a Traditional IRA and save $2,000 on your tax bill this year, you could—theoretically—invest that $2,000 in a brokerage account. Over 30 years, that extra invested capital might outpace the tax benefits of a Roth. Most people don't actually do this; they just spend the tax refund on a new couch. If you’re the type to spend the savings, the Roth has a built-in "discipline" factor that shouldn't be ignored.

The Income Limits Nobody Mentions Until It’s Too Late

We need to talk about the IRS "Phase-out" rules. They are annoying.

If you have a 401(k) at work, your ability to deduct Traditional IRA contributions starts to vanish once you hit a certain income level. For 2024, if you’re single, that phase-out starts at a modified adjusted gross income (MAGI) of $77,000. For 2025, it’s $79,000. If you make $100,000 and have a 401(k), you can still put money in a Traditional IRA, but you won't get a tax deduction.

At that point, a Traditional IRA is basically useless. You’re better off with a Roth.

But wait. Roth IRAs have income limits too. If you make too much—currently starting around $150,000 for singles—you can't contribute to a Roth directly. This is when people start talking about the "Backdoor Roth IRA." It sounds like something involving a trench coat and a dark alley, but it’s a perfectly legal maneuver where you put money in a non-deductible Traditional IRA and then immediately convert it to a Roth.

The Flexibility Factor (The Secret Roth Weapon)

Life happens. Sometimes you need cash.

One of the biggest arguments for the Roth is that you can withdraw your contributions (not the earnings) at any time, for any reason, without penalty or taxes. You already paid taxes on that money. It’s yours.

If you try to take money out of a Traditional IRA before age 59 ½, the IRS hits you with a 10% penalty plus income taxes. It’s brutal.

While you should never treat your retirement account like a checking account, knowing that your Roth IRA can double as a "break glass in case of emergency" fund provides a psychological safety net that the Traditional IRA just doesn't offer.

High Earners and the "Tax Diversification" Strategy

If you are a high-income professional, you probably think you should maximize your tax breaks now. You're in the 32% or 35% bracket. It feels painful to pay those taxes.

However, there is a risk in having all your money in Traditional accounts (like a 401(k) and a Traditional IRA).

When you turn 73, the government forces you to start taking money out. These are called Required Minimum Distributions (RMDs). If you have $3 million in a Traditional account, your RMDs might be so large that they push you into a high tax bracket, even if you don't need the money. Plus, those withdrawals can make your Social Security benefits taxable and increase your Medicare premiums (IRMAA surcharges).

Having a "bucket" of Roth money gives you options. You can take just enough from your Traditional account to stay in a low tax bracket, then pull the rest of what you need from your Roth. That's "tax diversification." It's about control.

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Real-World Scenarios

Let's look at two different people.

Case A: Sarah, the 24-year-old teacher. Sarah makes $45,000. She’s in a low tax bracket now, but she’ll likely earn more later in her career. For Sarah, the tax deduction today is worth very little. She should almost certainly go Roth. She’s "locking in" a low tax rate on money that has 40 years to grow.

Case B: Mark, the 52-year-old executive. Mark makes $220,000. He’s in his peak earning years. He plans to retire in 10 years and move to a cheaper state. Mark needs the tax break now. By using a Traditional IRA (or a 401(k) if he's over the IRA limit), he saves big on taxes today and will likely withdraw that money when his income is much lower.

What Most People Get Wrong About "The Match"

If your employer offers a match on a 401(k), that's your first priority. Period. It's a 100% return on your money.

But many people ask should I do traditional or roth ira after they've hit their employer match. The general "order of operations" for wealth building usually looks like this:

  1. 401(k) up to the match.
  2. Max out a Roth IRA (for the flexibility and growth).
  3. Go back and max out the rest of the 401(k) or a Traditional IRA.

This isn't a hard rule, but it works for about 80% of people.

The "Tax-Free Legacy" Aspect

If you care about leaving money to your kids, the Roth is the undisputed king.

Inherited Traditional IRAs are a tax headache for heirs. Under the SECURE Act 2.0, most non-spouse beneficiaries have to empty that account within 10 years. If your kids inherit a large Traditional IRA during their own peak earning years, they’re going to lose a massive chunk of it to taxes.

An inherited Roth IRA, however, is a gift from heaven. They still have to empty it within 10 years, but they pay zero taxes on it. You’ve essentially paid their future tax bill for them.

Practical Steps to Decide Right Now

Stop overthinking. The worst thing you can do is contribute to nothing because you're worried about picking the wrong one.

Start by looking at your last tax return. Find your "Taxable Income." If you are in the 10% or 12% bracket, do a Roth. If you are in the 22% or 24% bracket, it’s a toss-up, but Roth is usually safer if you’re young. If you’re in the 32% bracket or higher, lean toward Traditional—if you’re even eligible for the deduction.

Check your employer's plan. Many companies now offer a "Roth 401(k)." This gives you the best of both worlds: high contribution limits and the tax-free growth of a Roth.

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If you're still stuck, split the difference. Put half in each. There’s no law saying you can't have both. Just make sure the total amount you put into all your IRAs doesn't exceed the annual limit ($7,000 for 2024/2025, or $8,000 if you’re 50 or older).

Next Steps:

  1. Verify your MAGI: Use a tax calculator or look at your 2024 return to see if you even qualify for a Traditional deduction or a direct Roth contribution.
  2. Review your workplace plan: See if a Roth 401(k) is an option, which might simplify your decision-making.
  3. Open the account: Whether it's Vanguard, Fidelity, or Schwab, just get the money moving. Time in the market beats "tax optimization" every single time.