How a Roth conversion actually works

A Roth conversion means moving money from a traditional IRA, SEP-IRA, SIMPLE IRA, or a 401(k) into a Roth IRA. You withdraw the money from the old account, pay income tax on it in that tax year, and deposit it into the Roth account. The money then grows tax-free, and you can withdraw it tax-free in retirement if you follow the rules.

The conversion itself takes a few days to a few weeks depending on your bank or brokerage. The tax bill comes later — you report the conversion on your tax return for that year. There is no government approval process; you initiate it directly with your financial institution.

Key Takeaways

  • You initiate a conversion by contacting your current IRA or 401(k) provider and requesting a direct transfer to a Roth IRA at the same or different institution.
  • The amount you convert is taxable income in the year you convert it, and you owe tax on the full amount even if you do not receive the money in cash.
  • A direct trustee-to-trustee transfer avoids the 60-day rollover deadline and withholding complications that come with taking the money yourself.
  • You report the conversion on Form 8606 when you file your tax return; the IRS does not send you a bill separately.
  • Roth conversions are available to anyone with earned income or a traditional IRA balance, regardless of income level.

Step 1: Decide which account to convert from

You can convert from a traditional IRA, SEP-IRA, SIMPLE IRA (after two years of participation), or a 401(k) or 403(b) if your employer plan allows it. Check your plan documents or call your plan administrator to confirm whether conversions are permitted. Many employer plans do allow them, but some do not.

If you have multiple traditional IRAs, you can convert from one, some, or all of them. If you have both a traditional IRA and a SEP-IRA, understand that the IRS treats all your traditional IRAs as a single account for tax purposes when you convert — this matters if you have pre-tax and after-tax money mixed together, because you cannot convert only the after-tax portion.

Step 2: Open a Roth IRA if you do not have one

You need a Roth IRA account to convert into. If you already have one, you can skip this step. If you do not, open one at the same financial institution where your traditional IRA sits, or at a different one — it does not matter.

Opening a Roth IRA takes 10 to 20 minutes online or by phone. You will need your Social Security number, address, and employment information. There is no cost to open the account. Once it is open, you can proceed with the conversion.

Step 3: Request a direct trustee-to-trustee transfer

Contact your current IRA or 401(k) provider and tell them you want to do a Roth conversion. Ask for a direct trustee-to-trustee transfer — this means the money goes straight from your old account to your new Roth IRA without passing through your hands. This is the cleanest method and avoids the 60-day rollover rule.

You will need to provide your Roth IRA account number and the routing and account information for the institution holding your Roth. Your old provider will send the money directly. The transfer usually takes three to ten business days, though some institutions take longer.

Do not take the money out yourself and deposit it later. If you withdraw the money and miss the 60-day deadline to deposit it in the Roth, the IRS treats it as a failed conversion and a taxable distribution, which can trigger penalties.

Step 4: Understand your tax bill

The amount you convert becomes taxable income in the year you convert it. If you convert $50,000, you owe income tax on $50,000 in that tax year. The tax rate depends on your total income and tax bracket — it could be 10%, 12%, 22%, or higher.

You do not receive a bill from the IRS. Instead, you report the conversion on your tax return using Form 8606 (Nondeductible IRAs). Your tax software or tax preparer will walk you through this. The tax is due when you file your return, typically by April 15 of the following year.

If you converted money that was already after-tax (non-deductible contributions), you do not owe tax on that portion. You will need records showing how much of your traditional IRA balance was after-tax. If you do not have these records, contact your IRA provider for a statement.

Step 5: Plan for the tax payment

You need to have cash available to pay the tax bill when you file your return. If you do not pay it, the IRS will charge interest and penalties. Many people pay the tax from their regular income or savings rather than taking it from the converted amount.

If you want to avoid a large tax bill in one year, you can convert a smaller amount or spread conversions across multiple years. There is no limit on how many conversions you can do or how much you can convert in a single year — the only limit is the size of your account.

What happens after the conversion is complete

Once the money is in your Roth IRA, it grows tax-free. You can withdraw the contributions (the amount you converted) at any time without tax or penalty. You cannot withdraw the earnings tax-free until you are 59½ and have held the Roth for at least five years.

You are not required to take withdrawals from a Roth IRA during your lifetime, unlike traditional IRAs. This makes Roths useful for leaving money to heirs, since they inherit the account tax-free.

Frequently Asked Questions

Can I undo a Roth conversion if I change my mind?

Yes, but only within a specific window. You can recharacterize a conversion (move the money back to a traditional IRA) if you do so by October 15 of the year after the conversion. After that date, the conversion is permanent. Recharacterization is useful if the account value drops after you convert, because you can undo it and reconvert later at a lower value.

Do I have to convert my entire IRA balance?

No. You can convert part of your balance and leave the rest in the traditional IRA. You might convert $20,000 and leave $80,000 behind, for example. This lets you spread the tax impact across multiple years if you want.

What if I have a 401(k) at work — can I convert that?

Only if your employer plan allows in-service conversions. Ask your plan administrator or HR department. If your plan does not allow it, you can convert after you leave the job or retire, when you roll the 401(k) into an IRA first and then convert from there.

Will a Roth conversion affect my Social Security or Medicare?

The conversion itself counts as income in the year you do it, which could affect your Modified Adjusted Gross Income (MAGI). This can push you into a higher tax bracket or affect Medicare premiums or Social Security taxation. Run the numbers with a tax preparer before converting if you are close to these thresholds.

How long does the conversion take from start to finish?

The money transfer takes three to ten business days. Reporting it on your tax return happens when you file, usually by April 15 of the following year. The entire process is complete once you file your return and the IRS processes it, which can take several weeks to months.