The reason they offer to withhold for you is that people like having their taxes withheld. It’s convenient. And the government probably mandates they at least offer it. However, the underlying assumption that occurs by Schwab and the government when you do a Roth conversion is that you are converting pre-tax money. That is not the case with the Backdoor Roth IRA process. You are converting after-tax money. There is no tax due. So if you end up withholding tax, you just end up with less in your Roth IRA. Even if you were doing a Roth conversion of pre-tax money, you’d want to pay that tax bill from somewhere else if you could rather than the IRA. Witholding taxes represents a withdrawal from your IRA, which may generate taxes and penalties. Make your life easy and don’t have anything withheld from your Roth conversion. Trust me. , That's when you can turn to the Backdoor Roth IRA process to indirectly contribute to your Roth IRA. You do that by contributing to a traditional IRA (again, a maximum of $6,500 for 2023), and then a few days after that money hits your account, you transfer the money from the traditional IRA to the Roth IRA that you've already set up., To get around these limits, some investors opt to convert their way into a Roth account using a two-step process. It works like this: Open a traditional IRA and make after-tax contributions to it. For 2024, you're allowed to contribute up to $7,000 ($8,000 if you're age 50 or older) per year. Make sure you file IRS Form 8606 every year you do this. Rollover the assets from the traditional IRA .