TD Ameritrade is my experience. You get to do it online and choose your withhold amounts for State and Federal withholding. If I would have chosen $0 to with with hold it would have been added to my tax liability on my 22 returns. I did this in December of 22 and received a healthy refund on my tax returns. I figured the government holding my money with zero interest would be a better deal than watch it shrink or break even in the stock market for 3 months. The three reasons I did the conversion. It looks as though I might be in a higher tax bracket when I retire and my portfolio value was down as well as I was going to have a healthy tax bill for my 2022 returns. I converted 10% of my regular IRA to my ROTH. I have retirement horizon of less than 5 years, I guess that is the 4th factor of consideration. Generally speaking, I dont think a conversion would be wise to do a with a retirement date more than 10 years away. There are exceptions to every circumstance/guideline.