Just make sure that NONE of your IRA accounts have pre-tax contributions or you WILL owe tax on a prorate portion of the $10,000 you want to roll over. People have asked me if they can do this and they've suggested that they'll use a different IRA account for the non-deductible contributions and just roll that over. This CAN'T be done. You MUST consider ALL of your IRA funds when considering a rollover of just ONE account.
If you do have IRA accounts with pre-tax contributions or earnings and your employer plan allows employees to roll their pre-tax IRA monies into the employer plan, you can do that leaving ONLY the after-tax contributions within your IRA and then roll to a ROTH without a tax issue.
Make sure you run this by your CPA!
This first appeared on Dentaltown.