I hope this is exactly what you're looking for. The following was copied and pasted from the IRS Retirement plans FAQs on designated Roth accounts, link included here: IRS Retirement Plan FAQs on Designated ROTH Accounts
What happens if I take a distribution from my designated Roth account before the end of the 5-taxable-year period?
If you take a distribution from your designated Roth account before the end of the 5-taxable-year period, it is a nonqualified distribution. You must include the earnings portion of the nonqualified distribution in gross income. However, the basis (or contributions) portion of the nonqualified distribution is not included in gross income. The basis portion of the distribution is determined by multiplying the amount of the nonqualified distribution by the ratio of designated Roth contributions to the total designated Roth account balance. For example, if a nonqualified distribution of $5,000 is made from your designated Roth account when the account consists of $9,400 of designated Roth contributions and $600 of earnings, the distribution consists of $4,700 of designated Roth contributions (that are not includible in your gross income) and $300 of earnings (that are includible in your gross income).
Since I make designated Roth contributions from after-tax income, can I make tax-free withdrawals from my designated Roth account at any time?
No, the same restrictions on withdrawals that apply to pre-tax elective contributions also apply to designated Roth contributions. If your plan permits distributions from accounts because of hardship, you may choose to receive a hardship distribution from your designated Roth account. The hardship distribution will consist of a pro-rata share of earnings and basis and the earnings portion will be included in gross income unless you have had the designated Roth account for 5 years and are either disabled or over age 59 ½.
Please remember that since you are rolling from a 401(k) to a Roth, you will need to pay tax on the amount that is rolled over since you were never taxed on the amount you contributed to the 401(k).
This is NOT double taxation, the amount you contributed to the 401(k) made your taxable income LESS in the year you contributed since it lowered your taxable income.
Roth contributions are after tax, meaning you paid income tax on the amount you contributed.
401(k) contributions are pre tax, meaning you did NOT pay income tax on the amount you contributed.
I can assure you that TurboTax will handle the taxation of the withdrawal correctly. Just be sure to read all the questions you're asked carefully before answering. If you're using Desktop, use step-by-step mode, NOT forms. Step-by-step mode will help you with situations you aren't fully versed on to calculate the proper tax.
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