According to turbotax i over contributed to my traditional and roth IRAs. how can I fix this without penalty? THose are in TSP

[dmertz]

Your accounts in the federal TSP are not IRAs.  Go back and remove the entries you made for these contributions under Deduction  & Credits.

Enter amounts shown in box 12 of your W-2 only in box 12 of TurboTax's W-2 form, nowhere else in TurboTax.

[Opus 17]

TSP is not an IRA or a Roth IRA. Qualified workplace retirement programs are governed by completely different sections of the tax law then IRAs and follow completely different rules. Even though they have a similar purpose.  When TurboTax asks if you made contributions to an IRA or a Roth IRA, only report contributions that you sent out of your own money to a private bank or brokerage where you had established an IRA. Do not include money that was deducted by payroll deduction and placed in a workplace plan.

if you did not make contributions to a real IRA, then go back in TurboTax and change your answers. If you did make a contribution to a private IRA and it is considered excess because it is more than you were eligible for, you must remove the excess contribution before April 15 or pay a 6% penalty tax.