Some of your contributions are nondeductible for the Roth conversion. The TSP were payroll deductions, so they were deducted from your pay before taxes. They act like a 401k, so they would not have been deductible. If you did not deduct the 2022 contribution, you want to make sure you filed the Form 8606- otherwise the contributions are not considered nondeductible even if you did not deduct them. For this conversion, the prorata rule would apply, because the TSP is taxable income.
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