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• Retirement Accounts
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Technically, none.... sort of.

The deadline for contributing to a Traditional IRA for tax year 2022 is April 18th, 2023.

The convention is to make the Roth conversion as immediately as possible to avoid incurring taxes -- if the after-tax T-IRA contribution grows from 6000 to 7123.56 between the contribution and the conversion, then you need to pay taxes on the difference.

The backdoor consists of two steps. The first step is the contribution, which has annual deadlines. The second step is the conversion, which has no defined deadline (but generally is best done soon after the first step to minimize tax implications).

There is no deadline to convert traditional to Roth. But unlike contributions, which have an overlap period from Jan-April, the conversion always happens in the year it actually happened. So if you don't convert by the end of the day today, it will be a 2023 conversion.

Note if the IRA contribution is non-deductible, it really doesn't matter, as converting doesn't add to your tax.