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You are mixing up some terms. Rolling over a 401k into an IRA is not a Roth IRA back door.

If you are looking to retire in a few years, it may or may not make sense to maximize your 401k contributions - assuming your intent to roll them to a Roth in the near future.

Note, any money you roll from 401k to a Roth is taxable as income in the year in which you complete the rollover (discounting some very uncommon and small exceptions). Adding more now just makes that a larger taxable event

A "back door Roth" contribution is where you put money into a traditional IRA for which you don't get a tax deduction and then immediately convert it to a Roth - with no tax implications. Since you already have IRA accounts, you would not want to make a back door Roth contribution as your immediate rollover is is taxed pro-rata based on your total IRA holdings.

For example, if you have 100k in your T IRA and you add 5k in an attempt to complete a back door roth contribution, you would not get to roll that 5k over tax free to the Roth. Instead, roughly 95% of that rollover would be taxed as income (5/105 = 0.047% - 1 = ~ 95%), even though you did not claim a tax deduction on the 5k contribution.

If you REALLY want to back door roth contributions, you need to first get rid of those T IRAs by either converting them to Roth accounts now or seeing if you can put them in your 401k.
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