Hi @SueGhel! Great question! Happy to help!
I'm assuming, for purposes of this response, that the distribution/withdrawal from your Fidelity account in January will be taxable as income to you (i.e., it wasn't a distribution from a Roth IRA or Roth 401(k)). Assuming that's the case, then the withdrawn amount will be included in your total income for purposes of calculating any tax you might owe on your social security benefits, which you started taking in the same tax year. It doesn't matter that you began taking social security after you took your Fidelity distribution as long as both occurred in the same year.
Here's an article about how and whether social security income is taxable. In short, it depends on your total income, which would include the Fidelity distribution.
I hope this helps!
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