It depends because the lookback can affect your child tax credit as well as the earned income credit. You can claim the child tax credit when you are Married Filing Separately. To claim however, you do need to determine what your portion of your taxable income was in 2019 on your joint return.
if you live in a community property state, this calculation can become challenging because all income is divided equally. Please review this IRS publication regarding community property rules but most importantly, a list of the community property states that require this type of reporting.
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