If you are filing a joint return, then you would include both of your income for 2024 and should be able to identify the amounts received in the applicable time periods.
You could also opt to let the IRS calculate the penalty.
The law allows the IRS to waive the penalty if:
- You didn't make a required payment because of a casualty event, disaster, or other unusual circumstance and it would be inequitable to impose the penalty, or
- You retired (after reaching age 62) or became disabled during the tax year or in the preceding tax year for which you should have made estimated payments, and the underpayment was due to reasonable cause and not willful neglect.
For more information, refer to Penalties and the Instructions for Form 2210 PDF
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