Your job won't know about the other job or if you have self employment income. You can change the W4 at work to increase your withholding. Or you can send in extra quarterly estimated payments to cover the difference.
You must make quarterly estimated tax payments for the current tax year if both of the following apply:
- 1. You expect to owe at least $1,000 in tax for the current tax year, after subtracting your withholding and credits.
- 2. You expect your withholding and credits to be less than the smaller of:
90% of the tax to be shown on your current year’s tax return, or
100% of the tax shown on your prior year’s tax return. (Your prior year tax return must cover all 12 months).
The four 1040ES quarterly estimates are due
April 15, 2024
June 17, 2024
Sept 16, 2024
Jan 15, 2025
Your state will also have their own estimate forms.
How to make the Estimated payments
https://ttlc.intuit.com/community/tax-payments/help/how-do-i-make-estimated-tax-payments/00/25875
Here are the blank Estimates and instructions…..
https://www.irs.gov/pub/irs-pdf/f1040es.pdf
Or you can pay on the IRS website. Be sure to pick 2024 1040ES payment
https://www.irs.gov/payments
