Hi Anchor in the lee, It can be tricky to find that sweet spot to have enough tax withheld so that you do not owe tax and do not receive too large a tax refund! It's always a good idea to review and submit a Form W-4 when you have increased income. Here is a W-4 Calculator that will take you step-by-step through the worksheet,
https://turbotax.intuit.com/tax-tools/calculators/w4/
Once you complete the form, give it to your employer. Then, keep a close eye on your next few paychecks to see how the changes impacted your federal income tax withholding.
I hope this helps!