You may not need to pay more.
The IRS knows that people who aren't working a traditional W-2 job might have irregular income. So they offer a little leeway and won't punish you if you're a little short.
The estimated safe harbor rule has three parts:
- If you expect to owe less than $1,000 after subtracting your withholding, you're safe.
- If you pay 100% of your tax liability for the previous year via estimated quarterly tax payments, you're safe. If your adjusted gross income for the year is over $150,000 then it's 110%.
- If you pay within 90% of your actual liability for the current year, you're safe.
Answers are correct to the best of my ability but do not constitute legal or tax advice.
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