For taxpayers planning quarterly estimated tax payments
Calculate your required quarterly estimated tax payments to avoid IRS underpayment penalties. Understand safe harbor rules and see your payment schedule.
Quarterly Payment
$4.25K
Total Tax for Year
$28.4K
Already Covered
$8.00K
Your estimated $28,393 annual tax is covered by $8,000 in withholding/payments. Pay $4,250 quarterly to meet safe harbor requirements.
The IRS requires quarterly estimated tax payments if you expect to owe $1,000+ after withholding. To avoid penalties, you must pay at least the lesser of: 90% of current year tax, OR 100% of prior year tax (110% if prior year AGI exceeded $150,000).
Quarterly due dates are April 15, June 15, September 15, and January 15 (of the following year). Self-employment tax (15.3%) applies to Schedule C income up to the annual Social Security wage base.
Quarterly Payment
$4.25K
Total Tax for Year
$28.4K
Already Covered
$8.00K
Your estimated $28,393 annual tax is covered by $8,000 in withholding/payments. Pay $4,250 quarterly to meet safe harbor requirements.
The IRS requires quarterly estimated tax payments if you expect to owe $1,000+ after withholding. To avoid penalties, you must pay at least the lesser of: 90% of current year tax, OR 100% of prior year tax (110% if prior year AGI exceeded $150,000).
Quarterly due dates are April 15, June 15, September 15, and January 15 (of the following year). Self-employment tax (15.3%) applies to Schedule C income up to the annual Social Security wage base.
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Safe Harbor = min(Current Year Tax × 90%, Prior Year Tax × (AGI > $150K ? 110% : 100%)); Required Quarterly = Safe Harbor ÷ 4
Calculates the minimum required annual payment to avoid underpayment penalties using IRS safe harbor rules. The lower of 90% current year or 100%/110% prior year satisfies the requirement.
The IRS requires taxpayers to pay taxes throughout the year through withholding or estimated payments. If you don't pay enough, you face underpayment penalties - essentially interest on what you should have paid.
The safe harbor rules provide protection: pay at least 90% of your current year tax or 100% of your prior year tax (110% if AGI exceeded $150,000), and you avoid penalties even if you owe at filing.
Quarterly payments are due April 15, June 15, September 15, and January 15. These dates don't align with calendar quarters, so mark your calendar. Late payments trigger penalties calculated from each due date.
Contractor with $50,000 estimated tax, $35,000 prior year
Safe harbor: $35,000 (100% prior year). Required quarterly: $8,750
Professional with $80,000 estimated tax, $60,000 prior year, high AGI
Safe harbor: $66,000 (110% prior year due to high AGI). Required quarterly: $16,500
The safe harbor protects you from underpayment penalties. You're safe if you pay at least 90% of current year tax OR 100% of prior year tax (110% if prior year AGI exceeded $150,000). Pay the lesser of these two amounts each quarter.
W-2 withholding counts toward your estimated tax requirement. If your withholding covers your safe harbor amount, you may not need to make estimated payments. You can also request additional W-2 withholding to cover non-wage income.
Penalties are calculated separately for each quarter based on the underpaid amount and number of days until payment. The penalty rate is the federal short-term rate plus 3%. Even if you pay the full amount by April 15, you may owe penalties for earlier quarters.
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