Delaware Quarterly Tax Estimate Calculator — 2026

Estimate your quarterly tax payments to avoid IRS underpayment penalties. Get your personalized 1040-ES payment schedule.

Quick Delaware Tax Estimate

Based on Delaware's tax rates for 2026. Enter your details for a personalized calculation.

State Tax on $80K Profit
$1,958.27
SE Tax
$11,303.64
Effective Rate
22.6%
Marginal Rate
12%
Full Delaware Tax Calculator →

Delaware Tax Information

State Income TaxYes
Top Marginal Rate7%
Sales Tax0%
LLC Filing Fee$0
Annual Report Fee$None
Standard DeductionN/A

Self-employed pay both federal and Delaware state tax.

Delaware Income Tax Brackets (2026)

Tax RateFromTo
0%$0$2,000
2.2%$2,000$5,000
3.9%$5,000$10,000
4.8%$10,000$20,000
5.2%$20,000$25,000
5.6%$25,000$60,000
6.6%$60,000No limit

Delaware Quarterly Tax Deadlines

Q1
Apr 15
Q2
Jun 16
Q3
Sep 15
Q4
Jan 15

Frequently Asked Questions

When are quarterly taxes due in Delaware?
Federal quarterly deadlines: April 15 (Q1), June 15 (Q2), September 15 (Q3), January 15 (Q4). Delaware follows the same schedule for state estimated payments.
How do I calculate quarterly taxes in Delaware?
Estimate your annual income, subtract deductions, calculate tax, and divide by 4. Or use the safe harbor method: pay 100% of last year's tax (110% if AGI > $150K). Our calculator above does this automatically.
What happens if I miss a quarterly payment in Delaware?
The IRS charges interest on underpayments (currently 8% annual rate). Delaware may impose additional penalties. Even partial payments reduce your penalty.
Can I skip quarterly payments in Delaware?
You can skip if you expect to owe less than $1,000 total, had zero tax liability last year, or your withholding covers 90%+ of this year's tax. Otherwise, skipping triggers penalties.
How do I pay quarterly taxes online in Delaware?
Pay federal taxes via IRS Direct Pay (free), EFTPS, or credit card (fees apply). Pay Delaware taxes through the state Department of Revenue website.