Delaware Income Tax Calculator
Estimate your 2025 Delaware state and federal income tax. Includes Delaware tax brackets, a worked dollar example, and filing tips.
Delaware State Income Tax Overview
Delaware imposes a graduated state income tax with six brackets ranging from 0% to 6.6%. Income up to $2,000 is exempt, and the top rate of 6.6% applies to income above $60,000. Delaware is known as a tax-friendly state for retirees — there is no sales tax statewide, and the state offers a significant pension exclusion of up to $12,500 for residents 60 and older. The standard deduction is $3,250 for single filers and $6,500 for married couples filing jointly. Delaware also allows a personal credit of $110 per exemption claimed.
Delaware Income Tax Brackets (2025)
These are the Delaware state income tax brackets for single filers. Only the income within each bracket is taxed at that rate — not your entire income.
| Taxable Income | Tax Rate |
|---|---|
| $0 – $2,000 | 0% |
| $2,000 – $5,000 | 2.2% |
| $5,000 – $10,000 | 3.9% |
| $10,000 – $20,000 | 4.8% |
| $20,000 – $25,000 | 5.2% |
| $25,000 – $60,000 | 5.55% |
| Over $60,000 | 6.6% |
Source: Delaware Division of Revenue. Brackets shown are for single filers. Married filing jointly thresholds may differ.
What a Delaware Resident Actually Pays: A Worked Example
Your effective tax rate is almost always lower than your top bracket. Here is how the math works for a single filer earning $65,000.
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Frequently Asked Questions — Delaware Income Tax
Does Delaware have a state income tax?
Yes. Delaware imposes a state income tax with a top marginal rate of 6.6%. This is separate from your federal income tax obligation.
What is the Delaware income tax rate for 2025?
Delaware uses a graduated income tax system with rates from 2.2% to 6.6%. Only the income within each bracket is taxed at that bracket's rate — not your entire income.
Do I have to file a Delaware state tax return?
Most full-year Delaware residents with income above the state filing threshold must file a state return. Check the Delaware Division of Revenue for current thresholds and requirements.
How accurate is this Delaware state tax estimate?
This is a planning estimate. The state result uses Delaware's published brackets but does not account for all state deductions, credits, exemptions, or local taxes. Verify with official Delaware tax forms or a qualified tax professional.
Does this calculator include federal income tax?
Yes. The results show your estimated Delaware state income tax and your federal income tax using 2025 federal brackets — your full combined picture in one place.
Where can I find official Delaware tax forms?
Official forms, instructions, and filing guidance are available at the Delaware Division of Revenue.
Understanding Your Delaware Tax Estimate
Your results show both your estimated federal income tax and your estimated Delaware state income tax as a combined picture. Here is how to read them and what to do next.
Federal vs. State Tax: Two Separate Bills
Federal income tax is owed to the IRS and is the same rate schedule for all U.S. residents regardless of where you live. Delaware state income tax is a separate obligation paid to the Delaware Department of Revenue. You file two separate returns — one federal (Form 1040) and one state — though they are often prepared together using tax software.
How the Estimate Is Calculated
This calculator applies the 2025 federal tax brackets to your taxable income (gross income minus the standard or itemized deduction), then applies Delaware's published state brackets to estimate your state liability. The result is a planning estimate — not a filed return. It does not account for all credits, deductions, or individual circumstances that could change your actual bill.
Marginal Rate vs. Effective Rate
Your marginal rate is the rate on your last dollar of income — it is the highest bracket you reach, not what you pay on all income. Your effective rate is your total tax divided by gross income, and is almost always meaningfully lower. For example, a single filer earning $75,000 may be in the 22% federal bracket but pay an effective federal rate of only 14-15%. The same principle applies to Delaware state brackets.
3 Ways to Reduce Your Delaware Tax Bill
- Maximize pre-tax retirement contributions. Traditional 401(k) and IRA contributions reduce your federal taxable income. Many states, including Delaware, also exclude these contributions from state taxable income, reducing both bills simultaneously.
- Claim all applicable deductions and credits. Many states offer credits for property taxes, dependent care, education, and energy-efficient home improvements that are separate from federal credits. Check the Delaware Division of Revenue for Delaware-specific credits.
- Consider the standard vs. itemized deduction. Some states allow itemized deductions even if you take the federal standard deduction — or have their own standard deduction amounts that differ from federal. Checking the state-specific rules can sometimes reveal additional savings.
What to Do After Getting Your Estimate
- If you expect to owe money, consider adjusting your W-4 withholding or making a state estimated tax payment to avoid a balance due at filing time.
- If you are self-employed, your SE tax is separate — use our self-employment tax calculator to estimate that additional obligation.
- To verify your numbers, use the official Delaware tax forms or consult a qualified tax professional familiar with Delaware tax law.
Disclaimer: Estimates for educational purposes only. State tax results are approximations based on published bracket data and do not account for all deductions, credits, exemptions, local taxes, or individual situations. Not tax, legal, or financial advice. Consult the Delaware Division of Revenue or a qualified tax professional for guidance specific to your situation.