If you lived in Delaware for all or part of the year, or earned income from a Delaware source while living elsewhere, you likely have to file a Delaware personal income tax return by April 30. The Delaware tax return filing requirements turn on three things: your residency status, how much Delaware-connected income you had, and your age and filing status. Delaware starts from your federal adjusted gross income, then applies its own additions, subtractions, deductions, and credits to figure what you owe.
Who Has to File
Delaware treats you as a resident if you are domiciled in the state, or if you keep a place to live there and spend more than 183 days in Delaware during the tax year.1Justia. Delaware Code Title 30 Chapter 11 Subchapter I Section 1103 – Resident Individual Defined Residents report income from every source, wherever earned. Part-year residents report what they earned while living in Delaware plus any Delaware-sourced income from the rest of the year. Non-residents file if they had Delaware-sourced wages, business income, or rental income, which commonly catches cross-border commuters and out-of-state owners of Delaware rental property.
There is a narrow carve-out for people abroad: if you were physically present in a foreign country for at least 495 days out of any 18 consecutive months, spent fewer than 45 days in Delaware during that stretch, and did not keep a Delaware home where your family lived, you are not treated as a resident for that period.1Justia. Delaware Code Title 30 Chapter 11 Subchapter I Section 1103 – Resident Individual Defined
Income Thresholds
Residents only need to file if Delaware adjusted gross income clears a threshold tied to filing status and age. A single filer under 60 has to file at $9,400. Married couples filing jointly under 60 start at $15,450. Filers 60 and older get higher thresholds because of extra personal credits and pension exclusions; a single filer 65 or older, for example, is not required to file until income exceeds $14,700.
The rule is stricter for everyone else. Part-year residents must file if they had any income from any source while living in Delaware, or any Delaware-sourced income while living elsewhere. Non-residents must file if they had any Delaware-sourced gross income at all. A non-resident spouse with no Delaware income does not need to file a separate return if the other spouse files separately.
The April 30 Deadline and Extensions
Delaware returns are due April 30, a full two weeks later than the federal April 15 date. Do not assume the two deadlines line up. If you need more time, file Form 1027 by April 30 for an automatic extension to October 15.2Delaware Division of Revenue. Delaware Form 1027 – Application for Automatic Extension of Time to File a Delaware Individual Income Tax Return
The extension only buys you time to file, not time to pay. Whatever you estimate you owe is still due April 30. Underpayments accrue interest at one-half percent per month on the unpaid balance from the original due date until paid in full.3Delaware Division of Revenue. Form 1027 Application for Automatic Extension of Time to File Delaware Individual Income Tax Return A rough estimate sent with your extension beats sending nothing.
Which Form to Use
Full-year residents file Form 200-01. Part-year residents and non-residents file Form 200-02, which includes a schedule for apportioning income between Delaware and other states. Both forms are available on the Division of Revenue website for download or online completion.4Division of Revenue – State of Delaware. File Online
Before you start, pull together your completed federal Form 1040 (Delaware’s calculation begins with your federal adjusted gross income), your W-2s, and any 1099s for freelance work, interest, dividends, retirement distributions, or other income.5Justia. Delaware Code Title 30 Chapter 11 Subchapter III Section 1123 – Delaware Adjusted Gross Income If you plan to itemize, keep documentation showing your expenses exceed the standard deduction. The IRS recommends keeping tax records at least three years, and Delaware follows a similar guideline.6Internal Revenue Service. How Long Should I Keep Records
Married couples have more flexibility in Delaware than on the federal return. You can file jointly, separately on individual returns, or as “combined separate,” which puts both spouses on one form while calculating each person’s tax independently. If you file separately or combined separate, both spouses must use the same deduction method (both standard or both itemized), and each reports their own income plus half of any income from jointly titled accounts, securities, or real estate.
How to Submit and Pay
Electronic filing through the Delaware Taxpayer Portal is the fastest route and generally produces a refund within a few weeks.4Division of Revenue – State of Delaware. File Online Paper returns can take several months during peak season.
If you mail your return, Delaware uses a different Wilmington P.O. Box depending on the result:7Division of Revenue – State of Delaware. Mailing Addresses
- Refund returns: P.O. Box 8710, Wilmington, DE 19899-8710
- Balance due returns: P.O. Box 508, Wilmington, DE 19899-0508
- Zero liability returns: P.O. Box 8711, Wilmington, DE 19899-8711
The wrong box delays processing. If you owe, you can pay through the portal or mail a check payable to the Delaware Division of Revenue with a payment voucher and your Social Security number written on the check. After filing, track your refund on the Division of Revenue’s online tool at revenue.delaware.gov.8Division of Revenue – Department of Finance – State of Delaware. Delaware Division of Revenue
Rates and the Adjustments That Shape Your Bill
Delaware’s personal income tax runs through seven brackets. The first $2,000 of taxable income is not taxed, and marginal rates climb from 2.20% to a top rate of 6.60% on income above $60,000.9Justia. Delaware Code Title 30 Chapter 11 Subchapter I Section 1102 – Imposition and Rate of Tax The brackets have not changed since 2014 and are not indexed for inflation.
Because Delaware starts from your federal adjusted gross income, the state-specific additions, subtractions, and credits are where your bill actually gets decided.
Additions and Subtractions
You add back interest from municipal bonds issued by other states; Maryland or Pennsylvania muni interest that was tax-free federally becomes taxable to Delaware. Delaware’s own bond interest stays exempt. On the subtraction side, you remove interest from U.S. government obligations like Treasury bonds and savings bonds, which federal law prohibits states from taxing.10Justia. Delaware Code Title 30 Chapter 11 Subchapter II Section 1106 – Modifications
Retirement Income and Social Security
Social Security and Railroad Retirement benefits are completely exempt from Delaware income tax.11Division of Revenue – State of Delaware. Personal Income Tax FAQs If you are 60 or older, you can exclude up to $12,500 per person in pension and other eligible retirement income combined, including distributions from 401(k) plans, IRAs, Keogh plans, government 457 plans, as well as dividends, interest, capital gains, and net rental income from real property.10Justia. Delaware Code Title 30 Chapter 11 Subchapter II Section 1106 – Modifications Under 60, the pension exclusion is capped at $2,000, though military pensions get the full $12,500 regardless of age.
Personal Credit and EITC
Delaware gives a $110 personal credit for each person on the return, typically you, your spouse on a joint return, and each dependent. Filers 60 and older get an additional personal credit. You cannot claim one if someone else lists you as a dependent on their federal return.
Delaware’s earned income tax credit is 15% of your federal EITC for tax year 2026, split into a refundable portion worth 4.5% of the federal credit and a non-refundable portion worth 20%.12Delaware General Assembly. House Bill 253Delaware Resident Schedules PIT-RSS The refundable piece can come back to you as a check even if you owe no Delaware tax.
Credit for Taxes Paid to Other States
If you live in Delaware but paid income tax to another state on the same income, claim the credit on Delaware Schedule I, listing each state’s credit from highest to lowest.13Delaware Division of Revenue. Delaware Resident Schedules PIT-RSS This matters most for Delaware residents working in Pennsylvania, Maryland, or New Jersey.
DE529 Contribution Deduction
Contributions to Delaware’s DE529 Education Savings Plan reduce your Delaware taxable income by up to $1,000 per individual or $2,000 for joint filers. The deduction is not available if your federal AGI exceeds $100,000 ($200,000 for joint filers).14State of Delaware Office of the State Treasurer. DE529 Education Savings Plan
What Happens If You File or Pay Late
If you owe tax and file late, Delaware charges 5% of the unpaid tax per month, or any fraction of a month, until you file.11Division of Revenue – State of Delaware. Personal Income Tax FAQs If you took an extension but missed the October 15 extended date, the same penalty applies unless you can show reasonable cause.3Delaware Division of Revenue. Form 1027 Application for Automatic Extension of Time to File Delaware Individual Income Tax Return
That 5% monthly late-filing penalty runs on top of the half-percent monthly interest on any unpaid balance, so a return that is both late and unpaid stacks charges on two tracks. If you cannot pay in full, file on time and pay what you can. Filing on time wipes out the 5%-per-month penalty entirely, leaving only the smaller interest charge on the remaining balance.