How to Pay Delaware State Taxes and What Happens If You Miss a Payment
Where and how to pay Delaware state income tax
Delaware collects state income tax through the Delaware Division of Revenue, and you can pay online, by mail, or through your employer's payroll system. Most people pay through withholding — your employer deducts tax from each paycheck and sends it to the state. If you owe additional tax when you file your return, or if you're self-employed, you pay the balance directly.
The easiest method is the state's online payment portal at revenue.delaware.gov. You can pay with a debit card, credit card, or electronic bank transfer (ACH). If you pay by credit card, a processing fee applies — typically 2.49% of the amount. Bank transfers have no fee. You can also mail a check to the Delaware Division of Revenue with a payment voucher, though mail takes longer and the state processes it based on the postmark date, not arrival date.
Self-employed people and those with income not subject to withholding make quarterly estimated tax payments on April 15, June 15, September 15, and January 15. You can pay these the same way — online, by mail, or through the state portal. Missing a quarterly payment doesn't automatically trigger a penalty, but underpaying across the year can result in an underpayment penalty when you file your annual return.
Key Takeaways
- Delaware state income tax is paid through the Division of Revenue online portal, by mail, or through employer withholding, with no fee for bank transfers but a 2.49% fee for credit card payments.
- Self-employed people and those without withholding must make quarterly estimated payments on April 15, June 15, September 15, and January 15 each year.
- Late payments trigger a penalty of 0.5% per month of the unpaid tax, plus interest that compounds daily at a rate set by the state each quarter.
- If you cannot pay in full by the deadline, you can request a payment plan through the Division of Revenue, which typically allows 12 to 60 months depending on the amount owed.
- The state can place a lien on your property, garnish wages, or intercept tax refunds if you do not pay or arrange a plan within a certain period.
What penalties and interest cost you
If you do not pay by the deadline, Delaware charges a failure-to-pay penalty of 0.5% of the unpaid tax for each month (or part of a month) the payment is late. That means if you owe $1,000 and pay 30 days late, you owe an extra $5 in penalty. The penalty caps at 25% of the unpaid tax, so it will not grow forever, but it compounds monthly.
On top of the penalty, the state charges interest on the unpaid balance. The interest rate changes quarterly and is based on the federal short-term rate plus 3%. For 2024, the rate is set each quarter by the state — check revenue.delaware.gov for the current rate. Interest accrues daily and is calculated on both the original tax owed and any penalties already added. Unlike the penalty, interest has no cap and continues to grow as long as the debt remains unpaid.
If you file your return late in addition to paying late, you may face a separate failure-to-file penalty of 5% per month (capped at 25%), though this is waived if you have a refund coming. The combination of penalties and interest can easily double what you originally owed within a year.
Payment plans and what to do if you cannot pay in full
If you cannot pay the full amount by the deadline, contact the Delaware Division of Revenue Collections Unit before the due date if possible. The state offers installment agreements that typically run 12 to 60 months, depending on how much you owe. You can request a plan online through the revenue portal, by phone at (302) 577-8660, or by mail.
To set up a plan, you will need to provide your tax ID (Social Security number or EIN), the tax year in question, and the amount owed. The state will calculate a monthly payment based on the total debt and your requested timeline. You will still owe interest and penalties on the unpaid balance, but a payment plan stops the state from taking collection action like wage garnishment or property liens while you are making regular payments.
If you miss a payment on the plan, the agreement can be cancelled and collection action resumes. If your financial situation changes and you cannot keep up with the payments, contact the Collections Unit again — they may modify the plan, though this is not may provide. Staying in contact is critical; ignoring the debt will result in enforcement action.
Liens, wage garnishment, and other collection actions
If you do not pay or arrange a plan, Delaware can file a tax lien against your property. A lien is a legal claim that gives the state a right to your assets if you sell property or refinance a mortgage. It appears on your credit report and makes it difficult to borrow money. The state can file a lien without a court order and without notifying you in advance, though you will receive notice after it is filed.
The state can also garnish your wages, meaning it orders your employer to send a portion of your paycheck directly to the state to pay the debt. Wage garnishment can take up to 25% of your disposable income (after taxes and certain deductions). Your employer is required to comply, and you cannot be fired for a single garnishment, though multiple garnishments can create workplace complications.
Delaware can also intercept your state income tax refund and apply it to any unpaid state tax debt. If you are owed a federal refund, the state can refer your debt to the federal Treasury Offset Program, which allows the federal government to intercept your federal refund as well. These actions happen automatically once the debt reaches a certain age and amount; you do not have to be sued first.
How to check what you owe and get payment records
You can check your Delaware tax account balance online through the Division of Revenue taxpayer portal at revenue.delaware.gov. Log in with your tax ID and password. The portal shows any unpaid balances, payment history, and the current interest and penalty amounts. If you do not have a portal account, you can create one using your Social Security number or EIN and a valid email address.
If you need a payment history or want to verify that a payment was received, you can request a transcript from the Division of Revenue. Call (302) 577-8660 or submit a written request by mail. Processing typically takes 5 to 10 business days. Keep your own records of payments — save confirmation numbers from online payments and keep copies of cancelled checks or bank statements showing the payment date and amount.
Amended returns and correcting overpayments
If you filed a return and later discover you made an error, you can file an amended return using Form 1040-X (federal) and the corresponding Delaware form. You have three years from the original due date to file an amended return and claim a refund of overpaid tax. If you discover you underpaid, filing an amended return voluntarily before the state contacts you may reduce or eliminate penalties, though interest will still be owed.
If the state determines you overpaid, it will issue a refund or allow you to apply the overpayment to next year's tax liability. Refunds are typically issued within 4 to 8 weeks of processing. If you are owed a refund but also owe other state debts (such as child support or student loans), the state may intercept the refund to pay those debts first.
Frequently Asked Questions
What if I move out of Delaware — do I still owe state income tax?
You owe Delaware income tax on income earned while you were a resident. If you move to another state mid-year, you file a part-year resident return for Delaware and a resident return for your new state. Both states may tax the same income, but you typically receive a credit on one return to avoid double taxation. Contact both states' revenue departments to confirm your filing requirements.
Can I pay my Delaware tax bill with a credit card without a fee?
No. Credit card payments through the state portal incur a 2.49% processing fee. Bank transfers (ACH) and checks have no fee. If you use a credit card, the fee is added to your bill, so you pay more than if you transferred funds directly from your bank account.
What happens if I file my return on time but pay late?
You will owe the failure-to-pay penalty (0.5% per month) and interest on the unpaid balance, but you will not owe the failure-to-file penalty. Filing on time shows good faith and stops one type of penalty from accruing. However, penalties and interest still apply to the unpaid tax itself.
How long does a tax lien stay on my record?
A Delaware tax lien remains on file for 10 years from the date it is filed, though it can be released earlier if you pay the debt in full. Even after 10 years, if the debt is not paid, the state can file a new lien. Paying the debt is the only way to remove the lien before the 10-year period ends.
Can I get my penalties waived if I have a good reason for paying late?
Delaware may waive or reduce penalties for reasonable cause — such as serious illness, a death in the family, or reliance on incorrect professional advice — but you must request this in writing and provide documentation. Contact the Division of Revenue Collections Unit to discuss your situation. Approval is not may provide, and interest will still be owed regardless of penalty relief.