Delaware Unemployment Tax: Rates, Filing, and Successor Liability

Delaware employers fund the state’s unemployment insurance program through a quarterly tax on each employee’s wages, capped at a taxable wage base that started phasing in at $12,500 in 2025. The Delaware unemployment tax rate depends on whether you are a new employer, an experienced employer with a claims history, or a delinquent employer who missed a filing. On top of the base rate, every employer owes two smaller assessments and a separate federal unemployment tax. Missing the September 30 delinquency cutoff can push your rate to 6.3% for the following year, so the filing calendar matters as much as the math.

Which Employers Owe the Tax

Title 19, Chapter 33 of the Delaware Code sets two independent liability triggers. Tripping either one makes a business responsible for the tax. The payroll test: paying $1,500 or more in gross wages during any calendar quarter. The employment test: employing at least one person for any part of a day in each of 20 different weeks within a calendar year, regardless of how much you paid them. Meeting either threshold in the current or preceding calendar year is enough.¹

Two industries use different numbers. Agricultural employers become liable if they employ ten or more workers or pay $20,000 or more in cash wages in any calendar quarter. Domestic employers (people who hire household workers such as nannies or housekeepers) become liable when they pay $1,000 or more in cash wages in any quarter.²

One boundary worth flagging: 501(c)(3) nonprofits are not required to pay the quarterly tax. Under federal law they can elect instead to reimburse the state dollar-for-dollar for benefits actually paid to former employees. The election is filed with the Division of Unemployment Insurance, and it can save money for nonprofits with low turnover.

Rates and the Taxable Wage Base

The tax applies only up to a capped amount of each employee’s annual wages. House Bill 433, signed in 2024, restructured the wage base with a three-year phase-in beginning at $12,500 for 2025. Because the cap shifts during the transition, check the current wage base on the Division of Unemployment Insurance’s employer services page each January. Anything an employee earns above the cap is exempt.

Your rate depends on where your business sits in the system:

New employers. HB 433 set the standard new employer rate at 1%. Construction firms in NAICS categories 236, 237, and 238 are the exception: they pay either the average rate in their specific NAICS category or the average construction rate across all three, whichever is higher.²
Experienced employers. Once your business has enough payroll history, the state assigns a rate based on your own claims record. For 2026, experienced employer rates come from Table B with an assessment history cost multiplier (AHCM) of 0.95.
Delinquent employers. Any employer who fails to file required reports or pay assessments due by September 30 of the prior year is assigned a 6.3% rate on taxable wages for the following 12 months.¹

Two smaller charges sit on top of the base rate. Every employer owes a training tax of 0.15% on taxable wages.³ For 2026, Delaware also bills a separate operations and technology tax of 0.2%, which is no longer bundled into the UI rate and instead appears as its own quarterly line. Both are mandatory and both show up on your quarterly report.

How Benefit Charges Move Your Rate

Experience rating is the biggest factor in whether your rate hugs the minimum or drifts toward the maximum. When a former employee files a claim, the Division traces back to that person’s base period employers and charges each one a proportional share of the benefits paid. If the claimant worked only for you during the base period, your account absorbs 100% of the charges. If they worked for several employers, the charges are split based on each employer’s share of the total gross wages paid during that base period.⁴

Once you have paid wages in at least two fiscal years (July 1 through June 30) before the July 1 computation date, the state assigns an experience rate based on the ratio of benefit charges to taxable wages over the three prior fiscal years. A high ratio pushes your rate up. A low ratio pulls it down. That is why contesting improper claims is worth the effort: every dollar charged to your account shapes what you pay the following year.⁴

Registering With the Division

Before you can file anything, you need an employer account number. Registration runs through Form UC-1, “Report to Determine Liability and If Liable Application for Employer Account Number.” The form must be completed and returned within 10 days of receipt, whether or not you believe you meet the liability thresholds.⁵

You will need your Federal Employer Identification Number, your legal business name and any trade name, physical and mailing addresses, the exact date you first paid wages in Delaware, and a description of your business activity. That description drives your NAICS code, and the NAICS code drives your initial rate. Construction employers get a different initial rate calculation than everyone else, and a wrong classification can quietly cost you for years before an audit catches it.

Filing Quarterly Reports and Making Payments

Once the account is active, you file a quarterly tax and wage report on Form UC-8/8A. The report lists total gross wages paid to each employee for the quarter, the excess above the taxable wage base, and the taxable wages that remain. Multiply taxable wages by your assigned rate and that is the tax due.

Reports and payments are due by the last day of the month after each calendar quarter ends:

First quarter (January through March): April 30
Second quarter (April through June): July 31
Third quarter (July through September): October 31
Fourth quarter (October through December): January 31

The Division occasionally extends a specific quarter’s deadline, and those announcements appear on the Online Employer Services portal, which is also where you file and pay electronically.⁶ Each report requires individual Social Security numbers and wage totals, so payroll records need to be organized well before the filing date.

Penalties, Interest, and the Delinquent Rate

Late payments carry interest at 18% per year, calculated at 1.5% per month from the due date. A $5,000 balance that sits unpaid for three months adds $225 in interest before anything else.

The bigger risk is the delinquent employer rate. If you fail to file required reports or pay assessments due by September 30 of the prior year, the Division reclassifies you as delinquent and assigns a 6.3% rate on all taxable wages for the following 12 months.¹ For an employer who would otherwise be at or near the minimum, that can be several times the normal rate. It is one of the most expensive mistakes possible under this program, and it happens by letting one filing slip past September 30.

State delinquency also spills over to federal tax. Every employer subject to Delaware’s unemployment tax also owes the Federal Unemployment Tax Act (FUTA) tax at 6.0% on the first $7,000 of each employee’s annual wages. Employers who pay their state taxes on time claim a credit of up to 5.4%, cutting the effective FUTA rate to 0.6%, or about $42 per employee per year.⁷ If Delaware reports your account as delinquent, the IRS can reduce or deny that credit, pushing your FUTA rate back toward 6.0%. FUTA is reported annually on IRS Form 940, separate from your state quarterly filings. Delaware is not currently on the federal credit reduction list.

Successor Liability When You Buy a Business

Acquiring an existing Delaware business does not give you a clean unemployment account. The Division treats the buyer as a successor employer, and the effect depends on whether you were already a Delaware employer when you bought the business.

When an existing employer acquires another employer’s business and there is common ownership, management, or control between them, the acquired business’s unemployment experience transfers to the buyer. Both employers’ rates are recalculated as of the transfer date.⁸ Starting the following January 1, the successor’s rate reflects the combined benefit charges and taxable wages of both businesses.⁴

The successor is also liable for all unpaid contributions, interest, and penalties the predecessor owed at the time of transfer. That is the piece that catches buyers off guard. Before closing, request the seller’s unemployment tax account status from the Division so any outstanding balance surfaces before it becomes yours.⁴

Delaware also has anti-SUTA-dumping rules. If someone who was not already an employer buys a business primarily to inherit a lower rate, the Division denies the experience transfer and assigns the new employer rate instead.⁸

Records You Need to Keep

Federal law requires employers to keep employment tax records for at least four years after the tax becomes due or is paid, whichever is later.⁹ For Delaware unemployment purposes, that means quarterly reports, wage detail, proof of payment, and any correspondence with the Division. If the Division audits your account or a former employee disputes a benefit charge, those records are what you use to defend your position. Four years is the federal floor; six years gives you room for late claims and amended assessments.

1
Delaware Code Online. Delaware Code Title 19 – Unemployment Compensation
2
Delaware Department of Labor. Unemployment Insurance
3
Cornell Law Institute. 19 Del. Admin. Code 1202-19.0 – Employment Training Tax
4
Delaware Department of Labor. Employer FAQs
5
Delaware Department of Labor. Report to Determine Liability and If Liable Application for Employer Account Number
6
Delaware Department of Labor. Online Employer Services
7
Internal Revenue Service. Topic No. 759, Form 940, Employers Annual Federal Unemployment Tax Act (FUTA) Tax Return
8
Delaware Code Online. Unemployment Compensation – Delaware Code Title 19 Chapter 33 Subchapter III
9
Internal Revenue Service. Topic No. 305, Recordkeeping