Photo of Spiros Mantzavinos
D Delaware Senate · District 7 On the 2026 ballot

Sen. Spiros Mantzavinos

Compare
Total votes
2,845
all sessions
Attendance
98%
65 missed
Near the chamber average
With party
99%
of cast votes
Higher than 81% of chamber peers
Bipartisan score
0%
crosses aisle rarely
Lower than 87% of chamber peers
Sponsored
1,281
bills & resolutions
Higher than 91% of chamber peers
Committees
7
assignments
1,281 bills and resolutions

Sponsored bills

Total
1,281
Primary
1,083
Co-sponsor
198
This page
1,281
matching current filters
Primary HB 242
Signed into law · Delaware House · Lead sponsor
AN ACT RELATING TO LOCAL SCHOOL TAXES IN THE 2025-2026 TAX YEAR.

This Act allows any school district located in New Castle County to reset its tax rates for the 2025-2026 tax year and to reissue a tax warrant using different residential and non-residential tax rates. The non-residential tax rate must be at least equal to the residential tax rate and may not be more than 2 times the residential tax rate. The total amount of revenue projected to be collected through use of the residential and non-residential tax rates may not exceed the total amount of revenue the district was projected to collect under its original tax warrant. The districts have 10 business days from the enactment of this Act to reset the rates and issue a new tax warrant to New Castle County. Upon receipt of a new tax warrant, New Castle County will supplement any tax bill already issued for taxpayers in that district and adjust tax bills with an extended deadline for payment of October 30, 2025 for tax bills that change. For any taxpayer who submits payment under the original tax bill and whose total school tax liability is adjusted downward, the difference will be credited against future tax liability unless the taxpayer submits a written request for a refund, in which case New Castle County shall issue a refund. A school district that resets its rates in accordance with this Act may request and borrow from State Division I funds in the event of a cash flow shortfall of local school funds due to the extension of the deadline for tax payments for the 2026 fiscal year.

Signed into law Aug 12, 2025 0 co-sponsors
Primary HB 240
Signed into law · Delaware House · Lead sponsor
AN ACT TO AMEND TITLE 9 AND TITLE 14 OF THE DELAWARE CODE RELATING TO SCHOOL AND COUNTY TAXES.

This Act requires a county to issue a refund to a taxpayer for property tax determined to have been overpaid for that year after an assessment appeal if the amount is $50 or greater. A county may elect to refund or credit the amount against future taxes due when the overpayment is less than $50. Amounts in school taxes determined to have been overpaid by a taxpayer after an assessment appeal will be refunded by the county following the same rule.

Signed into law Aug 12, 2025 0 co-sponsors
Primary HB 247
In committee · Delaware House · Lead sponsor
AN ACT RELATING TO THE COLLECTION OF TAXES FOR REAL PROPERTY IN THE 2025-2026 TAX YEAR.

This Act is a short-term response to the recent tax reassessment that protects homeowners, who have received substantially increased property and school tax bills for the 2025-2026 tax year, from legal action while the General Assembly and New Castle County explore long-term solutions. Many Delaware homeowners have raised several troubling questions and concerns about the property reassessment process. After the reassessment, the tax burden has drastically shifted to homeowners, which has hit vulnerable groups the hardest, including seniors, low-income families, and long-term residents. This Act requires the tax collecting authority for New Castle County (“County”) to offer payment plans to all taxpayers to pay county property and school taxes assessed to residential properties for the 2025-2026 tax year. After offering the payment plan, the County must give a taxpayer at least 30 days from the date of the offer to enter into the payment plan. If a taxpayer enters into a payment plan and makes payments in compliance with the payment plan, the County may not collect the taxes owed out of the taxpayer’s real or personal property, including by filing a civil action to collect the taxes or by seizing or selling the taxpayer’s property. Additionally, the County may not charge fees, penalties, or interest on taxes owed by taxpayers who make payments in compliance with the payment plan. This Act sunsets on December 31, 2026, unless otherwise provided by a subsequent Act of the General Assembly. But the prohibitions on collecting taxes out of the taxpayer’s real or personal property and on charging fees, penalties, or interest on taxes continue to apply to payment plans that extend on or beyond December 31, 2026, so long as the taxpayer remain in compliance with the payment plan.

In committee Aug 7, 2025 0 co-sponsors
Primary HB 249
In committee · Delaware House · Lead sponsor
AN ACT RELATING TO TAXES IN THE 2025-2026 TAX YEAR.

This Act requires counties to void all tax bills already issued to taxpayers in the county for the 2025-2026 tax year and to reissue property and school tax bills for the 2025-2026 tax year using the previously assessed value of the real property for all property subject to county taxation under Part V of Title 9 and all property subject to the local school tax under Chapter 19 of Title 14. This requirement does not apply to tax bills for new construction completed during the 2025-2026 tax year. Within 10 days of enactment of this Act, school districts must deliver a new tax collection warrant to the county calculated using the previously assessed value of the real property for school tax, so tax bills for the 2025-2026 tax year can be reissued. The deadline for payment of the reissued tax bills is extended to October 30, 2025, and counties must refund or credit overpayments of taxes for the 2025-2026 tax year to taxpayers who submit payment in accordance with previous tax bill. A school district may request and borrow from State Division I funds in the event of a cash flow shortfall of local school funds due to the extension of the deadline for tax payments for the 2026 fiscal year.

In committee Aug 7, 2025 0 co-sponsors
Primary HB 248
In committee · Delaware House · Lead sponsor
AN ACT TO AMEND TITLE 9 OF THE DELAWARE CODE RELATING TO TAX PAYMENTS.

Maddy summaryHB 248 changes Delaware's tax payment rules to allow all three counties (New Castle, Kent, and Sussex) to accept tax payments on a quarterly or monthly basis instead of only annually. This directly affects property owners and businesses paying county taxes by giving them more flexible payment options. The key mechanism is amending Title 9 of the Delaware Code to permit local tax collectors to set up these shorter payment cycles. The bill creates a concrete policy change in how county tax payments are structured, without specifying which tax types are included.

In committee Aug 7, 2025 0 co-sponsors
Primary HB 244
In committee · Delaware House · Lead sponsor
AN ACT TO AMEND TITLE 14 OF THE DELAWARE CODE RELATING TO LOCAL SCHOOL TAXES.

Section 1 of this Act requires modifications to exemptions from county taxation to reasonably reflect changes in property value and inflation. This Act also requires New Castle County to use the same eligibility criteria and calculation formula for exemption from school taxes that it used for county taxes as of June 1, 2025. Section 2 of this Act provides that upon passage of House Bill No. 242 of the 153rd General Assembly, the expanded school tax exemption will be applied during the 2025-2026 tax year in any New Castle County School district that reissues its tax warrant in accordance with House Bill No. 242.

In committee Aug 7, 2025 0 co-sponsors
Primary HB 71
Signed into law · Delaware House · Lead sponsor
AN ACT TO AMEND TITLE 14 RELATING TO INTERSCHOLASTIC ATHLETICS.

This Act requires the Delaware Interscholastic Athletic Association to promulgate regulations requiring all coaches to have CPR, first aid, and automated external defibrillator (AED) training. It also requires schools with an athletic program or department to have an Emergency Action Plan for responding to a cardiac arrest event at an athletic event or practice. It requires that an AED be accessible in a clearly marked, unlocked location at any athletic event or venue. Finally, the regulations must require testing and maintenance of AEDs and notification to the Office of Emergency Medical Services regarding the AED acquisition and its location.

Signed into law Jul 30, 2025 0 co-sponsors
Primary HB 128
Signed into law · Delaware House · Lead sponsor
AN ACT TO AMEND TITLE 19 OF THE DELAWARE CODE RELATING TO THE FAMILY AND MEDICAL LEAVE INSURANCE PROGRAM.

This substitute for House Bill No. 128, like House Bill No. 128, does the following: This Act provides that the Paid Family and Medical Leave Insurance Program is the primary payor, and other paid leave benefits must be coordinated with this benefit according to the terms of the policy or procedure governing other benefits. This Act also allows disability insurance benefits to be offset by family and medical leave benefits paid to an employee pursuant to the terms of a disability insurance policy. This Act addresses private plans, and clarifies that an employer that meets its obligations under Chapter 37 of Title 19 through a private plan does not need to provide claim documentation to the Department except if there is an appeal, complaint, audit, or specific inquiry from the Department. Private plan employers with fewer than 25 employees that voluntarily elect to provide coverage under the Chapter that is otherwise exempted due to the size of their companies will be subject to all of the provisions of the Chapter. This Act establishes a Paid Leave Advisory Committee to review issues related to the implementation and administration of the Paid Family and Medical Leave Insurance Program and to review proposed statutory and regulatory amendments to the program. This substitute differs from House Bill No. 128 as follows: This substitute does not change the calculation of an application year or change the 24-month benefit period to a 12-month benefit period. This substitute adds provisions for child support garnishment of PFMLA benefits. This substitute prohibits the practice of requiring employees to use unused accrued paid time off before accessing PFMLA benefits. This substitute allows the Paid Leave Advisory Committee to begin meeting once the Delaware LaborFirst system is functional and the steering committee has been dissolved. This substitute specifies that family and medical leave benefits cannot be assigned and are exempt from the claims of creditors. This substitute sets forth procedures for executing upon judgments for amounts due under Chapter 37 of Title 19 or other titles subject to this chapter.

Signed into law Jul 30, 2025 0 co-sponsors
Primary SB 105
Signed into law · Delaware Senate · Lead sponsor
AN ACT TO AMEND TITLE 16 OF THE DELAWARE CODE RELATING TO THE ENHANCED 911 EMERGENCY REPORTING SYSTEM SERVICE BOARD.

This Act provides that the Secretary of the Department of Safety and Homeland Security (“Secretary”), or the Secretary’s designee, is a member of the Enhanced 911 Emergency Reporting System Service Board (“Board”) by virtue of the Secretary’s position. This Act also makes the Secretary, or the Secretary’s designee, the Board Chair. The Secretary is currently, and historically, an appointed member of the Board and this Act would codify that practice. This Act also makes technical corrections to conform existing law to the standards of the Delaware Legislative Drafting Manual.

Signed into law Jul 30, 2025 0 co-sponsors
Primary HB 139
Signed into law · Delaware House · Lead sponsor
AN ACT TO AMEND TITLE 18 OF THE DELAWARE CODE RELATING TO LINE-OF-DUTY HEARINGS.

This substitute to House Bill No. 139 grants the Insurance Coverage Office, which is tasked by statute with adjusting all claims and paying losses covered by the Fund, standing to participate in line of duty death claims. Like House Bill No. 139, this substitute also eliminates a requirement for the Insurance Commissioner to hold a hearing for every Line-of-Duty Death claim, and instead mandates they occur only if the claim is contested, and makes technical corrections to conform existing law to the standards of the Delaware Drafting Manual.

Signed into law Jul 30, 2025 0 co-sponsors
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