The Dennis, MA property tax rate is $4.29 per $1,000 of assessed value for fiscal year 2026, which runs from July 1, 2025 through June 30, 2026.1Town of Dennis. Assessing Dennis uses a single rate, so residential, commercial, industrial, and personal property all pay the same amount per dollar of value. A home assessed at $600,000 owes $2,574 in base tax before surcharges.
How the Bill Is Calculated
The math is simple. Divide your assessed value by 1,000, then multiply by 4.29. A $500,000 home produces $2,145 in base tax. A $750,000 home owes $3,217.50. Surcharges (covered below) are then applied as a percentage of that base amount on certain quarterly bills.
Because every $1,000 of assessed value adds $4.29 to the annual bill, assessment accuracy matters. A $50,000 overvaluation costs about $215 a year. If the number on your notice looks high, the abatement process is your remedy.
Massachusetts law requires all property to be assessed at full and fair cash value, meaning the price a willing buyer would pay a willing seller.2General Court of Massachusetts. Massachusetts Code Chapter 59 Section 38 – Fair Cash Valuation; Classification of Assessed Valuation; Taxable Valuation The Board of Assessors updates values annually using verified sales from the prior calendar year along with the physical characteristics of each parcel.
Surcharges That Raise the Bill
Two surcharges push the actual amount owed above the base rate. The Water Infrastructure Investment Fund (WIIF) surcharge rose to 3% for FY2026 after voter approval at the May 2025 annual town election. WIIF is added to the third and fourth quarterly bills issued in January.3Town of Dennis. Assessing – Real Estate FAQ
The Community Preservation Act (CPA) surcharge, adopted by Dennis in 2005, adds a separate percentage to fund open space, historic preservation, affordable housing, and recreation. Both surcharges are calculated on your tax amount, not your assessed value, so they scale with whatever base tax you owe.
Payment Schedule and Late Penalties
Dennis issues bills twice a year, each covering two quarterly payments. The preliminary bill mails July 1 (based on the prior year’s tax) and covers Q1 and Q2. The actual bill, reflecting the new rate and assessment, mails January 1 and covers Q3 and Q4.1Town of Dennis. Assessing
- First quarter due August 1
- Second quarter due November 1
- Third quarter due February 1
- Fourth quarter due May 1
Miss a due date and interest accrues at 14% per year from the original due date, a rate set by state law that the town cannot waive.4General Court of Massachusetts. Massachusetts General Laws Chapter 59 Section 57 Autopay or a calendar reminder pays for itself.
Exemptions That Lower the Bill
Dennis offers several exemptions for qualifying owners. Applications for FY2026 must reach the Board of Assessors before April 1, 2026, and you have to reapply every year.5Town of Dennis. Property Tax Exemptions
Seniors
The Clause 41C exemption knocks $1,000 off the bill for owner-occupants age 65 or older as of July 1. You need ten years of Massachusetts residency and five years of property ownership in the state. FY2026 income limits are $30,510.87 single and $51,481.89 married. Assets excluding your home cannot exceed $47,699 single or $65,586 married.
The Clause 17 exemption offers a smaller $217.68 benefit (plus cost-of-living adjustments) to residents age 70 and older, surviving spouses, and surviving minor children. The asset cap is $20,000 excluding the home, with no income limit, and you need five years of ownership and occupancy.
Veterans
Disabled veterans with a service-connected disability of at least 10%, or who received the Purple Heart, qualify for exemptions ranging from $750 to a full exemption depending on severity. The property must be the veteran’s primary home as of July 1. FY2026 amounts:
- Clause 22: $800
- Clause 22A: $750
- Clause 22B: $1,250
- Clause 22E: $2,000
- Clauses 22D and 22F: full exemption
Spouses and parents of qualifying veterans may also be eligible. Full exemption under 22D and 22F generally applies to the most severe disabilities, including total blindness, loss of limbs, or a 100% rating.
Senior Tax Deferral
Clause 41A lets qualifying seniors postpone payment rather than reduce it. Owners 65 or older as of July 1, with prior-year gross income at or below $40,000, can defer taxes at 8% annual interest. The total deferred (including interest) cannot exceed 50% of the property’s assessed value, and the balance becomes a lien repaid when the property is sold, transferred, or settled from the estate. CPA taxes cannot be deferred. The program suits owners who are house-rich and cash-poor and expect enough equity to cover the accumulating balance.
Challenging Your Assessment
If you think your property is overvalued, file an abatement application with the Board of Assessors. The deadline is the due date of the first actual tax bill for the fiscal year, which for FY2026 is February 1, 2026.6General Court of Massachusetts. Massachusetts General Laws Chapter 59 Section 59 The assessors cannot extend or waive that date.
A strong application includes recent comparable sales supporting a lower value, photographs of condition issues the assessment does not reflect, or documentation of errors on the property record card (wrong square footage, phantom bathrooms, and the like). The assessors have three months from the filing date to act. If they deny the application or fail to respond, you can appeal to the state Appellate Tax Board.
A Residential Exemption May Be Coming
Massachusetts law lets towns adopt a residential exemption that reduces the taxable value of owner-occupied primary homes by up to 35% of the average assessed value of all residential property in town.7General Court of Massachusetts. Massachusetts General Laws Chapter 59 Section 5C As of late 2025, the Dennis Select Board has held public sessions on whether to adopt it but has not decided. A non-binding vote showed support for continuing the discussion.
If adopted, year-round homeowners would see lower bills while seasonal and investment owners would pick up more of the total burden. Only owner-occupied primary residences would qualify, meaning the Dennis property would have to be the owner’s principal residence for income tax purposes. Renters would not benefit directly.
Personal Property Is Taxed Too
The $4.29 rate applies to tangible personal property as well. Business equipment, furniture, and inventory in Dennis are taxable, and so are the furnishings inside a second home.8General Court of Massachusetts. Massachusetts General Laws Chapter 59 – Assessment of Local Taxes Owners of taxable personal property must file a Form of List (State Tax Form 2) with the assessors by March 1 each year. Failing to file, or underreporting, invites the assessors to estimate the value themselves, and those estimates rarely favor the taxpayer.
Federal SALT Deduction
Property taxes paid to Dennis are deductible on your federal return if you itemize, subject to the state and local tax cap. For tax year 2026, the SALT cap is $40,400 for most filers and $20,200 for married filing separately.9Office of the Law Revision Counsel. 26 USC 164 – Taxes That cap covers state income tax, local property tax, and other deductible state and local taxes combined. Property tax alone will not hit the ceiling for most Dennis homeowners, but higher-income filers combining it with Massachusetts income tax may.