Temporary tax relief, not a deferral — and not a permanent break
RSA 79-E doesn't eliminate property taxes, and it doesn't delay them to be repaid later. It's a temporary abatement on the improvement portion of a property's assessed value — for a set number of years, you keep paying taxes on the pre-renovation value, and the improvements aren't taxed (or are partially taxed). When relief ends, the property rolls onto the rolls at its full improved value, permanently. The foregone tax during the relief period is never recovered.
The core bargain: A property owner rehabilitates an underused or deteriorating building. In exchange, the city holds the assessed value steady during the relief period — taxing the pre-renovation value, not the improved value. After the period ends, full taxes resume on the improved property. In return, the owner agrees to a covenant ensuring a defined public benefit.
Four things to understand before debating adoption
The mechanics drive everything that follows — eligibility rules, covenant design, the "but-for" review, and what Portsmouth actually gains or gives up. Four cards. Read all four.
The pre-project assessed value stays on the rolls and keeps generating tax at the normal rate. Only the value added by the qualifying improvements is abated — at a percentage the city sets (often 100%), for a duration the city sets within the statutory cap.
At the end of the relief period, the property rolls onto the tax base at its full post-project assessed value. From that point forward the city captures the full tax increment — for as long as the property stands. Nothing is repaid or deferred.
Every grant of relief is paired with a covenant (RSA 79-E:8) committing the project to one or more statutory public benefits. The covenant is recorded with the registry of deeds and can be required to run up to twice the relief period — a 15-year grant can carry a 30-year covenant.
The statute directs the governing body to grant relief only where the public benefit would not occur otherwise. This is the hardest part to administer well and where most 79-E programs succeed or fail. A weak but-for review turns the tool into a windfall; a rigid one turns away projects the city actually wants.
Which program could apply?
Click any card to see details. Bonus years under Traditional 79-E stack, up to the 15-year maximum. Relief begins upon completion of the rehabilitation, not at approval.
Community Revitalization
Rehabilitation of underutilized structures in downtown and village center zones. The foundational program, in use since 2006.
stackable bonuses
Residential Property Revitalization
Homeowners improving aging housing stock — including ADU creation. Works citywide, not just downtown.
same as traditional
Office Conversion Zones HB 1103
Office buildings converted to residential in a city-designated zone. HB 1103 (awaiting signature) renames these Residential Conversion Zones and extends them to commercial and industrial buildings.
same framework
Housing Opportunity Zones HB 1103
New construction or improvement in designated areas. Current law mandates an affordability mix and caps relief at 10 years; HB 1103 (awaiting signature) would let municipalities set their own criteria, with up to 15 years for workforce housing.
HB 1103: 7 or 15
Coastal Resilience Incentive Zone
For coastal municipalities — Portsmouth-specific. Tax relief tied to flood resilience improvements: elevation, drainage, and natural feature restoration.
same framework
Program comparison at a glance
| Feature | Traditional 79-E | RPR Zone | Office Conv. Zone | Housing Opp. Zone | CRIZ |
|---|---|---|---|---|---|
| Location restriction | Downtown / village center only | Anywhere in city | Designated zone | Designated zone | Coastal area (city-designated) |
| Property type | Any underutilized structure | Residential 1–4 units | Office, business, nonprofit, co-working → residential conversion. HB 1103: adds commercial & industrial (RSA 72:80) | Any residential | Any structure in resilience zone |
| Building age minimum | None specified | 40+ years old | None specified | None specified | None specified |
| New construction | Replacement only (w/ historical review) | No | No | Yes | No |
| ADUs qualify | Possibly | Yes — explicitly | No | Possibly | No |
| Affordability req. | Not defined in law | Not required | Not required | Current law: ≥⅓ units ≤80% AMI. HB 1103: municipality sets criteria | N/A — resilience focus |
| Rehab cost minimum | ≥15% assessed value or ≥$75,000 | ≥15% assessed value or ≥$75,000 | Not specified separately | Not specified | Municipality defines |
| Max relief period | Up to 15 years (stacked) | Up to 15 years | Up to 15 years | Current law: 10 yrs. HB 1103: 7 yrs, or 15 yrs with workforce housing | Up to 15 years |
| Relief begins | On completion of rehab | On completion of rehab | On completion of conversion | At CO. HB 1103: CO or completion of new units | On completion of measures |
| Covenant duration | Coextensive with relief period — governing body may require up to 2× the relief period (RSA 79-E:8) | ||||
| Frequency limit | Not specified | Once per 20 years per property | Once per 20 years per property | Not specified | Not specified |
| Grant exclusion | Does not apply if >50% of construction costs funded by non-repayable state/federal grants (RSA 79-E:14) | ||||
| NH adoption rate | ~68 municipalities (2024 survey) | 3 (Keene, Newport, Derry) | Very limited | 1 (Conway, 2024) | Not widely adopted |
| Scheduled repeal | None | None | January 1, 2035 (not altered by HB 1103) | None | None |
"HB 1103" entries reflect the version adopted by both chambers May 21, 2026; the bill awaits the governor's signature and is not yet law.
What 79-E doesn't do
- It does not control rents after the relief period ends — post-renovation rents are market-rate unless a separate covenant specifies otherwise.
- It does not make projects financially viable on its own — high land costs and construction costs in Portsmouth mean the tax relief is one input among many.
- It does not guarantee affordability in the long run. The statute does not define "affordable" — municipalities must specify this in their adopting ordinance or it is effectively undefined.
- It does not apply if more than 50% of construction costs come from non-repayable state or federal grants (RSA 79-E:14).
- Relief begins at completion, not at groundbreaking. Projects do not receive tax relief during the construction period itself.
- It requires staff capacity to administer: applications, financial need ("but for") assessment, covenant drafting and recording, and ongoing compliance monitoring for the full covenant term.
- Adaptive reuse is often more expensive than new construction — the incentive reduces but does not eliminate the cost premium.
- The covenant can be required to run up to twice the relief period — a 15-year relief period could mean a 30-year covenant. Developers should model this into long-range assumptions.
Tax relief is not a use permit
RSA 79-E abates the tax on improvements. It grants no right to build them. Every project these programs might reward must independently comply with Portsmouth's zoning ordinance — and where zoning does not allow the underlying use, the incentive is worth nothing.
An RPR Zone can reward adding an ADU or converting to a 2–4 unit building — but only where the zoning ordinance allows that ADU or conversion on the lot in question. The abatement follows the permit; it never substitutes for one.
Designating a conversion zone makes commercial-to-residential projects eligible for tax relief within it. The underlying district still governs whether residential use, density, parking, and dimensions permit the conversion at all.
Adopting these programs where zoning prohibits the target projects produces applications that cannot be approved; expanding zoning capacity without addressing feasibility produces permissions that go unused. The two move together or barely move at all.
Key terms
Terms that recur in 79-E adoption debates, covenant drafting, and public hearings. Reference rather than read top-to-bottom.
- Abatement vs. deferral
- An abatement reduces tax owed during a period. A deferral delays tax that must eventually be paid. 79-E is an abatement — the foregone tax is never recovered.
- Assessed value
- The value a municipality places on a property for tax purposes. 79-E freezes the pre-project assessed value for tax calculations during the relief period; improvement value is partially or fully excluded.
- AMI (Area Median Income)
- HUD-published income threshold for a metro area, adjusted by household size. 80% AMI is the workforce-housing benchmark in current HOZ law; 60% AMI typically defines affordable housing.
- But-for test
- The statutory requirement that tax relief be granted only where the public benefit would not otherwise occur. Essentially: would the project happen without the incentive?
- Certificate of Occupancy (CO)
- Municipal sign-off that a completed building is fit for occupancy. In HOZ, the relief period begins at CO issuance — or, under HB 1103, at CO or completion of construction of new housing units.
- Covenant
- A recorded legal agreement (RSA 79-E:8) between the property owner and the city committing the project to specific public benefits in exchange for tax relief. Runs with the land. Can be required to last up to 2× the relief period.
- Fair Market Rent (FMR)
- HUD-published rent benchmark by unit size and area. Used in some 79-E covenants as an alternative to AMI for rent restrictions.
- Public benefit categories (RSA 79-E:7)
- Statutory options a 79-E project must advance: economic vitality; cultural/historic significance; preservation of existing building stock; municipal center development; housing in urban or town centers.
- Qualifying structure
- Under traditional 79-E, a structure in a designated district that is underutilized or in disrepair. Definitions vary by program — RPR requires 40+ years old and ≤4 units; conversion zones require office (or, under HB 1103, commercial/industrial) use being converted to residential.
- Substantial rehabilitation
- Rehabilitation costs equal to or greater than 15% of the pre-rehab assessed value, or $75,000, whichever is less (RSA 79-E:2, IV). The statutory threshold for eligibility.
- Tax relief period
- The finite number of years during which abatement applies, set by the governing body within statutory caps (RSA 79-E:5). Relief begins upon completion of rehabilitation — or, for HOZ, upon issuance of Certificate of Occupancy.
- Workforce housing (RSA 674:58)
- The statutory definition HB 1103 uses to set the HOZ relief ceiling: up to 15 years if workforce housing is created, up to 7 if not. Distinct from the locally defined affordability criteria a municipality may adopt for its zone.
- Enabling legislation
- State law that grants municipalities the option to adopt a program. RSA 79-E is enabling — it does nothing automatically. Portsmouth must affirmatively adopt a program by vote of the City Council.
Could RSA 79-E help your property?
If you own an older home in Portsmouth and are considering renovating, converting space to an ADU, or adding units, the Residential Property Revitalization (RPR) program is the most relevant option — but it requires the city to designate RPR zones first.
Eligibility Explorer
Answer a few questions to see which programs could apply to your situation. Results are illustrative — consult a professional for specific advice.
A Portsmouth scenario
Suppose you own a 1920s duplex assessed at $650,000. You spend $180,000 to add a legal ADU and renovate both units. Without 79-E, your assessed value might jump to $900,000 immediately upon completion. With an RPR zone and a 7-year relief period, the clock starts when construction finishes — and for those 7 years you continue paying taxes on $650,000. Then full taxes resume on the improved value.
Things to keep in mind
- Portsmouth has not yet adopted any 79-E program. These are potential scenarios, not current policy.
- Tax savings estimates are illustrative. Your actual tax rate, assessed value, and relief years may differ significantly.
- The RPR Zone requires the city to designate specific areas — your neighborhood may or may not be included.
- The relief applies to the increase in assessed value only. You continue paying taxes on the pre-renovation assessed value throughout the relief period.
- Zoning comes first: an ADU or unit conversion must be permitted on your lot under the zoning ordinance before any tax relief is relevant.
What it's looked like elsewhere in NH
Single-family to 5 units
Owner converted a historic dwelling to 5 units and added 3 more via a 1,319 sq ft addition. 7 years of relief.
86 Main Street
Rehabilitation of a historic building downtown, returned to productive residential and commercial use.
How the math changes with 79-E
For commercial and multi-unit developers, 79-E temporarily abates the property tax on improved value — improving the early-year cash flow on projects where adaptive reuse makes margins tight. The programs differ in what types of projects qualify and how years stack.
Program Finder
Describe your project to see which programs could apply.
Build your relief period
Under Traditional 79-E, relief periods stack. Select all that apply to your project:
Select bonuses above to see total years.
NH projects that have used 79-E
Strafford County Courthouse
59 apartments in a historic courthouse. 12 units at ≤80% FMR for 21 years. City forewent $315K in taxes; developer forewent $2.5M in rental revenue over 21 years.
Factory on Willow
90,000 sq ft mill converted to 60 studio apartments, event space, distillery, artist residency program.
Scenic Theater / Sallinger Block
Two historic city-owned buildings restored and connected. 50 units plus commercial space. Downtown revitalization anchor.
Developer considerations
- The "but for" test: municipalities are expected to assess whether the tax relief is genuinely necessary for the project to proceed. Applicants should be prepared to demonstrate financial need with pro forma documentation.
- The affordability bonus (+4 years) does not require new affordable units — rehabilitation of existing below-market units may qualify. The statute uses "a project that includes affordable housing." Municipalities define what "affordable" means in their adopting ordinance.
- The covenant can be required to run up to twice the relief period (RSA 79-E:8). A maximum 15-year relief period could mean a 30-year covenant obligation. Model this into long-range assumptions and legal review.
- Projects receiving more than 50% of construction costs from non-repayable state or federal grants do not qualify for 79-E relief (RSA 79-E:14). Verify grant sources before applying.
- Relief begins at completion of rehabilitation — not at approval or during construction. Projects do not receive tax relief during the construction period itself.
- Adaptive reuse in Portsmouth's constrained market typically costs more than new construction. Verify that the tax relief materially improves your pro forma before relying on it as a deal-maker.
- HB 1103 (awaiting governor's signature) would make Housing Opportunity Zones the strongest new-construction path: up to 15 years of relief where workforce housing (RSA 674:58) is created, with affordability criteria set locally rather than by the ⅓-at-80%-AMI statutory mandate.
Where the program helps — and where it doesn't
RSA 79-E was built around tax-paying property owners: its entire value is relief from property tax on improvement value. For nonprofit and mission-driven developers of permanently affordable housing, that makes it a situational tool — genuinely useful in some capital structures and nearly irrelevant in others. The honest map is below.
Where a mission developer pays full property taxes — mixed-income buildings, workforce rentals without a PILOT, NOAH acquisition-rehab — abating the tax on improvement value directly improves early operating budgets, when debt service pressure is highest.
If signed, HB 1103 allows up to 15 years of relief where workforce housing (RSA 674:58) is created — the longest new-construction relief in the statute — with affordability criteria set by the municipality rather than the current ⅓-at-80%-AMI mandate. A Portsmouth HOZ ordinance could be written around the income tiers mission developers actually serve.
No relief is available where more than 50% of construction costs come from non-repayable state or federal grants. Deeply affordable projects often carry the most grant-dependent stacks in housing. Tax-credit equity is not structured as a grant, but layered capital grants can cross the threshold — eligibility must be verified against the actual sources-and-uses with counsel before 79-E is assumed in a pro forma.
Affordable projects are often structured with payment-in-lieu-of-taxes agreements that already reduce the property tax burden. A 79-E abatement and a PILOT address the same line item; which instrument applies, and whether they can coexist for a given project, is a structuring question to resolve before applying.
The permanence mismatch: 79-E relief is temporary by design, and the foregone tax is never recovered — but the relief ends. Permanent affordability comes from deed restrictions, regulatory agreements, and financing covenants, not from a tax abatement. The 79-E:8 covenant can be required to run up to twice the relief period, which is a meaningful affordability term, but it is not a perpetuity instrument. For permanently affordable projects, 79-E is at most a financing assist layered under the documents that actually secure permanence.
Before assuming 79-E in an affordable pro forma
- Confirm the project will owe property tax on improvement value at all — exempt or PILOT-structured projects may gain little or nothing from an abatement.
- Run the RSA 79-E:14 test against the full sources-and-uses: more than 50% of construction costs from non-repayable state or federal grants means no relief.
- Portsmouth has adopted none of these programs yet, and any HOZ criteria would be set in the city's adopting ordinance — the terms that matter most to mission developers do not exist until the Council writes them.
- HB 1103 awaits the governor's signature; the 15-year workforce ceiling and locally set criteria are not law until it is signed, and take effect 60 days after passage.