Iowa Property Tax Calculator

How this calculator works

Iowa property tax is governed primarily by Iowa Code § 441.21 (assessment and the statewide rollback), the credit chapters at § 425 (Homestead and senior), and § 426A (Military Service Property Tax Credit). Two structural features make Iowa unlike every other state in the U.S.: the statewide assessment-limitation order (the "rollback") and the 2023 HF 718 Homestead expansion to a $142,000 actual-value exemption.

The canonical Iowa math:

• start with the county assessor's actual (pre-rollback) value
• subtract the § 425.1 Homestead Tax Credit ($142,000 actual value, owner-occupied residential only)
• multiply by the § 441.21 statewide rollback percentage for the property's classification
• subtract the § 425.15 senior addl exemption ($6,500 of taxable value if owner is 65 or older)
• subtract the § 426A Military Service Property Tax Credit ($1,852 to $11,118 by service category)
• multiply by the county consolidated levy (county + city + school + special districts)

The order matters: Homestead subtracts BEFORE rollback (so the saving is multiplied by the rollback percentage); senior and military subtract AFTER rollback (so the saving is the full dollar amount).

The statewide rollback — Iowa Code § 441.21

The rollback is the single most distinctive feature of Iowa property tax. Each year, the Iowa Department of Revenue measures the year-over-year growth in statewide assessed value for each property classification. When residential or agricultural assessed values rise faster than 3% statewide, the Department issues an order computing a rollback percentage that is applied uniformly to every parcel of that classification in the state to bring taxable value back to the 3% growth ceiling.

The 2025-26 percentages:

| Classification | Rollback | Mechanism | | --- | --- | --- | | Residential | ~46.3% | Statewide 3% growth cap | | Agricultural | ~75% | Productivity-based formula | | Commercial | 89.0412% | Fixed by HF 295 (2013) | | Industrial | 89.0412% | Fixed by HF 295 (2013) |

A $300,000 residential home has roughly $138,900 of taxable value before any Homestead credit ($300,000 times 0.463). A $500,000 farm has roughly $375,000 of taxable value ($500,000 times 0.75). A $1 million commercial building has roughly $890,412 of taxable value ($1,000,000 times 0.890412).

No other state has this mechanism. California's Proposition 13 freezes the assessed value itself at the prior year for an existing owner — a per-parcel cap. Florida's Save Our Homes caps the annual increase per parcel at 3%. Iowa's rollback is population-level: a single statewide percentage is computed by the Department of Revenue and applied uniformly across all parcels of the same classification. A homeowner whose individual property appreciated 10% in a year where statewide residential rose 8% still gets the rollback computed from the statewide figure — the per-parcel appreciation is irrelevant to the rollback calculation.

The rollback changes each year. In flat or declining markets it rises back toward 100% (less rollback applied because growth is at or below the 3% cap). In fast-appreciating markets it falls (more rollback applied). The residential rollback was near 56% a decade ago, near 54% five years ago, and is near 46% for 2025-26 — reflecting sustained mid-cycle appreciation in the Iowa housing market.

The HF 718 Homestead Tax Credit — § 425.1 as amended 2023

For decades the Iowa Homestead Tax Credit under § 425.1 exempted the first $4,850 of taxable value for owner-occupied residential property — a credit worth roughly $150 to $200 a year that had not been meaningfully updated since the 1970s. House File 718 (2023) restructured the credit into an "actual-value" exemption of $142,000 off the pre-rollback assessed value.

The new structure is dramatically more generous. A $300,000 owner-occupied home subtracts $142,000 BEFORE the rollback — so the rollback runs on $158,000 instead of $300,000, producing taxable value of roughly $73,154 instead of $138,900. The effective savings:

• old credit: $4,850 of taxable value times typical Polk levy 0.03865 ≈ $187 of annual tax savings
• new credit: $65,746 of taxable value reduction (142,000 times 0.463) times typical Polk levy 0.03865 ≈ $2,541 of annual tax savings

HF 718 was one of the largest single-year property-tax reductions in Iowa's history. The change applies to owner-occupied residential only — rental property, second homes, agricultural land, and commercial property do not qualify.

The senior addl exemption — § 425.15 (HF 718, 2023)

HF 718 also enacted § 425.15, an additional $6,500 of TAXABLE (post-rollback) value exempted for owner-occupied residential property where the owner is 65 or older on July 1 of the tax year. The senior add stacks on top of the standard $142,000 actual-value Homestead Tax Credit.

The senior add is independent of income — there is no income test, unlike many other states' senior property-tax benefits. Apply once on Form 54-028 with the county assessor; the exemption renews automatically until ownership or occupancy changes.

The combined Homestead + senior add removes roughly $148,500 of value (after the rollback math) from the tax base for an over-65 owner-occupant. On a $300,000 home in Polk County at the 0.03865 levy, the senior add saves an additional $251 a year on top of the standard Homestead — a meaningful reduction for retirees on fixed incomes.

The Military Service Property Tax Credit — § 426A

Iowa Code § 426A provides a credit (technically a taxable-value exemption) for veterans of qualifying service periods. The amount ranges from $1,852 for the most common service category up to $11,118 for veterans whose service falls within specific eligibility windows defined by statute.

This calculator uses representative tiers:

| Tier | Taxable-value exemption | Notes | | --- | --- | --- | | Standard | $1,852 | Most common service categories | | Extended | $4,000 | Specific eligibility windows | | Expanded | $6,500 | Specific eligibility windows | | Maximum | $11,118 | Specific eligibility windows |

The binding amount depends on the veteran's certified DD-214 service period and is determined by the county assessor on a one-time application (Form 54-146) accompanied by a certified DD-214. Once approved the credit continues automatically.

Unlike the Homestead and senior credits, the Military Service Credit is not limited to owner-occupied residential — a qualifying veteran's farm, rental property, or business may receive the credit, though in practice most claims are filed on a homestead.

A worked example — $300,000 Des Moines home, owner age 40

A $300,000 home in Des Moines (Polk County). Owner is 40, owner-occupied, not a veteran. Polk's typical consolidated levy is 38.65 mills (0.03865).

• Assessed value: $300,000
• § 425.1 Homestead Tax Credit: $300,000 minus $142,000 = $158,000 actual after Homestead
• § 441.21 rollback: $158,000 times 0.463 = $73,154 taxable before credits
• § 425.15 senior addl: not applicable (age 40)
• § 426A military: not applicable
• Final taxable value: $73,154
• Tax owed: $73,154 times 0.03865 = $2,827
• Effective rate: $2,827 / $300,000 = 0.94%

The Homestead Tax Credit alone moves this owner from a $5,368 bill (rental scenario, no Homestead) to a $2,827 bill — almost exactly halving the tax. That's the HF 718 effect.

A worked example — same home, owner age 70

Same $300,000 Des Moines home, owner is now 70. Same Polk levy 0.03865.

• Assessed value: $300,000
• § 425.1 Homestead: $142,000 → $158,000 actual after
• § 441.21 rollback: $158,000 times 0.463 = $73,154 taxable before credits
• § 425.15 senior addl: $73,154 minus $6,500 = $66,654 final taxable
• Tax owed: $66,654 times 0.03865 = $2,576
• Annual savings vs the under-65 baseline: $2,827 minus $2,576 = $251

The senior add saves $251 a year — modest but cumulative ($2,510 across a decade in the home), and notably there is no income test that would phase it out as Social Security and pension income come in.

A worked example — Iowa City vs Des Moines

Same $300,000 owner-occupied home, owner age 40. Iowa City (Johnson County) consolidated levy is 39.20 mills (0.03920) vs Polk's 38.65 mills.

| Metric | Polk (Des Moines) | Johnson (Iowa City) | | --- | --- | --- | | Assessed value | $300,000 | $300,000 | | Homestead actual exemption | $142,000 | $142,000 | | Actual after Homestead | $158,000 | $158,000 | | Rollback | 46.30% | 46.30% | | Taxable | $73,154 | $73,154 | | Consolidated levy | 38.65 mills | 39.20 mills | | Tax owed | $2,827 | $2,868 |

The rollback math is identical statewide — that's the population-level cap doing its work. The bill differs only by the consolidated levy. Iowa City's modestly higher levy reflects university-driven population and slightly elevated school funding; the $41 annual difference on a $300K home is small in absolute terms but compounds across decades of ownership.

Linn County (Cedar Rapids) runs cheaper at 36.10 mills (about $2,641 on the same home). Black Hawk County (Waterloo) is the most expensive of the five major counties at 41.30 mills (about $3,021). Scott County (Davenport) is in between at 37.50 mills (about $2,743).

A worked example — $500,000 farm, agricultural rollback

A $500,000 working farm in Polk County. Owner is 50, not a veteran, not owner-occupied (the farmhouse may be — but the agricultural acreage is classified separately as ag).

• Assessed value (ag classification): $500,000
• § 425.1 Homestead: not applicable (agricultural, not residential)
• § 441.21 rollback (agricultural): $500,000 times 0.75 = $375,000 taxable
• § 425.15 senior addl: not applicable
• § 426A military: not applicable
• Tax owed: $375,000 times 0.03865 = $14,494

The agricultural rollback at ~75% is far more conservative than the residential ~46.3% — a deliberate choice by the Legislature reflecting the productivity-based formula at § 441.21(1)(e), which considers crop yields, prices, and production costs in computing the agricultural taxable-value ceiling. Iowa farmers nonetheless argue that the 75% rollback understates the burden of ad valorem taxation on farmland during low-commodity-price years.

A worked example — $1 million Des Moines commercial property

A $1 million commercial building in Des Moines (Polk County) under HF 295 (2013).

• Assessed value (commercial): $1,000,000
• § 425.1 Homestead: not applicable
• § 441.21 rollback (commercial): $1,000,000 times 0.890412 = $890,412 taxable
• Tax owed: $890,412 times 0.03865 = $34,414
• Effective rate: 3.44%

The commercial rollback was fixed at 89.0412% by HF 295 (2013) — a structural reform that brought commercial closer to residential treatment by introducing a permanent rollback to commercial property for the first time. Before HF 295, commercial was assessed at 100% of actual value, producing effective rates over 3.8% on the same Polk levy. The reform was paired with a state "backfill" payment to local governments to offset the lost revenue; the backfill was phased down through the 2010s and largely eliminated by HF 718 (2023), shifting the structural cost of the commercial rollback fully onto county / city / school budgets.

The full HF 295 math is actually a two-tier rollback — the first $150,000 of commercial value is rolled back to the residential rollback percentage (currently ~46.3%), and the remainder is rolled back to 89.0412%. This calculator uses the simpler single-tier 89.0412% approximation as a planning estimate; the two-tier effect is meaningful on smaller commercial parcels (under ~$500K assessed) but is a rounding issue on larger commercial properties.

Comparing Iowa to surrounding states

Effective property-tax rates on residential primary residences across the Midwest:

| State | Effective rate (typical owner-occupied) | Structural feature | | --- | --- | --- | | Missouri | ~0.95% | 19% residential assessment ratio | | Iowa (post-HF-718) | ~0.90%–1.05% | Statewide rollback + $142K Homestead | | Minnesota | ~1.05% | State-funded homestead credit | | South Dakota | ~1.15% | No income tax; higher property reliance | | Nebraska | ~1.55% | No rollback; high local levies | | Wisconsin | ~1.55% | No rollback; full-value assessment | | Illinois | ~2.05%–2.30% | Cook County multiplier; very high levies |

Iowa's post-HF-718 effective rates are comparable to Minnesota and Missouri, well below Illinois and Nebraska, and well below Wisconsin. The rollback plus $142,000 Homestead combination produces the most progressive property-tax structure in the Midwest for owner-occupied housing. For rental property and second homes (no Homestead), Iowa effective rates roughly double — a $300K rental in Polk County runs about 1.79% effective, comparable to Nebraska or Wisconsin.

Common errors to avoid

• Reading the tax bill as if it shows actual value. Iowa tax bills show TAXABLE value (post-rollback). The actual value is on the assessment notice. A homeowner who multiplies the tax-bill "value" by 0.463 again is double-counting the rollback. Conversely, a homeowner who computes the bill from the assessment notice's actual value and forgets to apply the rollback overstates the bill by more than double.
• Treating the pre-HF-718 $4,850 Homestead as still in effect. The pre-2023 statute exempted $4,850 of TAXABLE value. The post-HF-718 statute exempts $142,000 of ACTUAL (pre-rollback) value. A homeowner using the old figure understates the credit by an order of magnitude.
• Applying Homestead to a rental, second home, or LLC-owned property. § 425.1 requires owner-occupancy. Rental property, second homes, and property held in an LLC (even by the same individual) do not qualify. The county assessor cross-references occupancy via mailing address, drivers' license, and voter registration.
• Forgetting the July 1 age test for the senior add. § 425.15 requires age 65 on July 1 of the tax year. An owner turning 65 on July 15 misses that year's senior add and qualifies starting the following year.
• Confusing the credit categories. The Military Service Credit (§ 426A) is the standard veterans' benefit. There are also separate Disabled Veterans Homestead Tax Credit programs (federal disability rating-driven, not modeled here) and a Property Tax Credit for low-income elderly and disabled (§ 425.16-425.40, income-tested, also not modeled here). Confirm which credit fits the owner's situation with the county assessor.
• Missing the July 1 application deadline. All three credits (Homestead 54-019, Senior 54-028, Military 54-146) must be filed by July 1 of the tax year with the county assessor. Late applications are not statutorily prohibited but require county discretion.

Tools, not advice. Confirm the binding rollback percentage for the assessment year, the actual consolidated levy, and credit eligibility with the county assessor before relying on any result for planning purposes.

Last reviewed: 2026-05-16.