IFTA Tax Rates in Iowa (2026)

Key numbers at a glance

Iowa is I-80 country. Des Moines to Davenport to Council Bluffs, thousands of carriers cross the state every day, and every one of them owes Iowa tax on the gallons burned there. Under the International Fuel Tax Agreement you report those gallons on a single quarterly return to your base state, and Iowa's rate gets applied to your Iowa miles. The Iowa Department of Revenue publishes the rate schedule each year and adjusts it under the variable-rate formula in Iowa Code chapter 452A — diesel and gasoline rates have historically moved together, though in 2026 neither budged.

The one 2026 change that touches Iowa fuel buyers was narrow: on July 1, 2026, the rate for ethanol blends classified as E-15 or higher rose from $0.265 to $0.280 per gallon, while every other Iowa rate stayed put, per the Iowa Department of Revenue's fuel tax rates page. Because that increase exceeded half a cent, Iowa even required an inventory return from fuel retailers on July 1 — a reminder of how mechanical this state's fuel tax machinery is. For the national comparison, start at the IFTA rates by state hub.

IFTA tax rates in Iowa

Per the Iowa Department of Revenue, current rates as of July 1, 2026. Rates as of Q4 2026 — confirm the current official IFTA matrix before filing.

Notice the pattern: Iowa taxes diesel 2.5 cents above gasoline but gives ethanol blends a 2-cent discount against straight gasoline. For a diesel fleet none of the alternative-fuel lines matter day to day — the 32.5-cent figure is the one that lands on your IFTA return. The Tax Foundation's July 2026 table puts Iowa gasoline tax at exactly 30.0 cents, 27th among the states, which is about as middle-of-the-road as American fuel taxes get.

Fueling strategy: Iowa versus its neighbors

Iowa borders six states, and five of them cluster within five cents of Iowa on diesel. The outlier is Illinois. Rates below are from the current IFTA matrix (as of Q4 2026 — confirm the current official IFTA matrix).

With neighbors this tight, chasing pennies across the Missouri or Minnesota border usually loses to out-of-route miles — our deadhead miles guide shows how fast a 20-mile detour eats a 3-cent saving. The one rule that always pays in Iowa is eastbound discipline: fill before crossing the Mississippi into Illinois, where the diesel rate is 41.3 cents a gallon higher. A truck entering Illinois with 120 Iowa-bought gallons has prepaid roughly $50 of tax it would otherwise owe on Illinois miles. Westbound, Missouri and South Dakota shave a few cents when a stop is convenient. Test your own lane with the IFTA calculator.

How Iowa IFTA affects your filings

Iowa-based carriers license through the Iowa Department of Revenue and file the quarterly IFTA return with Iowa; pass-through carriers simply carry Iowa lines on their home-state return. The formula is the standard one: taxable gallons equal Iowa miles divided by truck MPG, times the rate. Drive 400 Iowa miles at 6.5 MPG and you burn 61.5 gallons — 61.5 times $0.325 is $20.00 of Iowa fuel tax. Total every jurisdiction, subtract the fuel tax already inside your pump receipts, and the net is what you owe or get refunded.

Calendar discipline matters more than rate-watching in Iowa, because the rates barely move. Returns are due April 30, July 31, October 31 and January 31, with late penalties typically $50 to $100 plus interest per missed quarter, and a required return even in zero-net quarters. Auditors generally request four consecutive quarters of fuel receipts, per-state distance records from your ELD or GPS, and the MPG calculation behind your return; mismatched receipts and miles remain the number one audit finding. One Iowa-specific note: if you run E-15 or higher blends in any units, remember the July 1, 2026 step from 26.5 to 28 cents when reconciling older receipts against the current matrix.