IFTA Filing Guide
IFTA FILING
Miles • Fuel • Receipts
Use: file clean quarters + avoid surprises
IFTA Filing Guide: what you need, how to calculate it, and how to submit it.
IFTA filing is a quarterly reporting process that compares where you drove (jurisdiction miles) against where you bought fuel (tax paid at the pump). This guide walks through the records you need, how the math works, and how to avoid the most common reporting mistakes — especially when trips cross multiple states or provinces.
- Collect the right mileage and fuel records so your quarter is defensible.
- Understand “tax paid vs tax due” so the result makes sense (refund vs payment).
- Catch errors early: missing receipts, wrong jurisdictions, and mixed fuel types.
- Build a repeatable monthly routine so quarterly filing is easy.
Reporting cycle
Quarterly
Core inputs
Miles + gallons
Common miss
Missing receipts
Next best click
IFTA = miles vs fuel
Due: last day of next month
Keep records: 4 years
IFTA Filing: The “Two Streams” That Decide Refund vs Payment
Every clean IFTA quarter boils down to two streams: (1) where you drove (jurisdiction miles) and (2) where you bought fuel (tax-paid gallons). The return reconciles those streams so each jurisdiction gets its share.
IFTA in one picture
As-of Jan 2026
Stream A: Miles (distance)
Per-jurisdiction miles for the quarter (state/province). This is your “where tax is owed” map.
Source: ELD/GPS + trip sheets
Output: miles by jurisdiction
reconcile
Stream B: Fuel (tax paid)
Fuel receipts by jurisdiction and fuel type. This is your “credit already paid at the pump” stack.
Source: pump receipts / invoices
Output: tax-paid gallons by jurisdiction
The return compares fuel consumed in each jurisdiction (derived from miles/MPG) to tax-paid fuel bought there.
If you bought “more than you used” in a jurisdiction, you may receive credit. If you used “more than you bought,” you owe.
Tools: IFTA Calculator • Fuel Tax Rates (Quarterly) • Fuel Tax
Quarter-ready checklist (what you should have before you even log in)
Filing gets messy when you start with incomplete inputs. If you can answer these four questions, the return becomes straightforward.
Four “quarter-ready” inputs
- Miles by jurisdiction: a clean summary of state/province miles for the quarter.
- Fuel receipts: legible tax-paid receipts/invoices, organized by jurisdiction and fuel type.
- MPG sanity check: quarter MPG that passes the sniff test (outliers usually mean missing miles or receipts).
- Quarter boundary: confirm you didn’t mix months across quarters (Jan–Mar / Apr–Jun / Jul–Sep / Oct–Dec).
Record retention: many jurisdictions and compliance resources note keeping fuel & distance records for four years from the return due date or filing date (whichever is later). :contentReference[oaicite:0]{index=0}
The #1 reason quarters go sideways
Missing or incomplete fuel receipts. Without valid tax-paid documentation, auditors can deny credits. Build a habit: receipt captured → stored → summarized monthly.
Receipt detail expectations are spelled out in IFTA guidance (date, seller info, gallons/liters, fuel type, price, unit #, purchaser). :contentReference[oaicite:1]{index=1}
Quick “am I ready?” test
- Can you explain why you owe (or why you’re getting credit) in one sentence?
- Can you produce a receipt or invoice for every tax-paid gallon you’re claiming credit for?
- If audited, can you trace jurisdiction miles back to trip data for any random week in the quarter?
Due dates (the rule + a clean 2026 schedule)
Most jurisdictions follow the same rule: the return is due on the last day of the month following the quarter end. If that day falls on a weekend/holiday, it typically rolls to the next business day. :contentReference[oaicite:2]{index=2}
IFTA quarters & typical due dates
As-of Jan 2026
Q1
Jan 1 – Mar 31, 2026
Rule last day of April
Apr 30, 2026
Q2
Apr 1 – Jun 30, 2026
Rule last day of July
Jul 31, 2026
Q3
Jul 1 – Sep 30, 2026
Weekend roll if needed
Oct 31, 2026 (Sat) → Nov 2, 2026 typical roll
Q4
Oct 1 – Dec 31, 2026
Weekend roll if needed
Jan 31, 2027 (Sun) → Feb 1, 2027 typical roll
Your base jurisdiction may publish its own calendar and penalties, but the “last day of next month” rule is commonly printed directly on state IFTA return instructions. :contentReference[oaicite:3]{index=3}
How the IFTA math works (so the result makes sense)
The return is basically three calculations repeated by jurisdiction and fuel type: MPG → taxable gallons consumed → tax due minus tax-paid credit.
Worked example (illustrative, not your actual rates)
Use your state’s rates
Step 1 — Quarter MPG
MPG = total miles ÷ total gallons (for the quarter, by fuel type). Big swings usually mean a missing trip segment or missing receipts.
Total miles
25,000
All IFTA jurisdictions
Total gallons
4,100
Tax-paid + bulk (if any)
Quarter MPG
6.10
25,000 ÷ 4,100
Keep both fuel and distance records for years — many jurisdictions reference a 4-year retention window. :contentReference[oaicite:4]{index=4}
Step 2 — Jurisdiction reconciliation
Taxable gallons (consumed) ≈ jurisdiction miles ÷ quarter MPG. Then compare to tax-paid gallons purchased in that jurisdiction.
Idaho
Miles: 7,200
Consumed: 7,200 ÷ 6.10 = 1,180 gal
Tax-paid bought: 1,050 gal
Net: +130 gal taxed
Utah
Miles: 5,100
Consumed: 5,100 ÷ 6.10 = 836 gal
Tax-paid bought: 980 gal
Net: –144 gal credit
Oregon
Miles: 3,400
Consumed: 3,400 ÷ 6.10 = 557 gal
Tax-paid bought: 300 gal
Net: +257 gal taxed
The “rates” layer changes quarterly—use your base jurisdiction’s published rate table (or use your tool page). Fuel Tax Rates • IFTA Calculator
Why you owe vs why you get a refund
- You owe when you consumed more fuel in a jurisdiction than you bought there tax-paid.
- You get credit when you bought more tax-paid fuel in a jurisdiction than you consumed there.
- Small errors compound: one missing receipt can flip a jurisdiction from credit → tax due.
MPG sanity ranges (practical)
You don’t need “perfect MPG.” You need “credible MPG.” If your quarter MPG is wildly high/low vs your normal operation, assume missing miles or missing receipts until proven otherwise.
Make this a habit: run a monthly mini-close so quarter close is painless.
Fuel receipts: what makes them “credit-eligible”
You can only claim tax-paid credit for gallons you can support. IFTA guidance and state recordkeeping pages list the fields an acceptable receipt or invoice should contain. :contentReference[oaicite:5]{index=5}
Minimum receipt details to protect your tax-paid credits
Keep legible copies
✓Date of purchase (not just a month)
✓Seller name + address/location (city/state)
✓Gallons/liters purchased
✓Fuel type (diesel / gasoline / etc.)
✓Price per gallon or total sale amount
✓Unit / vehicle identifier (unit # / plate) when applicable
✓Purchaser name or account/card trace
✓Evidence fuel tax was paid for tax-paid credit eligibility
State guidance commonly stresses that receipts must show tax-paid fuel to claim credit. :contentReference[oaicite:6]{index=6}
Bulk fuel note (if you have tanks)
Bulk fuel requires additional discipline: delivery tickets, inventory controls, and documented withdrawals to units. If you’re not doing that cleanly, bulk fuel becomes an audit magnet. (See IFTA best practices guidance on bulk fuel.) :contentReference[oaicite:7]{index=7}
The monthly routine that makes quarterly filing easy
The fastest way to stop IFTA “surprises” is to run a 20-minute monthly close. You’re not filing monthly — you’re keeping the quarter clean.
Monthly IFTA close (20 minutes)
Do this 3× per quarter
1) Capture receipts
Every fuel stop: receipt photographed/scanned same day. Sort by jurisdiction + fuel type.
Goal: zero missing
Fix: faded slips
2) Reconcile miles
Export jurisdiction miles summary. Spot check one week for obvious gaps or wrong state tagging.
Goal: believable map
Fix: route gaps
3) MPG sanity
Compute month MPG and compare to normal. If it’s off, find the missing input now—before quarter end.
Goal: credible MPG
Fix: missing fuel
After month 3, your quarter close is just “sum the months” + finalize rates.
Due date rule of thumb: last day of the month following the quarter end. :contentReference[oaicite:8]{index=8}
If you want a button that does the math: Use the IFTA Calculator.
Templates (copy/paste ready)
These templates make audits boring: a monthly checklist, a receipt rejection rule, and an evidence binder index.
IFTA templates
No scripts
Monthly IFTA Close (20-minute checklist)
Copy/paste
MONTHLY IFTA CLOSE (CHECKLIST)
Miles:
[ ] Export jurisdiction miles for the month
[ ] Spot check one week for gaps / wrong state tags
[ ] Confirm month dates belong in the correct quarter
Fuel:
[ ] Confirm every fuel purchase has a legible receipt/invoice
[ ] Separate receipts by jurisdiction + fuel type
[ ] Flag missing details (date, location, gallons, fuel type, price, unit/account)
Sanity:
[ ] Compute month MPG (miles ÷ gallons) and compare to normal
[ ] Investigate outliers immediately (missing trip segment / missing receipt)
Output:
[ ] Save month summary PDFs/CSVs into quarter folder
[ ] Note any corrections made (what/when/who)
Record retention is often referenced as 4 years from return due/filing date (whichever later). :contentReference[oaicite:9]{index=9}
Receipt Rejection Rules (simple)
Driver/office policy
RECEIPT RULES (TAX-PAID CREDIT)
A receipt/invoice is NOT acceptable if it is:
- Illegible / faded / missing gallons
- Missing date or missing location (city/state)
- Missing fuel type (diesel/gas/etc.)
- A pre-authorization slip only
- Missing seller name/address OR no traceable vendor invoice
- Does not show evidence of tax-paid fuel where required for credit
Action:
[ ] Driver must obtain a corrected receipt OR vendor invoice
[ ] Office flags purchase as “no-credit” until corrected
Receipt fields are widely listed in IFTA best practices and state guidance. :contentReference[oaicite:10]{index=10}
Quarter Folder Layout (recommended)
Simple & auditable
IFTA / 2026 / Q2 /
/Miles/
2026-04_jurisdiction-miles.csv
2026-05_jurisdiction-miles.csv
2026-06_jurisdiction-miles.csv
Q2_miles_summary.pdf
/Fuel/
2026-04_receipts/
2026-05_receipts/
2026-06_receipts/
Q2_fuel_summary_by_jurisdiction.xlsx
/Rates/
Q2_rate_table.pdf (from base jurisdiction)
/Return/
Q2_filed_return.pdf
Q2_payment_confirmation.pdf (or refund notice)
/Notes/
corrections_log.txt (what changed, why, and who)
Due date rule of thumb: last day of month after quarter end (weekend/holiday rolls). :contentReference[oaicite:11]{index=11}
Audit Binder Index (one-page)
Print this
IFTA AUDIT BINDER — INDEX
1) Filed returns (by quarter)
2) Jurisdiction miles summaries (source exports + summaries)
3) Fuel receipts/invoices (tax-paid documentation)
4) Bulk fuel records (if applicable): delivery tickets + inventory + withdrawals
5) Rate tables used (quarterly rates from base jurisdiction)
6) Corrections log (what changed, why, and supporting proof)
7) Policies: receipt rules + monthly close checklist
8) Contact list: who exports miles, who reconciles fuel, who files
Retention: keep fuel & distance records for 4 years from due/filing date (whichever later), per many jurisdiction manuals. :contentReference[oaicite:12]{index=12}
FAQ
When is IFTA due each quarter?
A common rule printed on state return instructions is the last day of the month following the end of the quarter,
with weekend/holiday roll to the next business day. :contentReference[oaicite:13]{index=13}
How long do I need to keep IFTA records?
Many jurisdiction manuals and compliance resources reference retaining fuel and distance records for four years
from the return due date or filing date (whichever is later). :contentReference[oaicite:14]{index=14}
Why does my MPG look “wrong” this quarter?
The two most common causes are (1) missing miles (trip gap / wrong jurisdiction tagging) or (2) missing fuel receipts.
Fix the inputs first—don’t “force” the math.
What makes a fuel receipt valid for tax-paid credit?
IFTA guidance and state recordkeeping pages commonly list: date, seller name/address (location), gallons, fuel type,
price/total sale, unit/vehicle identifier, purchaser info, and evidence of tax-paid fuel for credit eligibility. :contentReference[oaicite:15]{index=15}
Do I need to submit receipts with the return?
Many jurisdictions do not require receipts to be submitted with the quarterly return, but you must retain supporting documentation to defend tax-paid credits in an audit. :contentReference[oaicite:16]{index=16}
Quick next steps
If you want IFTA to stop being stressful, start here.
- 1) Create the quarter folder layout (so records don’t scatter).
- 2) Enforce receipt rules (no legible receipt = no credit until fixed).
- 3) Run a 20-minute monthly close (miles + fuel + MPG sanity).
- 4) Use the correct quarterly rate table for your base jurisdiction.
- 5) If you’re behind: file clean first, then improve process so next quarter is easy.
Use your tools: IFTA Calculator • Fuel Tax Rates
Back to top