IFTA does not create a new fuel tax.
It creates one reporting system for fuel-use taxes that already differ by jurisdiction.
An owner-operator buys diesel in one State, burns part of it in another and can cross several jurisdictions before the tank is refilled.
The tax paid at the pump therefore does not necessarily match the tax attributable to the roads where the fuel was consumed.
IFTA reconciles that difference.
The carrier files one return with the base jurisdiction.
The base jurisdiction then allocates the net tax or credit among the participating jurisdictions.
The arithmetic is manageable.
The recordkeeping is where carriers usually fail.
A correct quarterly return depends on three complete data sets:
- every relevant business mile;
- every gallon or other reportable fuel unit used;
- every valid tax-paid purchase by jurisdiction.
If one category is incomplete, the error can spread across the entire return.
First decide whether the operation belongs in IFTA
A carrier generally needs an IFTA license when:
- it is based in an IFTA member jurisdiction;
- it operates one or more qualified motor vehicles;
- those vehicles travel in two or more member jurisdictions.
A one-truck business can therefore be subject to the same quarterly filing system as a large fleet.
The number of trucks is not the deciding factor.
The qualified-motor-vehicle test
A motor vehicle used, designed or maintained to transport persons or property generally qualifies when it meets one of these tests:
| Vehicle configuration | Qualification rule |
|---|---|
| Two axles | Gross or registered gross weight exceeds 26,000 pounds |
| Three or more axles | Qualifies regardless of weight |
| Combination | Combined gross or registered gross weight exceeds 26,000 pounds |
Recreational vehicles used exclusively for personal pleasure are excluded from the definition.
Three axles can qualify below 26,001 pounds
A common mistake is to look only at weight.
A three-axle vehicle can be a qualified motor vehicle regardless of its registered weight.
Combination weight matters
A two-axle power unit below 26,001 pounds can become part of a qualified combination when the combined registered or gross weight exceeds the threshold.
USDOT and MC Numbers do not decide IFTA
A vehicle does not become IFTA-qualified because the carrier has:
- a USDOT Number;
- an MC Number;
- interstate operating authority;
- commercial insurance.
Those registrations answer different questions.
IFTA follows the vehicle and jurisdictional operation.
Interstate operation is required
A qualified motor vehicle operating exclusively in one jurisdiction generally does not need an IFTA license for that intrastate operation.
The carrier must still comply with that jurisdiction’s:
- fuel-use tax rules;
- registration;
- weight-distance taxes;
- intrastate permits.
Occasional interstate travel
IFTA, Inc. notes that a carrier operating normally in one jurisdiction but making occasional trips outside it can consider fuel-tax trip permits.
A trip permit can be more practical when interstate travel is rare.
The comparison should include:
- permit cost;
- administrative burden;
- frequency of travel;
- roadside risk;
- quarterly filing obligations.
A carrier making repeated interstate trips will usually find an IFTA license more practical than buying permits continuously.
Base jurisdiction
The carrier applies through its base jurisdiction.
The base jurisdiction is generally where:
- qualified vehicles are registered;
- operational control and records are maintained or can be made available;
- some fleet travel occurs.
The carrier should not choose a State only because its online application appears easier.
The business must satisfy the base-jurisdiction connection.
What the license and decals do
The base jurisdiction issues:
- one IFTA license for the carrier;
- two decals for each qualified motor vehicle.
A copy of the license is carried in each qualified vehicle operating under the account.
The decals are displayed on the exterior sides of the cab according to the jurisdiction’s instructions.
Annual renewal
IFTA credentials are calendar-year credentials.
The 2026 IFTA memorandum confirms a January and February display grace period for renewing carriers, but the renewal application itself had to be filed before the end of 2025.
The grace period did not allow carriers to delay the renewal application until February.
The same distinction should be checked each renewal year:
- application deadline;
- credential display period;
- prior-year credential conditions;
- trip-permit alternative.
Roadside failure
Operating without valid credentials can expose the truck to:
- citation;
- fine;
- trip-permit purchase;
- delay;
- account compliance action.
Carry the current license and verify both decals before dispatch.
IFTA reporting periods and deadlines
The ordinary reporting periods are calendar quarters.
| Quarter | Activity period | Standard due date |
|---|---|---|
| First quarter | January 1–March 31 | April 30 |
| Second quarter | April 1–June 30 | July 31 |
| Third quarter | July 1–September 30 | October 31 |
| Fourth quarter | October 1–December 31 | January 31 |
When the final day falls on a Saturday, Sunday or legal holiday, the next business day is generally treated as the due date.
Electronic filing and payment rules remain controlled by the base jurisdiction.
A return is still required with no operations
IFTA requires the quarterly return even when:
- the truck did not operate;
- no interstate travel occurred;
- no taxable fuel was used;
- no tax is due.
The carrier files the appropriate zero or no-operations return through the base jurisdiction.
Failure to receive a form or reminder does not remove the obligation.
Limited annual reporting
The 2026 Articles of Agreement allow a qualifying low-distance carrier to request annual filing when out-of-base-jurisdiction operations remain below the stated threshold.
Annual reporting requires approval from the base jurisdiction.
A carrier should continue quarterly filing until written approval says otherwise.
What the quarterly return reports
The standard return captures the movement and fuel activity of the qualified fleet.
It generally includes:
- total distance in all jurisdictions;
- total fuel consumed;
- distance by jurisdiction;
- taxable distance by jurisdiction;
- taxable fuel consumed by jurisdiction;
- tax-paid fuel purchased by jurisdiction;
- tax rate;
- net tax or credit;
- interest where applicable.
The carrier files one net return with the base jurisdiction.
A credit in one jurisdiction can offset tax due in another according to the return and base-jurisdiction process.
The calculation in five stages
The basic diesel calculation can be understood in five stages.
Stage 1: calculate total fleet distance
Add all reportable distance traveled by the qualified vehicles assigned to the fuel type for the quarter.
This can include:
- IFTA member-jurisdiction distance;
- non-IFTA jurisdiction distance where required for total fuel economy;
- trip-permit distance;
- taxable and nontaxable travel;
- business movement associated with the fleet.
The return then separates total and taxable jurisdiction distance as required.
Stage 2: calculate total fuel used
Add all fuel placed into the qualified vehicles during the same period.
Include fuel even when:
- the receipt was lost;
- no tax-paid credit can be claimed;
- the fuel came from bulk storage;
- it was purchased outside an IFTA jurisdiction.
The IFTA Procedures Manual states that all fuel placed into qualified vehicles must be reported to calculate the proper fuel-consumption factor and tax.
A missing receipt removes evidence for a tax-paid credit.
It does not remove the gallons from fuel used.
Stage 3: calculate fleet MPG
Use:
Fleet MPG = total distance ÷ total fuel used
Example:
- total distance: 30,000 miles;
- total diesel used: 5,000 gallons.
Fleet MPG:
- 30,000 ÷ 5,000;
- equals 6.00 MPG.
The fuel economy should be calculated separately by fuel type when multiple fuels are reported.
Stage 4: calculate taxable gallons in each jurisdiction
Use:
Jurisdiction taxable gallons = taxable jurisdiction miles ÷ fleet MPG
Example for Jurisdiction A:
- taxable miles: 9,000;
- fleet MPG: 6.00.
Taxable gallons:
- 9,000 ÷ 6.00;
- equals 1,500 gallons.
This estimates the fuel consumed while traveling those taxable miles.
Stage 5: compare consumed fuel with tax-paid purchases
Use:
Net taxable gallons = taxable gallons − tax-paid gallons purchased in that jurisdiction
Then:
Jurisdiction tax or credit = net taxable gallons × quarterly tax rate
If taxable gallons exceed tax-paid purchases:
- the carrier generally owes additional tax.
If tax-paid purchases exceed taxable gallons:
- the carrier can generate a credit, subject to the jurisdiction and return rules.
A complete three-jurisdiction example
Assume a one-truck carrier reports the following quarter.
Fleet totals
- total distance: 30,000 miles;
- total diesel used: 5,000 gallons;
- fleet MPG: 6.00.
Jurisdiction activity
| Jurisdiction | Taxable miles | Taxable gallons | Tax-paid gallons purchased |
|---|---|---|---|
| State A | 9,000 | 1,500 | 2,000 |
| State B | 12,000 | 2,000 | 1,200 |
| State C | 9,000 | 1,500 | 1,800 |
| Total | 30,000 | 5,000 | 5,000 |
Net taxable gallons
State A:
- 1,500 taxable gallons;
- minus 2,000 tax-paid gallons;
- equals 500 credit gallons.
State B:
- 2,000 taxable gallons;
- minus 1,200 tax-paid gallons;
- equals 800 taxable gallons due.
State C:
- 1,500 taxable gallons;
- minus 1,800 tax-paid gallons;
- equals 300 credit gallons.
Apply illustrative rates
Assume the applicable quarterly rates are:
- State A: $0.40;
- State B: $0.50;
- State C: $0.30.
State A credit:
- −500 × $0.40;
- equals −$200.
State B tax:
- 800 × $0.50;
- equals $400.
State C credit:
- −300 × $0.30;
- equals −$90.
Net before interest, surcharge or base-jurisdiction adjustments:
- $400 − $200 − $90;
- equals $110 due.
What the example teaches
The carrier bought exactly 5,000 gallons and consumed 5,000 gallons.
Tax is still due because too little tax-paid fuel was purchased in the higher-liability jurisdiction relative to fuel consumed there.
IFTA reallocates tax.
It does not charge simply because fuel was purchased cheaply in another State.
Use the rate for the correct quarter
Fuel-tax rates can change quarterly and can include:
- ordinary rate;
- surcharge;
- split rate;
- alternative-fuel treatment;
- jurisdiction note.
IFTA, Inc. publishes the Tax Rate Matrix and downloadable quarterly files.
Use the rate corresponding to:
- correct reporting quarter;
- correct jurisdiction;
- correct fuel type;
- correct rate code.
Do not reuse last quarter’s spreadsheet without updating rates.
Mid-quarter changes
A jurisdiction can have a split rate or special reporting instruction.
The 2026 IFTA site issued notices regarding rate changes and split-rate treatment.
The base-jurisdiction return or official instructions should determine how the activity is divided.
Report by fuel type
Diesel, gasoline and alternative fuels can require separate calculations.
The 2026 IFTA definition of motor fuels includes multiple energy types, including alternative fuels and electricity.
The standard form can require separate schedules for:
- diesel;
- gasoline;
- propane;
- LNG;
- CNG;
- electricity;
- other reportable fuels.
Do not mix gallons, equivalent units or different tax methods into one MPG calculation unless the official return specifically directs it.
Distance records: the foundation of the return
IFTA distance records must be sufficient for an auditor to verify:
- total distance;
- jurisdiction distance;
- vehicles included;
- routes and trips;
- accuracy of the accounting system.
A manual or trip-based distance record should generally contain:
- beginning and ending dates;
- origin and destination;
- route traveled;
- beginning and ending odometer, hubodometer, ECM or similar readings;
- total trip distance;
- distance by jurisdiction;
- VIN or unit number.
Actual distance, not paid miles
Broker or rate-confirmation miles are not enough.
Paid miles can differ from:
- odometer miles;
- actual route;
- fuel detours;
- parking movement;
- maintenance travel;
- rerouting.
IFTA reporting requires the truck’s actual relevant movement.
State-line mileage
The carrier must allocate distance accurately by jurisdiction.
Possible sources include:
- compliant tracking data;
- ELD or telematics exports;
- odometer readings;
- route records;
- trip sheets;
- fuel and toll evidence.
The system should reconcile total jurisdiction miles to total fleet miles.
Vehicle-tracking records
The 2026 Procedures Manual permits records created through vehicle-tracking systems when the required data is maintained.
The system generally must create a reading at least every ten minutes while the engine is on and retain:
- date and time;
- latitude and longitude to at least four decimal places;
- ECM odometer reading where available;
- VIN or unit number.
The data must be accessible in an electronic spreadsheet-compatible format such as:
- XLS;
- XLSX;
- CSV;
- delimited text.
Static images such as PDF, JPEG, PNG or Word are not accepted as the required vehicle-tracking data format under that provision.
A map screenshot is not the export
A carrier can see a complete route in the application and still lack auditable source data.
Before relying on an ELD or telematics provider, export one month and verify:
- raw timestamped records;
- jurisdiction calculation;
- odometer;
- vehicle identity;
- file format;
- access after cancellation.
ELD compliance does not guarantee IFTA compliance
An ELD can satisfy hours-of-service functions without producing the complete IFTA audit export the carrier needs.
Test the IFTA data independently from the roadside log.
Fuel records
The carrier must keep complete records of fuel:
- purchased;
- received;
- used in the business;
- placed into qualified vehicles.
Fuel should be traceable by:
- date;
- seller;
- quantity;
- fuel type;
- price;
- vehicle;
- purchaser.
Valid retail purchase evidence
The 2026 Procedures Manual recognizes evidence such as:
- seller receipt or invoice;
- credit-card receipt;
- third-party transaction listing;
- electronic or digital record of an original receipt or invoice.
For tax-paid credit, the record generally needs:
- purchase date;
- seller name and address or identified vendor code;
- quantity;
- fuel type;
- price per unit or total price;
- qualified vehicle identification;
- purchaser name with a legal connection to the licensee.
Fuel-card reports can be strong records
A fuel-card transaction listing can reduce receipt loss when it contains all required fields.
Check whether the export includes:
- unit number;
- driver;
- merchant;
- address;
- State;
- gallons;
- fuel type;
- date;
- amount.
A card statement that says only fuel purchase $650 is not enough.
Altered or illegible receipts
A base jurisdiction can deny tax-paid credit for records that are:
- altered;
- erased;
- illegible;
- unsupported.
A digital scan should preserve the original information clearly.
Bulk-fuel records
A carrier using bulk storage needs additional records.
These can include:
- delivery receipts;
- quarterly inventory reconciliation;
- tank capacity;
- every withdrawal;
- withdrawal date;
- quantity;
- fuel type;
- vehicle or equipment receiving the fuel.
Fuel remaining in storage is not automatically a vehicle tax-paid credit.
The carrier must document what was withdrawn into qualified vehicles.
Separate qualified vehicles and other equipment
A farm, construction or mixed business can dispense fuel into:
- qualified trucks;
- pickups;
- loaders;
- generators;
- reefer units;
- off-road equipment.
The bulk record must identify where each quantity went.
IFTA tax-paid credit cannot be assumed for fuel placed into nonqualified equipment.
Reefer fuel
Reefer fuel is not propulsion fuel for the truck.
It should be separated from fuel placed into the qualified vehicle’s propulsion tank.
A combined receipt can show:
- tractor diesel;
- reefer fuel;
- DEF.
The carrier should classify each line correctly.
Using total receipt gallons as tractor fuel can distort MPG and tax credit.
Trip permits and exempt miles
Distance traveled under a fuel-tax trip permit can have special treatment.
The IFTA Articles commentary explains that trip-permit miles can be included in total distance and jurisdiction distance but excluded from taxable miles for the permitted jurisdiction.
Fuel purchases can still be included in total fuel and tax-paid purchase fields where appropriate.
Why both numbers matter
The trip miles still affect actual fleet fuel economy.
The permit can change the taxable treatment of those miles.
Deleting the trip entirely can distort MPG.
Jurisdiction exemptions
Exemptions vary by jurisdiction.
A valid exemption can make certain distance nontaxable while the travel still remains part of total distance.
The carrier should preserve:
- legal basis;
- permit or emergency order;
- trip details;
- jurisdictions;
- dates;
- supporting documents.
Do not create an exemption category in the spreadsheet without an official source.
Reconcile distance and fuel monthly
Do not wait until the quarterly deadline.
A monthly close should reconcile:
- starting and ending odometer;
- ELD or tracking distance;
- distance by jurisdiction;
- fuel-card gallons;
- cash receipts;
- bulk withdrawals;
- non-propulsion fuel;
- trip permits;
- exempt miles.
Monthly vehicle summary
The IFTA Procedures Manual states that a monthly summary may be required for audit.
For each vehicle and fuel type, maintain:
- total distance;
- distance by jurisdiction;
- total fuel;
- tax-paid fuel by jurisdiction;
- calculated MPG;
- exceptions or corrections.
The reconciliation test
For the quarter:
Sum of jurisdiction distance = total reportable distance
And:
Fuel-card gallons + cash gallons + bulk withdrawals = total fuel placed into qualified vehicles
Differences should be explained before filing.
A practical one-truck quarterly workflow
During every trip
Capture:
- unit;
- trip dates;
- origin and destination;
- route;
- odometer;
- jurisdiction crossings;
- trip permit;
- unusual movement.
During every fuel purchase
Capture:
- date;
- seller;
- location;
- gallons;
- fuel type;
- price;
- unit;
- purchaser;
- reefer or tractor classification.
At month-end
Export:
- ELD or GPS data;
- fuel-card transactions;
- toll records;
- maintenance travel;
- cash fuel receipts.
Reconcile:
- odometer;
- mileage;
- gallons;
- jurisdiction totals.
At quarter-end
- Lock the quarter’s source records.
- Update the official tax rates.
- Calculate total distance and fuel.
- Calculate fleet MPG.
- Calculate taxable gallons by jurisdiction.
- enter tax-paid gallons.
- calculate tax, credit, surcharge and interest.
- compare return totals with source summaries.
- file and pay through the base jurisdiction.
- save the filed return and confirmation.
After filing
Retain:
- complete return;
- payment confirmation;
- rate schedule;
- calculation worksheet;
- source exports;
- corrections;
- notices;
- credit or refund treatment.
Record retention
The 2026 IFTA Procedures Manual generally requires the licensee to retain operational records for:
- four years after the return was due;
- or four years after it was filed;
- whichever date is later.
Additional time can apply because of:
- audit;
- waiver;
- jeopardy assessment;
- refund request;
- base-jurisdiction law.
Late filing extends the practical retention date
Suppose a return was due July 31 but was filed October 15.
The four-year period generally runs from the later filing date, not the original due date.
Keep records accessible
Records can be stored electronically.
They must remain:
- complete;
- readable;
- exportable;
- available to the auditor.
A cloud provider’s retention policy does not replace the carrier’s legal obligation.
Audit burden of proof
The IFTA Procedures Manual places the burden of proof on the licensee during an audit.
The auditor can use the best information available when the carrier cannot substantiate the return.
A carrier saying “the app calculated it” is not proof.
The carrier should be able to produce:
- raw distance;
- fuel evidence;
- calculation;
- reconciliation;
- filed return.
Inadequate records assessment
The 2026 Procedures Manual includes significant consequences for inadequate records.
The base jurisdiction can impose an additional assessment by:
- reducing reported fleet MPG to 4.00;
- or reducing the reported fuel-consumption factor by 20%;
- or increasing jurisdictional distance by 20% where the jurisdiction taxes by distance.
The jurisdiction can also:
- deny inadequately documented tax-paid fuel credit;
- use best information available;
- suspend, revoke or cancel the license;
- assess penalty and interest.
Why a lower MPG creates tax
Assume the carrier reports:
- 10,000 taxable miles;
- 6.5 MPG.
Taxable gallons:
- 10,000 ÷ 6.5;
- approximately 1,538.
If MPG is reduced to 4.0:
- 10,000 ÷ 4.0;
- equals 2,500 taxable gallons.
The assessment treats the vehicle as consuming 962 more gallons in that jurisdiction.
That can materially increase tax.
Penalties and interest
The 2026 Articles of Agreement permit the base jurisdiction to assess a penalty of:
- $50;
- or 10% of delinquent taxes;
- whichever is greater
for failure to file, late filing or underpayment.
The base jurisdiction can impose other penalties permitted by its law.
Interest is assessed on delinquent tax according to the applicable IFTA rules and jurisdiction treatment.
A zero return can still create a penalty
No tax due does not eliminate the filing obligation.
A carrier that forgets a no-operations return can still face:
- penalty;
- account suspension;
- renewal difficulty.
Common errors in owner-operator returns
Error 1: using loaded miles only
IFTA is based on qualified-vehicle distance, not revenue miles.
Include deadhead and other reportable movement.
Error 2: using dispatch miles
Dispatch software can show estimated or paid route miles.
Use actual movement.
Error 3: excluding gallons without receipts
All fuel used belongs in the MPG denominator.
The lost receipt affects tax-paid credit.
Error 4: counting reefer fuel as tractor fuel
Separate propulsion and non-propulsion purchases.
Error 5: assigning fuel to the wrong State
Use the actual seller location and jurisdiction.
Error 6: ignoring trip-permit miles
The permit changes taxable treatment but does not necessarily erase the distance from fleet totals.
Error 7: using annual MPG
Use the MPG for the reporting period and fuel type according to the return instructions.
Error 8: trusting a summary without raw exports
Retain auditable source data.
Error 9: filing only when tax is due
A quarterly return is still required when no operations occurred.
Error 10: buying fuel only to create an IFTA credit
A tax credit cannot justify:
- higher pump price;
- large detour;
- wasted time.
The return reconciles tax.
It does not make expensive fuel economically cheap.
How to evaluate IFTA software
A useful IFTA system should do more than show colored mileage on a map.
Test whether it can:
- identify every unit;
- separate fuel types;
- export timestamped tracking data;
- show jurisdiction crossings;
- reconcile odometer;
- import fuel-card transactions;
- identify missing receipts;
- separate reefer fuel;
- apply correct quarter rates;
- preserve filed reports;
- export records after cancellation.
Warning signs
- only PDF map output;
- no raw CSV;
- no odometer field;
- no vehicle identifier;
- no audit trail for corrections;
- automatic deletion after one year;
- no trip-permit treatment;
- black-box MPG calculation.
The carrier remains responsible when software is wrong.
One-truck audit file
A clean quarterly file can contain:
| Section | Contents |
|---|---|
| Filed return | Return, schedules, confirmation and payment |
| Distance | Raw tracking data, odometer and jurisdiction summary |
| Fuel | Fuel-card export, receipts and bulk records |
| Exceptions | Trip permits, exemptions and corrected records |
| Calculation | MPG, taxable gallons, tax-paid gallons and rates |
| Reconciliation | Mileage and gallon tie-out with explanation of differences |
The file should allow another person to reproduce the return.
Worked audit check
Assume the return reports:
- 28,000 total miles;
- 4,000 gallons;
- 7.00 MPG.
The auditor obtains:
- beginning and ending odometer showing 30,000 miles;
- fuel-card report showing 4,300 gallons.
Corrected fleet MPG:
- 30,000 ÷ 4,300;
- approximately 6.98 MPG.
The reported MPG appears similar.
The real problems are:
- 2,000 missing miles;
- 300 missing gallons;
- possible missing jurisdiction distance;
- possible missing fuel-tax credit.
The carrier must explain both differences.
A close MPG does not prove the return is complete.
Owner-operator versus leased operation
When equipment is leased, the lease should identify who is responsible for IFTA reporting.
Possible arrangements include:
- motor carrier reports the leased truck;
- owner-operator reports under own license;
- trip permits used;
- fuel and distance data exchanged.
The responsible party must have access to:
- miles;
- fuel;
- receipts;
- vehicle identity;
- tax returns.
A settlement statement alone may not contain enough audit detail.
Avoid duplicate or missing reporting
Confirm:
- whose decals are displayed;
- whose license is in the truck;
- whose return includes the vehicle;
- who retains the records;
- who claims tax-paid gallons.
One truck should not disappear between two systems or be reported twice.
IFTA and cost per mile
IFTA tax due or credit affects cash flow, but fuel tax should not be viewed in isolation.
For operating analysis, track:
- gross fuel purchases;
- card discounts;
- IFTA net settlement;
- mileage;
- MPG;
- fuel cost per mile.
A jurisdiction credit does not automatically mean the fuel stop was economical.
A tax due does not automatically mean the carrier chose the wrong fuel stop.
The real decision combines:
- final pump price;
- route;
- detour;
- jurisdiction tax;
- truck efficiency;
- cash timing.
Filing-day review
Before submitting the return, confirm:
- all vehicles included;
- all fuel types included;
- all jurisdictions included;
- total miles reconcile;
- taxable miles are supported;
- total fuel includes purchases without credit;
- tax-paid gallons have valid evidence;
- MPG is reasonable;
- official quarter rates are used;
- surcharge lines are complete;
- prior credit is applied correctly;
- payment method is ready;
- zero-activity status is correct.
Save the confirmation immediately after filing.
The calculation in one compact example
Assume:
- 24,000 total miles;
- 4,000 gallons;
- 6.00 MPG.
State X:
- 8,000 taxable miles;
- 1,333 taxable gallons;
- 1,000 tax-paid gallons;
- 333 net taxable gallons.
At an illustrative rate of $0.42:
- 333 × $0.42;
- equals $139.86 due.
State Y:
- 10,000 taxable miles;
- 1,667 taxable gallons;
- 2,000 tax-paid gallons;
- 333 credit gallons.
At an illustrative rate of $0.35:
- −333 × $0.35;
- equals −$116.55 credit.
State Z:
- 6,000 taxable miles;
- 1,000 taxable gallons;
- 1,000 tax-paid gallons;
- zero net gallons.
Net before other adjustments:
- $139.86 − $116.55;
- equals $23.31 due.
The tax result is small.
The return is still supported by:
- 24,000 miles;
- 4,000 gallons;
- three jurisdiction calculations;
- complete source records.
The practical rule
IFTA is a reconciliation system built on evidence.
The carrier does not begin with tax rates.
It begins with complete movement and fuel data.
Then it calculates:
- total distance;
- total fuel;
- fleet MPG;
- taxable gallons by jurisdiction;
- net taxable or credit gallons;
- tax or credit at the correct rate.
A mathematically correct return can still fail an audit when the source records are incomplete.