Mining and resources businesses sit at one of the most complex intersections of Australian tax law. The combination of the Uniform Capital Allowances regime, the Petroleum Resource Rent Tax, state-by-state royalty obligations, and FBT exposure on FIFO worker arrangements means a bookkeeper who treats a mining client the same as a retail client will create material errors. This guide covers the key areas where mining bookkeeping diverges from standard practice.
Exploration vs. Development Expenditure: Getting the Capitalisation Right
The single most consequential classification question in mining bookkeeping is whether an expenditure relates to exploration or development. Under Division 40 of the ITAA 1997, specifically s.40-730, a miner can deduct exploration or prospecting expenditure in the year it is incurred — this covers costs of searching for minerals before a decision to mine is made. Once a decision to develop is made, subsequent expenditure is capitalised as a depreciating asset (the mining tenement or the development infrastructure) and depreciated over its effective life under the UCA framework.
In practice, the trigger point is the feasibility decision. Before that decision, geophysical surveys, drilling programs, and geological analysis are typically deductible. After the decision, access roads, processing plant construction, and shaft sinking are capitalised. Where a single invoice from a contractor spans both phases — common with early-stage drilling that feeds directly into a development scoping study — an allocation is required.
Rehabilitation costs should be provisioned under AASB 137 from the moment the obligation arises, typically when ground is disturbed. The provision is capitalised as part of the cost of the mine asset and depreciated over the mine's life. Expensing rehabilitation provisions as incurred is incorrect and will distort profitability reporting.
Petroleum Resource Rent Tax: A Separate Tax Entirely
PRRT is not a variant of income tax — it is a separate Commonwealth tax administered under the Petroleum Resource Rent Tax Assessment Act 1987 (PRRTAA). It applies to offshore petroleum projects and, since 2012 amendments, to onshore oil sands and the North West Shelf project.
PRRT is calculated on a project cash flow basis: receipts minus deductible expenditures, including exploration, development, and operating costs. Unused deductions are carried forward with an uplift factor (either the long-term bond rate plus 5% for exploration expenditures, or the long-term bond rate plus 15% for "starting base" assets). PRRT is deductible for income tax purposes under s.25-5 ITAA 1997.
From a bookkeeping perspective, PRRT requires its own ledger structure separate from income tax provisions. The instalment system under the PRRTAA requires quarterly payments for large projects; the bookkeeper must accrue these correctly and distinguish PRRT instalments from income tax instalments in the BAS and financial statements.
State Royalties: GST Traps and Calculation Bases
Every Australian mining jurisdiction charges royalties, but the bases and GST treatment differ. Western Australia imposes royalties on a value-at-point-of-sale or specific rate basis depending on the mineral. Queensland uses an ad valorem system tied to the market value of coal and minerals at the mine gate. South Australia and NSW have their own schedules.
The GST trap: royalties paid to state governments are treated differently depending on the specific legislative instrument. Some state royalty payments are not subject to GST (the state is not making a taxable supply when exercising its sovereign right to levy a royalty). However, if the royalty is structured as a licence fee or lease payment, it may carry GST. Incorrectly claiming GST credits on a non-taxable royalty payment is a common BAS error that triggers ATO adjustment notices. Always check the specific state royalty legislation and the relevant GSTR rulings before coding royalty payments.
FIFO Worker Benefits: PAYG, Housing, and FBT
Fly-in/fly-out work arrangements create layered tax obligations. The remote area housing exemption under s.51AF ITAA 1997 provides relief for employer-provided housing in remote areas — but this applies to housing at or near the work site, not accommodation at the worker's home city hub. FIFO subsidies that fund accommodation at a capital-city airport hotel between swings are not remote area housing benefits and attract FBT at the Type 1 or Type 2 gross-up rate.
Remote area housing provided on-site is an exempt fringe benefit under s.58ZC FBTAA 1986, provided the accommodation is the principal place of residence of the employee during the work roster. Many mining operators incorrectly treat all accommodation costs as exempt without analysing whether the on-site condition is met.
Under PAYG, the remote area exemption for living-away-from-home allowances requires the employee to genuinely maintain a separate home — documented by a declaration from the employee under Reg 2.51 of the ITAA 1997.
Fuel Tax Credits for Mining Operations
Mining operations are major users of fuel tax credits. Off-road diesel used in mining equipment — excavators, haul trucks, generators — qualifies for the full FTC rate (currently over 49 cents per litre). However, diesel used in light vehicles travelling on public roads attracts the reduced road-use rate net of the Road User Charge.
For large mines with mixed fleets, a fuel allocation methodology must be documented and consistently applied. ATO audit activity in the mining sector regularly focusses on FTC claims, particularly where a mine has on-site roads that could be classified as public roads.
End-of-Period Checklist for Mining Bookkeepers
- Confirm exploration vs. development classification for all expenditures incurred during the period; obtain written support for the feasibility decision date
- Recalculate the rehabilitation provision movement and update the mine asset value accordingly
- Reconcile PRRT instalment payments to the project cash flow model; accrue any shortfall
- Check state royalty invoices for GST — match against the relevant state legislative instrument before coding ITC claims
- Review FIFO accommodation benefits against the remote area housing exemption conditions; prepare FBT calculations for any non-exempt benefits
- Run FTC calculations using documented fuel allocation methodology; split off-road vs. road-use diesel quantities
- Ensure depreciation schedules for mining tenements and development assets use UCA effective life rates from the relevant ATO determination