How HBA Impacts Tax Calculations in Indonesia

For coal companies, HBA (Harga Batubara Acuan) affects taxes both directly and indirectly because it influences the declared value of coal sales, which in turn affects taxable income and government levies.

HBA is often used by tax authorities and auditors as a benchmark to assess whether coal sales are conducted at reasonable market prices.

Example

If a miner reports:

• Sales Volume: 1,000,000 tonnes
• Selling Price: USD 90/t

while the relevant HBA is:

• HBA: USD 124.44/t

the tax authority may scrutinize whether the reported selling price reflects an arm’s-length transaction.

Lower reported prices mean:

Lower Revenue

↓

Lower Profit

↓

Lower Corporate Income Tax

Because of this, benchmark prices such as HBA can become an important reference in transfer pricing reviews.

2. Transfer Pricing Compliance

This is particularly important for:

• Coal producers selling to affiliated traders
• Mine-to-trading-arm transactions
• Cross-border related-party sales

Example:

Mining Company (Indonesia)

↓

Related Trading Company (Singapore)

↓

End Buyer

If the sale price between related parties is significantly below benchmark levels, tax authorities may question the transaction.

For this reason many taxpayers maintain documentation showing:

• HBA
• ICI
• McCloskey
• Actual coal specifications
• Commercial adjustments

to justify the final sales price.

3. Value Added Tax (VAT / PPN)

Certain mining transactions involve VAT reporting obligations.

Since HBA helps determine the value of coal sold, it influences:

• Tax invoice values
• Reported revenue
• VAT calculations where applicable

Higher benchmark-related pricing generally results in a higher transaction value reported for tax purposes.

4. Non-Tax State Revenue (PNBP)

Although technically not a tax, this is one of the biggest fiscal impacts.

The government uses coal pricing references to calculate:

• Royalties
• PNBP obligations
• State revenue from mining activities

Example:

Item	Scenario A	Scenario B
Sales Volume	1 Mt	1 Mt
Coal Price	USD 60/t	USD 120/t
Revenue	USD 60 M	USD 120 M
Royalty Base	Lower	Higher

A rise in HBA generally increases the royalty base.

5. Deferred Tax and Financial Reporting

Coal companies also use benchmark prices when preparing:

• Revenue forecasts
• Asset impairment reviews
• Reserve valuations
• Deferred tax calculations

When HBA rises:

• Expected future revenue rises.
• Taxable profits may increase.
• Deferred tax balances may change.

This is closely watched by listed coal companies.

August 2026 Example

Using the HBA values from your benchmark table:

Grade	HBA (USD/t)
6322 GAR	124.44
5300 GAR	93.27
4100 GAR	65.48
3400 GAR	45.27

A producer selling:

• High CV coal at USD 124/t
• Low CV coal at USD 45/t

will have very different:

• Revenue
• Royalty obligations
• Taxable profits
• Corporate income tax exposure

simply because the benchmark values differ substantially.

SMARTIN News Commentary

How HBA Affects Tax Calculations

HBA serves as Indonesia’s official coal benchmark and plays an important role in determining the economic value of coal transactions. While corporate income tax rates are not directly linked to HBA, the benchmark influences reported revenue, royalty obligations, and transfer-pricing assessments. Tax authorities may use HBA and other recognized coal indices as reference points when reviewing coal sales, particularly transactions between related parties. As HBA rises, coal producers typically report higher revenues, resulting in increased royalty payments and potentially higher taxable profits.