Zambia enacted the Income Tax (Amendment) Act No. 10 of 2025 on 8 August 2025, gazetted 19 August 2025, introducing three interlocking fiscal measures. First, a 1% Minimum Alternative Tax (MAT) on annual turnover applies to all companies and partnerships, creditable against standard income tax with a five-year carry-forward — directly raising the floor tax burden on large copper and cobalt mining groups that have historically reported low taxable profits. Second, the 50% annual loss carry-forward cap (previously mining-sector-specific) is universalised, reducing the tax-shelter advantage for capital-intensive mining projects with front-loaded losses. Third, withholding tax on government-securities interest is raised from 15% to 20%.

Analyst notesShow

Mechanism

The Act introduces a Minimum Alternative Tax (MAT) levied at 1% of total annual turnover on every company and partnership subject to income tax in Zambia. The MAT is designed to ensure that large revenue-generating entities — in particular, mining groups that have historically minimised taxable income through capital-allowance deductions, interest deductions, and accumulated losses — pay a floor level of tax regardless of declared profitability.

Key structural features of the MAT:

Creditable against standard income tax payable in the same year (no double taxation where profits are genuine).
Excess MAT credit carry-forwardable for up to five years — companies can recover overpayment once they return to full profitability.
Applies to all companies, not just mining, making it harder to challenge on discriminatory-treatment grounds.

The 50% loss carry-forward cap is the second consequential change for mining. Before this Act, the cap was already in place for mining operations specifically; the amendment universalises it to all income sources and all sectors. The practical impact on mining is the elimination of any remaining argument that non-mining income streams (royalties, trading income) within diversified mining-holding structures could absorb losses without limit.

The WHT increase on government securities (15% → 20%) primarily affects treasury-management decisions by mining companies holding Zambian kwacha liquidity in government bonds, but is not a material operational cost.

Why severity is set at 2

The MAT rate (1% of turnover) is modest relative to the headline corporate income tax rate (30%) and the existing mining royalties regime. For a copper miner operating at typical realised prices (~US$9,000/t), a 1% turnover levy translates to roughly US$90/t of copper produced — material but not existential. The five-year credit carry-forward mitigates the cash drag over the medium term. The action is an incremental tightening of the fiscal regime rather than a structural nationalisation or royalty reset. Severity is rated 2 (moderate) consistent with the prior Zambia fiscal instruments in the register.

Relationship to the broader Zambia fiscal tightening arc

This is the fifth distinct fiscal/regulatory instrument Zambia has applied to mining since 2022: 1. 2022-12-27 — MMDA sliding-scale copper royalty (royalty 4–10% of value, rate linked to LME price). 2. 2024-12-24 — Property Transfer Tax Amendment Act No. 27 of 2024 (transfer-pricing reforms on mining-asset disposals). 3. 2025-04-15 — Geological and Minerals Development Act 2025 (licensing overhaul, state participation rights). 4. 2025-10-13 — Mining Local Content SI 68/2025 (domestic procurement mandates). 5. 2025-08-08 — This Act (MAT, loss carry-forward universalisation, WHT increase).

The pattern is consistent with a state capture of mining rents via multiple overlapping instruments rather than a single royalty shock — harder to challenge at arbitration and harder for analysts to aggregate into a single effective-tax-rate number.

Downstream implications

First Quantum Minerals (Kansanshi, Sentinel): FQM has historically carried large deferred-tax assets in Zambia due to accumulated losses from capital-intensive expansions; the MAT creates an immediate cash outflow even where accounting profits remain elusive. FQM's 2025 Zambia EBITDA margin (c.35–40% at current copper prices) suggests the 1% turnover MAT equates to a ~2.5–3% effective rate uplift on operating cash flow.
Barrick (Lumwana): Lumwana is a large-scale, low-grade open-cut mine with high throughput volumes — a turnover-based tax is proportionally more burdensome than for higher-grade operations. Watch Lumwana Super Pit expansion economics.
Glencore (Mopani): Mopani returned to Glencore in 2024 after the ZCCM-IH episode; the smelting complex (cobalt by-product) is exactly the capital-intensive loss-carrier profile the MAT targets.

Open questions

Will the Zambia Revenue Authority issue interpretive guidance on the MAT crediting mechanism (particularly where mining companies pay royalties as a separate "income" stream)?
Does the MAT base include intra-group supply transactions, creating a risk of double-counting within vertically integrated mining groups?
How does the MAT interact with the stabilisation clauses in pre-2010 Development Agreements signed with Zambia's large copper mines?
Act No. 17 of 2025 (interest-deductibility cap at 30% EBITDA + USD functional-currency option) is the companion instrument; full effective-tax-rate analysis requires combining both Acts.

Sources

Primary: Act No. 10 of 2025 — Income Tax (Amendment) Act — Parliament of Zambia (PDF) · National Assembly of Zambia — Act No. 10 of 2025 landing page

Secondary: Orbitax — Zambia Introduces Minimum Alternative Tax and Increases WHT on Government Securities · PwC Zambia — 2025 Income Tax and Customs and Excise Amendment Bills · ZambiaLII — Income Tax (Amendment) Act, 2025 (Act No. 10)

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Mechanism

Key structural features of the MAT:

Creditable against standard income tax payable in the same year (no double taxation where profits are genuine).

Excess MAT credit carry-forwardable for up to five years — companies can recover overpayment once they return to full profitability.

Applies to all companies, not just mining, making it harder to challenge on discriminatory-treatment grounds.

Why severity is set at 2

Relationship to the broader Zambia fiscal tightening arc

Downstream implications

First Quantum Minerals (Kansanshi, Sentinel): FQM has historically carried large deferred-tax assets in Zambia due to accumulated losses from capital-intensive expansions; the MAT creates an immediate cash outflow even where accounting profits remain elusive. FQM's 2025 Zambia EBITDA margin (c.35–40% at current copper prices) suggests the 1% turnover MAT equates to a ~2.5–3% effective rate uplift on operating cash flow.

Barrick (Lumwana): Lumwana is a large-scale, low-grade open-cut mine with high throughput volumes — a turnover-based tax is proportionally more burdensome than for higher-grade operations. Watch Lumwana Super Pit expansion economics.

Glencore (Mopani): Mopani returned to Glencore in 2024 after the ZCCM-IH episode; the smelting complex (cobalt by-product) is exactly the capital-intensive loss-carrier profile the MAT targets.

Open questions

Will the Zambia Revenue Authority issue interpretive guidance on the MAT crediting mechanism (particularly where mining companies pay royalties as a separate "income" stream)?

Does the MAT base include intra-group supply transactions, creating a risk of double-counting within vertically integrated mining groups?

How does the MAT interact with the stabilisation clauses in pre-2010 Development Agreements signed with Zambia's large copper mines?

Act No. 17 of 2025 (interest-deductibility cap at 30% EBITDA + USD functional-currency option) is the companion instrument; full effective-tax-rate analysis requires combining both Acts.