Section 12B: The Solar Tax Deduction for South African Businesses

For a business buying solar, the headline price is only half the story. The other half is how much of that cost the tax system gives back. Section 12B is the mechanism that does it, and it can change the economics of a deal substantially.

This guide explains what Section 12B is, who qualifies, and how it fits with solar finance. It is general information, not tax advice; clients should confirm their position with their own tax adviser.

What is Section 12B solar tax?

Section 12B(h) of the Income Tax Act is a capital allowance that lets a business deduct the cost of qualifying renewable energy assets from its taxable income on an accelerated basis, often 100% in the relevant year.

In plain terms, instead of writing the asset off slowly over many years, a qualifying business can deduct a large share of the cost quickly. That reduces taxable income, which reduces the tax bill, which lowers the real cost of going solar.

The deduction applies to the asset itself, so it is tied to ownership. That is the key link to finance structure.

Who qualifies for the Section 12B deduction?

The deduction is available to a business that owns a qualifying renewable energy asset used in the production of income. Two conditions matter most:

• Ownership. The business must own the asset. This is why Asset Finance is the relevant structure: the client borrows to buy and owns the system.
• Use in the business. The asset must be used to generate income, such as powering a commercial or production site.

Because ownership is the trigger, structures where the client does not own the asset, like a PPA, do not give the client this deduction. The comparison of who owns what under each structure is set out in solar finance structures compared.

How does Section 12B work with Asset Finance?

Asset Finance is the structure that pairs with Section 12B, because the client owns the asset while paying it off over 3 to 7 years.

The combination works like this:

• The client buys the qualifying solar asset using Asset Finance and owns it.
• The client claims the Section 12B deduction on the qualifying cost.
• The deduction lowers taxable income, reducing tax payable.

Alongside the capital allowance, there are further tax shields in a financed deal. Interest on the finance and ongoing operations and maintenance (O&M) costs can also reduce taxable income, and the system can generate I-REC (carbon) income. Together these stack to improve the after-tax return.

What is I-REC income and how does it help?

I-REC income refers to revenue earned from International Renewable Energy Certificates, which represent the renewable attributes of the electricity a system produces.

A qualifying solar system can generate these certificates, and they can be sold, creating an additional income stream on top of the energy savings. For a business case, that means three layers working together: the Section 12B deduction, the interest and O&M tax shields, and I-REC income. The full commercial picture is laid out in the commercial solar finance guide.

How do I show a client the Section 12B benefit?

The simplest way is to put it inside an indicative proposal so the client sees the structure and the indicative tax position together, early in the conversation.

ArkFlow lets installers build an indicative proposal that frames the deal around Asset Finance where Section 12B applies. The figures are indicative only and not a credit offer, and any tax position should be confirmed by the client's tax adviser, but it gives the client a realistic picture before they commit. See how the proposal works in the indicative proposal explained.

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Frequently asked questions

What is Section 12B?

Section 12B(h) of the Income Tax Act is a capital allowance that lets a South African business claim an accelerated, often 100%, deduction on qualifying renewable energy assets it owns and uses to produce income. It lowers taxable income and therefore the tax bill.

Does Section 12B apply to a PPA?

No. The deduction is tied to ownership of the asset. Under a PPA the client buys the electricity rather than owning the system, so the client does not claim Section 12B. Asset Finance, where the client owns the system, is the structure that unlocks it.

Can I claim Section 12B and the interest on finance?

A financed deal can stack benefits: the Section 12B capital allowance plus interest and O&M tax shields, alongside I-REC income. Each business should confirm exactly how these apply with its own tax adviser, as this is general information, not tax advice.

Is this tax advice?

No. This is general information about how Section 12B interacts with solar finance. Clients should confirm their specific position with a qualified tax adviser, and any indicative figures shown in a proposal are indicative only and not a credit offer.