What Section 12B is, in plain language
Section 12B of the South African Income Tax Act is the rule that lets a business write off the cost of a photovoltaic (PV) solar system against its taxable income, instead of waiting twenty years for the asset to wear out on paper. It is the single most useful tax lever for any company that wants to lower the after-tax cost of owning solar. Municipal electricity tariffs are set to rise by an average of 9.01 percent from 1 July 2026, according to Eskom, which is one reason more businesses look at their own generation.
Most business owners hear the word "rebate" and think of the R15 000 residential rebate from SARS. That ceiling applies to individuals buying panels for a home. A business is playing a different game entirely, because Section 12B sits on the company side of the Income Tax Act.
What changed after February 2025
Before February 2025, Section 12B allowed a 50/30/20 accelerated write-off across the first three years of an asset’s life. The rules now allow an even faster path, an accelerated one-year deduction for qualifying renewable generation assets in the year they are first brought into use, subject to the 1 MW cap and the usual definitions of "renewable energy" in the Act.
If you are reading an older blog post that still talks about three tax years and percentages, it is out of date. Ask your tax practitioner to confirm the current write-off profile before you sign anything that quotes a specific payback window.
Who can claim the solar tax incentive
Companies, close corporations and sole traders
Any taxpayer carrying on a trade in South Africa can claim Section 12B. That includes private companies, public companies, close corporations, and sole proprietors who are registered for income tax and have a valid tax reference number. The system has to be used in the production of income, which in practice means it has to serve a real business activity, not a private lifestyle.
The residential carve-out
A home system does not qualify for Section 12B, even if the owner runs a small business from a study. Residential PV falls under the separate SARS solar tax rebate, which caps at 25% of the cost of new and unused panels, up to a maximum of R15 000. Businesses that try to route a home install through Section 12B usually end up with an assessment they did not expect.
What assets qualify, and what gets excluded
The qualifying cost under Section 12B covers the PV panels, the inverter, mounting structures, cabling, isolators, and the balance-of-system parts that make the plant work. Land, the building the panels sit on, grid-connection fees paid to the municipality, and any financing costs are carved out. VAT input that the business claims on the same invoice is also carved out of the depreciable base, which is the most common trap on this list.
The 1 MW cap matters here. Anything below 1 MW sits in the small-scale embedded generation bracket covered by SAPVIA, and that is the same threshold the Act uses to decide whether Section 12B is the right section at all.
How the deduction is calculated
The depreciable base after VAT
Take the total installed cost, remove the VAT you claimed as input tax, then apply the current write-off profile. The depreciation runs against that net base, not the gross invoice. A simple way to read this: if you claim VAT on the same asset, you cannot also depreciate the VAT. The two must be reconciled on the same schedule.
Recoupment when an asset is sold or removed
If the system is sold, scrapped, or removed before the deduction is fully used up, SARS claws back the unutilised portion as recoupment in the year of disposal. That recoupment is taxable. Plan for it before you sign a five-year plan to upgrade the roof, or before you hand the asset to a new tenant.
Section 12B and the three ways a business pays for solar
This is where the rule starts to bite into the commercial decision. The same set of panels can attract very different tax treatment depending on who owns them, and who is named on the invoice.
Buying the system outright
The business owns the asset, holds the Certificate of Compliance from a registered electrician, and claims Section 12B on the company return. This is the cleanest path and the one most tax practitioners are comfortable signing off.
A rent-to-own finance agreement
Under a rent-to-own structure, ownership transfers to the customer at the end of the term. The customer is the one who ultimately claims Section 12B, once title passes. Until then, the instalments are treated as operating cost in most setups, so the tax benefit arrives later than the cash flow saving.
A power purchase agreement
A power purchase agreement (PPA) is a service. The provider owns the panels, sells the electricity, and claims Section 12B on its own books. The customer pays a per-kilowatt-hour tariff and enjoys cheaper power, but does not own a depreciable asset and so does not claim Section 12B. This is the structure that catches most buyers out, because the marketing sounds like ownership but the tax treatment is that of a tenant.
A wheeling arrangement
Wheeling means the business draws solar electricity from a third-party plant through the Eskom or municipal grid, with a wheeling charge and a use-of-system charge layered on top. The generator or the trader usually claims Section 12B on the plant. The end customer can still claim the use-of-system portion if it owns its own portion of the infrastructure, but the main deduction sits with whoever built the plant.
How Section 12B fits with VAT
VAT and Section 12B have to be reconciled on the same asset, on the same return, in the same year. If a vendor claims input VAT on the invoice, the Section 12B base drops by the VAT portion, and the deduction runs against the remaining balance. Double-dipping is the fastest way to trigger a SARS adjustment, and SARS reviews these numbers line by line.
Talk to your tax practitioner before you decide whether to claim the input VAT or push it into the depreciable base. Both routes are legal, but they change the size of the deduction and the size of the cash refund, and most businesses benefit from modelling both before signing.
Documents SARS expects on review
On assessment, SARS typically asks for the tax invoice, the Certificate of Compliance from a registered electrician, the asset register entry showing the in-service date, and the fixed-asset schedule that ties the depreciation to the return. For grid-tied systems, the municipal permission-to-operate letter and the SSEG application approval are also part of the file.
If the system is in a sectional-title or shared property, an allocation schedule showing how the cost is split between entities is part of the supporting pack. Keep all of this for five years from the date of the assessment.
Common mistakes that trigger SARS adjustments
The single biggest error is claiming VAT input on the same asset that is being depreciated under Section 12B without reducing the base. The second is treating a power purchase agreement as if the customer owns the asset and is entitled to the deduction. The third is using the old 50/30/20 profile on a return for an asset brought into use after February 2025.
A quieter mistake is mixing residential and commercial activity in one asset. If a roof serves both a home office and a rental tenant, the cost has to be split on a reasonable basis before the deduction is calculated, and the residential slice is dealt with under the SARS residential rebate instead.
How to claim, step by step
Step one: confirm the asset is brought into use in the current tax year, and that the SSEG approval is in hand. Step two: ask your tax practitioner to classify the asset under Section 12B on the fixed-asset schedule. Step three: ensure the depreciable base reflects any VAT input claimed, and that the write-off profile matches the current rule. Step four: complete the relevant income tax return, file the supporting schedules, and keep the file ready for review.
ZenSolar works through approved installers who issue the right paperwork on day one, including the Certificate of Compliance from a registered electrician. That document travels with every warranty and every tax claim for as long as the system is on the roof.
FAQ
Which SARS form carries the Section 12B deduction? The deduction sits on the company income tax return (ITR14 for companies, ITR12 for sole traders) and is supported by the fixed-asset schedule and the wear-and-tear schedule that your tax practitioner files alongside the return.
Can a business renting its premises still claim Section 12B? Only if it owns the solar asset or is on a rent-to-own path that transfers title. A tenant that simply pays a tariff under a PPA does not own a depreciable asset and cannot claim Section 12B.
Does a power purchase agreement qualify the customer for Section 12B? No. The PPA provider owns the asset and claims the deduction on its own return. The customer buys electricity and treats the tariff as an operating expense.
What is the difference between Section 12B and Section 12S for solar? Section 12B covers the generation asset itself. Section 12S deals with energy efficiency savings and is used for a different set of improvements. A PV system typically lives under 12B, not 12S.
How long does SARS take to process a Section 12B claim? The deduction is processed as part of the normal income tax assessment. Turnaround depends on whether the return is selected for verification, but most clean claims are assessed within the standard cycle.
Ready to model Section 12B against your own roof and your own tariff? Book a site visit with an approved ZenSolar installer and get a number you can take to your tax practitioner.
