What Is the Section 12B Solar Tax Benefit?
Section 12B of the South African Income Tax Act (No. 58 of 1962) allows businesses to claim an accelerated depreciation allowance on qualifying renewable energy assets. For photovoltaic (PV) solar systems under 1 MW, this means a 100% deduction in the first year of use.
In plain terms: the full cost of your solar installation — panels, inverters, mounting structures, cabling, and installation labour — can be deducted from your taxable income in the year the system is brought into use. No spreading it over multiple years. No complicated phasing. One year, full deduction.
Why this matters for your business:
- Immediate cash flow benefit. You reduce your tax liability in the same financial year you install solar.
- Lower effective cost of solar. The tax saving reduces the real cost of your system by up to 27%.
- Stacks with electricity savings. You save on your tax bill and your electricity bill from day one.
- No cap on system value. Whether your system costs R500,000 or R5 million, the full amount qualifies (provided it's under 1 MW generation capacity).
This is not a rebate you have to apply for separately. It's a deduction claimed through your normal tax return, assessed by SARS under existing legislation.
How Much Will You Actually Save?
The calculation is straightforward. You take the total cost of your qualifying solar system, multiply it by 100% (the Section 12B deduction rate), and then multiply by your corporate tax rate to determine your actual rand saving.
The formula:
Tax Saving = System Cost x 100% (Section 12B Deduction) x 27% (Corporate Tax Rate)
Example Calculation Table
| System Size | Typical Cost Range | Section 12B Deduction (100%) | Tax Saving at 27% | Effective System Cost After Tax Benefit |
|---|---|---|---|---|
| 50 kWp | R675,000 - R800,000 | R675,000 - R800,000 | R182,250 - R216,000 | R492,750 - R584,000 |
| 100 kWp | R1,350,000 - R1,600,000 | R1,350,000 - R1,600,000 | R364,500 - R432,000 | R985,500 - R1,168,000 |
| 250 kWp | R2,625,000 - R3,250,000 | R2,625,000 - R3,250,000 | R708,750 - R877,500 | R1,916,250 - R2,372,500 |
| 500 kWp | R5,250,000 - R6,500,000 | R5,250,000 - R6,500,000 | R1,417,500 - R1,755,000 | R3,832,500 - R4,745,000 |
Cost ranges reflect typical installed pricing for commercial solar in Gauteng. Sub-100 kWp systems: R13,500-R16,000/kWp. Systems above 500 kWp: R10,500-R13,000/kWp. Your actual cost depends on roof type, electrical infrastructure, and system design.
Worked Example: 100 kWp System
A Gauteng-based manufacturing company installs a 100 kWp grid-tie solar system at a total cost of R1,500,000.
| Item | Amount |
|---|---|
| Total system cost (installed) | R1,500,000 |
| Section 12B deduction (100% in Year 1) | R1,500,000 |
| Tax saving at 27% corporate rate | R405,000 |
| Effective cost after tax benefit | R1,095,000 |
| Estimated annual electricity saving | R350,000 - R420,000 |
| Effective payback period (after tax benefit) | 2.6 - 3.1 years |
Without the tax benefit, the payback period would be 3.6-4.3 years. Section 12B shaves more than a year off.
The Compounding Effect: Tax Savings + Electricity Savings
Section 12B is not your only saving. With Eskom's latest tariff increase of 12.74% from April 2025, every unit of solar electricity you generate becomes more valuable each year. Your solar system locks in a fixed cost of energy while grid prices keep climbing.
Year-by-year savings on a R1.5M system (100 kWp):
| Year | Tax Benefit | Electricity Saving (Est.) | Total Annual Saving |
|---|---|---|---|
| Year 1 | R405,000 | R380,000 | R785,000 |
| Year 2 | — | R428,000 | R428,000 |
| Year 3 | — | R483,000 | R483,000 |
| Year 4 | — | R544,000 | R544,000 |
| Year 5 | — | R614,000 | R614,000 |
| 5-Year Total | R405,000 | R2,449,000 | R2,854,000 |
Electricity savings assume 12% annual tariff escalation and 0.5% annual panel degradation. Actual savings depend on consumption patterns, system size, and tariff structure.
That's nearly double the system cost returned within five years. Use our Solar Savings Calculator to model the numbers for your specific business.
Does Your Business Qualify for Section 12B?
Section 12B has clear qualifying criteria. Your installation must meet all of the following:
1. The asset must be new and unused Second-hand panels or refurbished inverters do not qualify. Every component claimed under Section 12B must be brand new, purchased from an authorised supplier.
2. The asset must be owned by the taxpayer The business claiming the deduction must own the solar system. If you lease your system or enter into a rental arrangement, the deduction belongs to the asset owner, not the user. (This is an important consideration when evaluating Power Purchase Agreements versus outright purchase.)
3. The asset must be used in the taxpayer's trade The solar system must be used for the purpose of your trade — generating electricity for your business operations. A system installed on a property you own but don't operate from may not qualify. Consult your tax advisor on specific scenarios.
4. The system must be brought into use The deduction is claimed in the year of assessment in which the asset is first brought into use — not when the order is placed or when installation begins. Commissioning date matters.
5. PV solar energy below 1 MW generation capacity Section 12B's 100% first-year allowance applies specifically to photovoltaic solar energy systems with a generation capacity of less than 1 MW (1,000 kWp). Systems of 1 MW and above follow different depreciation schedules.
What qualifies as a deductible cost?
The following components and costs typically qualify under Section 12B:
- Solar PV panels/modules
- Inverters (string or micro)
- Mounting structures and racking
- DC and AC cabling
- Distribution boards and switchgear (solar-specific)
- Monitoring systems
- Installation and commissioning labour
- Delivery to site
What does not qualify:
- Building modifications not directly related to the solar system (e.g., roof repairs unrelated to panel mounting)
- Battery storage claimed under Section 12B must be evaluated separately — batteries may qualify under different provisions depending on configuration. Speak to your tax advisor.
- Maintenance contracts or extended warranties purchased separately
Important: Gentricity provides a detailed, itemised invoice for every installation, clearly separating qualifying and non-qualifying costs. This gives your accountant exactly what they need to process the Section 12B claim.
Section 12B vs Section 12BA — What Changed?
If you've been researching solar tax incentives, you'll have seen references to both Section 12B and Section 12BA. Here's the distinction:
| Feature | Section 12B | Section 12BA (Expired) |
|---|---|---|
| Deduction rate | 100% in Year 1 | 125% in Year 1 |
| Status | Active — currently available | Expired 28 February 2025 |
| Applicable assets | PV solar under 1 MW | Renewable energy assets used in production of income |
| Qualifying period | No announced expiry | Assets brought into use between 1 March 2023 and 28 February 2025 |
| Tax saving on R1.5M system (27% rate) | R405,000 | R506,250 |
| Extra benefit over 12B | Baseline | R101,250 additional |
What happened to the 125% deduction?
Section 12BA was introduced as a temporary enhanced incentive to accelerate renewable energy adoption during South Africa's energy crisis. It offered a 125% first-year deduction — meaning businesses could deduct more than the actual cost of the asset. On a R1.5M system, that translated to a R1,875,000 deduction and a R506,250 tax saving.
Section 12BA expired on 28 February 2025. Any solar system not brought into use before that date cannot claim the 125% deduction.
The good news: Section 12B remains
Section 12B's 100% first-year deduction is an established provision of the Income Tax Act with no announced expiry date. While you can no longer claim 125%, a 100% first-year write-off is still an exceptional incentive by any measure.
To put it in perspective: most capital equipment depreciates over 3-6 years for tax purposes. Solar gets a full write-off in year one. The financial case for commercial solar remains compelling.
How to Claim Your Section 12B Deduction
Claiming Section 12B is done through your annual tax return. There is no separate application to SARS. Here's the process:
Step 1: Get a Professional Solar Assessment
Contact Gentricity for a free assessment. We'll evaluate your premises, energy usage, and roof suitability to design a system that maximises both your electricity savings and your Section 12B benefit.
Step 2: Confirm Timing with Your Tax Advisor
Section 12B is claimed in the tax year the system is brought into use (commissioned). Work with your accountant to align your installation timeline with your financial year for optimal tax benefit.
Step 3: Approve Your System Design and Quotation
Once you're satisfied with the proposed system, approve the design and sign off on the project. Gentricity provides a detailed, itemised quotation that separates all qualifying components for Section 12B purposes.
Step 4: Installation and Commissioning
Gentricity handles the complete installation — from structural engineering sign-off to municipal registration and grid connection. Average installation time for a commercial system: 3-6 weeks depending on system size and complexity.
Step 5: Receive Your Commissioning Documentation
Upon completion, you receive:
- A detailed, itemised tax invoice
- Commissioning certificate with date
- System specifications and component serial numbers
- Electrical Certificate of Compliance (COC)
- Municipal approval documentation
Step 6: Claim the Deduction
Your accountant or tax practitioner includes the Section 12B deduction on your annual income tax return (IT14 for companies). The commissioning certificate and tax invoice serve as supporting documentation.
Timing tip: If your financial year-end is approaching, contact us early. A system commissioned on 28 February versus 1 March falls into different tax years. Planning ahead ensures you get the benefit in the right year.
How to Finance Solar and Still Get the Tax Benefit
You don't need R1.5 million in cash to take advantage of Section 12B. Several financing structures preserve the tax benefit:
Option 1: Cash Purchase
The simplest option. You pay for the system outright, you own it, you claim the full Section 12B deduction. The R405,000 tax saving on a R1.5M system effectively means the real cash outlay is R1,095,000.
Option 2: Asset Finance / Instalment Sale
With an instalment sale or asset finance arrangement, ownership transfers to you from day one (or on a deferred basis depending on the agreement structure). In many cases, you can claim the Section 12B deduction even while paying off the asset. The tax saving in year one can cover a significant portion of your annual repayments.
Example: A R1.5M system financed over 5 years at prime + 1%:
- Monthly repayment: ~R32,000
- Year 1 tax saving (Section 12B): R405,000
- Tax saving covers ~13 months of repayments
Option 3: Power Purchase Agreement (PPA)
Under a PPA, a third party owns and maintains the solar system on your roof. You pay only for the electricity it produces — typically at a rate 20-30% below your current tariff. However, because you don't own the asset, you cannot claim Section 12B. The PPA provider claims the deduction instead, which is partly how they fund the lower tariff.
A PPA is still an excellent option for businesses that want savings without capital outlay or tax complexity. But if maximising the Section 12B benefit is your priority, ownership (via cash or asset finance) is the way to go.
Option 4: Solar + Battery Combination
A solar-plus-battery system protects you against load shedding while delivering Section 12B benefits on the solar components. Battery storage may qualify under separate tax provisions — your tax advisor can confirm the treatment for your specific installation.
Which option is right for you?
| Criteria | Cash Purchase | Asset Finance | PPA |
|---|---|---|---|
| Section 12B deduction | Yes (full) | Yes (in most structures) | No (owner claims it) |
| Capital outlay | High | Low (monthly payments) | None |
| Ownership | Immediate | On completion of payments | Third party |
| Maintenance responsibility | You | You | PPA provider |
| Best for | Businesses with available capital and taxable income | Businesses wanting to preserve cash but claim the deduction | Businesses wanting zero risk and zero capital outlay |
Frequently Asked Questions About Section 12B
Q: Is Section 12B still available in 2025/2026? Yes. Section 12B remains an active provision of the Income Tax Act with no announced expiry date. The provision that expired on 28 February 2025 was Section 12BA (the enhanced 125% deduction). The standard 100% first-year deduction under Section 12B continues to apply.
Q: Can I claim Section 12B if I'm a sole proprietor or in a partnership? Section 12B applies to any taxpayer carrying on a trade — this includes companies, close corporations, sole proprietors, and partnerships. The deduction is claimed against taxable income from the trade in which the solar asset is used. Individual taxpayers benefit at their marginal tax rate rather than the 27% corporate rate, which could mean a higher percentage saving depending on your tax bracket.
Q: What if my taxable income is lower than the deduction amount? If the Section 12B deduction creates or increases an assessed loss, normal assessed loss provisions apply. The loss can be carried forward to offset future taxable income (subject to current loss limitation rules). Speak to your tax advisor about how this applies to your specific situation — the benefit is not lost, only deferred.
Q: Does the system have to be installed on my own property? The system must be used in your trade. If you lease your business premises, you can still install solar and claim Section 12B, provided you own the system and it's used for your business operations. Check your lease agreement for any clauses relating to improvements or fixtures.
Q: How do I know what size system to install? System size depends on your electricity consumption, roof space, budget, and energy goals. A 100 kWp system suits a medium-sized commercial premises; larger warehouses or factories may benefit from 250 kWp to 999 kWp. Gentricity's free assessment includes a detailed analysis of your consumption data and a recommendation tailored to your building.
Q: Can I add batteries to my system and still claim Section 12B? The Section 12B allowance specifically covers PV solar energy generation equipment. Battery storage may qualify under different provisions of the Income Tax Act depending on the configuration and use. We recommend discussing battery tax treatment with your tax practitioner. Gentricity provides separate line items for solar and battery components on all invoices to simplify this process.