Quick Facts
What MAT and MAT credit are
Minimum Alternate Tax (MAT) is a backstop tax provision in the Income Tax Act 1961 that ensures companies pay at least a minimum tax even when their regular taxable income is reduced through deductions, exemptions, or accelerated depreciation. MAT applies at 15% of book profit (plus surcharge and cess), giving an effective rate of approximately 15.6% to 17.5%.
When a company’s MAT exceeds its regular corporate tax for a year, the company pays MAT. The excess of MAT over regular tax becomes MAT credit, available for carry-forward and set-off against regular tax in future years.
For solar investors, MAT and MAT credit are most relevant when claiming Accelerated Depreciation (AD). AD significantly reduces taxable income in early years of the solar project, often dropping regular tax below MAT. The MAT excess accrues as credit, recoverable in later years when AD benefits taper off and regular tax exceeds MAT again.
How MAT works in solar context
Consider a company with a solar project. In the year of solar commissioning:
Book profit: Rs 5 crore (calculated per accounting standards).
Regular taxable income after Rs 33 lakh AD claim: Rs 4.67 crore.
Regular corporate tax at 30%: Rs 1.40 crore.
MAT at 15% of book profit: Rs 75 lakh.
Since regular tax (Rs 1.40 crore) exceeds MAT (Rs 75 lakh), the company pays regular tax. AD has reduced regular tax but not below MAT.
If the company’s profile were different, say with book profit of Rs 2 crore:
Regular taxable income after AD: Rs 1.67 crore.
Regular tax at 30%: Rs 50 lakh.
MAT at 15% of book profit: Rs 30 lakh.
Regular tax still exceeds MAT, so the company pays Rs 50 lakh.
Now consider a smaller company with book profit of Rs 1 crore where AD on a large solar project produces significant deduction:
Book profit: Rs 1 crore.
AD on solar plant: Rs 33 lakh.
Regular taxable income: Rs 67 lakh.
Regular tax at 30%: Rs 20.1 lakh.
MAT at 15% of book profit: Rs 15 lakh.
Regular tax is still above MAT. AD’s benefit is fully realised.
The scenario where MAT exceeds regular tax typically arises when AD or other deductions exceed book profit, making regular taxable income very low or negative.
When MAT credit accrues
MAT credit accrues when MAT exceeds regular tax in a given year. The exact MAT credit equals MAT paid minus the regular tax that would have been paid in the absence of MAT.
For a small company with book profit of Rs 50 lakh and AD claim of Rs 33 lakh:
Book profit: Rs 50 lakh.
Regular taxable income after AD: Rs 17 lakh.
Regular tax at 30%: Rs 5.1 lakh.
MAT at 15% of book profit: Rs 7.5 lakh.
MAT payable: Rs 7.5 lakh (since MAT exceeds regular tax).
MAT credit accrued: Rs 7.5 lakh minus Rs 5.1 lakh = Rs 2.4 lakh.
This credit is available for the next 15 years.
How MAT credit is utilised
MAT credit is utilised in subsequent years when regular tax exceeds MAT. The credit can be set off up to the amount by which regular tax exceeds MAT in that year.
Continuing the previous example, suppose in year 2 the company’s profile is:
Book profit: Rs 60 lakh.
Regular taxable income (no AD this year): Rs 60 lakh.
Regular tax at 30%: Rs 18 lakh.
MAT at 15% of book profit: Rs 9 lakh.
Regular tax exceeds MAT by Rs 9 lakh. The company can use up to Rs 9 lakh of MAT credit to reduce regular tax.
If accumulated MAT credit is Rs 2.4 lakh (from year 1), the full amount is used, and the company pays Rs 18 lakh minus Rs 2.4 lakh = Rs 15.6 lakh in regular tax.
The MAT credit is fully consumed in year 2.
MAT credit period
MAT credit is valid for 15 years from the year MAT was paid. Unused MAT credit at the end of 15 years lapses.
For most established companies, 15 years is sufficient to fully recover MAT credit. New companies or those with cyclical profits may have unused credit lapse.
MAT and the new corporate tax regime
The Finance Act 2019 introduced the lower corporate tax rate under Section 115BAA (22%) and Section 115BAB (15% for new manufacturing). Companies opting for these regimes are not subject to MAT. They lose existing MAT credit upon opting in.
This creates a strategic choice for companies:
Old regime: 30% corporate tax with AD benefit and potential MAT credit.
New regime: 22% corporate tax without additional depreciation and without MAT.
For solar-investing companies, the trade-off depends on their overall tax profile and how much of their income comes from operations that benefit from AD.
MAT credit in solar project financial models
Lender’s project finance models typically:
Project regular tax and MAT separately for each year of the solar plant’s operation.
Apply AD in early years, leading to potential MAT in those years.
Track MAT credit accumulation and utilisation over the project life.
Compute the post-tax cash flow accounting for both regular tax and MAT.
The result is a more accurate post-tax IRR calculation that reflects the real tax burden through the project’s life.
For a 25-year solar project, MAT credit typically gets fully utilised by year 5 to 10, with the AD benefit largely intact net of MAT timing.
Common mistakes with MAT credit
Forgetting MAT applies. Companies focused on regular tax planning sometimes overlook MAT.
Assuming MAT credit is recoverable in full. The 15-year window can be insufficient for some companies.
Not modelling MAT credit utilisation timing in solar financial models. The cash impact differs by year.
Mixing MAT credit with regular deductions. They are separate provisions.
Opting into Section 115BAA without considering MAT credit lapse. Existing MAT credit is lost.
Best practices
Run pre-investment tax modelling for solar that includes both AD and MAT impacts.
Track MAT credit balance annually as part of tax planning.
For companies considering Section 115BAA, evaluate the trade-off between lower regular tax and lost MAT credit plus AD benefits.
Engage a chartered accountant for the specific company’s situation. The interaction between AD, MAT, and tax regimes is complex and company-specific.
Document AD claims and MAT calculations carefully for tax authority scrutiny.
Standards and references
MAT is governed by Section 115JB of the Income Tax Act 1961. MAT credit is governed by Section 115JAA. The new corporate tax regime is under Section 115BAA (introduced by Finance Act 2019) and Section 115BAB (new manufacturing). CBDT issues circulars and notifications clarifying provisions.
Related glossary terms
- Accelerated Depreciation
- CAPEX Model
- OPEX Model
- Power Purchase Agreement
- IRR
- GST Input Credit
- Payback Period
Key takeaways
MAT Credit is the carry-forward tax credit available when a company pays Minimum Alternate Tax in excess of regular corporate tax. For solar investors claiming Accelerated Depreciation, MAT may exceed regular tax in early project years, leading to MAT credit accrual. The credit is recoverable for up to 15 years against future regular tax. The interaction between AD, MAT, and the new corporate tax regime requires careful tax planning, and chartered accountant guidance is essential for company-specific decisions.