The tax deductions Indian businesses leave on the table, and why your CA isn't claiming them

Here is an uncomfortable truth about missed tax deductions: your CA almost certainly knows every rule in this post. The deductions get missed anyway, because a deduction is not a rule, it is a rule plus evidence, and the evidence lives with you. Your CA cannot claim the business share of your home electricity bill if they have never seen it, and they will not disallow-proof an expense they only met as a bank statement line called “UPI/DR/402398”.

So read this as two lists in one: deductions worth money, and the evidence trail each one needs. The second list is the reason the first goes unclaimed.

1. The business share of things you already pay for

Section 37 allows any expenditure laid out wholly and exclusively for the business. That includes proportions of mixed-use costs, and founders routinely pay these personally and never route them through the books:

The business share of rent and electricity when you work from home. Your phone and internet bills. The depreciation and running costs of a personally owned laptop or vehicle used for the business, in proportion to that use.

None of this is aggressive. What kills it is documentation: claim a defensible proportion, keep the underlying bills, and where an asset is used by the company, get it into the books properly. A reasonable, consistent, evidenced claim survives scrutiny; a round number invented in March does not.

2. Pre-incorporation and preliminary expenses

Money spent before the company existed (market research, legal drafting, registration costs, that consultant you paid from savings) does not have to vanish. Section 35D lets a company amortise preliminary expenses over five years, within limits linked to project cost or capital employed. The catch is entirely evidentiary: the invoices need to exist, name the right things, and be brought into the company’s books deliberately. Founders who kept receipts claim it; founders who paid from a personal UPI and moved on fund the exchequer.

3. Section 80JJAA: the 190% deduction on new hires that almost nobody files

If your company hires new employees with emoluments up to Rs 25,000 a month, Section 80JJAA gives you an extra deduction of 30% of their cost, every year for three years. Salary you were paying anyway, deducted 1.9 times over. It survives even under the concessional corporate tax regime, which stripped most other incentives.

Why is it rare in practice? Because it has fiddly conditions (the employee must work 240 days in the year, must be on EPF, and the claim needs Form 10DA from an accountant filed on time) and because it requires whoever files your return to know your month-by-month headcount story. A CA who receives your trial balance in September cannot reconstruct that. Payroll data has to flow to the tax filer with intent, before the deadline, not after it.

4. Section 43B(h): the deduction you lose by paying MSMEs late

This one works in reverse: it is a deduction you already had that silently disappears. Pay a registered micro or small enterprise later than the time allowed (45 days with a written agreement), and the expense is disallowed in the year you incurred it, allowed only in the year you actually pay. In the meantime you pay tax on profit you spent.

The defence is operational, not intellectual: know which of your vendors are Udyam-registered, and watch the ageing on exactly those payables before year end. A books system that tracks vendor MSME status does this automatically; a shoebox of invoices does not.

5. Input credit is a deduction too, and it dies the same death

GST input tax credit is not an income tax item, but it is the same economics: money recovered against documents. Section 16 makes possession of the tax invoice a condition of credit, and credit only flows when your supplier has filed their GSTR-1 so the invoice shows up in your GSTR-2B. Every purchase invoice that never made it from a founder’s inbox to the books is input credit burned, and every unreconciled gap between your purchase register and 2B is either credit unclaimed or credit at risk. Businesses that reconcile monthly recover it; businesses that reconcile at audit time discover it expired.

6. Advance tax, the anti-deduction

Not a deduction, but it belongs on any list of money left on the table: interest under Sections 234B and 234C runs at 1% a month when advance tax instalments are missed, and it is invisible until assessment. It is pure deadweight, avoidable entirely by projecting profit quarterly, which requires books that are current enough to project from. Books written up once a year cannot warn you in December.

The pattern, and what to do with it

Look back at the list. Home office needs bills captured monthly. 35D needs receipts kept before day zero. 80JJAA needs payroll data reaching the filer in time. 43B(h) needs vendor registry data in the books. ITC needs invoice possession and monthly reconciliation. Advance tax needs current books.

Not one of these fails at the level of tax knowledge. All of them fail at the pipeline between your daily operations and whoever files your returns. This is why we built CompanyStack around continuous books and document capture rather than a filing-season fire drill: a deduction claimed is mostly a document that arrived on time.

This post is general information, not tax advice for your situation. Thresholds and conditions change with each Finance Act; confirm the current ones before acting, ideally with someone who has your evidence in front of them.