TDS is mechanical, deadline-driven and unforgiving, which makes it the compliance area where small process gaps generate the most predictable damage: interest, late fees, penalties, and disallowance of the very expenses on which tax was not deducted. The mistakes below account for most of the TDS trouble we see in practice.
Mistake 1: Not deducting at all
The most expensive error is treating a payment as outside TDS when it is not. Common blind spots:
- Payments to contractors and professionals below an assumed threshold that was actually crossed during the year
- Rent, commission and interest payments made by businesses that never set up TDS processes
- Payments to non-residents, where the deduction rules are stricter and the consequences of missing them severe
- Year-end provisions for expenses, on which TDS is also required, not just on actual payments
The consequence is not just interest, the expense itself can be disallowed in the tax computation, turning a process lapse into real tax.
Mistake 2: Deducting but depositing late
TDS deducted is government money held in trust. Depositing it late attracts interest at rates that compound badly, and long delays carry prosecution risk. The fix is procedural: a fixed monthly calendar entry for the deposit date, owned by a named person, with the payment made a few days early rather than on the last day.
Mistake 3: Filing returns late or with errors
The quarterly TDS return is where deductions become credits for the people you paid. Late filing attracts a per-day fee; errors create mismatches that surface in your vendors' and employees' records.
- Verify PANs before deducting, a wrong or inoperative PAN changes the deduction rate and breaks the credit chain
- Reconcile the return against the ledger before filing, not after a notice
- Issue TDS certificates on time; counterparties increasingly chase them, and rightly so
Mistake 4: Ignoring the department's view of your filings
The department's records (what your returns produced) are visible and should be reviewed quarterly. Defaults appear there before notices arrive: short deduction, short payment, interest pending. A quarterly fifteen-minute review of the default summary catches problems while they are small and correctable.
Mistake 5: Treating employee TDS as payroll software's problem
Salary TDS depends on declarations, regime choices and proofs that change during the year. Recurring issues:
- Investment declarations accepted at face value in April and never verified against proofs before the final quarter
- Joiners and leavers whose prior employment income is not consolidated, producing year-end shortfalls
- Perquisites and reimbursements taxed incorrectly because nobody mapped them to the rules
A mid-year true-up in October or November, plus proof verification before the final quarter, prevents the March scramble and the employee complaints that follow it.
The control set that prevents all five
- A payment-type map: every recurring payment category in the business, its TDS treatment, and the section it falls under, reviewed annually
- A monthly calendar for deposits and a quarterly one for returns, with named owners
- PAN verification at vendor onboarding
- Quarterly reconciliation of ledger, returns and the department's default summary
None of this is sophisticated. TDS compliance is one of the few areas where diligence alone (applied on time) eliminates virtually all of the risk.