Most tax-regime mistakes happen months before the ITR is filed. The employee ticks old or new regime in payroll, gives incomplete proofs, changes jobs, forgets employer NPS or misses rent evidence — and the mismatch appears only after Form 16/Form 130 is issued.
Payroll declarations help employers estimate annual tax and deduct TDS during the year. The final return still belongs to the taxpayer, but bad payroll inputs can create monthly TDS gaps and year-end surprises.
| Mistake | Result | Fix |
|---|---|---|
| Choosing old regime but not submitting proofs | Employer may disallow claims in payroll. | Set proof deadline and upload complete Form 12BB file. |
| Choosing new regime despite large HRA/home-loan deductions | Potentially higher tax. | Run official calculator before declaration. |
| Ignoring employer NPS | New regime benefit may be understated. | Check salary structure and NPS deduction line. |
| Declaring same deduction to two employers | TDS shortfall after job change. | Consolidate annual proof file. |
| Using investment plans instead of actual payments | Proof mismatch at year-end. | Submit paid receipts, not intentions. |
HR teams should keep a monthly exception report: employees with old regime but missing proofs, employees who switched regime in payroll, employees who joined mid-year, employees with high HRA, and employees with employer NPS or large deductions.
This Finin2min article is drafted only from official/government source material. Re-check the live source before publishing if the law, form, threshold, section mapping or portal workflow has been updated.