1. Enter your assumptions
Use annual figures. For employer NPS, enter only the amount you are actually eligible to claim under the applicable rules and payroll records.
2. Read the result
The engine keeps deductions, rebate, cess and payments separate so you can see what drives the final number.
3. What is driving the result?
| Stage | What the engine does |
|---|---|
| Gross income | Salary/pension + other ordinary-rate income entered. |
| Standard deduction | Up to ₹75,000 against salary/pension income in this model. |
| Eligible employer NPS | Deducted only when the user enters the eligible amount. |
| Taxable income | Gross income less modelled deductions, floored at zero. |
| Slab tax | Uses the Tax Year 2026-27 ordinary-income slab structure. |
| Rebate / marginal relief | Models resident 87A relief up to ₹12 lakh taxable income and marginal relief for income marginally above the threshold. |
| Cess | 4% of tax after rebate/marginal relief in this model. |
| Payments | TDS and advance tax already entered are compared with estimated total tax. |
Important: This is a planning model, not an ITR filing engine. The Income Tax Department notes that Tax Year 2026-27 uses the Income Tax Act, 2025, while earlier years remain governed by the transition rules. Special-rate income, surcharge, business/profession complexities and individual facts can materially change the calculation.