Combined Tax-Deduction Calculator for FY 2026-27

Adding legacy Section 80 limits without validation overstates the claim.

Legal or Computational Framework

The tool should show accepted and rejected inputs, section mapping, gross-total-income cap and tax saved. Fixed, expenditure-based, income-linked and employer deductions need separate engines.

Core working: Taxpayer profile → regime → eligibility → actual amount → statutory cap → shared cap → gross-total-income cap → tax recomputation.

Why the result is fact-sensitive

The same keyword can produce different answers because residence, age, employment terms, service period, contribution payer, deposit type, income composition, tax regime and documentation differ. Payroll terminology is not always statutory terminology. A calculator must therefore state the legal definition used for salary, wages, contribution, deposit, deduction or exemption.

Step-by-step method

1. Identify the governing tax year and statute.
2. Confirm taxpayer category, residence and regime.
3. Classify every input under the correct current provision.
4. Apply actual-amount, statutory and shared ceilings in order.
5. Recompute tax, rebate, surcharge, marginal relief and cess.
6. Reconcile official statements and retain an audit trail.

Worked example

Inputs of ₹2 lakh investment, ₹50,000 own NPS, ₹1.4 lakh employer NPS and ₹60,000 interest cannot be accepted through one deduction field.

The example is an audit model, not a substitute for the taxpayer's records. Change one input—such as residence, regime, payment date, disability band, contribution payer, state, service period or income type—and the answer may change.

Decision checks before claiming or calculating

1. Correct period: confirm whether the question concerns AY 2026–27 or Tax Year 2026–27.
2. Correct statute: cite the 2025 Act for income from 1 April 2026; use the Social Security Code for current gratuity entitlement.
3. Correct person: establish who paid, earned, received or is legally eligible.
4. Correct base: use statutory salary, wages, interest, contribution or adjusted income—not a convenient payroll label.
5. Correct ceiling: apply actual-amount, shared, lifetime and gross-total-income ceilings in the right sequence.
6. Correct evidence: reconcile the result to official statements, certificates, payroll and bank records.

What Generic Pages Miss

Practical Documentation Checklist

• provision ledger
• payment proofs
• gross-total-income computation
• regime comparison
• payroll declaration
• rejection audit trail

See the broader Income-tax Act 2025 study guide hub for related rules and calculators on this topic.

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