Old vs New Tax Regime: Which Should You Pick?

The Old Regime has higher slab rates but allows deductions — 80C, HRA, home loan interest, standard deduction, and more. The New Regime has lower slab rates but strips away nearly all deductions, aiming for simplicity. One question decides this for most people: how many deductions do you actually claim?

Law update: Under the Income-tax Act, 2025 (effective 1 April 2026), Section 115BAC — which governs the New Regime — has been renumbered under the reorganised Act. The New Regime remains the default, and the rates and rules described below are unaffected.

A Worked Comparison

Take two people with the same ₹12 lakh salary, but very different deduction profiles:

Profile	Deduction Situation	Regime That Usually Wins
Person A — heavy deductions	Has a home loan, claims full 80C (₹1.5L), HRA, and standard deduction — totaling roughly ₹4-5 lakh in deductions	Old Regime
Person B — few deductions	No home loan, minimal 80C investments, lives with family (no HRA claim) — deductions add up to very little	New Regime

There's a rough "break-even" deduction amount — below it, the New Regime's lower rates win; above it, the Old Regime's deductions win. This break-even shifts depending on your income level, so a quick calculation each year is worth doing rather than assuming it stays fixed.

Why the Break-Even Point Isn't Fixed

The break-even deduction amount moves because it depends on the gap between the two regimes' slab rates at your specific income level, not on deductions alone. Someone earning ₹8 lakh and someone earning ₹18 lakh can have very different break-even points, even with identical deduction amounts — which is exactly why a generic rule of thumb ("claim over ₹3.75 lakh in deductions, pick Old Regime") can mislead people whose income sits well above or below the income level that rule was calculated for. Running the actual numbers for your specific income and deduction combination avoids this trap.

Working Through the Numbers

Take Person A from the example above: ₹12 lakh salary with roughly ₹4.5 lakh in total deductions (80C, home loan interest, HRA, standard deduction combined). Under the Old Regime, taxable income drops to roughly ₹7.5 lakh after deductions, and tax is calculated on that lower figure using the Old Regime's higher slab rates. Under the New Regime, the same ₹12 lakh is taxed close to its full amount (minus only the standard deduction, which still applies), but at the New Regime's lower rates. For Person A, the deduction-driven reduction in taxable income under the Old Regime typically outweighs the benefit of the New Regime's lower rates, since ₹4.5 lakh is a substantial chunk to remove from taxable income entirely.

Now take Person B: same ₹12 lakh salary, but only around ₹75,000 in deductions (a small 80C investment, no home loan, no HRA claim). Under the Old Regime, taxable income only drops to about ₹11.25 lakh — a much smaller reduction — while still being taxed at the Old Regime's higher rates. Under the New Regime, the full ₹12 lakh (minus standard deduction) gets taxed at lower rates. Here, the New Regime usually wins, since the small deduction amount isn't enough to offset the rate difference.

A Simple Decision Checklist

Step 1: Add up your likely deductions — 80C investments, home loan interest, HRA, health insurance under 80D — total them all up for the year. Step 2: Calculate tax under both regimes, using a tax calculator (or your CA) to work out your actual liability under the Old Regime (with deductions applied) and the New Regime (without them). Step 3: Pick the lower number — whichever regime results in less tax owed is the one to declare, since there's no loyalty bonus for sticking with last year's choice. Step 4: Redo it next year — a new home loan, a salary jump, or paying off a loan can all flip which regime is better, so this isn't a one-time decision.

Life Events That Can Flip Your Better Regime

Taking a new home loan: Home loan interest deduction can be substantial, often shifting the balance toward the Old Regime for someone who previously had few deductions.
Paying off an existing home loan: Once the loan is closed, that deduction disappears — the New Regime can suddenly become the better option the following year.
A significant salary increase: As income rises, the relative value of a fixed deduction amount shrinks compared to the New Regime's lower rates, which can shift the break-even point.
Moving from a rented home to owning, or vice versa: HRA claims disappear once you stop paying rent, directly reducing Old Regime deductions.
Starting or stopping health insurance premiums (80D): A new family health policy adds a deduction only usable under the Old Regime, while letting an old policy lapse removes it.

Beyond Just the Numbers: Practical Considerations

The tax calculation isn't the only factor worth weighing. The Old Regime requires keeping documentation for every deduction claimed — rent receipts for HRA, loan interest certificates, investment proofs for 80C — and organizing all of it before filing. The New Regime, by contrast, needs almost none of this paperwork. For someone whose Old Regime savings over the New Regime are marginal, the reduced complexity of the New Regime can be worth more than a small monetary difference, especially if managing the documentation itself is a genuine hassle each year.

Common Mistakes to Avoid

Assuming last year's choice still applies: Since income and deductions both change year to year, defaulting to a previous choice without recalculating can mean overpaying tax unnecessarily.
Following a generic rule of thumb without checking your own numbers: A break-even deduction figure calculated for a different income level may not apply to your specific situation.
Not informing the employer of regime choice: Skipping this means TDS gets deducted under the default regime through the year, which can create a mismatch to sort out at return-filing time even if you ultimately choose differently.
Forgetting deductions still allowed under the New Regime: A few deductions, like the standard deduction, remain available even under the New Regime — leaving them out of the comparison understates the New Regime's actual benefit.
Ignoring the paperwork cost of the Old Regime: Even when the Old Regime saves slightly more tax, the added documentation burden is worth factoring into the decision, not just the final tax number.

Key Takeaway: Large deduction claims usually favor the Old Regime; minimal claims usually favor the New Regime. The exact break-even point shifts with your income level, so a generic rule of thumb can mislead — run the actual numbers for your situation. Salaried taxpayers can typically switch their choice every year, so treat this as an annual calculation rather than a one-time decision, especially after a life event like a new home loan or a paid-off one, and factor in the paperwork burden of the Old Regime alongside the pure tax math.

Frequently Asked Questions

Which regime is the default now if I don't choose?

The New Regime is currently the default — if you want the Old Regime, you typically need to actively opt for it, either with your employer at the start of the year or while filing your return.

Can business owners switch regimes as freely as salaried employees?

No — those with business or professional income face restrictions and generally can't switch back and forth every year as freely as salaried individuals can. Check the specific rules for your situation before assuming annual flexibility.

What deductions are still allowed under the New Regime?

A few deductions remain available even under the New Regime, such as the standard deduction for salaried individuals and employer's contribution to NPS. Most other popular deductions (80C, HRA, home loan interest) are not available.

Should I tell my employer which regime I'm choosing?

Yes — your employer needs to know which regime to use for calculating TDS on your salary through the year. You can still choose a different regime later while filing your actual return, but declaring your intent upfront avoids a large TDS mismatch.

Is there a single deduction amount that always decides which regime is better?

No — the break-even deduction amount shifts based on your income level, so a fixed rule of thumb from one income bracket may not apply to yours. It's worth calculating both regimes directly using your own numbers rather than relying on a generic threshold.

Does the extra paperwork of the Old Regime matter if the tax savings are small?

It's worth considering — if the Old Regime only saves a small amount over the New Regime, the time and effort spent gathering rent receipts, loan certificates, and investment proofs may not be worth it for some taxpayers.