Honestly, for your salary range this is actually not as clear-cut as people are making it sound on Twitter and YouTube.
Let me break it down simply. Under the new regime, with ₹12L basic exemption and the standard deduction of ₹75,000, your effective tax on ₹11.5L CTC comes out quite low — possibly zero or near-zero depending on your exact structure. That part is real, not hype.
But here's what most people are getting wrong right now — they're forgetting that the ₹12L exemption only applies if your total income is at or below ₹12L. If your CTC is ₹11.5L but you have any other income — interest, freelance, anything — you could cross that threshold and the math changes completely.
Now for your specific situation. You're claiming HRA on ₹18k rent, that's roughly ₹1.5L per year in exemption if you're in a metro. Add ₹1.5L from 80C (PPF + ELSS). Add maybe ₹25k from 80D for parents' insurance. Plus standard deduction of ₹50k in old regime. That's easily ₹3.75L in deductions bringing your taxable income down to around ₹7.75L in old regime — and you'd pay roughly ₹75,000-80,000 in tax there.
In new regime, with ₹75k standard deduction, taxable income is ₹10.75L. Tax comes to around ₹61,000-65,000 at new slab rates.
So new regime likely wins for you by about ₹10,000-15,000 annually. Not a massive difference but real money.
However — and this is important — if you're genuinely investing in ELSS through SIPs and PPF regularly, those habits matter beyond just tax saving. Don't stop them just because you switched regimes. Keep the investments, just stop treating them as tax tools.
One more thing: once you submit Form 10-IEA to opt out of the new regime back to old, you can switch every year if you're salaried. Your payroll team may not tell you this clearly. You're not locked in forever.
My recommendation: go with new regime this year given your numbers, but run the exact calculation on the income tax department's own calculator at incometax.gov.in before finalising. Takes 10 minutes and removes all guesswork.