You are not "in" a tax bracket — and the difference is worth knowing
The most common tax misunderstanding is that a raise can push you into a bracket and leave you worse off. Slabs are marginal, and here is what that means.
"I turned down the raise because it would push me into the next bracket." This is one of the most persistent and expensive misunderstandings in personal finance, and it is based on a misreading of how slabs work.
Slabs are marginal, not total
A tax slab applies only to the income within that band, not to your whole income. Crossing into a higher slab taxes the crossing amount at the higher rate. Everything below is untouched.
Take an income where the slabs are 0% up to ₹3 lakh, 5% from ₹3 to ₹7 lakh, and 10% from ₹7 to ₹10 lakh. On ₹8 lakh:
| Band | Amount | Rate | Tax |
|---|---|---|---|
| Up to ₹3,00,000 | ₹3,00,000 | 0% | ₹0 |
| ₹3,00,001 to ₹7,00,000 | ₹4,00,000 | 5% | ₹20,000 |
| ₹7,00,001 to ₹8,00,000 | ₹1,00,000 | 10% | ₹10,000 |
| ₹30,000 |
The effective rate is 3.75%, not 10%. Only that last ₹1 lakh saw 10%.
Why more income is always more money
Because slabs are marginal, an extra rupee earned is never worth less than zero after tax. At a 30% marginal rate you keep 70 paise of it. The raise is always worth taking.
The one genuine cliff
There is an exception, and it is the rebate. Where a rebate makes tax zero below a threshold and disappears above it, earning ₹1 more can cost several thousand in tax. This is a real cliff — but it exists at one specific income level, not at every slab boundary.
Marginal relief provisions usually blunt it. It is still the only place the "raise made me worse off" story has ever been true.
Surcharge stacks on top
Above certain income levels a surcharge applies as a percentage of the tax, not of income, and cess applies on top of that. This is why the headline top rate and the actual top rate differ, and why the effective marginal rate at high incomes is higher than any slab table shows.
Work out your own
What to do with this
Know your marginal rate. It is the only number that tells you what a deduction is worth: a ₹1,50,000 deduction saves ₹45,000 at a 30% marginal rate and ₹7,500 at 5%. The same investment is a very different proposition in those two cases, and tax-saving products are sold as though everyone is in the top band.
Open the income tax calculator
Where these figures come from
- Income Tax Department, Government of India — Slabs, deductions, exemption limits and holding periods
Published by FinClamp. This guide is information, not financial advice — see the disclaimer.