Two ways to use this calculator
Forward mode answers the appraisal-letter question: you know your old CTC and your new CTC, and want the hike percentage — plus what actually changes in your bank account each month. Reverse mode answers the negotiation question: you know your current CTC and a percentage ("we can offer a 30% hike"), and want the new CTC and the new monthly in-hand that percentage translates to.
The formulas are simple. Forward: hike % = (new CTC − old CTC) ÷ old CTC × 100. Reverse: new CTC = old CTC × (1 + hike% ÷ 100). What makes this calculator more useful than the arithmetic is the second half: it runs both CTCs through the same tax engine as our in-hand salary calculator — income tax for FY 2026-27 (including the §87A rebate and marginal relief), employee PF, and state professional tax — and shows the change in monthly in-hand, which is the number a hike is really about.
The headline hike is not your in-hand hike
A percentage applied to CTC never lands as the same percentage in your bank account, and during appraisal season this gap surprises almost everyone. Three mechanics cause it:
- Slab tax on the increment. Every rupee of the hike is taxed at your highest marginal rate. If you were at a 20% marginal slab, a fifth of the raw increment goes to tax before it reaches you — while your pre-hike salary keeps its lower average rate.
- The ₹12 lakh rebate cliff (new regime). Up to ₹12,00,000 of taxable income, the §87A rebate makes tax zero. A hike that pushes taxable income past this line converts a zero-tax salary into a taxed one — softened by marginal relief just above the line, but the effect on a larger hike is stark. This is the single biggest reason an in-hand increase can lag the CTC percentage by several points.
- Flat deductions stay flat. PF on the ₹15,000 statutory ceiling is ₹1,800 a month whether you earn ₹8 lakh or ₹80 lakh, and professional tax is constitutionally capped at ₹2,500 a year. These do not eat into the increment — which is why, at lower CTCs where tax is zero on both sides, the in-hand hike can actually come out slightly higher than the CTC hike.
Worked example: a 25% hike from ₹12 lakh to ₹15 lakh (FY 2026-27)
Take the calculator's defaults — new regime, Karnataka, metro, 40% basic, PF on the statutory ceiling. At ₹12,00,000 CTC, taxable income after the ₹75,000 standard deduction stays under ₹12 lakh, the §87A rebate applies, and income tax is ₹0: monthly in-hand is ₹94,277. At ₹15,00,000 CTC, taxable income is ₹13,74,554 — past the rebate limit and beyond marginal-relief range — so the year's income tax is ₹89,630. Monthly in-hand becomes ₹1,11,327.
The comparison: CTC rose 25%, but monthly in-hand rose ₹17,050 on ₹94,277 — 18.1%. About ₹7,470 of the ₹25,000 headline monthly increment went to income tax. The hike is still an extra ₹2,04,601 a year in hand; it is simply a smaller percentage than the offer letter suggests, and knowing the real figure before an appraisal discussion means the conversation happens in in-hand terms, not CTC optics.
Reading a hike during appraisal season
A few structural details change what a hike is worth, all visible in the revised compensation annexure. First, check whether the increment applies to fixed CTC or total CTC — a 20% hike where all growth sits in variable pay guarantees nothing month to month. Second, check whether the basic percentage changed: employers sometimes hold basic flat and grow only allowances, which caps growth in PF, gratuity accrual, and HRA. Third, when comparing an internal hike against an outside offer, run both through the same in-hand math — our CTC offer comparison tool does this side by side with per-offer state and regime settings, since a move from Bengaluru to a no-professional-tax state like Delhi shifts the numbers too.
Like every tool on this site, this calculator runs entirely in your browser — your current and offered salary figures are never transmitted, stored, or logged anywhere. Nothing here is tax or financial advice: the tool shows what the arithmetic and the FY 2026-27 rules produce for the numbers you enter, so that the decision you make is an informed one.