You switched jobs this year. Here's the TDS gap nobody told you about.
"I changed jobs in October. Will I get a refund or owe tax?"
TL;DR — The 60-second version
You switched jobs in September. Employer 1 deducted TDS on their salary thinking it was your full-year income. Employer 2 did the same for their half-year salary. Combined TDS is much lower than the actual tax on your total annual income. When you file your ITR, instead of a refund, you'll see a demand. And if the demand exceeds Rs. 10,000, you'll owe interest too. This happens to every job switcher who doesn't submit Form 12B to their new employer.
Before changing jobs, submit Form 12B to your new employer with your previous employer's name, TDS details, and salary. This tells the new employer: "I already earned this much and paid this much TDS — adjust my TDS accordingly." The new employer then calculates correct TDS on their incremental salary, not on an annualized guess. When you file your ITR, your total TDS matches your total income, and you get the refund you deserve — no demand, no interest.
We calculate your actual tax liability on combined salary, determine the true refund or demand, explain why you got the demand (if you missed Form 12B), file your ITR correctly, and help you claim any refund owed. Talk to a TaxSavvy CA before filing — don't get caught by the job-switch tax trap.
Stage 01Fact of the Case
Arjun worked at Company A from April to September 2025, earning Rs. 8 lakhs. Company A deducted TDS of Rs. 48,000 (calculated on annualized Rs. 16 lakh guess). In October, he joined Company B at a higher salary. Company B paid him Rs. 10 lakhs from October to March 2026 and deducted TDS of Rs. 60,000 (again, calculated on annualized Rs. 20 lakh guess). His total income for the year: Rs. 18 lakhs. Total TDS paid: Rs. 1,08,000. But actual tax on Rs. 18 lakhs is Rs. 1,44,750. When he filed his ITR in July 2026, he expected a refund (like he always got with one employer). Instead, he saw a tax demand of Rs. 36,750 — plus interest notices for late payment. He was shocked. He hadn't submitted Form 12B to Company B, and nobody had told him it was important. Now he's confused: Why a demand instead of refund? Can he fix this? Will he have to pay interest?
Stage 02Applicable Laws & Provisions
Section 192
Employer Deduction of TDS on Salary
An employer is required to deduct TDS on salary at the prescribed rates. The employer has no visibility into salary earned from other employers. Each employer calculates TDS independently based on salary they pay, often annualizing it. This can result in under-deduction if the employee has multiple employers or salary from other sources. The employee is responsible for declaring total income in their ITR.
Form 12B
Declaration of Previous Employment and TDS Details
An employee who changes jobs must submit Form 12B to their new employer. Form 12B contains: previous employer's details, period of employment, salary earned, and TDS deducted by the previous employer. By providing this information, the new employer can calculate TDS correctly on their salary, accounting for income and TDS from the previous employer. Failure to submit Form 12B is a common mistake that leads to under-deduction of TDS by the new employer.
Section 234B
Interest on Under-Deduction of Advance Tax
Interest at 1% per month accrues if the advance tax paid (via TDS) falls short of 90% of the assessed tax liability. For a job switcher with a tax demand, if the combined TDS is less than 90% of the actual tax, interest under Section 234B applies from the first day of April (of the assessment year) until payment.
Section 234C
Interest for Deferment of Advance Tax Installments
If the shortfall in TDS exceeds Rs. 10,000, additional interest may apply under Section 234C for deferment of advance tax payment. This interest is calculated on the portion of tax shortfall exceeding Rs. 10,000. For job switchers with large income gaps between employers, this can result in significant interest liability.
Stage 03Mapping Laws to the Case
Here's why job switchers face tax demands, how Form 12B prevents it, and what interest you owe if you miss it.
| Fact | Section | Impact | Action |
|---|---|---|---|
| You switch jobs mid-year without submitting Form 12B | Section 192 | New employer deducts TDS on their salary thinking it's full-year income — under-deduction occurs | Submit Form 12B to new employer BEFORE they deduct TDS; this prevents the problem |
| Employer 1 deducts TDS on annualized salary, Employer 2 does the same | Section 192 | Combined TDS is lower than tax on actual combined income — creates demand in ITR | Calculate total income + total TDS; identify shortfall; file ITR with both Form 16s |
| Your combined TDS is Rs. 1,08,000 but actual tax is Rs. 1,44,750 | Section 192 + ITR | Tax demand of Rs. 36,750 shows up in your ITR; no refund, only demand | Pay the demand; interest will accrue if demand exceeds Rs. 10,000 |
| The tax shortfall is Rs. 36,750 (exceeds Rs. 10,000 threshold) | Section 234B + 234C | Interest at 1% per month from April 1 accrues on entire shortfall; additional interest on amount exceeding Rs. 10,000 | Interest compounds; paying immediately minimizes total interest liability |
| You file ITR 6 months late (January 2027 instead of July 2026) with tax demand | Section 234A | Interest at 1% per month on unpaid tax accrues from July 31 onwards | File ITR on time; even if expecting demand, timely filing limits interest damage |
| You submit Form 12B to new employer BEFORE they deduct TDS | Section 192 + Form 12B | New employer calculates correct TDS on incremental salary only — combined TDS matches total income | Refund claim possible; no demand, no interest; problem prevented entirely |
| You receive notice under Section 234B for interest on TDS shortfall | Section 234B | Interest calculated at 1% monthly from April 1; substantial amount if demand is large | Verify interest calculation; pay promptly to avoid additional penalties |
| You dispute the tax demand in your 143(1) intimation | Section 143(1) | Department shows both Form 16s, calculates combined income, demand is justified | Pay demand or file rectification if calculation error; don't ignore it |
⚠️ Additional risk found during mapping
⚠️ Ignoring a tax demand from a job switch doesn't make it go away. Interest at 1% per month compounds
monthly. A Rs. 36,750 demand can balloon to Rs. 40,000+ within a year due to interest alone. Form 12B
prevents this entirely. Always submit it to your new employer. If you didn't, file your ITR immediately
and pay the demand to stop interest accumulation.
Stage 04Conclusion
✅ Action Plan — in order
01
If you've already switched jobs: Immediately check whether you submitted Form 12B to the new employer.
Ask yourself: When you joined your new employer, did you give them Form 12B with your previous
employer's details? If you did, great — your new employer should have accounted for it. If you
didn't, you're in the situation where TDS was under-deducted. The mistake is already made, but you
can still fix it by accurately filing your ITR. Don't panic. Deadline: Today — assess your situation
before planning your ITR.
02
Collect Form 16 from both employers: Previous employer and current employer.
Contact your previous employer (or check your email/payroll portal) and download the Form 16 for the
period you worked with them. Do the same with your current employer. You now have two Form 16
documents. These show: salary paid by each employer, TDS deducted by each employer. Keep these safe
— you'll need them to file your ITR and reconcile your actual tax. Example: Form 16 from Employer 1
shows Rs. 8 lakh salary, Rs. 48,000 TDS. Form 16 from Employer 2 shows Rs. 10 lakh salary, Rs.
60,000 TDS. Deadline: By August 10.
03
Calculate your actual tax liability: What tax should you pay on your total income?
Add both salaries: Employer 1 (Rs. 8L) + Employer 2 (Rs. 10L) = Rs. 18 lakh total income. Determine
your applicable tax slab. For FY 2025-26 (AY 2026-27), calculate tax on Rs. 18 lakh at your slab
rate (0%, 5%, 20%, 30% depending on how much is in each slab). Include applicable cess and surcharge.
Total tax liability = Rs. 1,44,750 (example). Now subtract total TDS from both employers: Rs. 1,44,750
− Rs. 1,08,000 (combined TDS) = Rs. 36,750 (TAX DEMAND). If this number is positive, you owe tax.
If negative, you get a refund. Deadline: By August 15.
04
Determine if interest under Section 234B will apply to your demand.
Interest under Section 234B applies if total TDS is less than 90% of assessed tax. Check: Total TDS
(Rs. 1,08,000) vs. 90% of actual tax (90% × Rs. 1,44,750 = Rs. 1,30,275). Since Rs. 1,08,000 < Rs.
1,30,275, interest under Section 234B applies. Additionally, if demand exceeds Rs. 10,000 (your demand
is Rs. 36,750), interest under Section 234C also applies. Interest is calculated at 1% per month from
April 1, 2026, to your payment date. If you pay in August, interest = Rs. 36,750 × 1% × 4 months ≈
Rs. 1,470 (approximately). Deadline: Calculate interest by August 18.
05
File your ITR with both Form 16s and accurate income calculation — don't hide the demand.
Log into the income tax portal. File your ITR (likely ITR-2, since you have salary income). Include:
Employer 1 salary in salary section. Employer 2 salary in salary section. Total income = Rs. 18 lakh.
Deductions (if any) — standard deduction, 80C, etc. Calculate tax on total income. Enter TDS from
both Form 16s. The system will show either a refund or demand. In your case, it shows a demand of
Rs. 36,750. Don't try to hide the demand or file incomplete — report it accurately. A correct,
complete ITR protects you better than an incomplete one. Deadline: By July 31, 2026 (or extended
deadline).
06
E-verify your ITR within 30 days of filing — completing the process.
After filing, log back into the portal and e-verify your return using OTP or Digital Signature. This
finalizes your ITR submission. Once e-verified, your ITR is considered complete and filed. The
demand shown in your ITR is now officially recorded with the department. Deadline: Within 30 days of
filing (by August 30 if you filed in early August).
07
After receiving 143(1) intimation, verify the demand amount and interest calculation.
A few weeks after e-verifying your ITR, the Income Tax Department will issue a Section 143(1)
intimation showing their processing result. This intimation will show: total income considered, TDS
credited, tax calculated, and final demand (if any). Check this intimation carefully. Does the total
income match your two Form 16s combined? Does the TDS match both Form 16s? Is the demand amount
correct? If you spot an error (e.g., they miscalculated TDS or missed a deduction), you can file a
rectification request. If the demand is correct, proceed to Step 8. Deadline: Check your account
within 1 week of receiving the intimation.
08
Pay your tax demand BEFORE it accumulates interest — act immediately.
Don't delay paying the demand. Interest at 1% per month compounds. A Rs. 36,750 demands paid in
September costs more in interest than the same demand paid in August. Pay through the official income
tax website or an authorized bank using your PAN. Get a challan/receipt with a reference number.
Keep this proof. Paying promptly also demonstrates good faith if the department ever questions your
return. Deadline: Pay by end of August (or as soon as possible after receiving 143(1) intimation).
09
If you missed Form 12B submission, submit it NOW to your current employer for future years.
Even though the damage for FY 2025-26 is done, ensure it doesn't happen again for FY 2026-27.
Download Form 12B. Fill in your previous employer details (name, TDS, period). Submit it to your
current employer in writing (email + hardcopy for record). This ensures that when you switch jobs
again, your new employer has this information and calculates correct TDS on incremental income. For
FY 2026-27 onwards, this prevents repeat of the job-switch tax trap. Deadline: Submit to current
employer by October 2026.
10
For any future job switches: Always submit Form 12B to the new employer BEFORE they start deducting TDS.
When you next change jobs, don't make the same mistake. On your first day of joining the new employer,
or during the onboarding process, immediately provide Form 12B with your previous employer's
information. This is often overlooked because HR teams focus on salary, benefits, and admin — not
taxes. Be proactive. Ask: "Should I submit Form 12B for tax deduction accuracy?" If HR is unfamiliar,
explain it briefly: "This tells you about my previous salary and TDS so you deduct correct TDS on
my salary with you." Most employers appreciate this proactivity. Deadline: On or before your first
payroll with any new employer.
11
After paying the demand, keep all receipts and Form 16s for 7+ years — they're your proof.
File away: Both Form 16s (Employer 1 and 2), your ITR acknowledgement, Section 143(1) intimation,
and proof of tax payment (challan). If the department ever questions your return (even years later),
you have complete proof of your salary sources, TDS paid, and tax demand settled. Digital copies are
fine — keep them backed up. These documents also help your next CA understand your income history.
Deadline: Organize and retain indefinitely (7+ years minimum).
The job-switch tax trap is not a trap — it's predictable arithmetic. Two employers, each calculating TDS on half-year salary, inevitably result in combined TDS that's less than tax on full-year income. This isn't the employer's fault — they have no visibility into each other's salaries. It's the system's design. The solution is Form 12B: a simple form that bridges the gap. Submitting Form 12B to your new employer prevents the demand entirely. Not submitting it means you accept a tax demand, interest, and the headache of reconciling Form 16s during ITR filing. The choice is simple: spend 5 minutes submitting Form 12B during your first week at a new job, or spend 30 minutes fighting with tax demands and interest later. Choose wisely — especially if you switch jobs frequently.
Switched jobs and got a tax demand instead of a refund? Or missed Form 12B?
CA Rishabh will handle this for you
Reconcile both Form 16s • Calculate actual tax liability • Explain demand and interest • File ITR correctly • Avoid penalties
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