What was Form 12C?
An employer computing tax on salary works from the salary it pays. It has no visibility of the interest an employee earns, the rent they receive, or the freelance income they declare, and it does not need any, because the employee settles all of that in their own return.
There are two situations where that separation is inconvenient. An employee with substantial other income ends the year with a large self-assessment liability, having had tax deducted only on salary. An employee paying interest on a home loan is in the opposite position, deducted through the year at a rate that ignores a loss they will certainly claim.
Form 12C was the prescribed answer. The employee reported other income, and loss from house property, to the employer, and the employer took it into account when computing deduction on salary. The form asked for the figures by head and was verified by the employee.
It was later omitted from the Income Tax Rules. The form ceased to exist as a prescribed document, and the specific rule that prescribed it went with it. Confirm the omitting amendment and its date before relying on either.
What replaced it?
Nothing, in the sense of a prescribed form for other income. Something, in the sense that the substance survived.
The provision allowing an employer to take other income into account when computing deduction on salary remains. What it asks for is that the employee furnish the particulars, verified by them, and there is no longer a prescribed format for doing so. Employers collect it through their own declaration, usually as part of the annual investment declaration exercise, and that is acceptable.
Two things frequently get confused with it.
- Form 12BB is a prescribed form, and it is current, but it covers a different subject. It is where an employee claims exemptions and deductions: house rent allowance, leave travel, interest on borrowed capital for a house property, and deductions under Chapter VI-A. It is a claim for relief, not a report of income earned elsewhere.
- Reporting tax deducted or collected by other parties is a further and separate matter, dealt with by its own prescribed particulars. That is about credit already given, not income received.
So the practical answer to an employee asking which form to use for their rental income is that there is no form, only a declaration, and their employer will have one.
What can and cannot reduce salary deduction
This asymmetry is the part worth getting right, because it is where employers create exposure for themselves.
| Reported item | Effect on salary deduction |
|---|---|
| Other income, such as interest or rent received | Increases it. The employer may take it into account. |
| Loss from house property | Reduces it, subject to the limit on set-off against salary. |
| Loss under any other head, such as capital loss or business loss | Cannot be taken into account by the employer at all. |
The rule behind it is straightforward. Reporting other income can only ever raise the deduction, so there is no risk to the revenue in allowing it. Allowing losses to lower it creates the opposite risk, so exactly one loss is permitted and it is capped.
An employee who reports a trading loss and asks for their salary deduction to be reduced is asking for something the employer cannot do, however genuine the loss. It is claimed in their return.
What should an employer do now?
Three things, none of them large.
- Take the reference out. Handbooks, joining kits, payroll checklists and finance intranets still name Form 12C, usually because the wording was copied from a template written before it was omitted. Replace it with the employer's own declaration.
- Keep collecting the substance. An employee with a home loan is materially better off having the loss reflected through the year than waiting for a refund, and an employee with large other income is better off not meeting a self-assessment bill in one instalment. The declaration is worth asking for even without a prescribed form behind it.
- Hold the evidence. The employer computing a lower deduction on the strength of a declaration is the party who has to justify it. A signed declaration and the supporting document, retained, is the whole of the defence.
If an employee produces a filled Form 12C from a template site, there is no harm in accepting the information on it. It is a declaration with an obsolete heading, and the figures are the point.
Why the confusion persists
Withdrawn forms have a long afterlife. Form 12C is still circulated by template sites, still named in checklists inherited from earlier systems, and still asked for by finance teams who learned the process when it was current.
The other reason is that its function is genuinely needed. Employees do have other income, and they do have home loans, and something has to carry that information from one to the other. A named form is easier to ask for than a declaration, so people reach for the name they know.
The correction to make is not that the information is unnecessary. It is that the form is gone, the format is now the employer's, and the item to check is whether the declaration you collect actually asks for what the provision requires: income by head, loss from house property separately, and a verification by the employee.
Statutory reference
- Act
- Income-tax Rules, 2026, with the Income-tax Act, 1961 for tax years beginning before 1 April 2026
- Section
- It was prescribed under Rule 26B of the Income-tax Rules, 1962 and had already been omitted before the 1961 Act itself was repealed on 1 April 2026. Its function survives: under rule 204(1) of the Income-tax Rules, 2026 the employee furnishes Form 122 to the person responsible for paying salary under Section 392(1) of the Income-tax Act, 2025, covering salary from any other employer in the tax year, loss under Income from house property, and other income that is not a loss. Evidence of claims is a separate matter and goes in Form 124 under rule 205(1). No counterpart has been located in the Income-tax Act, 2025, so neither the set-off nor any limit is asserted here
- Key limits
- Form 12C is omitted and no longer prescribed. Other income may be taken into account by the employer only to increase deduction. Loss from house property is the only loss that may reduce it, capped at the prescribed set-off limit. No other head's loss may be considered.
Frequently asked questions
Is Form 12C still valid?
No. It was omitted from the Income Tax Rules and is no longer a prescribed form. Checklists and handbooks that still ask for it are quoting a template written before the omission.
What is used instead of Form 12C?
There is no prescribed replacement. An employee reports other income and loss from house property to the employer by declaration, in whatever format the employer collects, and the employer takes it into account in the salary computation.
Is Form 12BB the replacement for Form 12C?
No, they cover different things. Form 12BB is a current prescribed form for claiming exemptions and deductions such as house rent allowance and Chapter VI-A relief. Form 12C reported income earned outside the employment.
Can I ask my employer to reduce my TDS because of a loss?
Only for a loss from house property, and only up to the prescribed set-off limit. Business losses and capital losses cannot be taken into account by an employer at all, however genuine. They are claimed in your own return.
Should I tell my employer about my interest and rental income?
You are not obliged to, and doing so will raise your monthly deduction rather than lower it. The reason to do it anyway is that the alternative is a single large self-assessment payment when you file, computed on income the employer never saw.
How Engage handles other-income declarations
Engage collects other income and loss from house property as part of the declaration cycle rather than as a form nobody can find, applies each to the salary computation in the direction the provision allows, and refuses set-offs it cannot legally make instead of quietly applying them. The declaration and its evidence stay attached to the computation, so the reason a deduction was lower is visible when someone asks a year later.
See income tax handling in Engage