80DDB Medical Treatment Deduction Calculator

A deduction for serious, specified illnesses

Section 128 — formerly Section 80DDB — recognises that the cost of treating a serious illness can be crushing, and gives a deduction for it. But it is deliberately targeted: it applies only to a list of specified diseases, not to medical expenses in general. The list covers conditions such as specified malignant cancers, chronic renal (kidney) failure, certain neurological diseases where the disability is severe, haematological disorders like haemophilia and thalassaemia, and AIDS.

The deduction is available for the treatment of yourself or a dependant — typically your spouse, children, parents, or dependent siblings. You claim it as the person who bore the cost of treating a dependant with one of these conditions, or your own. Ordinary medical bills, routine treatment, or illnesses outside the specified list do not qualify here; they may be covered by other provisions, such as the health-insurance deduction, but not by this one.

Because it is condition-specific, a genuine claim rests on a diagnosis of one of the listed diseases, and the law requires a prescription from the relevant specialist — an oncologist, nephrologist, neurologist and so on, as appropriate to the disease. Without that prescription the deduction does not stand, so the certificate is not a formality but a condition of the claim. The calculator computes the figure; the prescription and bills are what let you actually claim it.

The limit, and the higher cap for senior citizens

The deduction is capped, and the cap depends on the patient's age. For a patient below 60, the maximum deduction is ₹40,000. Where the patient is a senior citizen — 60 or over — the cap rises to ₹1,00,000. The higher limit reflects that serious illnesses are both more common and more expensive to treat in later life, and it is a meaningful difference: two and a half times the deduction for the same condition.

A point that catches people out is whose age sets the limit. It is the age of the patient being treated, not the age of the taxpayer claiming the deduction. So a working-age person paying for the treatment of an elderly parent gets the ₹1,00,000 senior limit, because the parent is the patient — even though the claimant is nowhere near 60. Getting this right can double the deduction, and the calculator asks specifically about the patient's age for this reason.

The cap applies to the amount you spent, before any insurance is considered. If you spend less than the limit, the deduction starts from what you actually spent; if you spend more, it is capped at ₹40,000 or ₹1,00,000 as applicable. The calculator applies the correct cap based on the patient's age and shows it explicitly, so you can see whether your cost or the statutory limit is the binding constraint.

The insurance reduction — the step everyone forgets

This is the single most common error with the medical-treatment deduction, and the reason the calculator asks about it prominently. The deduction is reduced by any amount you received from a health-insurance claim or as a reimbursement from your employer for the same treatment. You can only deduct the part of the cost you genuinely bore yourself — not the part someone else paid for.

So the arithmetic is: take the lower of what you spent or the applicable limit, then subtract what insurance or your employer reimbursed. If you spent ₹80,000 on a non-senior patient, the eligible amount is capped at ₹40,000; if insurance paid ₹30,000 of the cost, the deduction is ₹40,000 minus ₹30,000, or ₹10,000 — not the full ₹40,000. Claiming the gross limit while ignoring the insurance is a straightforward over-claim that a scrutiny would catch, with interest and penalty on the excess.

Where the reimbursement meets or exceeds the eligible amount, the deduction is nil — there is simply nothing you bore yourself to deduct. That can feel harsh when the illness was serious and costly, but it follows from the principle that the deduction relieves your own out-of-pocket cost, not costs an insurer already met. The calculator does this subtraction automatically and flags when insurance has absorbed the whole deduction, so you claim the honest net figure.

Old regime only

Like the other deductions for personal expenses, Section 128 is available only in the old tax regime. In the new regime — the default — the cost of treating a specified disease gives no deduction at all. So before counting on this relief, you need to be in the old regime, and the old regime has to make sense for you overall.

For most people a single medical-treatment deduction, capped at ₹40,000 or ₹1,00,000, is not by itself enough to justify choosing the old regime over the new one's lower rates and larger standard deduction. It is more often one deduction among several — alongside 80C, health insurance, home-loan interest and the like — that together tip the balance towards the old regime. Taken in isolation it rarely decides the regime; taken with the rest it can contribute.

The calculator makes the regime dependence explicit: switch to the new regime and the saving falls to zero, with a note showing what the deduction would have been worth in the old one. If your family has faced a serious illness and the deduction is meaningful, treat it as one input into a full old-versus-new comparison rather than a standalone reason to pick a regime.

What you need to claim it

A valid claim needs two things beyond the spending itself: the illness must be one of the specified diseases, and you must hold a prescription from the appropriate specialist confirming it. The prescription is the document that establishes the diagnosis and the eligibility, and the requirement is specific about the kind of specialist for each disease. Keep it safely, along with the treatment bills and the insurance or reimbursement statements that show what you received.

The documentation matters because this is a deduction that tax authorities scrutinise — it is condition-specific and reduced by reimbursement, both of which invite verification. A claim supported by a specialist's prescription, itemised bills, and a clear insurance statement is straightforward to defend; one without the prescription, or that ignores an insurance payout, is vulnerable. The calculator gives you the correct figure; the paperwork is what makes it stick.

It is also worth being clear that the deduction is for treatment, not for insurance premiums — those are covered separately under the health-insurance deduction. And it is distinct from the deductions for disability, which apply to a dependant with a disability or to the taxpayer's own disability rather than to treating a specified disease. The calculator is focused on the treatment-cost deduction specifically, so use it for that and the right neighbouring tool for the others.

Using this calculator well

Enter what you actually spent on the treatment, and be accurate about the patient's age, because that decides whether the ₹40,000 or the ₹1,00,000 limit applies — and remember it is the patient's age, so treating an elderly parent gets the higher cap even if you are young. Then enter every rupee of insurance or employer reimbursement honestly, since the deduction is net of it and over-claiming is the classic mistake here.

Set your regime and marginal rate so the saving is real: the deduction is worthless in the new regime, and its value in the old one scales with your slab. If the calculator shows a meaningful old-regime saving, fold it into a full regime comparison rather than treating it alone as decisive. If insurance has wiped out the deduction, accept the nil result — the relief is for your own cost, not the insurer's.

Finally, treat the limits as current and confirm them for your year, and keep the specialist's prescription and the bills, because the claim depends on them. This is a computation to give you the correct, defensible deduction figure and the tax it saves — not a substitute for advice on your overall deductions and regime choice, especially in a year when a family has faced a serious illness and several reliefs may interact.