Section 80DDB Deduction 2026: Tax Relief on Medical Treatment for Specified Critical Illnesses

By Nitish Bharadwaj · Published Jul 24, 2026 · 6 min

Section 80DDB lets a resident individual or HUF claim a deduction for money actually spent treating specified critical illnesses — cancer, Parkinson's and other neurological disorders, AIDS, chronic renal failure, haemophilia, and thalassaemia — for themselves or a dependent. The cap is ₹40,000, rising to ₹1,00,000 for a senior-citizen patient, whichever is lower than actual expenses; any insurance or employer reimbursement received must be subtracted first. It needs a qualified specialist's prescription (a government hospital is no longer mandatory) and, critically, is available only under the old tax regime.

Most tax-saving deductions cap out around ₹1.5 lakh under Section 80C, but Section 80DDB works differently — it isn't about investing to save tax, it's relief for money you were forced to spend treating a serious illness. The catch is that it only covers a specific list of conditions, the deduction amount depends on the patient's age rather than yours, and it disappears entirely if you file under the new tax regime. Here's exactly what qualifies, how much you can actually claim, and the certification step that most people get wrong.

What Section 80DDB Actually Covers

Section 80DDB allows a resident individual or Hindu Undivided Family (HUF) to claim a deduction for amounts actually spent on medical treatment of specified critical illnesses — for themselves, or for a dependent. A dependent, for this section, means a spouse, children, parents, or siblings who are wholly or mainly financially dependent on the taxpayer. The deduction is for money genuinely spent on treatment during the year, not a fixed amount you can claim regardless of actual expenditure — you can only claim up to the lower of the prescribed ceiling or what you actually paid.

The Specified Diseases Under Rule 11DD

Not every serious illness qualifies. Rule 11DD of the Income Tax Rules lists a specific, closed set of conditions, and treatment for anything outside this list — however expensive — does not qualify for this particular deduction.

For the neurological conditions on this list, an additional condition applies: the patient needs a disability certificate confirming a disability level of 40% or more, issued by a neurologist holding a Doctor of Medicine (DM) qualification in neurology, or an equivalent degree recognised by the Medical Council of India — or, for children, a paediatric neurologist with an equivalent qualification.

How Much You Can Actually Claim

The deduction ceiling depends on the patient's age — not the taxpayer claiming it — and on how much of the expense, if any, was already covered by insurance or an employer.

The Certificate You Actually Need

Form 10-I, the old mandatory certificate format that required sign-off from a government hospital specialist, was discontinued back in 2015. Since then, you need a prescription or certificate from a qualified specialist confirming the diagnosis and the disease specified under Rule 11DD — and that specialist no longer has to work at a government hospital. A private-sector oncologist, nephrologist, neurologist, or relevant specialist can issue it, as long as they hold the qualifying degree for that condition. Keep the specialist's certificate, treatment bills and receipts, and — for neurological conditions — the disability certificate together; the deduction is claimed directly while filing your ITR, and these documents only need to be produced if the assessing officer asks for them.

Old Regime Only — This Is the Part Most People Miss

Section 80DDB sits under Chapter VI-A of the Income Tax Act, and the new tax regime under Section 115BAC blocks nearly every Chapter VI-A deduction except a narrow allowed list — the standard deduction and the employer's NPS contribution under Section 80CCD(2) chief among them. Section 80DDB is not on that allowed list. If you're filing under the new regime for FY 2025-26 (AY 2026-27), this deduction simply isn't available to you, no matter how much you spent on treatment or how strong your documentation is.

This makes 80DDB one of several deductions — alongside Section 80E on education loan interest, Section 80G on donations, and the health insurance deduction under Section 80D — that only make financial sense to chase if you're already better off under the old regime for other reasons. Before assuming the old regime is worth it purely for an 80DDB claim, run the actual numbers: for a taxpayer with a large critical-illness expense but few other old-regime deductions, the ₹1,00,000 senior-citizen ceiling can occasionally tip the comparison, but it rarely does so on its own for someone under 60 claiming only ₹40,000.