I paid advance tax under the wrong year or code, what now?

You paid tax online or at a bank. Later you notice the challan shows the wrong assessment year. Or the wrong payment type, say advance tax when it should have been self-assessment tax, or the other way round. Now you worry the money is lost, or that your return will show tax unpaid.

The tax is very likely not lost: the law counts tax already paid. The task is to get it matched to the right year and type. Be clear about one limit. The step-by-step mechanics of a challan correction (the portal screens, the forms a bank uses, the time allowed) are not something we can quote from law text. For those we say plainly: ask your bank, or ask your jurisdictional Assessing Officer. We do not guess at them here.

Two Acts, two sets of section numbers

Which Act applies depends on the year the payment belongs to.

• Payments for financial year 2025-26 (assessment year 2026-27) fall under the Income-tax Act, 1961, as amended by the Finance Act 2026.
• Payments for tax year 2026-27 onwards fall under the Income-tax Act, 2025, in force from 1 April 2026.

The Income Tax Department's own portal FAQ for the transition says the two years must be kept apart. It tells taxpayers to keep income, expenses, TDS and advance tax for FY 2025-26 (old Act) separate from FY 2026-27 (new Act). It also says to ensure all challans correctly reflect AY 2026-27 or Tax Year 2026-27 as applicable. That is exactly the slip this article deals with: a challan that carries the year the payer had in mind, not the year the tax belongs to.

The section map from the 1961 Act to the 2025 Act (from the Department's mapping table) is:

The wording quoted below is from the Income-tax Act, 2025, which governs payments for tax year 2026-27 onwards. If your payment is for financial year 2025-26 (assessment year 2026-27), the Income-tax Act, 1961 governs: read sections 140A, 208 to 211, 234B, 234C and 234F of that Act, as amended by the Finance Act 2026. We have not reproduced their text here, so we state no 1961 Act due date, interest rate or fee amount. Do not read the 2025 Act dates below as the dates for a 2025-26 payment.

What the law says about tax already paid

Advance tax is a payment you make on your own accord

Under section 404 of the Income-tax Act, 2025, advance tax is payable during a financial year where the tax payable for that year is ₹10,000 or more.

Under section 406(1), every person liable to pay advance tax shall, on his own accord, pay it on or before the due date of each instalment, as specified in section 408. Section 406(2) lets a person who has paid an instalment increase or reduce the amount in the remaining instalments to match the estimate of current income.

So advance tax is self-driven. Nobody sends you a bill. The challan you create is the only record that links the money to a year and a type. That is why a wrong entry on it matters.

The instalment dates

Section 408(1) of the Income-tax Act, 2025 sets four instalments in each financial year: by 15 June (not less than 15% of the advance tax), by 15 September (not less than 45%, less what was paid earlier), by 15 December (not less than 75%, less what was paid earlier) and by 15 March (the whole amount, less what was paid earlier). Section 408(2) has a separate rule for taxpayers who declare profits under section 58(2) (Table: Sl. No. 1 or 3), who pay the whole amount of advance tax in one go.

These dates are from the 2025 Act and apply to tax year 2026-27 onwards. If your mistaken payment is for FY 2025-26, section 211 of the 1961 Act governs the instalments for that year; open its current text. Why this matters: if tax went into the wrong year, the right year may look short on an instalment date, and the interest sections (sections 234B and 234C of the 1961 Act, sections 424 and 425 of the 2025 Act) may then be engaged. We have not opened their wording for this article, so we give no interest figures. A CA can work these out once the payment is matched to the right year.

Tax already paid is credited when you file

Section 266(1) of the Income-tax Act, 2025 (the counterpart of section 140A of the 1961 Act) deals with self-assessment tax. It says that where tax is payable on the basis of the return, after taking into account the amounts listed in sub-section (2), the assessee must pay that tax, with interest and fee, before furnishing the return. The return must be accompanied by proof of payment.

Section 266(2)(a) lists, among the amounts to be taken into account, the amount of tax, if any, already paid under any provision of the Act. Section 266(2)(b) lists any tax deducted or collected at source.

The return must carry proof of payment of the self-assessment tax. If the challan is wrong, your proof is wrong. So fix it before you file, or at least know what you will say when the return does not match.

Common versions of this mistake

Work out which one you made. The fix, and who you ask, differs.

1. Right money, wrong assessment year or tax year. For example, advance tax meant for FY 2026-27 (tax year 2026-27) was paid against AY 2026-27, which is the 2025-26 income year, or the reverse. A slip like this is easy around the April changeover from the 1961 Act to the 2025 Act.

2. Right year, wrong type of payment. You chose advance tax when the payment was made after the last instalment date and is really self-assessment tax. Or you chose self-assessment tax for money you paid in June to count as the first instalment. Both are payments of your own tax. But the type may affect which section the department applies, so have it checked.

3. Wrong PAN. The money is credited to someone else. That is a harder problem than a wrong year; ask your bank and the Assessing Officer.

What to do, step by step

Step 1: Look at what the department holds

Log in to the income tax e-filing portal and check your tax statements: Form 26AS (or the Annual Tax Statement) for the year. The Department's portal FAQ says to reconcile it for each year separately. See whether the payment appears at all, and under which year and type.

Keep your challan receipt and your bank debit entry. They are your proof.

Step 2: Decide which version you have

Compare the year and type shown on the challan with the year and type the payment should have been. Write down the challan details (date, amount, bank, and the challan identification number). The Income-tax Rules, 2026 describe the challan identification number as the Basic Statistical Returns (BSR) code of the bank branch where the tax was deposited, the date of deposit, and the challan serial number given by the bank. Having these three items ready makes any correction request easier.

Step 3: Do not pay again to "make up" the shortfall without checking

A second payment can leave excess tax in one year and a shortfall in another. First find out whether the first payment can be moved.

Step 4: Ask the right party for the correction

This is the part we cannot give procedure for.

• If the error is on the bank side or in how the payment was recorded, ask your bank.
• If the challan was correctly processed and the issue is which year or type the department has credited it to, ask your jurisdictional Assessing Officer. Your e-filing portal profile or your last assessment order shows who that is.

Bring the challan receipt, bank entry, PAN, and a short note of what the payment should have been. Ask what form or request they accept, and the time they take.

Step 5: File the return on time regardless

If correction is slow, do not let it cost you the filing date. The return can show the tax paid with the challan details. If the credit has not yet been matched, the processing of the return may show a difference. Keep your proof ready to answer it. A late return carries a fee. For tax year 2026-27 onwards, section 428 of the Income-tax Act, 2025 provides a sum not exceeding ₹1,000 if total income does not exceed ₹5 lakh, and ₹5,000 in any other case. For AY 2026-27 and earlier, section 234F of the 1961 Act applies, as the Department's portal FAQ also says; we have not opened its current text, so check it. A payment mix-up is not a reason to miss the date.

What not to do

• Do not assume the money is gone. For a 2025-26 payment read section 140A of the 1961 Act; for tax year 2026-27 onwards, section 266(2)(a) of the Income-tax Act, 2025 counts tax already paid. Your task is matching, not re-paying.
• Do not claim credit in the return for a challan you cannot prove. The return must carry proof of payment under section 266(1)(b). Claim only what your documents support.
• Do not ignore a notice or a processing intimation that shows tax unpaid. Reply with the challan proof within the time shown on it.
• Do not guess a procedure. If anyone gives you a step you cannot check against a form or a letter from the department, ask for the source.

What to do now

Have a CA review your facts before you act or file.

Frequently asked questions

Is the tax I paid under the wrong year lost?
No. Section 266(2)(a) of the Income-tax Act, 2025 lists the tax already paid under any provision of the Act among the amounts taken into account against your tax. For a 2025-26 payment, read section 140A of the 1961 Act. The issue is matching it to the right year, not recovering it.

Does the type of payment, advance tax or self-assessment tax, really matter?
It can. Advance tax follows the instalment dates in section 408 of the Income-tax Act, 2025 (section 211 of the 1961 Act), and interest for non-payment or deferment is computed under the interest sections (section 234B and 234C of the 1961 Act; section 424 and 425 of the 2025 Act). Self-assessment tax is paid before filing the return under section 266 (section 140A of the 1961 Act). A wrong type may affect how a payment is treated, so have it matched.

Who corrects a challan, the bank or the department?
Both can be involved, depending on where the error lies. We do not quote a procedure because none is in the law text we have opened. Ask your bank first if the entry was recorded incorrectly. Ask your jurisdictional Assessing Officer if the department credited it to the wrong year or type.

Should I file my return before the challan is corrected?
Do not let the due date pass. File on time, show the payment with its challan details, and keep proof ready for any difference at processing. Section 266(1)(b) of the Income-tax Act, 2025 requires the return to carry proof of payment of the self-assessment tax.

I paid in the wrong year and also missed an instalment date. What happens to interest?
Interest for advance tax defaults is dealt with by section 234B and 234C of the 1961 Act (section 424 and 425 of the 2025 Act). We have not opened their wording for this article, so we give no figures. A CA can compute it once the payment sits in the right year.

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