TDS Interest Calculator

What Is TDS and Why Does the Due Date Matter So Much?

TDS — Tax Deducted at Source — is one of those things that sounds complicated until someone explains it plainly. When you make a payment (salary to an employee, fees to a contractor, interest on a fixed deposit), the government requires you to deduct a portion of that payment as tax and deposit it with the Income Tax Department. You’re essentially collecting tax on the government’s behalf.

Now here’s the part most people miss: the money you deduct doesn’t belong to you. The moment TDS is deducted, it’s the government’s money — and the government expects it by a very specific due date. Miss that date, even by a single day, and interest kicks in automatically under Section 201(1A) of the Income Tax Act, 1961. No reminders, no grace period, no exceptions.

That’s why knowing how TDS interest is calculated isn’t just good practice — it’s essential for anyone managing finances for a business, firm, or employer.

Three Types of TDS Defaults — and Their Penalties

The Income Tax Act distinguishes between three different types of TDS failures, and each one carries a different consequence. Understanding which category applies to your situation is the first step to calculating the right amount.

1. Late Deduction of TDS (Section 201(1A))

This happens when TDS was required to be deducted at the time of payment or credit — but wasn’t. The law doesn’t care why it was missed. Interest is charged at 1% per month (or part of a month) starting from the date TDS should have been deducted to the date it was actually deducted.

Even a one-day delay is treated as a full month. So if TDS of ₹25,000 should have been deducted on 5th February but was deducted on 1st March, interest applies for two months (Feb and March both count). Interest = ₹25,000 × 1% × 2 = ₹500.

2. Late Deposit of TDS (Section 201(1A))

This is more common — TDS was correctly deducted, but the deposit to the government was delayed. The due date for most TDS deposits is the 7th of the following month (except for March, which is due by 30th April). The interest rate here is higher: 1.5% per month (or part of a month), from the due date of deposit to the actual payment date.

Example: TDS of ₹50,000 deducted in July, due by 7th August, but deposited on 21st September. That’s a delay spanning August and September — 2 months. Interest = ₹50,000 × 1.5% × 2 = ₹1,500.

3. Late Filing of TDS Return (Section 234E)

Even after deducting and depositing TDS, you’re required to file a quarterly TDS return. Miss the filing deadline and a penalty of ₹200 per day applies — but it’s capped at the total TDS amount for the quarter. So you’ll never pay more penalty than the TDS itself, but ₹200 per day can add up fast.

TDS Interest Formula (Simple and Clear)

The formula used by this calculator and the Income Tax Department is straightforward:

Interest = TDS Amount × Rate % × Number of Months (including part months)

For late filing penalty: Penalty = Days of Delay × ₹200 (capped at total TDS amount)

The tricky part is always the month count. The rule is that any part of a month — even a single day — is treated as a complete month. This is why a deposit that’s just 2 days late (say, deposited on 9th August when it was due on 7th August) still attracts interest for 1 full month. Our calculator handles this automatically so you don’t have to count manually.

TDS Return Due Dates — Quarter by Quarter

Knowing when your TDS return is due is the starting point for avoiding penalties. Here’s the official schedule:

TDS Deposit Due Dates — When Must You Pay?

Interest Rates at a Glance

How to Use This TDS Interest Calculator

The calculator has three tabs — one for each type of default. Here’s how to use each one correctly.

Tab 1 — Late Deduction Calculator

1. Enter the TDS amount that should have been deducted.
2. Select the date on which TDS was originally required to be deducted (usually the date of payment to the payee).
3. Enter the date TDS was actually deducted.
4. Click Calculate — the tool counts the months (with part months as full months) and applies 1% per month.

Tab 2 — Late Payment Calculator

1. Enter the TDS amount that was deducted.
2. Enter the statutory due date for deposit (7th of next month, or 30th April for March).
3. Enter the date TDS was actually deposited.
4. Click Calculate — interest is computed at 1.5% per month including any partial month.

Tab 3 — Late Filing Penalty Calculator

1. Enter the total TDS amount for the quarter.
2. Select the quarter (Q1 through Q4) and the financial year.
3. Enter the date you actually filed the TDS return.
4. Click Calculate — the tool calculates days of delay, applies ₹200/day, and caps it at the TDS amount.

Can TDS Interest Be Avoided Altogether?

Yes — but only through strict compliance. TDS interest is not waivable under normal circumstances. The tax department treats it as a mandatory levy, not a discretionary penalty. The only way to avoid it is to deduct on time and deposit on time.

That said, if you’ve already missed a deadline, the best move is to deposit as soon as possible and file a revised return if needed. The interest calculation is based on the actual deposit date — so every additional day of delay adds to the liability.

A word on Section 271H: apart from the ₹200/day penalty, the Assessing Officer can also impose an additional penalty of ₹10,000 to ₹1,00,000 under Section 271H for non-filing, delayed filing, or incorrect filing of TDS returns. This is a discretionary penalty, but it’s worth knowing about.

Common Mistakes That Lead to TDS Interest

• Treating the due date as “7th” universally — For March TDS, the deposit is due by 30th April, not 7th April. Many deductors miss this.
• Counting delay in calendar days instead of months — The law uses months, not days, for interest calculation. A 2-day delay = 1 full month of interest.
• Ignoring TDS on advance payments — TDS must often be deducted at the time of advance payment too, not just at final settlement.
• Not filing the return even after deposit — Depositing TDS and filing the return are two separate obligations. Depositing without filing still attracts the ₹200/day penalty.
• Wrong challan details — Using wrong Assessment Year or wrong section in the challan can create mismatches and trigger notices.

Frequently Asked Questions

Disclaimer: This calculator is for educational and estimation purposes only. It does not constitute professional tax advice. Please consult a qualified Chartered Accountant or tax professional for specific guidance. Interest rates and due dates are as per the Income Tax Act, 1961, and may be subject to amendments.