GST ITC in Tally: How to Handle Input Tax Credit Calculations in TallyPrime

Your purchase register shows ₹4,20,000 of input tax. You claim all of it. Six months later, a notice asks why you never reversed credit on your exempt sales.

This is the part of GST ITC in Tally that trips up most users. Matching your books to GSTR-2B is only half the job. The other half is working out how much credit you could claim in the first place.

This guide covers the calculation side. What gets blocked, what gets split, and how to book each type correctly in TallyPrime.

The 4 Buckets Every Input Tax Amount Falls Into

Before you touch TallyPrime, sort your input tax into four groups. Every rule that follows depends on this split.

1. Fully eligible. Inputs used only for taxable supplies. Claim the whole amount.
2. Fully blocked. Items listed under Section 17(5). No credit, ever.
3. Used only for exempt supplies. No credit either, but for a different reason.
4. Common. Used for both taxable and exempt supplies. This is where the formula work starts.

Most users get buckets one and two right. Buckets three and four are where the notices come from.

Blocked Credits Under Section 17(5)

Section 17(5) of the CGST Act lists inward supplies where credit is simply not available. It doesn’t matter that the expense is genuine or that it’s fully for business.

Common ones you’ll hit in an Indian SME’s books:

• Motor vehicles seating 13 or fewer people, plus their insurance, repair, and servicing
• Food and beverages, outdoor catering, health services, and club memberships
• Works contract services for constructing immovable property, unless you’re supplying works contract onward
• Goods or services for construction of immovable property on your own account

How to Book This in TallyPrime

Don’t create a separate GST ledger and hope you’ll remember at filing time. In the purchase voucher’s GST details, mark the transaction as ineligible. The tax then forms part of the expense value, not your input credit ledger.

The result: your books show ₹1,18,000 of vehicle repair expense, not ₹1,00,000 expense plus ₹18,000 credit you can’t use. Your GSTR-3B ineligible ITC table then picks it up correctly.

Common Credit: The Rule 42 Split

Say you run a business with both taxable sales and exempt sales. Your rent, electricity, and audit fees serve both sides. You can’t claim all that credit.

Rule 42 gives you the formula. Here’s the working, in plain terms.

Step 1: Strip Out What You Can Identify

Start with total ITC for the month, called T. Then remove three things:

• T1 — credit used only for non-business purposes
• T2 — credit used only for exempt supplies
• T3 — credit blocked under Section 17(5)

Step 2: Separate the Purely Taxable Part

Next, pull out T4, the credit used only for taxable supplies, including zero-rated. That’s fully yours.

The remainder becomes C2, your common credit. The formula works on this amount.

Step 3: Work Out the Reversal

Two amounts get reversed each month:

• D1 = (E ÷ F) × C2, where E is exempt turnover and F is total turnover
• D2 = 5% of C2, a flat deemed amount for non-business use

Your eligible common credit is C3 = C2 − D1 − D2. You then add D1 and D2 back to your output tax liability for that month.

One detail people miss: this monthly working is provisional. You have to run a true-up at year end using full-year turnover figures, then adjust the difference.

Not sure your TallyPrime setup captures exempt turnover correctly? Ask our team to check it.

Capital Goods and the Rule 43 Spread

Rule 43 does the same job as Rule 42, but for capital goods. The difference is timing.

You claim the full credit upfront. Then the reversal is spread across 60 months, matching the asset’s assumed useful life of five years.

Each month, the working is:

• Tm = Tc ÷ 60, where Tc is total credit on that capital good
• Te = Tm × (E ÷ F), the amount reversed for that month

A machine used only for taxable output needs no reversal at all. The rule bites when the asset serves both taxable and exempt supplies.

Tracking This in TallyPrime

TallyPrime won’t run the 60-month schedule for you on its own. Most businesses keep a separate asset-wise register and pass a monthly journal voucher for the reversal.

If you own several such assets, this is worth building into a custom report. Our guide on Tally customization services and costs covers what that typically involves.

Reverse Charge ITC in TallyPrime

Reverse charge works differently from a normal purchase. You raise the liability first, pay it, and only then claim the credit.

TallyPrime handles this through a two-step flow:

1. Record the purchase with the ledger marked as applicable for reverse charge.
2. Pass a journal voucher to raise the liability in your books.
3. Pass a second journal voucher to book the input credit, once the liability is paid.

To see what’s still pending, open GSTR-3B and drill into Input Credit to be Booked. The report lists RCM purchases, imported goods, and imported services still awaiting a credit entry. Tally’s own TallyHelp documentation walks through the screens in detail.

Skip this report and you’ll do one of two things. Either claim less credit than you’re owed, or claim credit on a liability you never paid.

The Set-Off Order That Saves You Cash

Once you know your eligible credit, the order you use it in decides how much cash leaves your bank.

Section 49A and Rule 88A fix the sequence:

1. IGST credit goes first, against IGST liability.
2. Leftover IGST can then cover CGST and SGST liability, in any order or proportion you choose.
3. Only after IGST is fully used can you touch CGST or SGST credit.
4. CGST credit covers CGST first, then IGST. It can never pay SGST.
5. SGST credit covers SGST first, then IGST. It can never pay CGST.

Step two is where the money is. You can split leftover IGST credit freely. A smart split avoids stranding credit on one side while paying cash on the other.

TallyPrime shows your balances by tax type, so you can see the split before you file rather than after.

5 Mistakes That Cost Real Money

1. Treating every credit as common credit. If an input is clearly for taxable supplies only, say so at invoice level. Blanket reversals give away credit you were entitled to keep.
2. Forgetting the annual true-up. Monthly Rule 42 working is provisional. The year-end recomputation is not optional.
3. Booking blocked ITC as credit, then reversing it later. Cleaner to keep it out of the credit ledger from the start.
4. Claiming RCM credit before paying the liability. The credit only arises once the tax is actually paid.
5. Missing the Section 16(4) deadline. Credit on an invoice lapses permanently if not claimed in time. No appeal recovers it.

Once your calculation is right, check it against the portal. Our guide to GST reconciliation in TallyPrime covers GSTR-2B and IMS in detail.

Frequently Asked Questions

About AtTally Sofper Pvt. Ltd.

AtTally Sofper Pvt. Ltd. is an authorized Tally partner, working with businesses and CA offices since 1999. We’re based in Visakhapatnam (Vizag) and Vijayawada.

For GST ITC in Tally, we handle ledger and voucher setup. Blocked credits stay out of your credit ledger, reversals get posted monthly, and RCM entries don’t sit pending. We also build custom reports where standard Rule 43 tracking falls short.

We offer online and remote support, so most setup work doesn’t need an office visit. Reach out to our team before your next filing.