Miss the 45-day payment window on a Micro or Small enterprise invoice, and it’s not just a late payment, it’s an expense you can’t deduct this year at all.
Section 43B(h) of the Income Tax Act ties a real tax consequence to how fast you pay Micro and Small suppliers. Under Section 15 of the MSMED Act, you owe payment within 45 days if there’s a written agreement, or 15 days if there isn’t one. Miss that window, and the expense doesn’t just sit there waiting, it gets disallowed for the year entirely, deductible only in whichever future year you actually make the payment. That’s a full year’s deduction pushed out, not a minor timing quirk, and it applies regardless of your own business size, any buyer owes this to a registered Micro or Small supplier.
This obligation only attaches to suppliers who are actually Udyam-registered as Micro or Small enterprises, Medium enterprises aren’t covered by it. Which means the first real compliance task isn’t tracking payment dates, it’s knowing which of your vendors are covered in the first place. A vendor master that hasn’t been checked against Udyam registration status is the single most common reason this gets missed, disallowances show up at year-end audit for invoices nobody realised were even in scope.
Late payment carries its own cost beyond the tax disallowance. Section 16 of the MSMED Act sets interest at three times the RBI’s notified bank rate, compounded monthly, running from the day after the due date until you actually pay. That interest isn’t deductible either, and it keeps compounding for as long as the invoice stays open.
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It entails the issuance of invoices as required by law and taxation, such as the correct details and forms.
It guarantees that transactions are reflected properly and in line with financial and tax laws.
The invoices must contain business information, tax information, invoice number, date and transaction information.
Through excellent records, adherence to tax regulations as well as regular transaction reconciliation.