Can You Deduct Cash Business Expenses in Sri Lanka?

Here's a way to turn a legitimate Rs. 600,000 business cost into a Rs. 216,000 tax bill: pay it in cash. Same expense, same supplier, same invoice. The only thing that changed was how the money moved, and that alone can wipe out the entire deduction.

This catches people off guard because it feels wrong. The expense is real. You have the receipt. You actually spent the money on your business. So why can't you deduct it? Because Sri Lankan tax law cares not just about what you paid for, but how you paid. Get the cash expense tax deduction rule wrong and a payment method alone can cost you the whole deduction.

Let's go through exactly when cash kills a deduction, and the simple step that keeps you safe.

What is the Rs. 500,000 cash payment rule?

Section 10(2A) of the Inland Revenue Act sets a limit on cash payments. If you make a payment to another person that reaches Rs. 500,000 or more and you don't route it through an approved banking channel, the law disallows it.

The disallowance is total, not partial. This is the part people underestimate:

• The whole expense is gone. It's not capped or reduced. The entire payment is not allowed as a deduction in calculating your income.
• It's not just income deductions. The amount also can't be treated as the cost of an asset. So if you bought equipment, you lose the capital allowances (depreciation) on it too, and it's excluded from the cost base when you eventually sell.

The important reframe: the rule isn't really anti-cash. It's anti-untraceable. The state wants a money trail for large business payments. Pay through a channel that leaves one, and you're fine. Pay hand-to-hand in notes, and you're not.

What counts toward the Rs. 500,000 threshold?

People assume they can dodge the rule by breaking a big payment into smaller ones. You can't. The Rs. 500,000 is measured in aggregate, and the law spells out three ways it adds up:

• In a single day. Multiple cash payments to the same person on the same day are totalled.
• In a single transaction. One purchase on a single invoice, receipt, or statement, even if you pay it off in pieces.
• In a series of transactions relating to one event. This is the anti-splitting catch. Breaking one purchase into several smaller payments doesn't save you if they all relate to the same underlying event.

Which payment methods keep an expense deductible?

To keep a payment of Rs. 500,000 or more deductible, it has to move through a bank or financial institution in Sri Lanka. The approved methods are:

• An account payee cheque or account payee bank draft
• A credit card, debit card, or electronic payment through a bank account
• Depositing cash directly into the recipient's bank account

That last one matters, and it's the practical escape hatch. Confirmed by the Inland Revenue (Amendment) Act No. 11 of 2026, depositing cash straight into your supplier's account counts as an approved method. So even if your business runs largely on cash, you don't have to find a cheque book. Walk the cash to the bank and deposit it into the payee's account, and the payment stays deductible because now there's a record.

For the broader picture of which costs even qualify as deductions before this rule applies, see our guide on what expenses a Sri Lankan freelancer can deduct.

Are there any exceptions to the rule?

Yes. The cash restriction does not apply to certain payments, regardless of size:

• Payments to or by the Government of Sri Lanka or a government institution
• Payments to or by a bank or financial institution
• Other classes of persons or payments the Minister may prescribe

So a large cash payment to a government body, or a transaction with a bank, isn't caught by Section 10(2A). For everyday business-to-business and business-to-supplier payments, though, you're squarely inside the rule, and the exceptions won't help you.

What does paying in cash actually cost you? (worked example)

Take Suresh, who runs a small printing business taxed at a top marginal rate of 36%. He buys a second-hand machine from another business for Rs. 600,000 and pays the seller in cash, by hand.

Because the payment is over Rs. 500,000 and didn't go through a bank channel, Section 10(2A) disallows it entirely. The damage is double:

By paying in cash, Suresh hands the tax office an extra Rs. 216,000, because the Rs. 600,000 he genuinely spent can't reduce his taxable income, and he can't depreciate the machine either. Had he deposited the same Rs. 600,000 into the seller's bank account, the expense would be fully deductible and the machine fully depreciable. Same money out of his pocket. A Rs. 216,000 swing in tax, decided purely by payment method.

If asset purchases are a regular part of your business, our guide on how capital allowances are calculated explains the depreciation you'd be giving up.

How do I stay deductible?

The fix is genuinely simple. For any business payment of Rs. 500,000 or more:

1. Don't pay in hand-to-hand cash. That's the only thing the rule actually penalises.
2. Use a traceable channel. Cheque, bank draft, card, transfer, or a cash deposit into the payee's account all work.
3. Keep the proof. The cheque counterfoil, transfer confirmation, or deposit slip is what ties the payment to the channel if you're ever asked.
4. Watch the aggregation. Remember that same-day, same-invoice, and same-event payments add up. Judge the threshold by the total, not the individual slip.

So, can you deduct cash business expenses in Sri Lanka? For small payments, yes, without a second thought. But once a payment reaches Rs. 500,000, the method decides everything. Route it through a bank channel and the deduction is yours. Hand over cash and you lose it entirely, this year and, for assets, every year of depreciation after. Knowing that one threshold is worth real money. If you want to see how the deduction feeds into your final bill, our income tax calculation guide walks through the rest.