Do I have to deduct tax before paying my overseas supplier from India?
If the sum is chargeable to tax in India, yes. Section 195 puts the obligation on you as the payer, before the money leaves. The difficult part is that you have to decide chargeability, and you carry the consequences of deciding it wrongly. A payer who deducts nothing because the supplier said no Indian tax arises is the person assessed if that turns out to be incorrect, and the disallowance of the expense usually bites as well. So the determination is made and documented before the remittance rather than defended afterwards.
What happens if I decide the payment is not chargeable in India?
You can reach that conclusion, but you should be able to show how. Section 195 asks whether the sum is chargeable in India, and the answer often turns on the character of the payment, whether the recipient has a taxable presence in India, and what the treaty does with that category of income. A written determination that identifies the payment, names the basis on which it is not chargeable and attaches the recipient's residence evidence is what turns a judgement into a defensible position. Nothing on file means the burden falls back on you when the question is asked years later.
Why does my bank want a certificate before remitting the money abroad?
Because the remittance route requires the bank to see that the tax position has been dealt with before foreign exchange leaves the country. India runs two regimes over the same transfer: the tax law, which decides whether a deduction is required, and the exchange-control rules, which decide whether the payment may be made at all and on what evidence. Satisfying one is not satisfying the other. The bank is enforcing the second and will hold the transfer until the first has been documented in the form it is required to see.
Can I deduct at the treaty rate instead of the rate in the Act?
Where the treaty gives a lower rate for that category of income and the recipient is entitled to it, the deduction can be made on that basis. But the entitlement has to be evidenced at the time of payment, with the recipient's residence certification and the declarations the rules call for in your hands. As payer you are relying on someone else's status for your own protection, which is why the file matters more than the conclusion. A treaty rate applied on the strength of an email from the supplier is the version of this that fails on review.
Who bears the tax if the contract says the payment is net?
Then you do, and the arithmetic is worse than people expect. If the contract promises the non-resident a fixed sum free of Indian tax, the deduction has to be computed by grossing the payment up, so the tax is calculated on a larger figure than the one you agreed to pay. Net-of-tax clauses signed without pricing that in are a recurring source of unbudgeted cost. Read the tax clause before the commercial terms are settled. Once the contract is signed, the deduction obligation follows what was promised rather than what was intended.
How do I reduce a deduction computed on the whole payment?
Section 195 is computed on the sum chargeable, which in many cases means the whole consideration rather than the margin inside it, and the fix is an advance one. Either the payer or the recipient can go to the tax authority before the payment and ask for a determination of the rate or amount that should be deducted, and a certificate authorising a lower deduction is what the bank and the payer then rely on. Raised after the money has moved, the same argument becomes a refund claim in the recipient's hands, which takes far longer and is harder to evidence.
How do I reduce withholding tax on a cross-border payment?
Before the payment, not after. Where a treaty gives a lower rate, the payer needs your residency declaration in hand to apply it; where the statutory rate would over-withhold on a gross amount, an advance application can authorise a reduced deduction on a net or estimated basis. Once the money has moved at the full rate, your remaining route is an elective return or a refund claim, which recovers the same cash far more slowly. See withholding refund and recovery.
What is a permanent establishment, and how easily do we create one?
A taxable presence in another country under the treaty — typically a fixed place of business such as an office, branch, factory or workshop, or a dependent agent habitually concluding contracts on your behalf. Some treaties add a services test measured in days. Purely preparatory or auxiliary activity is excluded, but that carve-out is narrower than it sounds: one senior employee working from home in the other country, with authority, has been enough. See business profits and permanent establishment.