SOC 2, ISO 27001 or DPDP: which one does your deal actually need?

Ask five advisors and you will get five answers, all of them "yes, and also the other two". That is expensive advice. These three things are not alternatives to each other — they answer different questions, asked by different people, for different reasons.

They are not the same kind of thing

• SOC 2 is an attestation. A licensed accounting firm examines your controls and writes a report about what it found. There is no certificate and no pass mark — the buyer reads the auditor's opinion and the exceptions.
• ISO 27001 is a certification. An accredited body audits your information security management system against an international standard and issues a certificate with an expiry date.
• The DPDP Act is a law. You do not get certified against it; you either comply or you are exposed. It applies because of where your users are, not because a customer asked.

Conflating them is what produces the "get all three" advice. A law is not a sales asset and a sales asset is not optional compliance.

Which one your buyer is actually asking for

In practice the answer is determined almost entirely by who is buying:

• A US enterprise, especially in tech or financial services — SOC 2 Type II. It is the default in that market and their vendor-risk process is usually built around it.
• A European or UK buyer, or a multinational — ISO 27001. It travels better internationally and is more often the named requirement outside the US.
• Any buyer whose end users are in India, including Indian enterprises — DPDP compliance, regardless of what else you hold. This one is not negotiable by the buyer because it is not theirs to waive.
• A regulated Indian entity — sectoral rules on top: RBI's framework for banks and regulated financial entities, SEBI's CSCRF for securities-market entities.

If you sell only to US software companies, ISO 27001 is a large amount of work that will rarely be asked for. If you sell across the US and Europe, doing ISO 27001 first and mapping it onto SOC 2 later is usually cheaper than the reverse.

Type I and Type II, and why the distinction costs you a quarter

SOC 2 comes in two flavours and founders routinely budget for the wrong one. A Type I report says the controls were designed appropriately at a single point in time. A Type II says they operated effectively across an observation window — typically three to twelve months.

Enterprise buyers overwhelmingly want Type II, which means the calendar, not the work, is usually your binding constraint. You cannot compress an observation window. This is the single most common reason a compliance project misses the deal it was started for, and it is entirely avoidable by starting the window early — the controls do not have to be perfect on day one of the window, they have to be running.

What actually unblocks the deal while you wait

None of the above helps the deal that is stuck this month. What does help, in rough order of how often it works:

• Evidence the controls exist and are working — findings, dated, with the tool that produced them and the control each affects. This is what an auditor will ask for anyway, so it is never wasted work.
• A recent penetration test report. Frequently a hard requirement, and unlike an audit window it can be produced in weeks.
• A trust page a buyer's security team can read without emailing you, covering your subprocessors, data residency, encryption and incident commitments.
• A named human who owns security and will sign things. Buyers are assessing whether anyone is actually accountable, and an org chart with a real name on it does more than most founders expect.
• A credible audit date. "Type II window opens in March, report expected in September" is a far better answer than silence, and buyers regularly proceed on it with a contractual commitment.

The pattern is that buyers are managing risk, not collecting documents. A vendor who can show what is true today and name what is coming is a manageable risk. A vendor who cannot answer is not, whatever certifications they eventually hold.

The cheapest order

Fix what is visible from the outside. Get the evidence into a form you can hand over. Get a penetration test if a review is already blocking revenue. Open the audit window as early as you can stand, because that clock is the one thing money cannot speed up. Add the second framework only when a real buyer asks for it by name.

Doing it in that order means every step is useful to a deal in flight, rather than a nine-month project that produces nothing until the day it finishes.