SOC 1 audits for services that shape your customers’ financials.

SOC 1 stands for System and Organization Controls 1, a reporting framework the American Institute of CPAs built for service organizations whose work flows into their customers’ financial statements. If you run payroll, move payments, host the ledger, or process claims for other companies, the numbers you produce end up in someone else’s books. A SOC 1 audit examines the controls behind those numbers and reports on whether they can be trusted.

The examination follows SSAE 18, the attestation standard that governs these engagements (specifically the section auditors cite as AT-C 320). The heart of it is a set of control objectives you define — things like "payroll is calculated and disbursed only from authorized, complete data" — and the controls you rely on to meet each one. A licensed CPA firm tests those controls and issues an opinion your customers’ auditors read before they sign off on their own financials.

Think about what happens when you do not have one. Every customer whose auditor relies on your service faces a choice: trust your numbers on faith, or send their own team to test your controls one client at a time. A SOC 1 solves that by letting a single independent CPA firm test your controls once, so every user auditor can rely on the same document. That is why the framework exists.

The distinction that matters most: SOC 1 is about internal control over financial reporting, not data security in general. A SOC 2 asks whether you keep data safe; a SOC 1 asks whether the financial figures your service produces are complete, accurate, authorized, and processed the way your customers assume. That focus on the balance sheet and income statement is what separates it from every other SOC report, and it is why the audience for a SOC 1 is almost always a group of accountants rather than a security team. Your control objectives read like assertions an auditor would make about a financial process, because that is exactly what they are.

You need a SOC 1 when your service affects how your customers report their own financial results, and their auditors have to account for that reliance. A few clear cases come up again and again:

• Payroll processors. You calculate wages, taxes, and withholdings that land directly in a client’s payroll expense and liabilities. Their auditor cannot ignore that.
• Payment and transaction processors. You capture, settle, or reconcile money that becomes revenue and cash on someone’s balance sheet.
• SaaS platforms that carry financial data. If your billing, revenue-recognition, or accounting software produces the figures a customer books, their auditors will look to your controls.
• Claims and benefits processors. You adjudicate and pay amounts that flow into an insurer’s or plan sponsor’s financial statements.
• Data-center and hosting providers. When you host the systems that run a client’s financial applications, your access, change, and operations controls become part of their control environment.
• Fund administrators and loan servicers. You calculate net asset values, allocate interest, or track balances that appear directly in an investor’s or lender’s statements.

The trigger is almost always the same. A customer’s auditor sends a request, or the customer forwards a vendor questionnaire, asking for your SOC 1 report. Without one, that auditor has to test your controls themselves, which is slower and more intrusive for everyone. As you sign larger clients, especially public companies and regulated firms, the requests multiply, and answering each one individually stops being realistic.

Timing catches people out more than anything else. A Type II report has to cover a period, and you cannot manufacture history after the fact. If a customer’s year-end is December and their auditor wants a report covering January through December, you need your controls running and documented from the start of that window, not scrambling to reconstruct evidence in January of the following year. The organizations that handle SOC 1 smoothly are the ones that start a full period before anyone formally asks. When a deal hinges on the report and there is no time to cover a full period, we sequence a Type I first to show design is sound, then a Type II to cover the operating stretch.

This is the question we field most often, usually because a customer asked for "a SOC report" without saying which one. The answer comes from who is asking and why. If the request comes from a customer’s finance function or their financial-statement auditor, and the concern is whether your service produces reliable numbers, you need a SOC 1. If the request comes from a security, procurement, or risk team worried about how you protect data, you need a SOC 2.

The two are not interchangeable, and one does not cover the other. A SOC 1 tests control objectives tied to financial reporting: completeness of processing, accuracy of calculations, authorization of transactions, and the IT general controls that keep those processes reliable. A SOC 2 tests the Trust Services Criteria: security, availability, processing integrity, confidentiality, and privacy. A payroll processor can have a spotless SOC 2 and still owe its clients a SOC 1, because keeping data secure says nothing about whether the payroll math is right.

Plenty of service organizations need both, and the same customers sometimes ask for each on behalf of different internal teams. When that happens, we scope the two examinations together so the overlapping IT general controls — access management, change control, and operations monitoring — are tested once and reflected in both reports. You get two documents, each pitched at its own audience, without paying to build the same evidence twice.

You receive a complete SOC 1 report, and it is worth knowing what sits inside it before the first draft lands. The report opens with the independent CPA opinion, the part your customers’ auditors turn to first, followed by your management assertion. Then comes a description of your system: what the service does, the transactions it processes, the people and technology behind it, and the control objectives you have committed to. For a Type II, the bulk of the document is the detail of every control we tested, the tests we ran, and the results, including any exceptions we found and what they mean.

The report also lists complementary user entity controls, the things your customers must do on their end for the whole system to work as intended. A payroll processor, for instance, depends on the client submitting complete and authorized input. User auditors look for that section closely, because it tells them which controls sit with you and which sit with their own client. A report without it reads as unfinished, and we build it in from the start rather than bolting it on at the end.

Timing depends on where you begin. A Type I can often be issued within a few weeks once your controls are designed and documented, which makes it a sensible first step when you have never had a report and a deal is waiting. A Type II adds the observation window on top, commonly 6 to 12 months, because the opinion has to cover controls actually operating over that stretch. Most organizations settle into an annual rhythm, refreshing the Type II each year so their customers always have a current report that lines up with their own audit cycle. When a customer’s auditor needs something before your first full period closes, we issue a Type I now and schedule a Type II covering the following period, so you are never left with nothing to hand over.

The framework is the same everywhere, but the control objectives that matter change with what you do. A few of the patterns we see most often:

Payroll processors. Your control objectives center on completeness and accuracy of the payroll run: that input data is authorized and complete, that gross-to-net calculations and tax withholdings are right, and that disbursements go only to the correct parties on schedule. A single systematic calculation error ripples straight into every client’s payroll expense, which is why user auditors read these reports carefully.

Payment and transaction processors. Here the objectives track money as it moves: transactions are captured completely, authorized properly, settled to the right accounts, and reconciled so nothing is lost or double-counted. Because the amounts you handle become cash and revenue on a customer’s balance sheet, the reconciliation and cutoff controls tend to draw the most scrutiny.

SaaS billing and financial platforms. When your software calculates invoices, recognizes revenue, or maintains the sub-ledger a customer books from, your objectives cover the accuracy of those calculations and the IT general controls beneath them — access, change management, and data integrity. Get the general controls right and the application controls above them become far easier to defend.

SOC 1 sits at the intersection of controls and financial statements, and that is exactly where a licensed CPA firm earns its keep. Because we audit financial statements as well as controls, we write control objectives that a user auditor recognizes and accepts, and we catch the places where a control gap would actually distort a customer’s numbers. A security-only shop can describe your systems; it cannot always tell you which control failures matter to a balance sheet.

You also get a senior auditor who stays on your file, fixed scope you can budget against, and a delivery model that keeps the work moving across time zones. We map your SOC 1 controls once so the overlapping evidence carries into your SOC 2 examination or your customers’ SOX testing, instead of building the same proof twice. The opinion carries the signature of a licensed US CPA firm, which is what makes it something another auditor can rely on.