Learn how Series 27 tests customer and PAB classifications, reserve formulas, credits, debits, and allocation logic.
This section is one of the biggest scoring opportunities on the exam because it forces candidates to classify balances correctly before they calculate anything. Series 27 expects the FINOP to know how customer reserve and proprietary account of a broker-dealer reserve computations work, which accounts belong in which formula, how stock-record allocations matter, and why unsecured or aged items can change the result.
The hard part is usually not arithmetic by itself. It is deciding whether an item is customer, PAB, noncustomer, excluded, unsecured, partly secured, or improperly aged. Once the classification is wrong, the computation is wrong. That is why the best study pattern is to separate the process into stages: identify the account type, decide how the balance is treated, then decide whether it creates a credit, a debit, or no line item at all.
Reserve questions are really control questions. Series 27 expects you to notice concentration risk, stock-record breaks, and account-designation problems because a reserve problem often starts with a coding or collateral problem rather than with the formula itself. When a question mentions Regulation T, reserve frequency, or stock-record allocation, it is usually testing whether you can protect the integrity of the computation before trying to total it.
| Step | Question to ask | Why it matters |
|---|---|---|
| 1 | Is the balance customer, PAB, or outside the relevant formula? | Using the wrong population ruins the entire computation. |
| 2 | Is it properly secured, partly secured, unsecured, aged, or excluded? | Treatment depends on collateral quality and status. |
| 3 | Does it create a credit, a debit, or no reserve-formula effect? | Direction matters before arithmetic matters. |
| 4 | Does the stock record or concentration profile change the treatment? | Coding and allocation errors can distort the reserve result. |
[ \text{Required Reserve Deposit} = \text{Credits in the Formula} - \text{Debits in the Formula} ]
[ \text{Excess Debit or Unsecured Portion} \rightarrow \text{Potential reduction in debit treatment or added reserve pressure} ]
The exam does not reward blind memorization of line items. It rewards correct classification of the balance before it reaches the formula.
flowchart TD
A["Start with the account or balance"] --> B["Classify it as customer, PAB, or outside the formula"]
B --> C["Determine whether it is secured, partly secured, unsecured, aged, or excluded"]
C --> D["Assign credit, debit, or no reserve impact"]
D --> E["Check stock-record allocation and concentration issues"]
E --> F["Complete the reserve computation"]
Once this sequence is clean, the formula becomes much less intimidating. Most reserve questions are lost before the addition and subtraction even start.
A FINOP is preparing a reserve computation and notices that a balance may be partly unsecured and may also be coded to the wrong account population. What is the best next step?
A. Put the item into the formula using its current coding and adjust later if needed
B. First determine whether the item belongs in the customer or PAB population and whether its secured status changes its treatment before assigning a debit or credit effect
C. Ignore the coding issue because the reserve formula will offset it automatically
D. Treat every receivable as a debit item if it appears on the firm’s books
Correct answer: B. Series 27 is testing classification discipline. The reserve result is only reliable if the population and secured-status treatment are correct first.