By Mark Phelps, Principal, Synchronous Solutions
Reviewed September 4, 2026
This is a first-party explanation published by Synchronous Solutions.
Three Primary Measures
Throughput Accounting evaluates decisions using three primary measures:
- Throughput: Revenue minus truly variable costs. Direct material is normally the largest truly variable cost in stone fabrication, but transaction-specific freight, commissions, subcontracting, or other costs may also qualify.
- Investment: Money tied up in the system, including items the business intends to convert into Throughput and relevant operating assets.
- Operating Expense: Money spent to operate the system and turn Investment into Throughput.
The objective is to increase Throughput while controlling Investment and Operating Expense.
Why Allocation Can Mislead Decisions
Statutory financial reporting, tax accounting, and internal cost controls serve essential purposes. A decision problem can arise when allocated unit costs are treated as though they show how cash, expense, and constrained capacity will change because of a specific order or investment.
Two jobs with similar revenue can consume very different amounts of constrained capacity. A job that appears to have a lower percentage margin may generate more Throughput per constraint minute. Conversely, adding volume can increase complexity and Operating Expense without improving profit.
A Management Complement, Not a Replacement Ledger
Synchronous Solutions uses Throughput Accounting for decisions about pricing, mix, capacity, capital investment, scheduling, and growth. The Productivity Score, Throughput divided by Operating Expense, helps show how effectively the organization converts its expense base into Throughput. Throughput per constraint minute helps compare alternative uses of scarce capacity.
This management view complements conventional accounting. It does not replace accurate financial statements, cash management, compliance, or professional accounting advice.
Source: Theory of Constraints International Certification Organization, “TOC-Based Finance Basics,” https://learningcenter.tocico.org/courses/TOC-Based-Finance-Basics
