What it means
Standard accounting usually only records transactions when an invoice arrives or when you pay for something. This creates a dangerous blind spot, because you might think you have plenty of budget left while forgetting about orders you placed last week.
Commitment accounting (sometimes called encumbrance accounting) solves this by reserving funds the moment a purchase order is approved. This way, your financial system reflects both money already spent and money spoken for, giving you an accurate picture of what is genuinely left to spend.
For non-finance managers, this practice prevents accidental overspending. If your department has a monthly budget of $10,000 and you issue purchase orders for $8,000 today, commitment accounting immediately shows that your remaining budget is $2,000.
Even though no invoices have been paid yet, those funds are legally or operationally tied up. It is worth knowing that commitments are a budgeting and control tool: they are not normally recorded as expenses or liabilities in the formal financial statements until the goods or services are received.
In practice, this system protects businesses from cash flow crises. Without it, you risk committing to multiple projects simultaneously, only to realise later that your cumulative orders exceed your budget or your expected earnings.
It bridges the gap between making a buying decision and receiving the final bill. Imagine holding a dinner party and telling three friends you will buy their favourite desserts.
Even though you have not paid for them yet, that money is spoken for, and you cannot spend it on drinks.
In practice
Real-world examples
Example 1
A solo entrepreneur issues a $500 purchase order for marketing flyers. Commitment accounting reserves this cash immediately, so the remaining budget is correct before the printer sends an invoice, and the entrepreneur does not accidentally spend the same $500 on something else.
Example 2
A retail business with a few shops signs a $3,000 contract for seasonal window displays. Commitment accounting holds those funds right away, preventing the team from spending that money on new office chairs in the weeks before the invoice arrives.
Example 3
A mid-sized manufacturing firm orders $12,000 of raw materials. Commitment accounting records this future expense immediately, so production managers can see it and avoid ordering duplicate parts, and the finance team can plan cash for the payment date.
Think of it
Imagine holding a dinner party and telling three friends you will buy their favorite desserts. Even though you have not paid for them yet, that money is spoken for, and you cannot spend it on drinks.
Formula
Calculation
Available Budget = Total Approved Budget - (Actual Spent Expenses + Outstanding Commitments)
Worked example. A department has an approved budget of $20,000. It has paid $5,000 in actual bills and has issued $8,000 in active purchase orders.
- Available Budget = $20,000 - ($5,000 + $8,000) = $20,000 - $13,000 = $7,000
Without commitment accounting, the manager would look only at actual spending and believe $15,000 was still available ($20,000 - $5,000). If the manager approved a further $10,000 purchase, the department would end the period $3,000 over budget ($5,000 + $8,000 + $10,000 = $23,000 against $20,000).
When a commitment ends, the entry reverses. If the $8,000 order is later invoiced at $7,600, the $8,000 commitment is released, $7,600 becomes actual spend, and available budget rises to $20,000 - $5,000 - $7,600 = $7,400.Case study
Seen in the real world
This is a fictional, illustrative scenario. Brighton Design Studio, a growing creative agency with twenty staff, struggled with surprise year-end deficits. The managing director noticed that project teams routinely ordered expensive software licences and freelance support without checking remaining funds, leading to sudden cash crunches when invoices arrived weeks later. To fix this, the agency implemented commitment accounting software. Under the new system, whenever a manager issued a purchase order for freelance design work worth $2,000, the system immediately deducted that amount from their departmental budget.
Actual cash did not leave the bank account until the work was completed and invoiced thirty days later, but the funds were protected from other discretionary spending. Within six months, the studio eliminated budget overruns. Project managers gained real-time visibility into their true financial standing, which let them pace hiring and software purchases accurately. The finance team also saved hours of reconciliation work because month-end surprises became rare.
Watch out
Common mistakes
- Assuming that money is available to spend just because no invoice has arrived yet.
- Forgetting to cancel a commitment when a supplier order is changed or cancelled, which leaves budget locked up unnecessarily.
- Failing to train team members on why purchase orders must be logged immediately.
Questions
People also ask
How does commitment accounting differ from traditional accounting?
Traditional accounting records expenses when goods or services are received or bills are paid. Commitment accounting tracks the spend earlier, right when a purchase order is raised or a contract is signed.
Does commitment accounting replace cash flow forecasting?
No, they work together. Commitment accounting shows what you have promised to spend, while cash flow forecasting shows the timing of when the money will leave your bank account.
Why is this important for non-finance managers?
It stops you from spending the same money twice and ensures your department stays within its financial limits throughout the month.