Financial Metrics · Basic level · 3 min read ·
What is payback or payback period?
The payback period is the time a project's cash flows take to add up to what was contributed at the start. It answers a simple question: in how many years does what you put in come back? It says nothing about what happens after that point, nor about the value of time.
In 30 seconds
- Payback is the point where accumulated flows equal the initial contribution.
- With equal flows each year: payback = contribution ÷ annual flow.
- It doesn't measure what happens after the contribution is recovered, so it is read with ROI and IRR.
Why should you care?
Knowing how long it takes for your contribution to come back helps you choose which money to participate with.
- You see how long your contribution depends on the project's performance before it returns.
- You compare projects with a measure that is easy to explain.
- You plan your finances knowing it is a long, estimated period.
Think of it as filling a bucket drop by drop
The contribution is the size of the bucket and each year's flows are the water dripping in. Payback is the moment the bucket is full. It doesn't say how much water will keep dripping, or whether the drip will ever slow down.
How does the payback period work?
- 1
Start from the initial contribution
That is the target the flows need to reach.
- 2
Accumulate the flows year by year
Add what the project delivers each year to the total of the previous years.
- 3
Find the crossing point
Payback is the year the running total reaches the contribution. If flows are equal, just divide the contribution by the annual flow.
The formula
Payback = Initial contribution ÷ Annual flow (when the flow is the same each year)
- Initial contribution
- = the amount contributed at the start
- Annual flow
- = what the project delivers each year
An example with numbers
Illustrative figures, unrelated to any project: a 1,000,000 peso contribution with flows that grow year by year.
| Initial contribution | 1,000,000 pesos |
|---|---|
| Running total, year 1 (200,000) | 200,000 pesos |
| Running total, year 2 (+300,000) | 500,000 pesos |
| Running total, year 3 (+500,000) | 1,000,000 pesos |
| Payback | 3 years |
By year three the running total equals the contribution. Whether flows continue after that depends on the project's performance, not on the payback.
Where do you see it at Circular Urban?
On solar project sheets, the Financial Models section shows each model's payback. The participation simulator also estimates in how many years the contribution would be recovered, based on the estimated profitability. Both are non-binding reference projections, subject to the project's actual performance.
- Solar project sheets, in Financial Models: Payback.
- Each project's participation simulator.
What changes in your finances once you get it
You use money you won't need soon
If the estimated payback is several years, you participate with resources you won't need in that time.
You weigh a purchase that saves
Solar panels or an efficient appliance: divide what it costs by what it saves each year.
You don't stop at the period
A short payback isn't enough: you also look at what comes after and at the risks.
Common mistakes
- Myth
After the payback point, everything that comes in is a sure result.
- In reality
Later flows are still subject to the project's performance: occupancy, production, prices and costs can change.
- Myth
Between two projects, the shorter payback is always better.
- In reality
A project that pays back fast but ends soon can leave less than one that takes longer and keeps delivering for many years.
- Myth
Payback accounts for a future peso being worth less.
- In reality
Simple payback doesn't: it adds pesos from different years as if they were equal. That is what NPV is for.
Test yourself
You contribute 600,000 pesos and the project delivers 200,000 pesos each year. What is the payback period?
Keep learning
Helps to know first
What comes next
This content is educational. Every participation carries risks inherent to the project, including the possibility of partial or total loss, and results are subject to each project's actual performance.
