Discounted Payback Formula Excel

What this does

Payback is the time taken for an investment to return its own cost in cash. The even-flow case is one division. The uneven case needs a cumulative column: read off the last year that is still negative, then add the fraction of the following year needed to close the remaining gap. Neither version discounts the flows, which is the method's main limitation and the reason a discounted variant exists. Keep the inputs visible and clearly labelled and the whole thing stays auditable — anyone who opens the file later, including you, can see at a glance exactly what feeds the result and change one assumption without hunting through the formula. Treat “discounted payback formula excel” as a small repeatable workflow rather than a one-off click you hope to remember next time. Use a small test block before the live file, so any surprise in the affected formula shows up while it is still harmless. When a formula is involved, keep the inputs labelled beside it, reference cells instead of typing values, and apply number formatting only after the result checks out. That turns a calculation you can defend to a CFO or an auditor into a method you can reuse, explain, and defend when the workbook leaves your screen.

A worked example

An outlay of 48,000 returns 15,000 a year: =ABS(B2)/C2 gives 3.2 years. With uneven flows of 12,000, 14,000, 13,000 and 14,000, the cumulative column stands at -9,000 after three years, so payback is 3 + 9,000/14,000 = 3.64 years. Payback is the number a committee asks for first because it is the one everyone understands, and its blind spots are only safe if you can name them. One habit worth forming early: name the cells that hold your inputs, so the formula reads in plain language instead of a string of cell addresses. A reviewer — or you in three months — can then follow the logic without decoding what B7 and D2 were supposed to mean, which is most of what makes a sheet maintainable.

In Google Sheets

Everything above works in Google Sheets too. Excel and Sheets share the formula syntax used here; only the surrounding menus are arranged differently. That portability is deliberate — learn it once and it follows you between the two tools and across Windows and Mac. Keep this page bookmarked for the next time the same question comes up. Better still, repeat the steps once in your own workbook — doing it yourself is what turns a copied answer into something you remember. Treat “discounted payback formula excel” as a small building block rather than a chore. Once the inputs sit in their own cells and the formula reads from them, the same setup answers a dozen related questions with a tweak, and Excel keeps every dependent figure current as the data changes. The tool above is there so you can rehearse and verify before committing anything to a real workbook; the steps and worked example are there so the logic sticks. Get it right once and it stops costing you time — it starts saving it, every time the question comes back around.

Common mistakes

• Using accounting profit rather than cash flow, which ignores that depreciation is not a payment.
• Ranking projects on payback alone, which is blind to everything that happens after the break-even point.
• Mixing signs so the cumulative column never crosses zero.
• Reporting undiscounted payback for a long project, where money returned in year six is treated as worth the same as money spent today.

Frequently asked questions