Payback Period Calculator — Simple & Discounted

Payback period answers the simplest question in capital budgeting: “How long until I get my money back?” It’s the first risk filter most CFOs apply — projects with payback > 5–7 years rarely survive without strong strategic justification. The calculator does both simple payback (raw cash flows) and discounted payback (factors in the time value of money).

Payback Period Calculator

How many years until your investment pays itself back? Includes discounted payback for time-value-of-money accuracy.

$
$
Growth5.00%
Discount10.00%

Payback Analysis

Simple Payback Period–
Discounted Payback–
Year-1 Inflow–
Cumulative @ 5 Years–
Cumulative @ 10 Years–

Get a personalised financial report

Drop your email and we’ll send a custom PDF summary tailored to your inputs above — plus weekly tips on investing, taxes, and business finance.

No spam, unsubscribe anytime. We never share your email.
Thanks! Check your inbox in the next few minutes.

Ready to turn knowledge into wealth?

Master investing, business finance & accounting with our structured, expert-led courses.

Explore Our Courses →

Why Payback Period Still Matters

Sophisticated finance prefers NPV and IRR — but practical operators love payback because it’s a liquidity measure, not a profitability measure. A project with high NPV but a 10-year payback ties up capital. A 2-year payback project gives you flexibility, optionality, and the ability to redeploy.

Most successful operators set a hard rule: “No project with payback > 4 years unless it’s strategic.”

Simple vs Discounted Payback

Simple Payback = Year before recovery + (Unrecovered amount / Cash flow that year)
Discounted Payback = Same logic, but discount each year’s cash flow by (1 + r)t

Discounted payback is always longer than simple payback, because future cash is worth less than present cash. The gap between them tells you how much the time-value-of-money is hurting the project.

Worked Example

Example: Buy a CNC machine for $50,000. Year-1 cash inflow $15,000, growing 5% annually. Cumulative at year 3: ~$47,275. Year 4: ~$64,419. Simple payback ≈ 3.16 years. Discounted payback at 10% ≈ 4.0 years. If your hurdle is <4 years, this project clears it on simple but barely on discounted basis — borderline.

Limitations of Payback Period

  • Ignores cash flows after payback. A project with $1M of post-payback NPV looks identical to one with $50K post-payback.
  • Ignores time value of money (in the simple version) — use discounted payback to fix this.
  • No risk adjustment — a 2-year payback in a stable industry beats a 2-year payback in a volatile one, but the metric doesn’t see that.
  • Best used as a screening filter, then NPV / IRR for final decisions.

Frequently Asked Questions

What’s a ‘good’ payback period?▾
Industry-dependent. Software/SaaS marketing channels: 12–18 months. Manufacturing equipment: 3–5 years. Real estate: 8–12 years. Public infrastructure: 15+ years. Compare to your industry benchmark.
Should I use simple or discounted payback?▾
Discounted payback is always more accurate. Use simple payback for back-of-envelope screening; discounted payback for any decision involving real money.
How does payback relate to LTV/CAC in SaaS?▾
CAC payback = Customer Acquisition Cost / Monthly Margin per Customer. Best-in-class SaaS hits 12–18 month CAC payback. > 24 months suggests an unprofitable growth engine.
Should I include depreciation?▾
No — payback is a cash-based metric. Depreciation is a non-cash accounting entry. Use cash inflows only.

Related Calculators

Ready to turn knowledge into wealth?

Master investing, business finance & accounting with our structured, expert-led courses.

Explore Our Courses →
Scroll to Top