YoYYear-over-Year Growth
Year-over-year (YoY) growth compares a metric in the current period to the same period 12 months prior, eliminating seasonal fluctuations. It is the standard benchmark for measuring real business growth.
What is YoY?
YoY growth = ((Current Period Value − Prior Year Period Value) ÷ Prior Year Period Value) × 100. If revenue in Q3 this year is $420,000 and Q3 last year was $310,000, YoY growth is 35.5%. Measuring growth YoY (rather than month-over-month) removes seasonality bias — a 40% drop in January revenue vs. December is meaningless for a gift-product brand; a 40% drop in January vs. last January signals a real problem.
YoY is the primary benchmark for investor, acquirer, and lender conversations. A business growing 40% YoY is valued very differently from one flat or declining. For businesses being sold through Amazon FBA acquisition, trailing 12-month (TTM) revenue and the YoY growth rate are the two figures brokers lead with — growth rate is a multiplier on valuation.
Key YoY metrics to track: Revenue YoY, Units Sold YoY, AOV YoY, Net Profit Margin YoY (is margin expanding or contracting as you scale?), and CAC YoY. A brand growing revenue 50% YoY but with CAC increasing 80% YoY is growing unsustainably — the unit economics are deteriorating.
Why it matters for sellers
YoY growth is how investors, acquirers, and partners assess trajectory. A brand doing $800k/year growing at 55% YoY is worth far more than a brand doing $1.2M/year growing at 5% YoY. Understanding your YoY metrics is also how you spot whether underlying business health is improving or deteriorating beneath surface-level revenue growth.
How to use YoY
Track these 5 YoY metrics monthly: revenue, units sold, AOV, net profit margin, and advertising spend as % of revenue. Build a simple dashboard comparing current month to the same month last year for each metric. When any metric's YoY trend flips negative (e.g., net margin starts declining YoY), investigate root causes before it compounds.
For businesses approaching a sale, prepare a 24-month P&L showing revenue, COGS, advertising, and net profit monthly — YoY growth is immediately visible. Buyers pay 2.5–4× annual net profit, with multiple expansion for businesses demonstrating consistent double-digit YoY growth.
Real-world example
An Amazon brand reviews their annual P&L: Year 1 net revenue $280,000, Year 2 $460,000 (+64% YoY), Year 3 $610,000 (+33% YoY). Revenue growth is strong but decelerating. Net margin Year 1: 22%, Year 2: 20%, Year 3: 17% — declining YoY. Investigation reveals advertising spend as % of revenue has grown from 14% to 22% as competition increased. The YoY margin trend flags a structural issue: the business is growing through advertising investment rather than organic leverage, suggesting a strategy change is needed.
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Frequently asked questions about YoY
What is the difference between YoY and MoM growth?
MoM (month-over-month) measures change vs. the prior month — useful for short-term trend monitoring but distorted by seasonality. YoY compares to the same month last year, eliminating seasonal effects. Use MoM to monitor momentum week-to-week; use YoY to measure real growth trend. A candle brand seeing -60% MoM in January vs. December is normal; if that January is -60% vs. last January, that is a serious signal.
What is a good YoY growth rate for an ecommerce brand?
In the first 1–3 years: 50–100%+ is achievable and expected for brands growing from a small base. Years 3–5: 25–50% is considered strong. Established brands ($5M+ revenue): 15–25% YoY is healthy. Below 10% YoY on a relatively young brand signals market saturation, competitive erosion, or strategic issues. There are no universal benchmarks — compare against your category and stage.
Does YoY growth affect my Amazon listing?
Not directly — Amazon's algorithm doesn't measure YoY growth at the listing level. But the underlying drivers of YoY growth (increasing sales velocity, review accumulation, improving conversion rate, expanding keyword coverage) all strengthen organic rank and account health. YoY growth in Amazon sales is an outcome of consistently executing the right operational inputs.