You hand an investor a 60-page document. The investor smiles politely and drops it in the bin. For an experienced financier, overstated key parameters are a signal that the founder is either naive or dishonest. Here are three numbers that business plans overstate almost without fail.
Key takeaway. An investor is not buying a pretty forecast - they are buying your ability to tell wishful thinking from reality. They spot inflated assumptions within a minute, and lose trust in the entire document.
Number 1. Market growth rate (TAM/SAM/SOM)
How it looks in the business plan: "Our addressable market is growing 45% a year."
How it really is: +5-8%, provided you have entered a genuinely growing niche.
You see that the EdTech market grew 300% during the pandemic and extrapolate that forever. The investor knows: abnormal growth ends, the low base effect fades, and large players eat into your share.
Number 2. Sales funnel conversion
How it looks in the business plan: conversion from lead to payment - 15-25%.
How it really is: 1-5% in B2B and 3-8% in high-ticket B2C.
By overstating conversion, you try to shrink the marketing budget blind spot. The math is simple: if you put conversion at 20%, your CAC (customer acquisition cost) looks good. But in reality a cold B2B client takes 6 months to mature, while a B2C buyer abandons the cart 2 seconds before paying.
Inflated conversion does not make the business more profitable - it simply hides the real cost of a customer until the first month of sales.
Number 3. Retention rate
How it looks in the business plan: LTV is rising, customer churn is 2% per month.
How it really is: 5-10% churn is already an excellent SaaS figure, and in mobile apps it reaches 30-50%.
By overstating retention, you understate the need for constant marketing pressure - that is, you hide future costs without which revenue simply will not hold at the level you claim.
Three assumptions and their real ranges
| Parameter | In the business plan | In reality |
|---|---|---|
| Market growth | 45% per year | 5-8% per year |
| Conversion to payment (B2B) | 15-25% | 1-5% |
| Conversion to payment (high-ticket B2C) | 15-25% | 3-8% |
| Customer churn (SaaS) | 2% / mo | 5-10% / mo |
| Customer churn (mobile) | 2% / mo | 30-50% / mo |
How to back up the numbers
For a business plan to stop being fiction, every inflated assumption must be backed up:
Show that you have studied 5 competitors and their actual conversion figures.
One month of manual sales with real revenue outweighs 50 pages of forecasts.
Test a 30% drop in sales and a 2x increase in CAC.
Conclusion. Investors pay not for predictions, but for the ability to adapt quickly. A business plan in which every number is backed by a market fact beats any pretty deck with numbers pulled out of thin air.
How G-Invest consulting can help
Entrust your business plan to people who know investor requirements from the inside. What we do:
- We build the business plan from scratch. We structure the document to the UNIDO standard with real benchmarks.
- We collect primary data. We work with realistic market data, not extrapolations of "endless growth."
- We build a financial model that withstands scrutiny. Discounted cash flow, scenario analysis, working capital - everything founders usually skip.
A business plan that passes due diligence
We will build you a document to the UNIDO standard: real benchmarks, unit economics and a financial model with DCF and scenario analysis - where every number is backed by a market fact and improves your odds of funding.
Frequently asked questions
Should I show a pessimistic scenario to an investor, or will it scare them off?
You absolutely should. The investor sees that you have accounted for every risk. It does not scare them off - it builds trust and speeds up the decision.
What are the typical mistakes in a startup financial model, and how do you avoid them?
Ignoring seasonality, forgetting working capital, and currency risk. You avoid them by building in scenario analysis and a stress test right at the modelling stage.