Startup Valuation Calculator
Calculate pre-money/post-money valuations, equity dilution, and investor returns with SEIS/EIS tax relief factored in.
Equity Split
Exit Scenarios (with SEIS relief)
| Exit Multiple | Exit Value | Investor Gets | Net Return |
|---|---|---|---|
| 2x | £2.3m | £300k | 4.0x |
| 5x | £5.8m | £750k | 10.0x |
| 10x | £11.5m | £1.5m | 20.0x |
| 20x | £23.0m | £3.0m | 40.0x |
Net return = investor payout / effective cost after tax relief. CGT exemption applies if shares held 3+ years under SEIS/EIS.
How Startup Valuations Work
Pre-money valuation is what the company is worth before investment. When an investor puts money in, the post-money valuation = pre-money + investment amount.
The investor's equity percentage = investment / post-money. So £150k invested at a £1m pre-money = £150k / £1.15m = 13.0% equity.
With SEIS tax relief, the investor gets 50% back as income tax relief, so £150k effectively costs £75k. This makes the effective price per % of equity much cheaper — a key reason UK angels favour SEIS-eligible startups.
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