---
title: "What Is Loss Ratio?"
term: "Loss Ratio"
description: "Loss ratio is the proportion of claims or losses paid relative to premiums collected — a core metric in insurance and insurtech — or more broadly, the share of capital lost on failed investments in a portfolio context."
date: 2026-07-25T00:00:00.000Z
updated: 2026-07-25T00:00:00.000Z
topics: ["venture-capital"]
source: https://venturecapitaltracker.com/glossary/loss-ratio
---

# What Is Loss Ratio?

> Loss ratio is the proportion of claims or losses paid relative to premiums collected — a core metric in insurance and insurtech — or more broadly, the share of capital lost on failed investments in a portfolio context.

**Loss ratio** most often means claims divided by premiums in insurance — but venture investors also use the phrase for how much of a portfolio goes to zero.

## How it works

**Insurance:** Loss ratio = incurred losses / earned premiums. Combined with expense ratio yields combined ratio — below 100% suggests underwriting profit before investment income. Insurtech startups report loss ratio by cohort and geography.

**Venture:** Informally, if a fund makes 30 investments and 15 return 0x, half the deals "lost" capital — but winners may still drive fund return via power law.

## Why it matters

- **Founders:** Insurtech pitches need credible loss ratio paths and reinsurance strategy. Do not confuse GAAP accounting with underwriting loss ratio.
- **Investors:** Insurance: worsening loss ratio without pricing fixes is fatal. VC: expect high deal-level loss counts if a few outliers return the fund.

Insurtech startups should segment loss ratio by product line and underwriting year — blended ratios hide deteriorating new business. Reinsurance treaties cap tail risk but add cost and complexity.

In VC portfolio reviews, "loss ratio" language is informal — use MOIC distribution and write-off counts for precision.

## Common mistake

Using the same term across insurance and VC conversations without clarifying which definition you mean.

## Practical takeaway

Define which "loss ratio" you mean in every conversation — insurance underwriting versus venture write-off rates. Precision prevents mismatched expectations between founders and investors in insurtech or fund discussions.

## Related ideas

- Combined ratio and insurtech metrics
- Power law and fund concentration
- Underwriting cycle

## FAQ

### What is Loss Ratio in simple terms?

In insurance, loss ratio equals incurred claims divided by earned premiums — a 60% loss ratio means 60 cents of every premium dollar went to claims. In VC slang, loss ratio can mean percent of deals that returned less than 1x.

### Why does Loss Ratio matter?

Insurtech investors underwrite loss ratio trends by line of business. Fund LPs ask how many deals can go to zero before the fund fails — power-law math, not insurance accounting.


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Source: https://venturecapitaltracker.com/glossary/loss-ratio