Model your complete SaaS P&L — from MRR and gross margin through operating costs — to see when you reach profitability, your burn rate and the levers that most accelerate the path.
| Month | MRR | Gross Profit | Opex | EBIT |
|---|
Most SaaS companies operate at a loss during growth phases — investing in customer acquisition ahead of revenue recovery. Understanding exactly when and at what MRR level you become profitable, and what variables most accelerate that path, is the central financial planning question for any funded SaaS business.
The Rule of 40 (Growth Rate % + Operating Margin % ≥ 40) balances growth with profitability. A company growing 50%/year with -10% operating margin scores 40 — healthy. One growing 20% with 20% margin also scores 40. Below 40 suggests either insufficient growth for the investment level or insufficient profitability for the growth rate. Top quartile public SaaS companies score 50+.
Burn Multiple = Net Burn / Net New ARR. A score below 1.0 is excellent (you are generating more ARR than you are burning cash). 1.0–1.5 is good. 1.5–2.0 is moderate. Above 2.0 means you are burning more than £2 for every £1 of new ARR — high capital consumption that will be scrutinised by investors.
Track runway (months of cash remaining at current burn) monthly. Most investors want to see 18+ months of runway. Raise before 12 months remain — fundraising typically takes 3–6 months. Growth that requires excessive capital relative to ARR generated (burn multiple above 2.0) is increasingly unfavourable in 2026 market conditions versus 2021 highs.
SaaS companies typically reach operating profitability when MRR × Gross Margin exceeds total monthly operating costs. At 72% gross margin and £65,000/month opex: break-even MRR = £65,000 / 72% = approximately £90,000 MRR (£1.08M ARR). Growing at 8% monthly from £50,000 MRR: approximately 8-10 months to reach this level. Most venture-backed SaaS companies plan for 3-5 years to operating profitability while investing aggressively in growth.
Monthly burn rate is the net cash consumed by the business: revenue received minus all cash costs (COGS, salaries, marketing, rent, everything). A £30,000 MRR business with £65,000 operating costs has a gross profit of £21,600 (at 72% GM) and a burn of £43,400/month. With £500,000 in the bank: 11.5 months of runway. Investors track burn rate, runway and burn multiple closely — and will want to see a clear path to positive cash flow.