Startup Burn Rate & Runway Calculator
✓ Verified for 2026/27Cash & Burn Figures
£
£
£
Months of Runway
10.0 months
until bank cash runs out
Monthly Net Burn
£10,000
net cash decrease per month
Current Cash Balance
£100,000
liquid assets
Monthly Cash Outflow
£25,000
total monthly spend
Runway Analysis
Total Cash Balance
£100,000
Monthly Net Burn
£10,000
Estimated Days of Runway
304 days
Cash
90%
Net Burn
10%
Net Burn Rate is the rate at which a startup loses money in a negative cash flow situation. Runway is the amount of time (usually expressed in months) that a business has before it runs out of cash, assuming revenue and expenses remain constant.
Verified for Accuracy (2026/27 Tax Year)
Fact-checked and audited by David Vance, CTA FCA, Chartered Tax Advisor & Accountant. Verified against official HMRC rules.How We Calculated This
- Input variables: Enter the relevant amounts, rates, or percentages in the form.
- Real-time breakdown: The calculator applies HMRC rules and thresholds for the 2026/27 tax year to process the values.
- Display outputs: The visual graphs, donut charts, and tables are compiled dynamically to show your net take-home and deductions.
Real-World Examples
Standard Scenario
A basic calculation applying standard UK tax bands and allowances.
Calculation runs based on standard HMRC rules.
With Pension or Deductions
Factoring in a percentage of salary sacrifice or pension contributions.
Deductions are calculated and adjusted accordingly.
Frequently Asked Questions
Is this calculator updated for the 2026/27 tax year?
Yes, all calculators are fully updated with the latest HMRC thresholds, personal allowances, and National Insurance rates for 2026/27.
Can I use this for official tax submissions?
These tools are for estimation and illustrative purposes only. For official tax returns, please consult a qualified accountant or reference HMRC directly.
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About This Calculator
This calculator uses the latest HMRC rates for the 2026/27 tax year. For illustrative purposes only — always consult a qualified tax adviser for formal advice.