The Origin Story
The concept for the Reverse VAT Calculator was born out of frustration in early 2021. This was a pivotal year for the UK construction industry, marked by the introduction of the VAT Domestic Reverse Charge procedure. Almost overnight, thousands of sub-contractors, sole traders, and small construction firms had to completely overhaul how they invoiced their services.
The challenge was simple yet pervasive: standard accounting software and generic calculators were designed to add tax to a net figure. They weren't intuitively designed to work backward from a gross total to find the tax liability. This left many professionals relying on "back-of-the-napkin" math or complex spreadsheet formulas just to send a simple invoice.
We saw seasoned accountants struggling to explain the concept to clients, and tradespeople losing hours to paperwork because their numbers didn't balance by a few pennies due to rounding errors. We realized there was a gap in the digital toolbox for a dedicated, specialized, and highly accurate reverse calculation engine. Thus, RevCalc was created with a single purpose: to extract VAT instantly and accurately, with zero friction.
Our Core Philosophy
Uncompromising Privacy
Financial data is sensitive. We believe you shouldn't have to upload your data to a remote server just to perform a calculation. That's why our entire calculator runs client-side within your web browser. When you type a number into RevCalc, that number never leaves your device. We don't track your inputs, we don't store your history, and we certainly don't sell your data.
Mathematical Precision
Floating-point math in computers can be notoriously inaccurate if not handled correctly. We have engineered our calculation logic to handle decimal precision with the rigor required for financial reporting. We align our rounding methods with HMRC standards, ensuring that whether you are calculating £10 or £10 million, the tax breakdown is legally compliant.
Forever Accessibility
Essential business tools should not be hidden behind paywalls or riddled with intrusive advertisements. We are committed to keeping this tool free and accessible to everyone—from the freelance graphic designer in London to the construction firm in Manchester. Our minimalistic design ensures it loads instantly on mobile networks.
Who We Serve
While our tool is open to everyone, we have tailored our experience for specific sectors that deal with complex VAT requirements daily:
- Construction Industry: For contractors and sub-contractors navigating the CIS Reverse Charge rules who need to separate labor and materials costs from the VAT component.
- Freelancers & Sole Traders: For those who often agree on a "total budget" with clients and need to work backward to determine their actual net income after setting aside tax.
- Retailers & E-commerce: For shop owners who sell goods inclusive of VAT and need to calculate the output tax liability for their quarterly returns.
Looking to the Future
We are not stopping at just a calculator. Our roadmap includes a suite of lightweight financial tools designed to simplify the administrative burden of running a small business. We are exploring API integrations for developers, downloadable widgets for desktop use, and expanded support for international tax regimes beyond the EU and UK.
Our goal is to become the go-to reference point for quick, accurate financial calculations on the web. We are constantly updating our algorithms to reflect the latest government tax changes, ensuring that you never have to worry if your tools are out of date.
Ready to calculate?
Simplify your invoicing workflow today. No spreadsheets, no complex formulas.
Launch Calculator