Whats included at launch
Professional PDF invoices
Customer database & search
Revenue dashboard
Full UK VAT support
Estimated tax on earnings
Company logo & branding
Tier:
MVP — launch
Version 2
Future
Complexity:
Low
Medium
High
Invoice management
| Feature | Why users want it | Tier | Complexity | Launch |
|---|---|---|---|---|
| Create invoices | Core reason to sign up — instantly generate HMRC-compliant invoices for clients. | MVP | Low | |
| Edit invoices | Correct amounts, dates, or descriptions before or after sending. | MVP | Low | |
| Duplicate invoices | Most freelancers bill the same clients repeatedly — one click to copy saves minutes every month. | MVP | Low | |
| Invoice numbering | Sequential numbers are required for VAT-registered businesses and look professional to all clients. | MVP | Low | |
| Draft invoices | Save work-in-progress without accidentally sending to clients. | MVP | Low | |
| PDF export | Clients expect a PDF — without export, users cant actually send invoices. | MVP | Medium | |
| Company logo upload | Transforms a plain document into a branded invoice. | MVP | Low | |
| VAT support | Millions of UK businesses are VAT-registered — essential for a large portion of the market. | MVP | Medium | |
| Invoice status | Draft, Sent, Paid — essential for chasing overdue payments and managing cash flow. | MVP | Low |
Customer database
| Feature | Why users want it | Tier | Complexity | Launch |
|---|---|---|---|---|
| Add customers | Without a customer list, users re-type the same address every invoice. | MVP | Low | |
| Store company details | Name, address, VAT number — required fields on every invoice. | MVP | Low | |
| Store contact details | Email and phone on file for following up on unpaid invoices. | MVP | Low | |
| Customer notes | Payment terms, special rates, relationship notes — not essential at launch. | Version 2 | Low | |
| Search customers | Once a user has 10+ clients, scrolling is painful — a critical usability feature. | MVP | Low | |
| Customer invoice history | See all invoices per client — helps with chasing and spotting top customers. | MVP | Low |
Quotes & estimates
| Feature | Why users want it | Tier | Complexity | Launch |
|---|---|---|---|---|
| Create quotes | Freelancers need to send quotes before work starts — uses the same data as invoices. | Version 2 | Medium | |
| Convert quote to invoice | Avoids re-entering data when a quote is accepted — a major time-saver. | Version 2 | Medium | |
| PDF export for quotes | Same requirement as invoices — reuses the invoice PDF code so effort is low. | Version 2 | Low |
Business dashboard
| Feature | Why users want it | Tier | Complexity | Launch |
|---|---|---|---|---|
| Total invoices sent | A single number showing business activity — gives users a sense of progress. | MVP | Low | |
| Total customers | Quick overview metric — low effort to add alongside invoice count. | MVP | Low | |
| Revenue summary | Billed, paid, outstanding — essential for understanding cash flow. | MVP | Low | |
| Recent invoices | Shortcut to the last 5–10 invoices for quick follow-up on outstanding payments. | MVP | Low | |
| Recent customers | Quick access to recently used clients for faster invoicing. | MVP | Low |
Tax calculator integration
| Feature | Why users want it | Tier | Complexity | Launch |
|---|---|---|---|---|
| Links to UK tax calculators | TaxCalc UK already has calculators — linking makes it a one-stop tool and drives traffic. | MVP | Low | |
| Estimated tax on earnings | Income Tax and NI estimate from invoiced revenue — the core value proposition. | MVP | Medium | |
| VAT calculator access | Quick gross/net check while invoicing — low effort, high value. | MVP | Low |
User account
| Feature | Why users want it | Tier | Complexity | Launch |
|---|---|---|---|---|
| User registration | Email + password — minimum viable auth. | MVP | Low | |
| User login | Secure session management — non-negotiable. | MVP | Low | |
| Profile management | Update email or password — absence would cause support requests. | MVP | Low | |
| Business info settings | Name, address, VAT number, logo — pre-fills every invoice. | MVP | Low |
Nice-to-have features
| Feature | Why users want it | Tier | Complexity | Launch |
|---|---|---|---|---|
| Email invoice from platform | Removes the PDF download step — very popular but complex to implement. | Version 2 | High | |
| Recurring invoices | Subscription/retainer clients expect automatic monthly invoices. | Version 2 | Medium | |
| Expense tracking | Useful for tax calculations but significantly larger scope — risks complexity. | Future | High | |
| Invoice templates | Custom colours and fonts — logo upload covers the essentials at launch. | Version 2 | Medium |
Recommended minimum MVP
The smallest build genuinely worth £9.99/month
The goal is a product a sole trader or freelancer would pay for on day one, without needing a tutorial. Three core jobs: create invoices, track who owes money, and know how much tax to set aside. Everything else can wait.
Build this first
- Accounts: register, login, business settings, logo upload
- Customers: add, edit, search, view invoice history
- Invoices: create, edit, duplicate, number, draft/send/paid status
- VAT: standard, reduced, zero-rated, VAT number on invoice
- PDF: branded with logo, all line items, VAT breakdown
- Dashboard: revenue, outstanding, paid, recent invoices & customers
- Tax estimate: Income Tax & NI from invoiced revenue
Version 2 (post-launch)
- Email invoice directly from the platform
- Quotes & estimates with convert-to-invoice
- Basic recurring invoices
- Invoice templates & colour themes
- Customer notes & more granular tax breakdowns
Not in scope
- Payment processing
- Accounting integrations (Xero, QuickBooks)
- CRM / pipelines
- Expense tracking
Why this MVP justifies £9.99/month — A sole trader sending 5–10 invoices a month saves 30–60 minutes of admin — worth more than £9.99 at any hourly rate. Add a built-in tax estimate (a feature no basic invoicing tool provides) and you have a clear, unique reason to subscribe.
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