Calculators and generators built for sole traders, subcontractors, and small trade businesses. No signup, no account, no hidden fees. Use them right in your browser.
Create a professional UK invoice in 60 seconds. Fill in your details, preview the invoice, and download the PDF. No signup required.
Most popularCalculate statutory interest (8% + base rate) and fixed compensation on overdue invoices under the Late Payment of Commercial Debts Act 1998.
Free calculatorCalculate 20% or 30% CIS tax deductions on labour for UK construction subcontractors. Materials are excluded automatically.
ConstructionCheck if the domestic reverse charge applies to your construction job and calculate the correct invoice amounts.
ConstructionEnter your annual turnover and find out if you need to register for VAT. Current UK threshold: £90,000 (2026/27).
VATCustomer accepted your quote? Convert it into a proper invoice with invoice number, due date, and bank details. Download as PDF.
InvoicingTemplate guides for the common situations WOPA users run into: VAT, sole traders, contractors, builders, cleaners, landlords, and general UK invoices.
The core invoice fields every UK business should get right: numbers, dates, customer details, work, totals, payment terms, and records.
Core templateVAT number, tax point, net amounts, VAT rates, VAT totals, reverse charge notes, and common VAT invoice mistakes.
VATA practical structure for self-employed work, trade jobs, mobile services, due dates, and clean payment records.
Sole tradersDay rates, milestones, project references, purchase orders, expenses, VAT, CIS, and payment terms for contractor billing.
ContractorsConstruction-friendly invoice fields for labour, materials, stage payments, CIS, reverse charge VAT, and retention.
ConstructionInvoice structure for domestic, commercial, recurring, end-of-tenancy, and deep cleaning work.
ServicesRent period, property address, tenant details, arrears, payment references, and property-income record keeping.
Landlords