Invoicing Resources & Guides
Free expert guides to help you invoice professionally and get paid faster.
Late Payment Interest Calculator UK
Free calculator for statutory interest and compensation. Understand your rights under the Late Payment Act 1998.
CIS Invoicing Guide for Subcontractors
Complete guide to Construction Industry Scheme invoicing. Deduction rates, labour vs materials, and compliant invoices.
Reverse Charge VAT for Construction
When and how to apply domestic reverse charge VAT. Required wording, examples, and common mistakes.
Mixed VAT Rates on Invoices
How to invoice with different VAT rates. Standard, reduced, and zero rate explained with examples.
How to Enable Advanced Invoicing
Step-by-step guide to enabling CIS, late payment interest, reverse charge, and mixed VAT in Experi.
Proforma Invoice vs Tax Invoice
Understanding when to use each type and their legal implications for VAT in the UK.
Simplified VAT Invoices (Under £250)
Rules for simplified invoices on small sales. What's required and when you can use them.
Retention in Construction UK
Complete guide to retention payments. Understand rates, release periods, and how to protect your cash flow.
Staged Payments in Construction
How to structure progress payments on building projects. Interim invoicing and cash flow management.
Accessibility at Experi
Our commitment to WCAG 2.2 accessibility. Learn about the features we've implemented and our ongoing work to make Experi accessible to everyone.
What is E-Invoicing? UK Guide (2026)
Complete guide to e-invoicing, Peppol networks, and upcoming UK/EU compliance requirements. Future-proof your business.
How to Write an Invoice in the UK
Complete step-by-step guide to writing professional invoices. Master UK requirements, formatting, and get paid faster.
Quote vs Invoice vs Receipt: What's the Difference?
Understand the three essential business documents. Learn when to use each and avoid costly mistakes.
Why Clients Don't Pay on Time
Discover the real reasons behind late payments and practical solutions to get paid faster.
Do I Need to Register for VAT?
Complete guide to VAT registration thresholds, when it's compulsory, and when voluntary registration makes sense.
Best Free Invoice Tools in the UK
Honest comparison of free invoicing software for UK businesses. Features, limitations, and which tool is right for you.
Common Invoicing Mistakes
15 costly invoicing errors and how to avoid them. Stop losing money to simple mistakes.
How to Systemise a Small Business
Transform your chaotic business into a streamlined operation. Practical systems for invoicing, clients, and workflow.
How to Invoice as a Sole Trader in the UK
Complete guide to invoicing as a sole trader, including legal requirements, what to include, and how to get paid faster.
What Should an Invoice Include UK
Detailed breakdown of all required and optional elements for UK invoices, with examples and templates.
How to Chase an Invoice Politely (and Still Get Paid)
Chase overdue invoices politely without damaging relationships. Example emails, phone scripts, and when to escalate.
How to Chase an Unpaid Invoice Professionally
Professional guide to following up on overdue invoices without damaging client relationships.
Invoice Payment Terms Examples (Net 7/14/30)
Complete guide to payment terms. Learn about Net 7, Net 14, Net 30, and other common terms with examples.
Do I Need to Include VAT on Invoices?
Understanding VAT requirements for UK invoices. When you must charge VAT, registration thresholds, and compliance.
Invoice Numbers: Do They Have to Be Sequential?
UK invoice numbering rules explained. Learn HMRC requirements, best practices, and how to avoid mistakes.
Invoice Template vs Invoicing Software
Compare free templates with professional software. Discover which option saves time and helps you get paid faster.
How Often Should Freelancers Invoice
Learn the best invoicing frequency for your business type, from weekly to milestone-based billing strategies.
Free Templates & Resources
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