BlueInvoice Blog Overview

Browse all articles and tutorials in one overview.

Overdue invoice with a highlighted missed due date representing late payment and its effect on business cash flow
May 21, 2026 · 8 min

Past Due Invoice Meaning: When Your Invoice Becomes Overdue

A past due invoice is any invoice that has not been paid by its agreed payment deadline. The moment that due date pass… Read more

Illustration of a reverse charge invoice showing the VAT liability shifting from seller to buyer, with key invoice fields including VAT number, zero percent VAT, and reverse charge statement highlighted on a business document
May 18, 2026 · 10 min

Reverse Charge Invoice Requirements: What B2B Sellers Need to Know

A reverse charge invoice shifts the VAT liability from the seller to the buyer, meaning the seller issues the invoice … Read more

Illustration of a calculator character balancing a cancelled invoice and a credit note on a scale
May 15, 2026 · 7 min

What Is a Credit Note and When Do You Need One?

A credit note is a document you send to a customer to cancel or reduce the amount they owe you from a previous invoice… Read more

Illustrated invoice showing detailed line items including consulting, graphic design, and web development services, with a magnifying glass highlighting a billing entry
May 06, 2026 · 8 min

How to Write Clear Invoice Line Items

Invoice line items are the individual rows on an invoice that break down exactly what a client is being charged for, l… Read more

Invoice record keeping workflow from physical document storage to cloud archiving with 7-year financial retention requirements
Apr 29, 2026 · 9 min

How Long Should You Keep Invoices?

Knowing how long to keep financial records is one of those things most freelancers and small business owners put off u… Read more

Professional invoice formatting example showing branded layout with logo, itemized services, and clear payment due date
Apr 24, 2026 · 8 min

Invoice Formatting Best Practices for 2026

Good invoice formatting means your client gets a document that's clear, professional, and easy to act on, which direct… Read more

Illustration of a financial management system showing invoices, payment terms, a calendar, piggy bank, credit cards, coins, and cloud network connected by arrows
Apr 23, 2026 · 7 min

Best Payment Terms for Small Businesses 2026

Payment terms are the rules you set on an invoice that tell your client when and how they need to pay you. Choosing th… Read more

Modern illustration of a professional reviewing a proforma invoice document at a desk with financial charts and business elements in soft focus background.
Apr 20, 2026 · 8 min

Proforma Invoice Format: What to Include and When to Use One

A proforma invoice format is a preliminary document sent to a buyer before a sale is finalized, outlining what goods o… Read more

Apr 10, 2026 · 8 min

Invoice Automation: Save 5 Hours Per Week in 2026

If you're spending hours each week chasing down invoice approvals, manually entering payment details, or re-sending th… Read more

Modern illustration showing interconnected European maps and digital documents flowing across a bright, professional workspace representing EU e-invoicing compliance requirements.
Mar 30, 2026 · 9 min

EU E-Invoicing Mandates 2026: Which Countries Require It and When

If you sell goods or services across EU borders, understanding EU e-invoicing requirements by country is no longer opt… Read more

Modern illustration comparing free and paid invoice software options with balanced scales, digital elements, and professional workspace aesthetic.
Mar 23, 2026 · 8 min

Free Invoice Generator vs. Paid Software: What Do You Actually Need?

The debate around free invoice generator vs paid software is one that trips up a lot of freelancers and small business… Read more

A professional holding a smartphone with an invoice displayed on screen, surrounded by floating digital elements representing mobile invoicing and payments in a modern workspace.
Mar 18, 2026 · 8 min

How to Invoice Clients From Your Phone in 2026 (No App Download Needed)

The ability to use a mobile invoicing app - or skip the app entirely - has changed how freelancers and small business … Read more