Guides
Practical guides to invoicing for a small business: the mandatory invoice details, VAT, the most common mistakes and how to start invoicing for free.
18 July 2026 · 4 min
Free invoicing software: how Haimoo Invoice's Starter tier works
How free invoicing works in Haimoo Invoice: three invoices a month with no card, what the paid tier unlocks and when upgrading is worth it.
8 July 2026 · 5 min
Mandatory invoice details: what an invoice must contain
What a compliant invoice must contain in Finland. A clear list of the mandatory invoice details for a small business, with VAT information and practical tips.
8 July 2026 · 5 min
VAT invoice for a small business: how to do it right
How to show value added tax on an invoice correctly. A practical guide for a small business: tax rates, the price without tax, the amount of tax and the most common VAT mistakes.
24 July 2026 · 5 min
Invoice template: a free sample or a real invoice?
What an invoice must contain and what it looks like. Why a free Word or Excel invoice template falls short, and how you make a real numbered invoice with the required fields ready.
24 July 2026 · 6 min
How to make an invoice: a step-by-step guide
How to make an invoice and bill a customer step by step: customer details, invoice lines, VAT, due date and reference, review, sending as a PDF and tracking payment. Your first invoice in a few minutes.
24 July 2026 · 5 min
Light entrepreneur invoicing: an invoicing service or invoicing software?
Light entrepreneur invoicing means two different things: an invoicing service and invoicing software. The clear difference and which one fits you when you invoice on the side or without a business ID.
24 July 2026 · 5 min
Sole trader invoicing: invoicing software for a trade name and freelancer
How a sole trader and freelancer invoices: making the invoice, VAT liability or tax-free, invoicing costs and travel, and how the material reaches your accountant.
24 July 2026 · 5 min
Travel claim: mileage allowance, per diem and how to make one
What a travel claim is and what it includes: mileage allowance, per diem and other travel costs. How a travel claim relates to an entrepreneur's taxation and how to make one in Haimoo.
24 July 2026 · 5 min
Expense claim: how to record a cost and attach the receipt
What an expense claim is, what costs belong to a company and why it pays to attach the receipt right away. How to record a cost and attach the receipt in Haimoo Invoice.
24 July 2026 · 5 min
Payment reminder: when and how to remind about an overdue invoice
When and how to send a payment reminder, what the due date and payment term mean and how late-payment interest is determined. How payment tracking helps you notice overdue invoices.
24 July 2026 · 5 min
Credit note: what it is and how to make one
What a credit note is, when it is made and what it must contain, including a reference to the original invoice. How to make a credit note in Haimoo Invoice.
24 July 2026 · 4 min
Recurring invoice: how to automate regular invoicing
What a recurring invoice is, who continuous invoicing suits and how it saves time. How to set up a recurring invoice in Haimoo Invoice for regular charges.
24 July 2026 · 6 min
Payment tracking: open invoices, receivables and material for your accountant
How to see which invoice is paid and which is open, how to track receivables and how to deliver clear material to your accountant for the value added tax return.