Administration in order at the end of the year: checklist for self-employed people – The Happy Financial

The end of the year is approaching. That means: time to complete your administration properly. With this article I will help you step by step to get your accounting in order as a self-employed person. This way you can enter 2026 fresh and prepared. In this checklist you will find everything: from invoices to investments, from outstanding costs to private corrections.

Why this checklist is important

As a self-employed person, you are not obliged to prepare formal annual accounts. Yet a year-end closing is smart. You map out all income, expenses, investments and obligations. And you avoid getting into trouble later when filing your tax return or at the beginning of the next year.

What to check: the key points

Below you will find the most important items you need to check or enter before closing the year:

• All invoices (incoming and outgoing) processed and uploaded.
• Bank transactions checked: balances match, transactions posted.
• Outstanding invoices (debtors) and costs (creditors) mapped out, reminders sent or booked.
• Investment expenses collected, for example business assets, for deductions.
• Depreciation recorded, if you previously made investments.
• Private use settled: telephone, internet or travel costs for private use.
• Time administration updated, to make it hour criterion to be able to substantiate.
• Created an overview of all tax return documents: invoices, payment slips, investments, etc.

Avoid common mistakes

Many self-employed people leave one or more of the following items behind at the end of the year:

• Receipts or invoices are missing — you are missing deductions or paying too much tax.
• Bank transactions not audited — discrepancy between bank and accounting remains.
• Unpaid invoices not followed up — causing you to lose income.
• Time administration incomplete — deductions (such as self-employed persons’ deduction) are missed.
• Forget investment costs or depreciation — use fewer tax benefits.
• Private use not processed correctly — leads to incorrect bookings or corrections.

Step-by-step plan for the end of the year: this is how you approach it

1. Collect all invoices — sales and purchasing — and process them in your administration. Check whether they have been paid or are still outstanding.
2. Check your bank transactions: compare your bank statements with your accounting and correct errors or missing entries.
3. Map outstanding debtors and creditors. Send customers a reminder if necessary. Book costs or set up facilities.
4. Process all business expenses (including receipts) and apply personal corrections as necessary.
5. See if you’ve made any investments — enter them, assess depreciation and check for deductions.
6. Update your time administration — record direct and indirect hours, and check the hour criterion.
7. Make an overview of all documents for the declaration: invoices, payment slips, investments, balance statements, etc.
8. Make a backup of your administration (cloud or external drive) so that your supporting documents are preserved.

Checklist for your year-end closing

• Sales invoices processed + paid / declared outstanding
• Purchase invoices + receipts processed
• Bank transactions checked
• Debtors and creditors updated
• Business costs including private corrections processed
• Investments entered, depreciation checked
• Time administration up to date
• Complete overview of tax return documents
• Backup of administration made

When should you do this check?

You can do the year-end closing as soon as you are sure that all invoices (purchases and sales) for the year have been processed. Don’t wait until January: the end of December, or immediately after receiving the last invoices, is ideal. This way you prevent corrections afterwards.

What does it get you?

With neat administration at the end of the year you gain overview, peace and control. You know exactly what your income and costs were, what investments you made and what your outstanding items are. This makes your tax return simpler and helps you plan for 2026. Moreover, you make optimal use of tax deductions.

See this checklist as your financial starting point for the new year. With a tidy administration you work more efficiently and avoid surprises.

Would you like help setting up your administration or making a good layout? Then download our Starter Bundle: a practical format with which you can create an overview this year. Download the bundle.