Side Hustles: Working Geringfügig on Top of a Full-Time Job
Living in an expensive hub like Vienna or Salzburg often means your primary salary doesn't stretch quite as far as you'd like, especially when you factor in the rising costs of energy and rent. I remember my first year in Austria, staring at a beautiful but pricey Altbau apartment and realizing that my standard office job wouldn't leave much room for weekend trips to the Alps. The solution seemed simple: get a small side job. However, I quickly realized that in Austria, "simple" is a word rarely used in the same sentence as "employment law." This guide will help you navigate the labyrinth of marginal employment, commonly known as Geringfügig work, so you can earn extra cash without getting crushed by the tax office later.
Understanding the Geringfügigkeitsgrenze
The term "Geringfügige Beschäftigung" refers to marginal employment where you earn below a specific monthly threshold set by the government. For 2026, this limit is approximately 530 EUR per month (the exact figure is adjusted annually for inflation). This threshold is the "magic number" because, on its own, it carries very few social insurance deductions for the employee. If this were your only job, you would only be insured for accidents, not for health or pension.
However, once you add this side hustle to a full-time position, the math changes drastically. The Austrian system views your income as a cumulative total. If you earn 3,500 EUR at your main job and 500 EUR at your side hustle, the state sees 4,000 EUR of taxable income. Many expats fall into the trap of thinking the side hustle is "tax-free" because the employer doesn't deduct social security on the spot. This is a dangerous misconception. In reality, you aren't paying that insurance monthly, but the ÖGK (Österreichische Gesundheitskasse) is keeping a very detailed tab.
To really get a grip on how this looks on paper, you should review your Lohnzettel Breakdown: Gross vs Net Salary Explained for your main job first. This helps you understand where you currently sit in the tax brackets. Remember, the marginal limit applies to the gross amount. If your side gig pays you 540 EUR, you have officially crossed the line, and the job is no longer "marginal," triggering immediate deductions.
The Social Insurance Trap and the Dreaded Back-Payment
The biggest headache for expats working a side hustle is the "Nachzahlung"—the back-payment. When you work a Geringfügig job on top of a full-time job, your side employer only pays accident insurance. They do not deduct health or pension insurance from your small paycheck because, technically, the job is marginal. But because you are already fully insured through your main employer, these two incomes are merged at the end of the year.
The social insurance authorities will eventually realize you had two incomes that, when combined, exceed the monthly insurance threshold. About a year later, you will receive a letter from the ÖGK or SVS asking for roughly 14% to 15% of everything you earned at that side job. If you haven't set that money aside, it can be a painful financial shock. This is where Navigating Social Insurance: ÖGK, SVS, and BVAEB Overview becomes essential reading, as it explains how these agencies communicate with each other.
To avoid this, we recommend "self-taxing." Every time you get your 500 EUR from your side gig, immediately move 15% of it into a separate savings account. Think of it as a ghost deduction. When the letter from the health insurance office arrives twelve months later, you can pay it off with a smile rather than a panic attack. For more details on these costs, check Social Insurance Deductions: Where Does Your Gross Pay Go?.
| Feature | Full-Time Job (Main) | Geringfügig Side Hustle | Combined Effect |
|---|---|---|---|
| Social Insurance | Deducted automatically | Only accident insurance paid by boss | You owe ~15% back-payment later |
| Income Tax | Deducted automatically | No tax deducted at source | Side income taxed at your highest bracket |
| 13th/14th Salary | Yes (Urlaubsgeld/Weihnachtsgeld) | Usually yes (pro-rata) | Adds to your total annual tax burden |
| Working Hours | Typically 38.5 – 40 hours | Usually 5 – 10 hours | Must not exceed legal rest limits |
Legal and Contractual Obligations with Your Main Employer
Before you sign a contract for a weekend gig or a few hours of freelance consulting, you must look at your primary employment contract. Almost every Austrian contract includes a clause regarding "Nebenbeschäftigung" (secondary employment). Usually, it states that you must inform your employer or seek their explicit consent before taking another job.
Why do they care? Two reasons: competition and exhaustion. Under the "Konkurrenzverbot" (non-compete clause), you are legally barred from working for a competitor or starting a business that competes in the same field as your main employer. If you are a developer at a bank, you likely cannot moon-light as a developer for a fintech startup. Furthermore, Austrian law is very strict about rest periods. You are generally not allowed to work more than 12 hours a day or 60 hours a week, and you must have 11 hours of uninterrupted rest between shifts.
There are cases where people get fired "mit Grund" (with cause) because they started a side hustle that the boss found out about via LinkedIn. Even if your boss is cool, get the permission in writing. It protects your Employment Rights: Arbeiterkammer, Contracts, and Leave and ensures that if your performance dips, they can't point to your side job as the legal reason to terminate you. If you're unsure about the wording in your contract, a quick visit to the Arbeiterkammer can provide you with a free legal review.
Tax Brackets and the Annual Tax Return
This is the part where the "friendly" side hustle starts to feel like a math exam. In Austria, we have a progressive tax system. Your main salary likely already puts you in the 30% or 40% tax bracket. When you add a side hustle, every single Euro of that side income is taxed at your highest marginal rate.
For example, if your main job's last Euro is taxed at 42%, your entire Geringfügig income will also be taxed at 42% when you do your end-of-year declaration. You won't see this deduction in your monthly side-paycheck, which feels great at the time, but the Finanzamt will catch up with you during the "Arbeitnehmerveranlagung" (employee tax assessment).
You must familiarize yourself with the Income Tax Brackets 2026: Navigating the 0% to 55% Rates to estimate how much of your extra earnings you'll actually get to keep. Often, after social insurance back-payments and income tax, that 500 EUR side gig might only net you about 250 EUR. For some, the extra 250 EUR is worth the 10 hours of work; for others, it's a realization that they'd rather have their Saturdays back.
To manage this, you'll need to use Taxes in Austria: Finanzamt, Returns, and Brackets 2026 as a guide for your annual filing. Using the FinanzOnline portal is mandatory for this, and it’s actually quite efficient once you get the hang of it. If your side hustle involves freelancing rather than a standard employment contract, you might even consider Setting up as a Freelancer (Freier Dienstnehmer vs Gewerbe) or reading the Freelancing in Austria: The Neue Selbständige Legal Guide to see if a different legal structure benefits you more.
Managing the 13th and 14th Salary Impact
One of the best parts of working in Austria is the double salary in June and November. If you want to dive deeper into why this exists, read Austrian Work Culture: 14 Salaries, Meetings, and Etiquette. However, these bonuses also apply to Geringfügig jobs. Most marginal employment contracts will pay you a pro-rata share of a 13th and 14th salary.
While this feels like a nice bonus, it increases your total annual income, which can push you into a higher tax bracket or increase the amount of social insurance you owe back. It’s a bit of a "success tax." The more you earn from your side hustle, the more the state will take in percentage terms. When calculating if a side hustle is worth your time, always calculate your "Total Annual Net" rather than just looking at the monthly cash in hand. If you find the bureaucracy overwhelming, you aren't alone—every expat I know has a story about their first "Finanzamt surprise." The key is preparation and never assuming that "net" means "final" until the tax year is closed.
Important Legal Disclaimer
The information provided in this guide is for educational and informational purposes only and does not constitute legal, financial, or tax advice. Austrian employment and tax laws are subject to frequent changes and can vary based on individual circumstances, such as residency status, total income, and specific contract clauses. While we strive to provide accurate and up-to-date information, you should always consult with a qualified tax advisor (Steuerberater), the Arbeiterkammer, or the relevant social insurance authority (ÖGK/SVS) before making decisions regarding secondary employment or tax filings. The author and publisher are not liable for any financial losses or legal issues arising from the use of this information.
