Guide

#Part-time light entrepreneurship is a flexible way to boost your income

Many light entrepreneurs take on gigs alongside their day job: weekend renovations, photography, translations, coding, or consulting. Doing this part-time is a great way to test whether there's demand for your skills, without quitting your job or setting up a company. If you don't have any gigs in a given month, you don't have any fixed costs running either.

As a light entrepreneur, you send invoices through the Truster app and get paid for your work, with taxes and reporting already taken care of. What's left for you to handle is the work itself, your pricing, and the three topics covered in this guide: your tax card, your relationship with your employer, and your own wellbeing.

Working part-time is also a financially sensible way to test a business idea. Setting up a company for side income would bring bookkeeping, reporting and administrative work that eats into the appeal of small earnings. As a light entrepreneur, you only pay for invoicing, so even occasional gigs are worthwhile. And if your enthusiasm wanes for a while, you don't need to close your account: it will simply wait for your next gig.

Part-time light entrepreneurship also doesn't require major upfront investment: most people start with the skills and equipment they already have. After your first few gigs, you'll already know a lot: what kind of work clients are willing to pay for, how much time gigs take, and whether doing this after your day job feels energizing or draining. That knowledge is valuable if you ever consider becoming a full-time entrepreneur.

#Your tax card and extra income

For tax purposes, all your salary income is added together: both the salary from your employment and the pay Truster issues you count as earned income. Truster withholds tax according to your tax card, so you don't need to remit taxes yourself. You also don't need a separate tax card for gig income.

There is one thing worth handling right away, though: as your income grows from gigs, check that your tax card's income ceiling and withholding rate match your actual total income. You can update this in OmaVero (the Finnish Tax Administration's online service) in just a few minutes. This helps you avoid a situation where too little tax is withheld during the year, leaving you with a back tax bill afterwards.

Practical tip: estimate your gig income for the year in advance and add that estimate to your tax card's income ceiling early in the year. With the Truster app's pay calculator, you can see before taking a gig how much of the invoiced amount you'll actually take home, so you can price your work correctly. After the tax year ends, you'll review your pre-completed tax return as usual, since your pay data is automatically reported to the tax authorities each time you're paid.

Many part-time gig workers needlessly worry that extra income will complicate their taxes. In reality, the system is built exactly for this: your tax card combines all salary income, and your final tax is settled through your tax return. The only thing that can catch you off guard is an income ceiling you forgot to update, and even that's fixed in a few minutes in OmaVero.

#Non-compete and duty of loyalty as concepts

An employee is bound by a duty of loyalty: you must avoid actions that conflict with your employer's interests. This includes a ban on competing activity with your employer that would clearly cause them harm. Your employment contract may also include separate terms, such as a non-compete clause or an obligation to disclose side jobs.

In practice: read your employment contract before you start, and honestly assess whether the gig work you're planning competes with your employer's business. Working in a different field is rarely a problem, but serving the same clients with the same expertise can be. When in doubt, an open conversation with your employer is your best safeguard, and you can also get advice from your trade union if needed.

Note also that in some fields, and especially in public-sector positions, side jobs may involve a notification or permit requirement: you may need to inform your employer of a side job or apply for permission. Practices vary by workplace, so check your own employer's rules before starting. Handling this openly from the outset means gig work won't create tension in your employment relationship later on.

A non-compete clause is different from the statutory ban on competing activity: a clause can restrict your work even after your employment ends, and its enforceability has its own rules. If your employment contract contains such a clause and you're planning gig work close to your own field, find out what the clause means before starting — for example, through your trade union's legal advice service.

#Your energy levels matter in the long run

Combining two jobs is exciting, but it draws on the same energy reserves as everything else in life. It's worth starting part-time gig work gradually: take on one or two gigs first and see how it feels in your daily life before committing to bigger workloads.

The strength of light entrepreneurship lies exactly in the fact that you set the pace. You can take a break from gigs during busy periods and take on more when your calendar has room. Price your work so it also covers preparation and travel time, so every gig feels worthwhile rather than an obligation.

A good practical approach is to set aside a fixed slot in your calendar for gigs, for example one weekday evening and a Saturday morning, and keep the rest of your time free. That way gig work doesn't spread into every evening or eat into your recovery time. Let your loved ones know when you're doing gigs, so your side work doesn't catch your family off guard. And if you notice you're getting tired, slow down: with light entrepreneurship there's no notice period and no boss you need permission from to take a break.

#How to start part-time light entrepreneurship

Getting started is straightforward: check your employment contract, open a free Truster account, add your tax card, and send your first invoice once the gig is done. Truster costs 3.99% of invoicing or €55/month, and you only pay when you're actually invoicing.

If your side work grows into a full-time pursuit over time, you can continue as a light entrepreneur or move to Truster's sole proprietorship service. You don't need to decide your future right now: start with one gig and let things grow at your own pace.

If you want your pay available to you right away instead of waiting for the client to pay the invoice, you can use HetiPalkka, priced at 5% per invoice. That way your side income adapts to your own life situation, not your clients' payment schedules.

Many people start cautiously with one client and find, six months later, that gigs have become a meaningful boost to their finances. Others deliberately keep their gig work small and simply enjoy the fact that their skills bring in a bit of extra money now and then. Both approaches are equally valid: part-time light entrepreneurship is a tool, and you decide how to use it.