Tax Return for Sole Proprietors
The modern tax return for sole proprietors.
As a self-employed professional in Switzerland, filing your tax return shouldn't be a source of stress. FIN supports sole proprietors with simple, precise and fully digital tax filing — so you can focus on what matters most.
Our fixed-price packages give you full transparency from the start, with expert guidance every step of the way.
Clarity, not complexity.
Our principle is simple: everyone deserves financial clarity and real guidance — especially when you run your own business.
The Power Duo: FIN x einzly
One click, all set.
We've partnered with einzly to make tax filing even easier for sole proprietors in Switzerland. Simply connect your account, and all relevant accounting data flows directly to FIN — no manual data entry, no room for error.
Automatic data transfer
Revenue, expenses, allowances and social-security contributions flow directly from einzly into the FIN portal.
AI-powered efficiency
Use einzly's AI chatbot for invoice creation and automated receipt recognition — less admin, more business.
A simpler way to file
No more confusion — just one clear, efficient workflow from first login to final tax assessment.
Built for self-employed
professionals.
At FIN, we offer modular, transparent services that evolve with your business — from your first client invoice to scaling your Einzelfirma. One dedicated tax advisor, clarity in every step.
Whether you're a freelancer, consultant, tradesperson or creative, we make Swiss tax compliance effortless.
Tax Return Filing
learn more
Complete Swiss tax return for sole proprietors — every deduction optimized.
We prepare and file your full Swiss tax return, including the supplementary form for self-employed individuals (Hilfsblatt Selbstständige). Every deduction gets reviewed, from home office to business travel to social security.
einzly API Integration
learn more
Connect your einzly account and skip the paperwork entirely.
Once our webhook recognizes your API, your einzly account links with the FIN portal in a single click. Revenue, expenses, allowances and AHV data flow directly to us — no exports, no emails, no typos.
VAT Processing
learn more
Quarterly or semi-annual VAT filings handled end-to-end.
FIN offers VAT processing as a dedicated add-on or as part of our Premium and All-Inclusive packages. With einzly connected, the relevant revenue and expense data is already structured for accurate VAT returns.
Full Tax Representation
learn more
We deal with the tax office — you focus on your business.
With power of attorney (Vollmacht) you delegate every exchange with the cantonal tax authority to us. We handle follow-up questions, deadline extensions, objections and final assessments.
Trust the Stars: Google Reviews
Own your finances, just three steps away
Free Initial Consultation
Step one
Tell us about your Einzelfirma. In a free, no-obligation call we understand your situation and recommend the right package. From day one, you know exactly what you pay and what you get — with our SPOC, a single dedicated advisor for every stage of your financial life.
How it works →Connect einzly & Upload Documents
Step two
One click connects your einzly account to the FIN portal — revenue, expenses and AHV data sync automatically. Remaining documents go into your personalised checklist, securely stored in the Swiss Cloud with two-factor authentication.
How it works →Full Review & Optimisation
Step three
We don't just fill out forms. We actively look for optimisation opportunities for this tax year and the next — from Pillar 3a and pension fund buy-ins to business deductions you may not even know exist.
How it works →You always know what to expect
Our flat-rate model adjusts to your situation and is made up of transparent components.
Basic Package
Make the most of all available tax deductions.
- Tax return filing
- Deadline extension
- Add-ons based on complexity
Basic Package
- Tax return filing We prepare and file your complete Swiss tax return, optimizing every deduction.
- Deadline extension We handle the formal deadline extension request with your canton.
- Add-ons based on complexity Additional services only when your situation requires them — no hidden costs.
Most appreciated
Premium Package
We fully represent you with the tax authorities & take care of all the tax hassle for you.
- Everything from Basic
- Personal consultation
- Full representation
- Document requests from tax authorities
- Tax objection
Premium Package
- Everything from Basic All Basic services included as your solid foundation.
- Personal consultation One-on-one session to review your financial situation and tax strategy.
- Full representation We communicate directly with tax authorities on your behalf.
- Document requests from tax authorities We handle all information requests and correspondence.
- Tax objection We file formal objections if your tax assessment needs correction.
All Inclusive
Sit back and relax. Your ultimate peace-of-mind package.
- Everything from Premium
- Priority processing
- Ongoing optimizations
- No extra charges
All Inclusive
- Everything from Premium Complete Premium coverage with additional exclusive benefits.
- Priority processing Your case gets fast-tracked through our workflow.
- Ongoing optimizations Proactive multi-year tax planning tailored to your goals.
- No extra charges Flat rate covers everything — no surprises, no add-ons needed.
Additional Services
(e.g. bank accounts; debts) CHF 10 per item
(foreign withholding tax) CHF 200
(within 5 days) CHF 200
Still got questions?
We're here with the answers you need.
Here's what sole proprietors often want to know before getting started with FIN.
How does the integration with einzly.ch work?
It's simple: once our webhook identifies your API, your einzly account is automatically connected to the FIN portal. With a single click, your revenue, expenses, allowances and social-security data are transferred directly to us — no manual data entry, no room for error.
Is the initial consultation really free of charge?
Yes. In our first, no-obligation consultation we take the time to understand your unique situation as a sole proprietor — completely free of charge.
How secure is my data in the FIN portal?
Your documents are stored securely in the Swiss Cloud and access is protected by two-factor authentication. Both FIN and einzly operate under Swiss data protection standards.
What is a SPOC?
SPOC stands for "Single Point of Contact". You have one dedicated tax advisor at FIN who guides you through every stage of your business and financial life — from your first return to long-term optimisation.
Will you handle the deadline extension for me?
Yes, a deadline extension is already included in the Basic Package so you never face time pressure during tax season.
What happens if the tax authorities have follow-up questions?
You can add simple tax representation as a modular service. In the Premium and All-Inclusive packages we provide full representation with the authorities and handle every follow-up question for you.
How do I declare my income from my sole proprietorship?
We guide you through the supplementary form for self-employed individuals (Hilfsblatt Selbstständige) so that your business income is recorded correctly and transparently. With einzly connected, most of the data is already structured for us.
Will you find all possible deductions for me?
We don't just fill out forms — we actively look for optimisation opportunities for this year and the next, from home office and travel to professional development and health costs.
Do you consider Pillar 3a and pension fund buy-ins?
Definitely. These are central components of our long-term wealth and pension planning strategy for self-employed clients, and often represent the single largest tax saving opportunity for sole proprietors.
Is foreign income also taken into account?
Yes. We have deep expertise in declaring foreign assets and cross-border tax matters — specifically for expat founders and international freelancers operating from Switzerland.
Do I have to register for social security as a sole proprietor?
Yes. Self-employment in Switzerland requires AHV/IV/EO registration with your compensation office. We flag the requirement during onboarding and coordinate with your einzly data to ensure contributions are declared correctly.
Can FIN handle my VAT filings?
Yes. We offer VAT processing as a dedicated add-on or as part of our more comprehensive service packages (Premium, All-Inclusive).
When do I need to register for VAT as a sole proprietor?
VAT registration is mandatory once your annual turnover from taxable activities exceeds CHF 100,000. Below that threshold, registration is voluntary — we can run the numbers and advise whether opting in makes financial sense for your business.
How does einzly help with VAT?
Through the API connection, all relevant revenue and expenses are exported directly from einzly — forming a clean, structured basis for accurate quarterly or semi-annual VAT filings.
Effective rate, flat-rate or net-tax rate — which VAT method is right for me?
Small businesses can often choose between the standard method, the flat-rate (Saldosteuersatz) or the net-tax method. The right choice depends on your industry margins and deductible input tax. We review your einzly data and recommend the most tax-efficient option.
Which package is right for me as a sole proprietor?
The Basic package covers a straightforward tax return with all deductions. Premium adds einzly integration, a personal consultation and full representation — the sweet spot for most Einzelfirmen. All-Inclusive adds priority processing, mid-year planning and a multi-year optimisation strategy with no surprise add-ons.
Are there hidden fees?
No. Every price on this page is a starting flat rate. Add-ons are listed transparently in the "Additional Services" section and only apply if your situation actually requires them.
Can I switch packages later?
Yes. Many clients start with Basic and upgrade to Premium or All-Inclusive once their business grows or tax representation becomes valuable. We always charge the difference, never the full package twice.
Does FIN work with clients across all cantons?
Yes. We file for clients in every Swiss canton. A small surcharge applies for non-Zurich cantons, listed in the add-ons — this covers the cantonal software and procedural differences.