External CFO

The concentrated know-how of a financial expert - but not paid full-time, but on a mandate basis.

The expertise of a CFO on call

Would you like an external CFO / head of finance for your company who can advise you on your financial issues or provide operational support? That's great. But: As an SME or start-up, you want the know-how of financial experts, but usually don't need them full-time. The solution: an external CFO on a mandate basis.

From entrepreneur to entrepreneur

As the founder and owner of a trust company as well as a partner and external CFO of other companies, I am convinced that I can support you not only with my professional expertise but also with my wealth of practical experience.

We can advise you in these areas

Accounting

Pay and post your supplier invoices, reconcile customer invoices, expenses, credit card. Incl. year-end closing and VAT.

Payroll

We can support you with everything from leaving the company to monthly payslips, accident reports and annual declarations

Taxes

We take care of your company's tax return, as well as the regular VAT declarations and, if you wish, your private taxes too

Financial management

Financial plans

Sparring partner for important decisions

Budget processes

Cash flow planning

Review of internal accounting

Financial contact person for the Board of Directors, investors and banks

Financial management

Financial plans

Sparring partner for important decisions

Budget processes

Cash flow planning

Review of internal accounting

Financial contact person for the Board of Directors, investors and banks

Your advantages

  1. Cost savings
    1. You do not have to hire an internal financial expert, but can bring concentrated knowledge into your company on a mandate basis.
  2. Expertise and experience
    1. We are always up to date. Your external CFO brings up-to-date knowledge directly into your accounting and planning.
  3. Flexibility
    1. Perhaps you would like ad interim support until a suitable specialist is available? Our CFO Service offers exactly this option.
  4. Independence and objectivity
    1. We are independent of internal opinions and, as an external CFO, bring a beneficial view from the outside.

Interested?
Contact us!

Let us take care of the administrative side of your business so you can focus on what you do best - your craft! Contact us to learn more.

Do you have any questions?
+41 44 518 86 00

We look forward to receiving your email
info@adminster.ch

adminster ag
Forchstrasse 60
8008 Zurich

adminster fiduciary gmbh
Baarerstrasse 94
6300 Zug

what customers say about us

"With humor and joy!"

I founded my company with adminster.
I am very satisfied!
Will now continue to work with them.

M
Michael Dettwiler

adminster then gave us a helping hand with their expertise and ensured that we no longer just had the right turnover, but that our accounting was also in line with legal requirements.

If you are looking for a partner in the area of finance and accounting who can ensure that everything in this area is as it should be in an uncomplicated and independent manner, then adminster is an ideal partner.

H
Hans Geeler

Very professional and reliable service. The adminster team works quickly and precisely and offers expert advice. We have been working with them since the beginning and have been able to see how a start-up has become a really great SME. I am very satisfied with the collaboration and can recommend the service without reservation!

M
Marco Licini

We have been working with adminster since this year and are surprised by the good quality. By quality we mean digital processes, direct communication and excellent advice at a fair price. Absolutely top!

P
Physio Schenk

Professional support in all areas with extremely friendly people. I can recommend adminster fiduciary who wants straightforward, competent, and reliable support.

M
Madleina Speich

I have been working with adminster for years and am completely satisfied. Whether accounting, payroll administration, taxes or business consulting - I always receive competent, fast and reliable support. The collaboration is personal, professional and solution-oriented. For me, they are the first port of call for all financial and administrative matters. Highly recommended!

S
Sat To

We have been working with adminster for over 1.5 years now. They do most of the bookkeeping for us. The cooperation with Simon and his team is very competent, reliable and on an equal footing. We are very satisfied!

J
Jesse Gerner

I've been working with Simon and his team for almost 3 years now. It has been a pleasant experience all the way. As a lean start-up, we try to do the maximum by our own (As it is the cheapest). Simon supported us in this effort and never gave me the feeling of being a complete newbie (despite making many and repetitive mistakes). I recommended Simon already to multiple other start-ups and companies and had great feedback from them as well.

C
Charly Stahl
Tired of bookkeeping?
We have an idea!
Straightforward fiduciary and tax-
e solutions for SMEs
Payroll
Accounting for startups
Accounting for craftsmen
bexio trustee
Between Christmas and New Year, from 24.12-4.1.2026 we take a break and can only be reached in emergencies at info@adminster.ch.
Do you have any questions?
We look forward to receiving your email