About us

Our offices stand for reliability with a professional, state-of-the-art approach to every single issue, even the most complex one. Partnership in business is our underlying principle, and the success of our clients is a priority for us. Our clients appreciate it, which is evidenced by their references.


PhD, CEO, Chartered accountant PhD Renata Gruszka rgruszka@biuro-gwarant.pl+48 609 128 049
Accountant Katarzyna Rzeszowska krzeszowska@biuro-gwarant.pl+48 504 424 731
Accountant Magdalena Chrapek mchrapek@biuro-gwarant.pl+48 504 424 731
Administrative clerk, accounting assistant Angelika Gruszka agruszka@biuro-gwarant.pl
Accountant Monika Szypelt mszypelt@biuro-gwarant.pl+48 504 424 731
Human resources and payroll specialist Marzena Bem kadry@biuro-gwarant.pl+48 690 269 135
Administrative and office worker Magdalena Foltyn mfoltyn@biuro-gwarant.pl+48 798 847 056

Finance and accounting

GWARANT FINANSE I KSIĘGOWOŚĆ Spółka z ograniczoną odpowiedzialnością Spółka komandytowa is a licensed accounting and tax office that renders bookkeeping, tax, HR and payroll services based on certificate No. 17563/00 issued by the Minister of Finance.

Certified Auditor’s Audit

KANCELARIA BIEGŁEGO REWIDENTA GWARANT Spółka z ograniczoną odpowiedzialnością is an entity entered into a list of the National Board of Auditors which groups entities authorised to audit financial statements under entry No. 3885; it provides audit, tax advisory and other relevant audit-related services.

Both companies continue the business activities and traditions of Biuro Rachunkowe i Podatkowe, Kancelaria Biegłego Rewidenta Gwarant Renata Gruszka which started its operations in 2000.

Our Clients

  • Beskidzki Hurt Towarowy w Bielsku-Białej
  • EVIMED w Bielsku-Białej
  • Flex Work Sp. z o.o. w Bielsku-Białej
  • Kancelaria Radcy Prawnego w Bielsku-Białej
  • Kumman w Bielsku-Białej
  • LN Steel Polska Sp. z o.o. w Bielsku-Białej


We make every effort to ensure that the audit of financial statements is not limited to fulfilling a statutory obligation, but brings tangible benefits.

Six reasons in favour
of outsourcing

  • Direct costs reduction and improved control over costs
  • Focus on core activities
  • Access to the best and latest solutions
  • Availability of released resources to be assigned for other purposes
  • No relevant in-house resources
  • Risk split with a service provider

Contact us

If you have questions – write to us and we will help you with any problem.