The grey economy
Updating and storing accounts and certificates
For the information to reflect the contract partner's current situation as well as possible, the accounts and certificates may not be older than three months when the contract is concluded. All paperwork must be kept by the contractor for at least two years after the work concerned has been completed.
In the case of extended agreements with an agreement period of more than one year, the partner must submit to the contractor a report on tax payments and pension insurance every 12 months.
If the contractor signs a new agreement with the same partner before 12 months have elapsed from the signing of the previous agreement and the obtaining of the related reports, the contractor is generally exempt from obtaining new reports. However, if there is reason to believe that there has been a material change in the partner’s circumstances warranting a new investigation, then the contractor must obtain new reports on the partner before signing the new agreement.