Field help: Should a gross salary that differs from the employment tax statement be declared due to a correction of the company car tax? You have used a company car and would like to Claim the logbook method instead of the previous flat-rate allowance from the employer or Claim other corrections when determining the non-cash benefit from the use of the company car or Correct a usage fee paid (e.g. additional payments for the operating costs of the company car)? If you select "yes" here, then enter the correspondingly reduced gross salary in line “3. Gross salary” on the following "Employment tax data" page. Use our step-by-step guide to gross wage adjustment in the tax return.