Social Insurance Administration: Holiday and December supplements
How are the holiday and December supplements calculated if I am entitled to both medical and rehabilitation allowance and a disability pension during the year?
The holiday and December supplements are then calculated in proportion to the number of months you are entitled to payment from the respective allowance category. If you receive medical and rehabilitation allowance for 4 months and a disability pension for 8 months, then the entitlement to the holiday and December supplements is 33% for the medical and rehabilitation allowance and 66% for the disability pension.