Field help:
30.The calendar year in which you first received a pension payment
Enter the calendar year from line 30 of your employment tax statement in the format YYYY:
"Relevant calendar year for the start of pension payments for 8. and/or 9.)"

If the year of first receipt is before 2005, the year 2005 is always used as the relevant year for calculating the pension allowance and the supplement to the pension allowance.