Field help:
Last month for which pension payments were made.
Enter the last month from line 31 of your employment tax statement in the format MM (e.g. "12" for the last month):
"To 8. for payments made during the year: First and last month for which pension payments were made"

No entry for full-year receipt: If you received the pension payments for the entire year 2025, no period specification is required.
Impact on the pension allowance: The pension allowance is reduced by one twelfth for each month without pension payments. Such a reduction is usually only relevant in the year of first receipt or in the event of death.