Our RTM company is taking over management of the building from First Port on 15 September 2026.
The half-yearly service charge period runs from 1 May 2026 to 31 October 2026. However, First Port will not be managing the building for that whole period.
Because First Port’s management ends on 14 September 2026, we only need to transfer a pro-rata amount to First Port for the part of the period when they are still responsible for management.
This means the amount payable to First Port should only cover the period from 1 May 2026 to 14 September 2026.
From 15 September 2026 onwards, the RTM company will be responsible for management, so the remaining amount for the period from 15 September 2026 to 31 October 2026 should not be sent to First Port.
The half-yearly service charge period from 1 May 2026 to 31 October 2026 is 184 days.
First Port is only responsible for the period from 1 May 2026 to 14 September 2026, which is 137 days.
Therefore, the pro-rata amount payable to First Port is calculated as:
First Port payment = Service charge × 137 ÷ 184
This means First Port should receive only the proportion of the service charge relating to the 137 days they are managing the building, rather than the full 184-day period.
Enter your service charge amount below. You can use either the half-yearly or the yearly figure. The calculator will show the pro-rata amount payable to First Port for 137 days.