Was there a disposal in order to generate the 2024/25 loss? I would be surprised if simply creating the leases was sufficient to create a loss. You mention a limited company but aren't clear on its involvement. Did your wife own the freehold and grant the leases to the company?
Firstly there is our property, which is now split into Freehold ground floor flat for residential purposes for me and my wife. Upstairs there is now 2 leasehold one bedroomed flats let out to tenants. The title deeds for the whole property were split in 2024/25, I got values for each flat which created a loss on the two letting flats due to all the conversion work. The whole property will hopefully be sold in 2025/26 but if they sell for below the agent's valuation there will be a further loss and selling costs. So would I now put in the 2024/25 agent's valuation as cost and set them against the selling price?
Now, so as not to get mixed up, my wife is a shareholder in a family property limited company. She is due an interim payment soon of about £100,000 and the balance will be paid in 6 months time, after HMRC have agreed the corporation tax. So presumably this loss will be set against the £100,000 sale proceeds and submitted to HMRC within 60 days, the proceeds will not utilise the cost of shares and loss brought forward and so there will be a loss still carried forward. Then another CGT return would need to be done in 6 months time and set against the further proceeds and loss set against it to create the capital gain so as we can work out tax payable. There is then still a chance there may be a loss to carry forward.
Hope things are now clearer for you to understand.