If I do not pledge towards a project via my CrowdProperty IFISA during the tax year, does it affect my ISA allowance?

If you make a deposit in to your IFISA account, the amount subscribed will use part of your ISA allowance, even if you do not use this subscription to make an investment in a specific project. If you do not use up your ISA allowance for the tax year, it will not be carried over to the next year.