The Maturity date is used by the tool to determine when automated withdrawals to cover shortfalls in expenses are allowed from the asset. The tool will not allow such withdrawals from the asset prior to the Maturity date.
If an asset is set up with Regular withdrawals prior to the maturity date, the tool will assume that these are allowed.
The tool takes no action in the cashflow projections at Maturity date and assumes that any funds not withdrawn will remain invested in the asset.