The new OCF on the clean share class will be capped at 50bps compared to the existing clean share class price of 65bps.
The firm is also cutting the upfront charge on its Zero AMC share class from 2% to 1%.
An Architas statement read: "The only additional charge on the Zero AMC share class is some ongoing costs for underlying funds and administration, capped at 0.2% per annum.
"This has the potential to deliver an ongoing saving for longer term investors, who remain invested in the Architas Multi-Asset Passive fund range for more than four years.
"The risk profiled funds take a multi-asset approach, investing in a portfolio of passive strategies to gain exposure to a broad range of asset classes including global and UK equity, fixed income and UK property."

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The Architas Multi-Asset Passive range consists of six passive funds of funds managed by senior investment manager Stephen Allen. The funds are all risk profiled and administered according to the forward looking eValue asset allocation model. From this framework, the Architas investment team constructs the portfolios via a range of passive vehicles, such as trackers and exchange traded funds.

Cedric Bucher, head of business development, said: "Since launch our passive range has proved extremely popular with advisers, and their clients.
"The disciplined approach of the risk model ensures an outcome in line with clients' risk expectations, while the outsourced strategic asset allocation removes emotion.
"The multi-asset, fund of funds approach also gives greater potential for diversification with access to a full range of passive vehicles. Our unfettered approach offers us the opportunity to take advantage of the fierce competition between passive investment managers and the resulting ongoing price cuts, which we pass on to our investors."