While the impact of the downgrade on bond markets aren’t clear yet, investors may not yet have to worry about major near-term impacts to U.S. equities or Treasury yields, money managers told Barron’s.

The US has been stripped of its top-notch triple-a credit rating by Moody’s on concerns about rising levels of government debt.

The US has lost its last perfect credit rating, as influential ratings firm Moody's expressed concern over the government's ability to pay back its debt. In lowering the US rating from 'AAA' to 'Aa1', Moody's noted that successive US administrations had failed to reverse ballooning deficits and interest costs.