u/Famous-Remote-3236

It might sounds silly but I am debating to open a CMA with Fidelity. However, I am concerning if I park my cash in core position MMF like SPAXX. If I try to transfer fund between my CMA and Fidelity Brokerage Account, will I loss a day of interest or so? I know MMFs have a T+1 before starting accuring interest

Also, does Fidelity core postion have a T+1 rule before accuring interst for new cash transfering into Fidelity Brokerage Account? Or does it act like a saving account where interest start to accure on the same day when fund is transfer into the account?

I hold multiple credit cards from several banks (such as Chase, Capital One, etc.). Instead of linking these cards to my savings account, I'm considering linking automatic payments (set up auto-pay at the bank/credit card end, rather than through Fidelity's billing process, since Fidelity doesn't know my monthly balance) to my Fidelity Individual Brokerage account. I think this is a reasonable move because Fidelity's core position(SPAXX) typically offer higher returns than High Yield Savings Accounts (HYSAs). However, I'm concerned about whether this will achieve the desired results and whether there are any potential issues with this setup.

Assuming I always ensure I maintain sufficient cash in my Fidelity account, is it possible to link my Fidelity brokerage account to my credit cards, wait for the automatic payments to complete each month, and then leave it at that?

I hold multiple credit cards from several banks (such as Chase, Capital One, etc.). Instead of linking these cards to my savings account, I'm considering linking automatic payments (set up auto-pay at the bank/credit card end, rather than through Fidelity's billing process, since Fidelity doesn't know my monthly balance) to my Fidelity Individual Brokerage account. I think this is a reasonable move because Fidelity's core position(SPAXX) typically offer higher returns than High Yield Savings Accounts (HYSAs). However, I'm concerned about whether this will achieve the desired results and whether there are any potential issues with this setup.

Assuming I always ensure I maintain sufficient cash in my Fidelity account, is it possible to link my Fidelity brokerage account to my credit cards, wait for the automatic payments to complete each month, and then leave it at that?