Originally posted by mpp
Aaargh, I am confused about your statement (it seems contradictory), so correct me if I'm wrong.
I was under the impression that paid revolving credit lines with no balance really do nothing for your FICO...with a small balance they can help. Long term installment loans are the key to a good FICO. So why have the extra zero balance credit cards out there? Closing them shouldn't change the FICO. Not having the cards will prevent possible impulse spending and over-extending yourself. Without the cards there also can't be a mistake in not recording a payment or a false late-payment. I'm no expert in this area so perhaps I'm wrong; let me know what you think.
The highest FICO boost you will get will be to put a $1 balance on the card. You can, of course, charge that $1 on the card five years from now. At which point within 30 days it will report and your score will be boosted with an aged revolving line. There doesn't seem to be a need to carry the balance.
A zero balance will still increase your overall available credit. It will also increase the average age of your open revolving accounts. Both of these will improve FICO's. It can be especially important if you carry any balances. Charging up one month, paying it all off, and charging up the next month is the same as carrying a balance for these purposes.
As to whether you can have too many open accounts assuming you have zero in balances (or <1% available credit being used), that is a matter of debate and will also vary according to the score being used (ie, a Beacon which seems to have an insatiable appetite for open accounts even with zero balances vs some of the bank's prop scores which may not).
As to plastic and self-restraint, that is not a FICO or Aaargh! question.
Finally, as to late pays, there are outstanding and cheap bill paying services out there which you should use if you think there is any whiff of a possibility of sending in a late payment. Most folks think a 30 day late is no big deal. And it isn't. Except to FICO -- that single late payment immediately turns your revolving line in a negative, a hurt for 7 years rather than a help. Pay the electricity late, not first usa.