Most interest rate limits on banks will end Oct. 1

Government regulators dismantled most of the remaining rules on interest rate ceilings for banks and other federally insured financial institutions, effective Oct. 1.

Financial institutions will be able to offer without interest rate restrictions any size savings certificate reaching maturity between 32 days and 21/2 years. An existing $2,500 mininum deposit for newly created ''money market'' checking and Super Now savings deposits was extended to apply to all time deposits that mature in less than 32 days, also beginning Oct. 1.