You may submit your MCS-150 electronically or by mail.
A carrier files an MCS-150 when obtaining the US DOT number.
Using averages can impact a carriers percentiles in the safety measurement system scoring process.
View the SMS Methodology for addition details on percentile calculations.
The FMCSA is now saying that for the January 2013 CSA calculations, if a carriers MCS-150 has not been updated since 2010, the data provided will not be used.
Instead, the calculation will use a default of averages over the previous 18 months.