From the FA website
Suspensions are automatically imposed for accumulating 5, 10, or 15 cautions in a season. There are cut-off dates for receiving a sanction as a result of accumulated cautions. They are:
CAUTIONS CUT OFF DATES (Inclusive)
5 (Premier League) 31 December
5 (Football League, National League, Steps 2-4) 30 November
10 (Premier League, Steps 2-4) 2nd Sunday in April
10 (Football League, National League) 2nd Sunday in March
15 End of Season
For example, a Premier League player earning their fifth caution of the season on or after 1st January would not earn any ban. However, if they received ten cautions by the second Sunday in April, a ban would apply. Players who receive 20 or more cautions in a season shall be required to attend a Regulatory Commission.
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