ExLandlord has the following advice for season ticket holders with the aim of helping Hereford United:
I've noticed a few comments on Bulls Banet, Twatter and Bookface from people planning to pay for their FA Cup match ticket rather than using the voucher entirlement in the ST book.
Please Don't Do It!.
The FA Cup ticketing rules state that a percentage of your Season Ticket FA Cup entitlement will go to STFC in any case so there's no benefit in giving them a further contribution by buying a ticket.
Use your voucher and, if you want to help the Club financially then make a separate donation which a) will not include VAT and b) will not inflate the STFC share of the gate money.
Also, if any ST holders are not able to attend you should make sure that the voucher is used by a non-ST holder and that they make the donation instead.