Use formatting switches in the Word field for the simplest approach -
http://www.gmayor.com/formatting_word_fields.htm
If you want the more complicated approach see the Excel data section of
http://www.gmayor.com/mail_merge_labels_with_word_xp.htm (the issues and
workarounds are the same for Access).

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Graham Mayor - Word MVP
My web site www.gmayor.com
Word MVP web site http://word.mvps.org
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> How can I retain the Access format in a word merge document?
>
> i.e data format in Access is 'Currency' when merged to Word the
> currency format is lost. same applys to 'Date' formats.