You can either create one yourself with Excel's financial functions; see
http://office.microsoft.com/en-us/excel/HA011117451033.aspx
or use one of many templates, like these:
http://office.microsoft.com/en-us/templates/results.aspx?qu=amortization&av=TPL000

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Kind regards,
Niek Otten
Microsoft MVP - Excel
| how do i create amortization tables in Excel 2003