The business approach is to work out what it would cost you to maintain, factor in emergencies based on past experience and add 25% for profit. Its not an exact science but you need to justify why you need to be paid 10 or 17 percent.

On Fri, Sep 17, 2010 at 12:51 PM, Alvin Jason Ochieng <ajochola@gmail.com> wrote:
There is no set standard. I suggest nothing less than 20% margin.For
Updates etc based on the kind of support you will supply<onsite/remote
etc -



On 9/17/10, James Mutuku <listmutuku@gmail.com> wrote:
> I have had the same challenge. People talk of about 10% of the project cost
> yearly maintenance.  I know some companies that charge 17% of project cost
> yearly.
>
> The challenge has been how does one charge for maintenance of open source
> products? 10% of project costs(free+installation charges)
>
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